Intel(R) Compiler includes compiler options that optimize for instruction
sets that are available in both Intel(R) and non-Intel microprocessors, but
may perform additional optimizations for Intel microprocessors than for
non-Intel microprocessors. In addition, certain compiler options for
Intel(R) Compiler are reserved for Intel microprocessors. For a detailed
description of these compiler options, including the instructions they
implicate, please refer to "Intel(R) Compiler User and Reference Guides >
Compiler Options."
usage: ifort [options] file1 [file2 ...]
where options represents zero or more compiler options
fileN is a Fortran source (.f .for .ftn .f90 .fpp .F .FOR .F90 .i .i90),
assembly (.s .S), object (.o), static library (.a), or other
linkable file
Commonly used options may be placed in the ifort .cfg file.
Compiler Option List
--------------------
Optimization
------------
-O1 optimize for maximum speed, but disable some optimizations which
increase code size for a small speed benefit
-O2 optimize for maximum speed (DEFAULT)
-O3 optimize for maximum speed and enable more aggressive optimizations
that may not improve performance on some programs
-O same as -O2
-Os enable speed optimizations, but disable some optimizations which
increase code size for small speed benefit
-O0 disable optimizations
-fast enable -xHOST -O3 -ipo -no-prec-div -static
options set by -fast cannot be overridden with the exception of
-xHOST, list options separately to change behavior
-Ofast enable -O3 -no-prec-div optimizations
-fno-alias
assume no aliasing in program
-fno-fnalias
assume no aliasing within functions, but assume aliasing across calls
-nolib-inline
disable inline expansion of intrinsic functions
Code Generation
---------------
-x<code> generate specialized code to run exclusively on processors
indicated by <code> as described below
SSE2 May generate Intel(R) SSE2 and SSE instructions for Intel
processors. Optimizes for the Intel NetBurst(R)
microarchitecture.
SSE3 May generate Intel(R) SSE3, SSE2, and SSE instructions for
Intel processors. Optimizes for the enhanced Pentium(R) M
processor microarchitecture and Intel NetBurst(R)
microarchitecture.
SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2, and SSE
instructions for Intel processors. Optimizes for the
Intel(R) Core(TM) microarchitecture.
SSE4.1 May generate Intel(R) SSE4 Vectorizing Compiler and Media
Accelerator instructions for Intel processors. May
generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions
and it may optimize for Intel(R) 45nm Hi-k next generation
Intel Core(TM) microarchitecture.
SSE4.2 May generate Intel(R) SSE4 Efficient Accelerated String
and Text Processing instructions supported by Intel(R)
Core(TM) i7 processors. May generate Intel(R) SSE4
Vectorizing Compiler and Media Accelerator, Intel(R) SSSE3,
SSE3, SSE2, and SSE instructions and it may optimize for
the Intel(R) Core(TM) processor family.
AVX May generate Intel(R) Advanced Vector Extensions (Intel(R)
AVX), Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3,
SSE2, and SSE instructions for Intel(R) processors.
Optimizes for a future Intel processor.
CORE-AVX2
May generate Intel(R) Advanced Vector Extensions 2
(Intel(R) AVX2), Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3,
SSE2, and SSE instructions for Intel(R) processors.
Optimizes for a future Intel processor.
CORE-AVX-I
May generate Intel(R) Advanced Vector Extensions (Intel(R)
AVX), including instructions in Intel(R) Core 2(TM)
processors in process technology smaller than 32nm,
Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE
instructions for Intel(R) processors. Optimizes for a
future Intel processor.
SSSE3_ATOM
May generate MOVBE instructions for Intel processors,
depending on the setting of option -minstruction.
May also generate Intel(R) SSSE3, SSE3, SSE2, and SSE
instructions for Intel processors. Optimizes for the
Intel(R) Atom(TM) processor and Intel(R) Centrino(R)
Atom(TM) Processor Technology.
-xHost generate instructions for the highest instruction set and processor
available on the compilation host machine
-ax<code1>[,<code2>,...]
generate code specialized for processors specified by <codes>
while also generating generic IA-32 instructions.
<codes> includes one or more of the following:
SSE2 May generate Intel(R) SSE2 and SSE instructions for Intel
processors.
SSE3 May generate Intel(R) SSE3, SSE2, and SSE instructions for
Intel processors.
SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2, and SSE
instructions for Intel processors.
SSE4.1 May generate Intel(R) SSE4.1, SSSE3, SSE3, SSE2, and SSE
instructions for Intel processors.
SSE4.2 May generate Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2,
and SSE instructions for Intel processors.
AVX May generate Intel(R) Advanced Vector Extensions (Intel(R)
AVX), Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3,
SSE2, and SSE instructions for Intel(R) processors.
CORE-AVX2
May generate Intel(R) Advanced Vector Extensions 2
(Intel(R) AVX2), Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3,
SSE2, and SSE instructions for Intel(R) processors.
CORE-AVX-I
May generate Intel(R) Advanced Vector Extensions (Intel(R)
AVX), including instructions in Intel(R) Core 2(TM)
processors in process technology smaller than 32nm,
Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE
instructions for Intel(R) processors.
-arch <code>
generate specialized code to optimize for processors indicated by
<code> as described below
SSE2 May generate Intel(R) SSE2 and SSE instructions
SSE3 May generate Intel(R) SSE3, SSE2 and SSE instructions
SSSE3 May generate Intel(R) SSSE3, SSE3, SSE2 and SSE
instructions
SSE4.1 May generate Intel(R) SSE4.1, SSSE3, SSE3, SSE2 and SSE
instructions
SSE4.2 May generate Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and
SSE instructions
AVX May generate Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3,
SSE2 and SSE instructions
IA32 generate x86/x87 generic code that is compatible with IA-32
architecture. Disables any default extended instruction
settings and any previously set extended instruction
settings.
SSE same as /arch:IA32
-mcpu=<cpu>
same as -mtune=<cpu>
-mtune=<cpu>
optimize for a specific <cpu>
pentium3 - optimize for Pentium(R) III processors
pentium4 - optimize for Pentium(R) 4 processor (DEFAULT)
-march=<cpu>
generate code exclusively for a given <cpu>
pentium3 - streaming SIMD extensions
pentium4 - Pentium(R) 4 New Instructions
-mia32 generates code which will run on any Intel Pentium or later
processor. Disables any default extended instruction settings, and
any previously set extended instruction settings.
-msse deprecated. Use -mia32 instead.
-msse2 May generate Intel(R) SSE2 and SSE instructions
-msse3 May generate Intel(R) SSE3, SSE2, and SSE instructions
-mssse3 May generate Intel(R) SSSE3, SSE3, SSE2, and SSE instructions
-msse4 Enable -msse4.2
-msse4.1 May generate Intel(R) SSE4.1, SSSE3, SSE3, SSE2, and SSE instructions
-msse4.2 May generate Intel(R) SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE
instructions
-mavx May generate Intel(R) AVX, SSE4.2, SSE4.1, SSSE3, SSE3, SSE2, and SSE
instructions
-masm=<dialect>
generate asm instructions specified by <dialect>, which may be
att (DEFAULT) or intel
-minstruction=<keyword>
Refine instruction set output for the selected target processor
[no]movbe - Do/do not generate MOVBE instructions with SSSE3_ATOM
(requires -xSSSE3_ATOM)
-f[no-]omit-frame-pointer
enable(DEFAULT)/disable use of EBP as general purpose register.
-fno-omit-frame-pointer replaces -fp
-f[no-]exceptions
enable/disable(DEFAULT) C++ exception handling table generation
-f[no-]exceptions
enable(DEFAULT)/disable exception handling
-fasynchronous-unwind-tables
determines whether unwind information is precise at an instruction
boundary or at a call boundary. -fno-asynchronous-unwind-tables is
the default for IA-32 architecture.
Interprocedural Optimization (IPO)
----------------------------------
-[no-]ip enable(DEFAULT)/disable single-file IP optimization
within files
-ipo[n] enable multi-file IP optimization between files
-ipo-c generate a multi-file object file (ipo_out.o)
-ipo-S generate a multi-file assembly file (ipo_out.S)
-ip-no-inlining
disable full and partial inlining
-ip-no-pinlining
disable partial inlining
-ipo-separate
create one object file for every source file (overrides -ipo[n])
-ipo-jobs<n>
specify the number of jobs to be executed simultaneously during the
IPO link phase
Advanced Optimizations
----------------------
-unroll[n]
set maximum number of times to unroll loops. Omit n to use default
heuristics. Use n=0 to disable the loop unroller
-[no-]unroll-aggressive
enables more aggressive unrolling heuristics
-funroll-loops
unroll loops based on default heuristics
-opt-args-in-regs=<keyword>
Determines whether calls to routines are optimized by passing
arguments in registers instead of on the stack.
keywords: none, seen(DEFAULT)
-[no-]scalar-rep
enable(DEFAULT)/disable scalar replacement (requires -O3)
-[no]pad enable/disable(DEFAULT) changing variable and array memory layout
-safe-cray-ptr
Cray pointers do not alias with other variables
-[no-]ansi-alias
enable/disable(DEFAULT) use of ANSI aliasing rules optimizations;
user asserts that the program adheres to these rules
-[no-]complex-limited-range
enable/disable(DEFAULT) the use of the basic algebraic expansions of
some complex arithmetic operations. This can allow for some
performance improvement in programs which use a lot of complex
arithmetic at the loss of some exponent range.
-reentrancy <keyword>
specify whether the threaded, reentrant run-time support should be
used
Keywords: none (same as -noreentrancy), threaded, async
-noreentrancy
do not use threaded, reentrant run-time support
-heap-arrays [n]
temporary arrays of minimum size n (in kilobytes) are allocated in
heap memory rather than on the stack. If n is not specified,
all temporary arrays are allocated in heap memory.
-no-heap-arrays
temporary arrays are allocated on the stack (DEFAULT)
-[no-]opt-multi-version-aggressive
enables more aggressive multi-versioning to check for pointer
aliasing and scalar replacement
-opt-ra-region-strategy[=<keyword>]
select the method that the register allocator uses to partition each
routine into regions
routine - one region per routine
block - one region per block
trace - one region per trace
loop - one region per loop
default - compiler selects best option
-[no-]vec
enables(DEFAULT)/disables vectorization
-[no-]vec-guard-write
enables cache/bandwidth optimization for stores under conditionals
within vector loops
-vec-threshold[n]
sets a threshold for the vectorization of loops based on the
probability of profitable execution of the vectorized loop in
parallel
-opt-malloc-options={0|1|2|3|4}
specify malloc configuration parameters. Specifying a non-zero <n>
value will cause alternate configuration parameters to be set for
how malloc allocates and frees memory
-opt-jump-tables=<arg>
control the generation of jump tables
default - let the compiler decide when a jump table, a series of
if-then-else constructs or a combination is generated
large - generate jump tables up to a certain pre-defined size
(64K entries)
<n> - generate jump tables up to <n> in size
use -no-opt-jump-tables to lower switch statements as chains of
if-then-else constructs
-fno-jump-tables
do not generate jump tables for switches and if-then-else statements
-opt-block-factor=<n>
specify blocking factor for loop blocking
-opt-streaming-stores <arg>
specifies whether streaming stores are generated
always - enables generation of streaming stores under the
assumption that the application is memory bound
auto - compiler decides when streaming stores are used (DEFAULT)
never - disables generation of streaming stores
-mkl[=<arg>]
link to the Intel(R) Math Kernel Library (Intel(R) MKL) and bring
in the associated headers
parallel - link using the threaded Intel(R) MKL libraries. This
is the default when -mkl is specified
sequential - link using the non-threaded Intel(R) MKL libraries
cluster - link using the Intel(R) MKL Cluster libraries plus
the sequential Intel(R) MKL libraries
-[no-]opt-subscript-in-range
assumes no overflows in the intermediate computation of the
subscripts
-coarray[=shared|distributed]
enable/disable(DEFAULT) coarray syntax for data parallel
programming. The default is shared-memory; distributed
memory is only valid with the Intel(R) Cluster Toolkit
-coarray-num-images=n
set default number of coarray images
-[no-]opt-matmul
replace matrix multiplication with calls to intrinsics and threading
libraries for improved performance (DEFAULT at -O3 -parallel)
-[no-]simd
enables(DEFAULT)/disables vectorization using SIMD directive
-guide-opts=<arg>
tells the compiler to analyze certain code and generate
recommendations that may improve optimizations
-guide-file[=<filename>]
causes the results of guided auto-parallelization to be output to a
file
-guide-file-append[=<filename>]
causes the results of guided auto-parallelization to be appended to
a file
-guide[=<level>]
lets you set a level (1 - 4) of guidance for auto-vectorization,
auto-parallelization, and data transformation (DEFAULT is 4 when the
option is specified)
-guide-data-trans[=<level>]
lets you set a level (1 - 4) of guidance for data transformation
(DEFAULT is 4 when the option is specified)
-guide-par[=<level>]
lets you set a level (1 - 4) of guidance for auto-parallelization
(DEFAULT is 4 when the option is specified)
-guide-vec[=<level>]
lets you set a level (1 - 4) of guidance for auto-vectorization
(DEFAULT is 4 when the option is specified)
-opt-mem-layout-trans[=<level>]
controls the level of memory layout transformations performed by the
compiler
0 - disable memory layout transformations (same as
-no-opt-mem-layout-trans)
1 - enable basic memory layout transformations
2 - enable more memory layout transformations (DEFAULT when the
option is specified)
3 - enable aggressive memory layout transformations
Profile Guided Optimization (PGO)
---------------------------------
-prof-dir <dir>
specify directory for profiling output files (*.dyn and *.dpi)
-prof-src-root <dir>
specify project root directory for application source files to
enable relative path resolution during profile feedback on sources
below that directory
-prof-src-root-cwd
specify the current directory as the project root directory for
application source files to enable relative path resolution during
profile feedback on sources below that directory
-[no-]prof-src-dir
specify whether directory names of sources should be
considered when looking up profile records within the .dpi file
-prof-file <file>
specify file name for profiling summary file
-[no-]prof-data-order
enable/disable(DEFAULT) static data ordering with profiling
-[no-]prof-func-order
enable/disable(DEFAULT) function ordering with profiling
-[no-]prof-func-groups
enable(DEFAULT with PGO)/disable function grouping
-prof-gen[=keyword]
instrument program for profiling.
Optional keyword may be srcpos or globdata
-no-prof-gen
disable profiling instrumentation
-prof-use[=<arg>]
enable use of profiling information during optimization
weighted - invokes profmerge with -weighted option to scale data
based on run durations
[no]merge - enable(default)/disable the invocation of the profmerge
tool
-no-prof-use
disable use of profiling information during optimization
-opt-prefetch[=n]
enable levels of prefetch insertion, where 0 disables.
n may be 0 through 4 inclusive. Default is 2.
-no-opt-prefetch
disable(DEFAULT) prefetch insertion. Equivalent to -opt-prefetch=0
-p compile and link for function profiling with UNIX gprof tool
On IA32 and Intel(r)64, -pg is also valid
-f[no-]instrument-functions
determine whether function entry and exit points are instrumented
-prof-hotness-threshold=<val>
set the hotness threshold for function grouping and function ordering
val indicates percentage of functions to be placed in hot region.
This option requires -prof-use
and -prof-func-groups or -prof-func-order
-prof-value-profiling=<arg>[,<arg>,...]
limit value profiling
none - inhibit all types of value profiling
nodivide - inhibit value profiling of non-compile time constants
used in division or remainder operations
noindcall - inhibit value profiling of function addresses at
indirect call sites
-profile-functions
enable instrumentation in generated code for collecting
function execution time profiles
-profile-loops:<arg>
enable instrumentation in generated code for collecting
loop execution time profiles
inner - instrument inner loops
outer - instrument outer loops
all - instrument all loops
-profile-loops-report:<arg>
Control the level of instrumentation inserted for reporting loop
execution profiles
1 - report loop times
2 - report loop times and iteration counts
Optimization Reports
--------------------
-vec-report[n]
control amount of vectorizer diagnostic information
n=0 no diagnostic information
n=1 indicate vectorized loops (DEFAULT when enabled)
n=2 indicate vectorized/non-vectorized loops
n=3 indicate vectorized/non-vectorized loops and prohibiting
data dependence information
n=4 indicate non-vectorized loops
n=5 indicate non-vectorized loops and prohibiting data
dependence information
-opt-report [n]
generate an optimization report to stderr
0 disable optimization report output
1 minimum report output
2 medium output (DEFAULT when enabled)
3 maximum report output
-opt-report-file=<file>
specify the filename for the generated report
-opt-report-phase=<phase>
specify the phase that reports are generated against
-opt-report-routine=<name>
reports on routines containing the given name
-opt-report-help
display the optimization phases available for reporting
-tcheck [mode]
enable analysis of threaded applications (requires Intel(R) Thread
Checker; cannot be used with compiler alone)
tci - instruments a program to perform a thread-count-independent
analysis
tcd - instruments a program to perform a thread-count-dependent
analysis (DEFAULT when mode is not used)
api - instruments a program at the api-imports level
-tcollect[=<lib>]
inserts instrumentation probes calling the Intel(R) Trace Collector
API. The library -l<lib> is linked in the default being -lVT
(requires Intel(R) Trace Collector)
-tcollect-filter file
Enable or disable the instrumentation of specified functions.
(requires Intel(R) Trace Collector)
OpenMP* and Parallel Processing
------------------------------
-openmp enable the compiler to generate multi-threaded code based on the
OpenMP* directives (same as -fopenmp)
-openmp-stubs
enables the user to compile OpenMP programs in sequential mode. The
OpenMP directives are ignored and a stub OpenMP library is linked
(sequential)
-openmp-report{0|1|2}
control the OpenMP parallelizer diagnostic level
-openmp-lib <ver>
choose which OpenMP library version to link with
compat - use the GNU compatible OpenMP run-time libraries
(DEFAULT)
-openmp-threadprivate <ver>
choose which threadprivate implementation to use
compat - use the GNU compatible thread local storage
legacy - use the Intel compatible implementation
(DEFAULT)
-parallel
enable the auto-parallelizer to generate multi-threaded code for
loops that can be safely executed in parallel
-par-report{0|1|2|3}
control the auto-parallelizer diagnostic level
-par-threshold[n]
set threshold for the auto-parallelization of loops where n is an
integer from 0 to 100
-par-runtime-control[n]
Control parallelizer to generate runtime check code for effective
automatic parallelization.
n=0 no runtime check based auto-parallelization
n=1 generate runtime check code under conservative mode
(DEFAULT when enabled)
n=2 generate runtime check code under heuristic mode
n=3 generate runtime check code under aggressive mode
-par-schedule-static[=n]
Specifies a scheduling algorithm for DO loop iteration.
Divides iterations into contiguous pieces. Size n if
specified, equal sized pieces if not.
-par-schedule-static_balanced[=n]
Divides iterations into even-sized chunks. Size n if
specified, equal sized pieces if not.
-par-schedule-static-steal[=n]
Divides iterations into even-sized chunks, but allows
threads to steal parts of chunks from neighboring threads
-par-schedule-dynamic[=n]
Specifies a scheduling algorithm for DO loop iteration.
Assigns iterations to threads in chunks dynamically.
Chunk size is n iterations if specified, otherwise 1.
-par-schedule-guided[=n]
Specifies a scheduling algorithm for DO loop iteration.
Indicates a minimum number of iterations. If specified,
n is the minimum number, otherwise 1.
-par-schedule-guided-analytical[=n]
Divides iterations by using exponential distribution or
dynamic distributions.
-par-schedule-runtime
Specifies a scheduling algorithm for DO loop iteration.
Defers the scheduling decision until runtime.
-par-schedule-auto
Lets the compiler or run-time system determine the
scheduling algorithm.
-par-affinity=[<modifier>,...]<type>[,<permute>][,<offset>]
tune application performance by setting different thread affinity
-par-num-threads=<n>
tune application performance by setting different number of threads
-parallel-source-info[=n]
enable(DEFAULT)/disable the emission of source location information
for parallel code generation with OpenMP and auto-parallelization
0 - disable (same as -no-parallel-source-info)
1 - emit routine name and line information (DEFAULT)
2 - emit path, file, routine name and line information
Floating Point
--------------
-fp-model <name>
enable <name> floating point model variation
[no-]except - enable/disable floating point semantics
fast[=1|2] - enables more aggressive floating point optimizations
precise - allows value-safe optimizations
source - enables intermediates in source precision
strict - enables -fp-model precise -fp-model except, disables
contractions and enables pragma stdc fenv_access
-fp-speculation=<mode>
enable floating point speculations with the following <mode>
conditions:
fast - speculate floating point operations (DEFAULT)
safe - speculate only when safe
strict - same as off
off - disables speculation of floating-point operations
-pc32 set internal FPU precision to 24 bit significand
-pc64 set internal FPU precision to 53 bit significand (DEFAULT)
-pc80 set internal FPU precision to 64 bit significand
-mp1 improve floating-point precision (speed impact less than -mp)
-mieee-fp
same as -mp, can be disabled with -mno-ieee-fp
-[no-]prec-sqrt
determine if certain square root optimizations are enabled
-[no-]prec-div
improve precision of FP divides (some speed impact)
-[no-]fast-transcendentals
generate a faster version of the transcendental functions
-[no-]fp-port
round fp results at assignments and casts (some speed impact)
-fp-stack-check
enable fp stack checking after every function/procedure call
-rcd rounding mode to enable fast float-to-int conversions
-rounding-mode chopped
set internal FPU rounding control to truncate
-[no-]ftz
enable/disable flush denormal results to zero
-fpe{0|1|3}
specifies program-wide behavior on floating point exceptions
-fpe-all={0|1|3}
specifies floating point exception behavior on all functions
and subroutines. Also sets -assume ieee_fpe_flags
-[no]fltconsistency
specify that improved floating-point consistency should be used
-[no-]fma
enable/disable the combining of floating point multiplies and
add/subtract operations
-[no]recursive
compile all procedures for possible recursive execution
Inlining
--------
-inline-level=<n>
control inline expansion:
n=0 disable inlining
n=1 inline functions declared with ATTRIBUTES INLINE or
FORCEINLINE
n=2 inline any function, at the compiler's discretion
-f[no-]inline-functions
inline any function at the compiler's discretion
-finline-limit=<n>
set maximum number of statements a function can have and still be
considered for inlining
-inline-min-size=<n>
set size limit for inlining small routines
-no-inline-min-size
no size limit for inlining small routines
-inline-max-size=<n>
set size limit for inlining large routines
-no-inline-max-size
no size limit for inlining large routines
-inline-max-total-size=<n>
maximum increase in size for inline function expansion
-no-inline-max-total-size
no size limit for inline function expansion
-inline-max-per-routine=<n>
maximum number of inline instances in any function
-no-inline-max-per-routine
no maximum number of inline instances in any function
-inline-max-per-compile=<n>
maximum number of inline instances in the current compilation
-no-inline-max-per-compile
no maximum number of inline instances in the current compilation
-inline-factor=<n>
set inlining upper limits by n percentage
-no-inline-factor
do not set set inlining upper limits
-inline-forceinline
treat inline routines as forceinline
-inline-calloc
directs the compiler to inline calloc() calls as malloc()/memset()
Output, Debug, PCH
------------------
-c compile to object (.o) only, do not link
-S compile to assembly (.s) only, do not link
-fsource-asm
produce assembly file with optional source annotations (requires -S)
-f[no-]verbose-asm
produce assembly file with compiler comments (DEFAULT) (requires -S)
-fcode-asm
produce assembly file with optional code annotations (requires -S)
-use-msasm
support Microsoft* style assembly language insertion using MASM style
syntax
-Fa[file]
name assembly file (or directory for multiple files; i.e. /FaMYDIR)
-Fo[file]
name object file (or directory for multiple files; i.e. /FoMYDIR)
-o <file>
name output file
-list [<filename>]
specify that a listing file should be generated
-list-line-len=#
overrides the default line length (80) in a listing file
-list-page-len=#
overrides the default page length (66) in a listing file
-show <keyword>
controls the contents of the listing file
keywords: all, none, [no]include, [no]map, [no]options
-g produce symbolic debug information in object file (implies -O0 when
another optimization option is not explicitly set)
-debug [keyword]
enable debug information and control output of enhanced debug
information
keywords: all, full, minimal, none, [no]inline-debug-info
[no]variable-locations, [no]semantic-stepping,
extended
parallel
-debug-parameters [keyword]
control output of debug information for PARAMETERS
keywords: all, used, none (same as -nodebug-parameters)
-nodebug-parameters
do not output debug information for PARAMETERS
-fvar-tracking
same as -debug variable_locations
-fvar-tracking-assignments
same as -debug semantic_stepping
-g0 disable generation of symbolic debug information
-gdwarf-2
enable generation of debug information using the DWARF2 format
-gdwarf-3
enable generation of debug information using the DWARF3 format
-fno-merge-debug-strings
do not merge identical debug strings in different object files
-[no]d-lines
compile debug statements (indicated by D in column 1)
-DD compile debug statements, indicated by D in column 1. This option
prevents the definition of a macro named D using the command line
-Dname option (use -Dname=n syntax instead)
-ftrapuv trap uninitialized variables
-map-opts
enable option mapping tool
-print-multi-lib
print information about libraries being used
Preprocessor
------------
-D<name>[=<text>]
define macro
-nodefines, -noD
specifies that any -D macros go to the preprocessor only, and not to
the compiler
-U<name> remove predefined macro
-allow nofpp-comments
If a Fortran end-of-line comment is seen within a #define, treat it
as part of the definition. Default is allow:fpp-comments
-E preprocess to stdout
-EP preprocess to stdout, omitting #line directives
-P preprocess to file, omitting #line directives
-preprocess-only
same as -P
-[no]keep keep/remove preprocessed file generated by preprocessor as input to
compiler stage. Not affected by -save-temps. Default is -nokeep
-fpp[n], -[no]fpp
run Fortran preprocessor on source files prior to compilation
n=0 disable running the preprocessor, equivalent to nofpp
n=1,2,3 run preprocessor
-module path
specify path where mod files should be placed and first location to
look for mod files
-I<dir> add directory to include file search path
-idirafter<dir>
add directory to the second include file search path (after -I)
-isystem<dir>
add directory to the start of the system include path
-X, -nostdinc
remove standard directories from include file search path
-B<prefix>
find libraries, headers and executables in <prefix>
-[no]gen-dep[=filename]
generate dependency information. If no filename is specified,
output to stdout
-gen-depformat=keyword
generate dependency information in the specified format.
One of: make, nmake
Component Control
-----------------
-Qoption,<tool>,<opts>
pass options <opts> to tool specified by <tool>
-Qlocation,<tool>,<dir>
set <dir> as the location of tool specified by <tool>
-Qinstall <dir>
set <dir> as root of compiler installation
Language
--------
-[no]altparam
specify if alternate form of parameter constant declarations
(without parenthesis) is recognized. Default is to recognize
-assume <keyword>
specify assumptions made by the optimizer and code generator
keywords: none, [no]byterecl, [no]buffered_io,
[no]bscc (nobscc same as -nbs),
[no]cc_omp, [no]minus0,
[no]dummy_aliases (same as -common-args),
[no]ieee_fpe_flags, [no]fpe_summary,
[no]old_boz, [no]old_logical_ldio,
[no]old_ldout_format, [no]old_maxminloc,
[no]old_unit_star, [no]old_xor,
[no]protect_constants, [no]protect_parens,
[no]realloc_lhs, [no]2underscore,
[no]underscore (same as -us),
[no]std_mod_proc_name, [no]source_include,
[no]split_common,[no]writeable_strings
-ccdefault <keyword>
specify default carriage control for units 6 and *
keywords: default, fortran, list or none
-[no]check <keyword>
check run-time conditions. Default is -nocheck
keywords: all (same as -C), none (same as -nocheck),
[no]arg_temp_created, [no]bounds (same as -CB),
[no]format, [no]output_conversion,
[no]pointer (same as -CA),
[no]uninit (same as -CU)
-common-args
assume "by reference" subprogram arguments may alias one
another. Same as -assume dummy_aliases
-e03 issue errors for language elements that are not standard in
Fortran 2003 (same as -stand f03 -warn stderrors options)
-e95 issue errors for language elements that are not standard in
Fortran 95 (same as -stand f95 -warn stderrors options)
-e90 issue errors for language elements that are not standard in
Fortran 90 (same as -stand f90 -warn stderrors options)
-[no]extend-source [<keyword>]
specify rightmost column for fixed form sources
keywords: 72 (same as -noextend-source and -72),
80 (same as -80),
132 (same as -132. Default if you specify
-extend-source without a keyword.)
-fixed specify source files are in fixed format. Same as -FI
-nofixed indicates free format
-free specify source files are in free format. Same as -FR
-nofree indicates fixed format
-[no]mixed-str-len-arg
indicate whether hidden lengths are passed after their
character argument or after all arguments.
-names <keyword>
specify how source code identifiers and external names are
interpreted.
keywords: as_is, lowercase, uppercase
-[no]pad-source
make compiler acknowledge blanks at the end of a line
-stand [<keyword>]
specifies level of conformance with ANSI standard to check
for. If keyword is not specified, level of conformance is f03
keywords: f90 (same as -std90), f95(same as -std95),
f03(same as -std95), none (same as -nostand)
-standard-semantics
sets assume keywords to conform to the semantics of the f03
standard. May result in performance loss.
assume keywords set by -standard-semantics:
byterecl, fpe_summary, minus0, noold_maxminloc,
noold_unit_star, noold_xor, protect_parens, realloc_lhs,
std_mod_proc_name, noold_ldout_format
-syntax-only
perform syntax and semantic checking only (no object file produced)
Compiler Diagnostics
--------------------
-w disable all warnings
-W<n> disable warnings (n = 0) or show warnings (n = 1 DEFAULT, same as
-warn general)
-warn <keyword>
specifies the level of warning messages issued
keywords: all, none (same as -nowarn)
[no]alignments, [no]declarations, [no]errors,
[no]general, [no]ignore_loc, [no]interfaces,
[no]stderrors, [no]truncated_source, [no]uncalled,
[no]unused, [no]usage
-nowarn suppress all warning messages
-WB turn a compile-time bounds check into a warning
-Winline enable inline diagnostics
-[no]traceback
specify whether the compiler generates PC correlation data used to
display a symbolic traceback rather than a hexadecimal traceback at
runtime failure
-[no]gen-interfaces[:[no]source]
generate interface blocks for all routines in the file. Can be
checked using -warn interfaces
nosource indicates temporary source files should not be saved
-error-limit <size>
specify the maximum number of error-level or fatal-level compiler
errors allowed
-noerror-limit
set no maximum number on error-level or fatal-level error messages
-diag-enable <v1>[,<v2>,...]
enable the specified diagnostics or diagnostic groups
-diag-disable <v1>[,<v2>,...]
disable the specified diagnostics or diagnostic groups
where <vN> may be individual diagnostic numbers or group names.
where group names include:
sc[n] - perform source code analysis: n=1 for critical
errors, n=2 for all errors and n=3 for all errors
and warnings
sc-include - perform source code analysis on include files
sc-parallel[n] - perform analysis of parallelization in
source code: n=1 for critical errors,
n=2 for errors, n=3 for all errors and
warnings
warn - diagnostic messages that have "warning" severity level.
error - diagnostic messages that have "error" severity level.
remark - diagnostic messages that are remarks or comments.
vec - diagnostic messages issued by the vectorizer.
par - diagnostic messages issued by the auto-parallelizer
openmp - diagnostic messages issued by the OpenMP* parallelizer.
cpu-dispatch Specifies the CPU dispatch remarks.
-diag-error <v1>[,<v2>,...]
output the specified diagnostics or diagnostic groups as errors
-diag-warning <v1>[,<v2>,...]
output the specified diagnostics or diagnostic groups as warnings
-diag-remark <v1>[,<v2>,...]
output the the specified diagnostics or diagnostic groups as remarks
-diag-dump
display the currently enabled diagnostic messages to stdout or to a
specified diagnostic output file.
-diag-sc-dir=<dir>
<dir> directory where diagnostics from Static security analysis are
created, rather than current working directory.
-diag-file[=<file>]
<file> where diagnostics are emitted to. Not specifying this causes
messages to be output to stderr
-diag-file-append[=<file>]
<file> where diagnostics are emitted to. When <file> already exists,
output is appended to the file
-[no-]diag-id-numbers
enable(DEFAULT)/disable the diagnostic specifiers to be output in
numeric form
-diag-error-limit <num>
specify the maximum number of errors emitted
Miscellaneous
-------------
-[no]logo
display compiler version information. /nologo disables the output
-V display compiler version information
-dumpmachine
display the target machine only
--version
display GCC style version information
-sox[=<keyword>[,keyword]]
enable saving of compiler options, version and additional information
in the executable. Use -no-sox to disable(DEFAULT)
profile - include profiling data
inline - include inlining information
-save-temps
store the intermediate files in current directory and name them
based on the source file. Only saves files that are generated by
default
-dryrun show driver tool commands but do not execute tools
-v show driver tool commands and execute tools
-what display detailed compiler version information
-watch <keyword>
tells the driver to output processing information
keywords: all, none (same as -nowatch), [no]source,
[no]cmd (same as -v)
-nowatch suppress processing information output (DEFAULT)
-Tf<file>
compile file as Fortran source
-multiple-processes[=<n>]
create multiple processes that can be used to compile large numbers
of source files at the same time
Data
----
-i{2|4|8}
set default KIND of integer and logical variables to 2, 4, or 8
-integer-size <size>
specifies the default size of integer and logical variables
size: 16, 32, 64
-r{8|16} set default size of real to 8 or 16 bytes
-real-size <size>
specify the size of REAL and COMPLEX declarations, constants,
functions, and intrinsics
size: 32, 64, 128
-autodouble
same as -real-size 64 or -r8
-double-size <size>
defines the size of DOUBLE PRECISION and DOUBLE COMPLEX declarations,
constants, functions, and intrinsics
size: 64, 128
-[no]fpconstant
extends the precision of single precision constants assigned to
double precision variables to double precision
-[no]intconstant
use Fortran 77 semantics, rather than Fortran 90/95, to determine
kind of integer constants
-auto make all local variables AUTOMATIC
-auto-scalar
make scalar local variables AUTOMATIC (DEFAULT)
-save save all variables (static allocation) (same as -noauto,
opposite of -auto)
-[no]zero
enable/disable(DEFAULT) implicit initialization to zero of local
scalar variables of intrinsic type INTEGER, REAL, COMPLEX, or
LOGICAL that are saved and not initialized
-dyncom<common1,common2,...>
make given common blocks dynamically-allocated
-Zp[n] specify alignment constraint for structures (n=1,2,4,8,16
-Zp16 DEFAULT)
-[no]align
analyze and reorder memory layout for variables and arrays
-align <keyword>
specify how data items are aligned
keywords: all (same as -align), none (same as -noalign),
[no]commons, [no]dcommons, [no]qcommons,
rec1byte, rec2byte, rec4byte, rec8byte, rec16byte,
[no]records, [no]sequence
-fminshared
Compilation is for the main executable. Absolute addressing can be
used and non-position independent code generated for symbols that
are at least protected
-fcommon Enables the compiler to treat common variables as if they were
defined. That in turn allows the use of gprel addressing of common
data variables. -fno-common disables
-fstack-security-check
enable overflow security checks.
-f[no-]stack-security-check disables (DEFAULT)
-fstack-protector
enable stack overflow security checks.
-f[no-]stack-protector disables (DEFAULT)
-fstack-protector-all
enable stack overflow security checks including functions.
-f[no-]stack-protector-all disables (DEFAULT)
-fpic, -fPIC
generate position independent code (-fno-pic/-fno-PIC is DEFAULT)
-fpie, -fPIE
generate position independent code that will be linked into an
executable (-fno-pie/-fno-PIE is DEFAULT)
-[no-]global-hoist
enable(DEFAULT)/disable external globals are load safe
-f[no-]keep-static-consts
enable/disable(DEFAULT) emission of static const variables even
when not referenced
-fpack-struct
pack structure members together
-f[no-]math-errno
set ERRNO after calling standard math library functions
-no-bss-init
disable placement of zero-initialized variables in BSS (use DATA)
-f[no-]zero-initialized-in-bss
put explicitly zero initialized variables into the DATA section
instead of the BSS section
-convert <keyword>
specify the format of unformatted files containing numeric data
keywords: big_endian, cray, ibm, little_endian, native, vaxd, vaxg
-falign-functions=[2|16]
align the start of functions on a 2 (DEFAULT) or 16 byte boundary
-falign-functions
align the start of functions to an optimal machine-dependent value.
-fno-align-functions (DEFAULT) aligns on a 2-byte boundary
-falign-stack=<mode>
stack alignment method to use on entry to routines
maintain-16-byte - do not assume any specific alignment, but
maintain alignment in case the stack is already
aligned
assume-16-byte - assume the stack is aligned on 16-byte
boundaries (default)
assume-4-byte - assume the stack is aligned on 4-byte
boundaries
-fvisibility=[extern|default|protected|hidden|internal]
Global symbols (data and functions) will get the visibility
attribute given by default. Symbol visibility attributes explicitly
set in the source code or using the symbol visibility attribute
file options will override the -fvisibility setting
-fvisibility-extern=<file>
Space separated symbols listed in the <file> argument will get
visibility set to extern
-fvisibility-default=<file>
Space separated symbols listed in the <file> argument will get
visibility set to default
-fvisibility-protected=<file>
Space separated symbols listed in the <file> argument will get
visibility set to protected
-fvisibility-hidden=<file>
Space separated symbols listed in the <file> argument will get
visibility set to hidden
-fvisibility-internal=<file>
Space separated symbols listed in the <file> argument will get
visibility set to internal
-fvisibility-inlines-hidden
mark inline member functions as hidden
-fimf-absolute-error=value[:funclist]
define the maximum allowable absolute error for math library
function results
-fimf-accuracy-bits=bits[:funclist]
define the relative error, measured by the number of correct bits,
for math library function results
-fimf-arch-consistency=value[:funclist]
ensures that the math library functions produce consistent results
across different implementations of the same architecture
-fimf-max-error=ulps[:funclist]
defines the maximum allowable relative error, measured in ulps, for
math library function results
-fimf-precision=value[:funclist]
defines the accuracy (precision) for math library functions
Compatibility
-------------
-fpscomp <keyword>
specify the level of compatibility to adhere to with Fortran
PowerStation
keywords: all, none (same as -nofpscomp), [no]filesfromcmd,
[no]general, [no]ioformat, [no]ldio_spacing,
[no]libs, [no]logicals
-nofpscomp
no specific level of compatibility with Fortran PowerStation
-f66, -66
allow extensions that enhance FORTRAN-66 compatibility
-f77rtl specify that the Fortran 77 specific run-time support should be used
-nof77rtl disables
-vms enable VMS I/O statement extensions
-gcc-name=<name>
name and location of gcc if not where expected
-gxx-name=<name>
name and location of g++ if not where expected
-gcc-version=<version>
specify the <version> of gcc compatibility. Default value matches
gcc version installed. Major/Minor versions listed but patch
levels (i.e. 345) are permissible
Example: -gcc-version=410 -> gcc 4.1.x compatibility
Linking/Linker
--------------
-L<dir> instruct linker to search <dir> for libraries
-l<string>
instruct the linker to link in the -l<string> library
-shared-intel
link Intel provided libraries dynamically
-static-intel
link Intel provided libraries statically
-shared-libgcc
link libgcc dynamically
-static-libgcc
link libgcc statically
-dynamic-linker<file>
select dynamic linker other than the default
-no-cxxlib
do not link in C++ runtime libraries
-cxxlib[=dir]
link using C++ run-time libraries provided with gcc dir is an
optional top-level location for the gcc binaries and libraries
-nodefaultlibs
do not use standard libraries when linking
-nostartfiles
do not use standard startup files when linking
-nostdlib
do not use standard libraries and startup files when linking
-nofor-main
do not link against Fortran main object. Used when linking Fortran
objects with C main program
-static prevents linking with shared libraries
-shared produce a shared object
-Bstatic specify following libraries are linked statically
-Bdynamic
specify following libraries are linked dynamically
-cxxlib-<mode>
tell the compiler which C++ run-time libraries to use
nostd - do not link in standard C++ library
-T <file>
direct linker to read link commands from <file>
-Xlinker <val>
pass <val> directly to the linker for processing
-Wa,<o1>[,<o2>,...]
pass options o1, o2, etc. to the assembler
-Wl,<o1>[,<o2>,...]
pass options o1, o2, etc. to the linker for processing
-Wp,<o1>[,<o2>,...]
pass options o1, o2, etc. to the preprocessor
-threads specify that multi-threaded libraries should be linked against
-nothreads disables multi-threaded libraries
Linker Specific Options
-----------------------
These options are specific to the linker. Details can be found in the linker
documentation and man page
-L<dir>
-T<arg>
-h<arg>
-u<arg>
-z<arg>
-i
-r
-s
-N
-Bsymbolic
-Bdynamic
-Bstatic
Deprecated Options
------------------
-export No replacement
-export-dir No replacement
-Ob use -inline-level=<n>
-i-dynamic use -shared-intel
-i-static use -static-intel
-inline-debug-info use -debug inline-debug-info
-mp use -fp-model <arg>
-use-asm No replacement
-prof-genx use -prof-gen=srcpos
-fwritable-strings use -assume writeable-strings
-1, -66, -onetrip use -f66
-Vaxlib No replacement
-automatic use -auto
-cm use -warn nousage
-dps use -altparam
-lowercase use -names lowercase
-uppercase use -names uppercase
-nus use -assume nounderscore
-pthread use -reentrancy threaded
-w90, -w95 No replacement
-tune use -x
-arch pn* use -arch <arg>
-openmp-profile No replacement
-tprofile No replacement
-xK use -mia32
-axK use -mia32
-xW use -msse2
-axW use -msse2
-xN use -xSSE2
-axN use -axSSE2
-xP use -xSSE3
-axP use -axSSE3
-xT use -xSSSE3
-axT use -axSSSE3
-xS use -xSSE4.1
-axS use -axSSE4.1
-xO use -msse3
-xSSE3_ATOM use -xSSSE3_ATOM
-diag-enable sv<n> use -diag-enable sc<n>
-diag-enable sv-include use -diag-enable sc-include
-diag-disable sv use -diag-disable sc
-diag-sv use -diag-enable sc
-diag-sv-error use -diag-disable warning
-diag-sv-include use -diag-enable sc-include
-diag-sv-level No replacement
-diag-sv-sup use -diag-disable <v1>[,<v2>,...]
-help [category] print full or category help message
Valid categories include
advanced - Advanced Optimizations
codegen - Code Generation
compatibility - Compatibility
component - Component Control
data - Data
deprecated - Deprecated Options
diagnostics - Compiler Diagnostics
float - Floating Point
help - Help
inline - Inlining
ipo - Interprocedural Optimization (IPO)
language - Language
link - Linking/Linker
misc - Miscellaneous
opt - Optimization
output - Output
pgo - Profile Guided Optimization (PGO)
preproc - Preprocessor
reports - Optimization Reports
openmp - OpenMP and Parallel Processing
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