快速在第三方机器上部署buildroot生成的工具链的QT交叉编译环境

为了在其他机器上更方便的配置buildroot生成的交叉编译器的环境（特别是QT），在此提供了一种简单的方法

原理就是直接修改host目录中相关文件的路径为当前目录

1. 拷贝buildroot编译生成的host目录至目标主机

2. 将relocate_sdk.sh置于host目录，执行且仅需执行一次relocate_sdk.sh
   

3. 后续使用只需执行source environment-setup 后即可直接使用

relocate_sdk.sh

qmake -query QT_HOST_PREFIX是为了获取默认安装路径，如果编译出来的工具链里没有Qt相关库，则需要自己修改为对应路径或命令

#!/bin/bash
source environment-setup

OLD_PATH=`qmake -query QT_HOST_PREFIX`
NEW_PATH=$PWD
echo "${OLD_PATH} ---> ${NEW_PATH}"

echo "Setting it up..."
FILELIST=`grep -rwI "$OLD_PATH" $1 | awk -F":" '{ print $1 }'`

for name in $FILELIST
do
	echo -n "."
	sed -i "s%${OLD_PATH}%${NEW_PATH}%g" $name
done

echo "Done"

environment-setup 是host目录中的脚本文件

cat <<'EOF'
 _           _ _     _                 _
| |__  _   _(_) | __| |_ __ ___   ___ | |_
| '_ \| | | | | |/ _` | '__/ _ \ / _ \| __|
| |_) | |_| | | | (_| | | | (_) | (_) | |_
|_.__/ \__,_|_|_|\__,_|_|  \___/ \___/ \__|

       Making embedded Linux easy!

Some tips:
* PATH now contains the SDK utilities
* Standard autotools variables (CC, LD, CFLAGS) are exported
* Kernel compilation variables (ARCH, CROSS_COMPILE, KERNELDIR) are exported
* To configure do "./configure $CONFIGURE_FLAGS" or use
  the "configure" alias
* To build CMake-based projects, use the "cmake" alias

EOF
if [ x"$BASH_VERSION" != x"" ] ; then
	SDK_PATH=$(dirname $(realpath "${BASH_SOURCE[0]}"))
elif [ x"$ZSH_VERSION" != x"" ] ; then
	SDK_PATH=$(dirname $(realpath $0))
else
	echo "unsupported shell"
fi
export "AR=aarch64-buildroot-linux-gnu-ar"
export "AS=aarch64-buildroot-linux-gnu-as"
export "LD=aarch64-buildroot-linux-gnu-ld"
export "NM=aarch64-buildroot-linux-gnu-nm"
export "CC=aarch64-buildroot-linux-gnu-gcc"
export "GCC=aarch64-buildroot-linux-gnu-gcc"
export "CPP=aarch64-buildroot-linux-gnu-cpp"
export "CXX=aarch64-buildroot-linux-gnu-g++"
export "FC=aarch64-buildroot-linux-gnu-gfortran"
export "F77=aarch64-buildroot-linux-gnu-gfortran"
export "RANLIB=aarch64-buildroot-linux-gnu-ranlib"
export "READELF=aarch64-buildroot-linux-gnu-readelf"
export "STRIP=aarch64-buildroot-linux-gnu-strip"
export "OBJCOPY=aarch64-buildroot-linux-gnu-objcopy"
export "OBJDUMP=aarch64-buildroot-linux-gnu-objdump"
export "AR_FOR_BUILD=/usr/bin/ar"
export "AS_FOR_BUILD=/usr/bin/as"
export "CC_FOR_BUILD=ccache /usr/bin/gcc"
export "GCC_FOR_BUILD=ccache /usr/bin/gcc"
export "CXX_FOR_BUILD=ccache /usr/bin/g++"
export "LD_FOR_BUILD=/usr/bin/ld"
export "CPPFLAGS_FOR_BUILD=-I$SDK_PATH/include"
export "CFLAGS_FOR_BUILD=-O2 -I$SDK_PATH/include"
export "CXXFLAGS_FOR_BUILD=-O2 -I$SDK_PATH/include"
export "LDFLAGS_FOR_BUILD=-L$SDK_PATH/lib -Wl,-rpath,$SDK_PATH/lib"
export "FCFLAGS_FOR_BUILD="
export "DEFAULT_ASSEMBLER=aarch64-buildroot-linux-gnu-as"
export "DEFAULT_LINKER=aarch64-buildroot-linux-gnu-ld"
export "CPPFLAGS=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64"
export "CFLAGS=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=1"
export "CXXFLAGS=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=1"
export "LDFLAGS="
export "FCFLAGS= -Os -g0"
export "FFLAGS= -Os -g0"
export "PKG_CONFIG=pkg-config"
export "STAGING_DIR=$SDK_PATH/aarch64-buildroot-linux-gnu/sysroot"
export "INTLTOOL_PERL=/usr/bin/perl"
export "ARCH=arm64"
export "CROSS_COMPILE=aarch64-buildroot-linux-gnu-"
export "CONFIGURE_FLAGS=--target=aarch64-buildroot-linux-gnu --host=aarch64-buildroot-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --localstatedir=/var --program-prefix="
alias configure="./configure ${CONFIGURE_FLAGS}"
alias cmake="cmake -DCMAKE_TOOLCHAIN_FILE=$SDK_PATH/share/buildroot/toolchainfile.cmake -DCMAKE_INSTALL_PREFIX=/usr"
export "PATH=$SDK_PATH/bin:$SDK_PATH/sbin:$PATH"