交叉编译遇到bin/ld: cannot find crt1.o: No such file or directory问题解决
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交叉编译一个库在运行configure生成Makefile时遇到如下错误：
$ ./configure --host=arm-linux-gnueabihf CC=/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc --prefix=/usr/local/ncurse --without-ada --enable-termcap --with-shared
checking for arm-linux-gnueabihf-gcc... /home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc
checking for C compiler default output... configure: error: C compiler cannot create executables
很明显是GCC交叉编译工具校验不过，查看config.log文件的log信息如下：
configure:1711: checking for C compiler default output
configure:1714: /home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc conftest.c >&5
/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/../lib/gcc/arm-linux-gnueabihf/7.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find crt1.o: No such file or directory
/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/../lib/gcc/arm-linux-gnueabihf/7.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find crti.o: No such file or directory
collect2: error: ld returned 1 exit status
说找不到crt1.o，这就很奇怪了 因为crt1.o文件在我的sysroot目录下是存在的。
查看下GCC交叉编译工具的prefix目录（红色部分字体）是不存在的，因为可能这个工具是从别人那里拷过来的。
$/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc -v
Using built-in specs.
COLLECT_GCC=/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/../libexec/gcc/arm-linux-gnueabihf/7.2.1/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: '/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/snapshots/gcc.git~linaro-7.2-2017.11/configure' SHELL=/bin/bash --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto --enable-shared --without-included-gettext --enable-nls --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no --with-isl=no --disable-multilib --with-float=hard --with-fpu=vfpv3-d16 --with-mode=thumb --with-tune=cortex-a9 --with-arch=armv7-a --enable-threads=posix --enable-multiarch --enable-libstdcxx-time=yes --enable-gnu-indirect-function --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/sysroots/arm-linux-gnueabihf --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-linux-gnueabihf/libc --enable-checking=release --disable-bootstrap --enable-languages=c,c++,fortran,lto --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-linux-gnueabihf --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: posix
gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)
而我编译用到的一些系统头文件和库都在home/joe/worksource/toolchain_sdk_j6entry/sysroots/armv7ahf-neon-linux-gnueabi/目录下，于是在CC的后面加上--sysroot=home/joe/worksource/toolchain_sdk_j6entry/sysroots/armv7ahf-neon-linux-gnueabi/就可以通过了，如下所示：
$./configure --host=arm-linux-gnueabihf CC="/home/joe/worksource/toolchain_sdk_j6entry/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc --sysroot=/home/joe/worksource/toolchain_sdk_j6entry/sysroots/armv7ahf-neon-linux-gnueabi/" --prefix=/usr/local/ncurse --without-ada --enable-termcap --with-shared
特此记录下
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