为什么它在库搜索路径中寻找 libgcc，而不是 crt*.o 库(在下面的第二个代码块中向下滚动)？另外，为什么它会在 sysroot 下的 /lib 和 /usr/lib 中查找，而不是在 sysroot 下的 /tmptools/lib 中查找(这是我真正希望它查看的唯一路径)？这是交叉编译器的配置方式:
../binutils-2.26/configure --prefix="$LFS_CROSSTOOLCHAIN" --build=$LFS_BUILD_ARCH --host=$LFS_BUILD_ARCH --target=$LFS_TARGET_ARCH --with-lib-path="/tmptools/lib" --disable-multilib --disable-multiarch --disable-rpath --disable-nls --with-sysroot="$LFS_SYSROOT"
../gcc-6.1.0/configure --prefix="$LFS_CROSSTOOLCHAIN" --build=$LFS_BUILD_ARCH --host=$LFS_BUILD_ARCH --target=$LFS_TARGET_ARCH --disable-bootstrap --with-newlib --without-headers --with-local-prefix="/tmptools" --with-native-system-header-dir="/tmptools/include" --with-lib-path="/tmptools/lib" --disable-multilib --disable-multiarch --disable-rpath --enable-languages=c,c++ --disable-nls --with-sysroot="$LFS_SYSROOT"
其中 LFS_CROSSTOOLCHAIN=/home/main/lfs/3/crosstools 和 LFS_SYSROOT=/home/main/lfs/3/root。
这是示例输出:
$ 3/crosstools/bin/x86_64-lfs-linux-gnu-gcc -print-sysroot
/home/main/lfs/3/root
$ 3/crosstools/bin/x86_64-lfs-linux-gnu-ld -print-sysroot
/home/main/lfs/3/root
$ 3/crosstools/bin/x86_64-lfs-linux-gnu-gcc -Wl,--verbose test.c
GNU ld (GNU Binutils) 2.26.20160125
Supported emulations:
elf_x86_64
elf32_x86_64
elf_i386
elf_iamcu
i386linux
elf_l1om
elf_k1om
using internal linker script:
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==================================================
attempt to open crt1.o failed
attempt to open crti.o failed
attempt to open crtbegin.o failed
attempt to open /tmp/ccLVBgXQ.o succeeded
/tmp/ccLVBgXQ.o
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc.a failed
attempt to open /home/main/lfs/3/root/lib/libgcc.so failed
attempt to open /home/main/lfs/3/root/lib/libgcc.a succeeded
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc_s.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc_s.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/usr/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/usr/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libgcc_s.a failed
attempt to open /tmptools/lib/libgcc_s.so failed
attempt to open /tmptools/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libc.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libc.a failed
attempt to open /home/main/lfs/3/root/lib/libc.so failed
attempt to open /home/main/lfs/3/root/lib/libc.a failed
attempt to open /home/main/lfs/3/root/usr/lib/libc.so failed
attempt to open /home/main/lfs/3/root/usr/lib/libc.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libc.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libc.a failed
attempt to open /tmptools/lib/libc.so failed
attempt to open /tmptools/lib/libc.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libc.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libc.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc.a failed
attempt to open /home/main/lfs/3/root/lib/libgcc.so failed
attempt to open /home/main/lfs/3/root/lib/libgcc.a succeeded
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc_s.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/libgcc_s.a failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/usr/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/usr/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib64/libgcc_s.a failed
attempt to open /tmptools/lib/libgcc_s.so failed
attempt to open /tmptools/lib/libgcc_s.a failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libgcc_s.so failed
attempt to open /home/main/lfs/3/root/home/main/lfs/3/crosstools/x86_64-lfs-linux-gnu/lib/libgcc_s.a failed
attempt to open crtend.o failed
attempt to open crtn.o failed
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find crt1.o: No such file or directory
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find crti.o: No such file or directory
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find crtbegin.o: No such file or directory
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find -lgcc_s
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find -lc
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find -lgcc_s
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find crtend.o: No such file or directory
/home/main/lfs/3/crosstools/lib/gcc/x86_64-lfs-linux-gnu/6.1.0/../../../../x86_64-lfs-linux-gnu/bin/ld: cannot find crtn.o: No such file or directory
collect2: error: ld returned 1 exit status
最佳答案
当我构建用于交叉编译 ARM 的 GCC 工具链时，我使用了 this helpful tutorial .您看到的错误类似于跳过这些命令时发生的错误:
make -j4 csu/subdir_lib
install csu/crt1.o csu/crti.o csu/crtn.o /opt/cross/aarch64-linux/lib
这是用于向交叉编译器提供 GLIBC header 的命令序列的一部分。
mkdir -p build-glibc
cd build-glibc
../glibc-2.20/configure --prefix=/opt/cross/aarch64-linux --build=$MACHTYPE
--host=aarch64-linux --target=aarch64-linux \
--with-headers=/opt/cross/aarch64-linux/include \
--disable-multilib libc_cv_forced_unwind=yes
make install-bootstrap-headers=yes install-headers
make -j4 csu/subdir_lib
install csu/crt1.o csu/crti.o csu/crtn.o /opt/cross/aarch64-linux/lib \
aarch64-linux-gcc -nostdlib -nostartfiles -shared -x c /dev/null -o \
/opt/cross/aarch64-linux/lib/libc.so
touch /opt/cross/aarch64-linux/include/gnu/stubs.h
cd ..
不清楚 GLIBC 头文件是否已经在您的 sysroot 目录中，但我会首先检查以确保这些文件存在。如果您没有通过其他方式获得 GLIBC 头文件，则可能需要构建它们。
关于c++ - 为什么 GCC 交叉编译器不能找到所有的库？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38629117/