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  gcc 编译问题 - fffyoufff [ 2008-01-21 12:21 | 1,483 byte(s)]
Re: gcc 编译问题 - fffyoufff [ 2008-01-21 12:26 | 4,267 byte(s)]
Re: gcc 编译问题 - fffyoufff [ 2008-01-21 14:24 | 229 byte(s)]
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很简单的问题，写了一个hello.c
=========
#include <stdio.h>
int main()
{
printf("hello world
");
return 1;
}
=========
在shell下运行以下命令成功
bash#gcc -o hello hello.c
但运行以下命令失败
bash#gcc -Wl, --verbose -o hello hello.c
以下是错误输出
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o hello /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crt1.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crti.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtbegin.o -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/lib -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../.. /tmp/ccethSfj.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtend.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crtn.o
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/ld: : No such file: No such file or directory
collect2: ld returned 1 exit status
问题：
为什么会失败？我只是传递了--verbose选项到ld而已？
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下面贴详细的吧
================================
linux-suse-10-3:/tmp # gcc -Wl, --verbose -o hello hello.c
Using built-in specs.
Target: x86_64-suse-linux
Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 --enable-languages=c,c++,objc,fortran,obj-c++,java,ada --enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.2.1 --enable-ssp --disable-libssp --disable-libgcj --with-slibdir=/lib64 --with-system-zlib --enable-shared --enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch --program-suffix=-4.2 --enable-version-specific-runtime-libs --without-system-libunwind --with-cpu=generic --host=x86_64-suse-linux
Thread model: posix
gcc version 4.2.1 (SUSE Linux)
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/cc1 -quiet -v hello.c -quiet -dumpbase hello.c -mtune=generic -auxbase hello -version -o /tmp/ccIFyAVO.s
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/include
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/include
/usr/include
End of search list.
GNU C version 4.2.1 (SUSE Linux) (x86_64-suse-linux)
compiled by GNU C version 4.2.1 (SUSE Linux).
GGC heuristics: --param ggc-min-expand=97 --param ggc-min-heapsize=126731
Compiler executable checksum: 15875aa798ad559dcc04a8709924cdb9
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/as -V -Qy -o /tmp/ccWaEUxv.o /tmp/ccIFyAVO.s
GNU assembler version 2.17.50 (x86_64-suse-linux) using BFD version (GNU Binutils) 2.17.50.20070726-14 (SUSE Linux)
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o hello /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crt1.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crti.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtbegin.o -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/lib -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../.. /tmp/ccWaEUxv.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtend.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crtn.o
/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/ld: : No such file: No such file or directory
collect2: ld returned 1 exit status
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
最搞的是我把gcc编译过程拆解成三步， 一步一步在shell下运行也是可以的
1） /usr/lib64/gcc/x86_64-suse-linux/4.2.1/cc1 -quiet -v hello.c -quiet -dumpbase hello.c -mtune=generic -auxbase hello -version -o /tmp/ccIFyAVO.s ->成功
2) /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/as -V -Qy -o /tmp/ccWaEUxv.o /tmp/ccIFyAVO.s ->成功
3) /usr/lib64/gcc/x86_64-suse-linux/4.2.1/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o hello /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crt1.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crti.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtbegin.o -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/lib -L/usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../.. /tmp/ccWaEUxv.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib64/gcc/x86_64-suse-linux/4.2.1/crtend.o /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../lib64/crtn.o ->也成功，并能正常生成hello可执行文件
但不知道为什么直接运行gcc -Wl, --verbose -o hello hello.c就不行了。。。
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瀑布汗。。。。
我找到原因了。。。
-Wl,<option>之间是不能有空格的。但我在command line里输入的是-Wl, --verbose，中间有空格。GCC就把参数解释为向ld传递一个“空”参数。所以才报错了。
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