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1、错误:
hello.o: In function `_start‘:
(.text+0x0): multiple definition of `_start‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.text+0x0): first defined here
hello.o:(.rodata+0x0): multiple definition of `_fp_hw‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata+0x0): first defined here
hello.o: In function `_fini‘:
(.fini+0x0): multiple definition of `_fini‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.fini+0x0): first defined here
hello.o:(.rodata+0x4): multiple definition of `_IO_stdin_used‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata.cst4+0x0): first defined here
hello.o: In function `__data_start‘:
(.data+0x0): multiple definition of `__data_start‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.data+0x0): first defined here
hello.o: In function `__data_start‘:
(.data+0x4): multiple definition of `__dso_handle‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/crtbegin.o:(.data+0x0): first defined here
hello.o: In function `_init‘:
(.init+0x0): multiple definition of `_init‘
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.init+0x0): first defined here
/usr/lib/gcc/i486-linux-gnu/4.4.3/crtend.o:(.dtors+0x0): multiple definition of `__DTOR_END__‘
hello.o:(.dtors+0x4): first defined here
/usr/bin/ld: warning: Cannot create .eh_frame_hdr section, --eh-frame-hdr ignored.
/usr/bin/ld: error in hello.o(.eh_frame); no .eh_frame_hdr table will be created.
collect2: ld returned 1 exit status
make: *** [hello] Error 1
原因:
经测试:单独编译hello.cpp的时候不会报上面的错误,而使用Makefile时会报出上面的错误,说明是Makefile的原因;
原版的Makefile是:
hello:hello.o
g++ -o hello hello.o
hello.o:hello.cpp hello.h
g++ -o hello.o hello.cpp
clean:
rm hello.o hello a.out
而修改后的Makefile为:
hello:hello.o
g++ -o hello hello.o
hello.o:hello.cpp hello.h
g++ -c hello.cpp
clean:
rm hello.o hello a.out
导致的原因是:参数-c是生成.o文件的(只编译,不连接),-o是确定生成文件名称;
感悟:
Makefile对文件的编译是分步进行的:
a) –c(只编译不连接);
b) 连接,生成执行文件;
2、错误:
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/crt1.o: In function `_start‘:
(.text+0x18): undefined reference to `main‘
collect2: ld returned 1 exit status
原因:一般出现这个问题是main打错了,或者没有写main,或者main被其他子函数包含了,注意检查下就好,我之前粗心,出现过这个问题,但是其他的文件gcc编译链接可以通过,就这个不能。
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原文地址:http://www.cnblogs.com/Joker714/p/4982160.html