Question

我的makefile代码一直出错，我不知道如何修复它，我在网站上搜索了一个答案并最终建立了一个帐户来寻求帮助这是错误代码

date.o: In function `_start':
(.text+0x0): multiple definition of `_start'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o:(.text+0x0): first defined here
date.o: In function `_fini':
(.fini+0x0): multiple definition of `_fini'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o (.fini+0x0): first defined here
date.o:(.rodata+0x0): multiple definition of `_IO_stdin_used'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o (.rodata.cst4+0x0): first defined here
date.o: In function `data_start':
(.data+0x0): multiple definition of `__data_start'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o:(.data+0x0): first defined here
date.o: In function `data_start':
(.data+0x8): multiple definition of `__dso_handle'
/usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o:(.data+0x0): first defined here
date.o: In function `_init':
(.init+0x0): multiple definition of `_init'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o (.init+0x0): first defined here
/usr/lib/gcc/x86_64-linux-gnu/5/crtend.o:(.tm_clone_table+0x0): multiple definition of `__TMC_END__'
date.o:(.data+0x10): first defined here
/usr/bin/ld: error in date.o(.eh_frame); no .eh_frame_hdr table will be created.
collect2: error: ld returned 1 exit status
Makefile:3: recipe for target 'testdate' failed
make: *** [testdate] Error 1

和我的makefile

testdate: date.o testdate.o
        g++ -Wall -o testdate.o date.o

date.o: date.h date.cpp
        g++ -Wall -c date.cpp
testdate.o: date.h testdate.cpp
        g++ -Wall -c testdate.cpp

Answer 1

规则

testdate: date.o testdate.o
        g++ -Wall -o testdate.o date.o

应该是

testdate: date.o testdate.o
        g++ -Wall -o testdate testdate.o date.o
#                    ^^^^^^^^

或避免重复自己：

testdate: date.o testdate.o
        g++ -Wall $^ -o $@

（这应该产生g++ -Wall date.o testdate.o -o testdate）

确实，您可能需要考虑：

testdate: date.o testdate.o
        g++ -Wall $^ -o $@
date.o: date.cpp date.h
    g++ -Wall -c $< -o $@
testdate.o: testdate.cpp date.h
    g++ -Wall -c $< -o $@

$^是所有依赖项，$<只是第一个，$@是当前目标。

有关Makefile规则的更多信息：https://www.chemie.fu-berlin.de/chemnet/use/info/make/make_4.html

'_start'的多重定义

1 个答案: