在GCC中使用-Wall -Wextra並出現錯誤

我不知道爲什麼我收到這些錯誤，當我編譯GCC並且不使用-Wall和-Wextra程序編譯得很好。但是，當我使用標誌-Wall和-Wextra時，我收到編譯錯誤。在GCC中使用-Wall -Wextra並出現錯誤

下面是測試程序，我跑：

#include <stdio.h> 
#include <string.h> 
#include <math.h> 
#include <stdlib.h> 

int main(void) 
{ 
    return 0; 
}

...這是錯誤，我從獲得：

/home/definity/Desktop/Cloud/code/funcptr: In function `_fini': 
(.fini+0x0): multiple definition of `_fini' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o:(.fini+0x0): first defined here 
/home/definity/Desktop/Cloud/code/funcptr: In function `data_start': 
(.data+0x0): multiple definition of `__data_start' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o:(.data+0x0): first defined here 
/home/definity/Desktop/Cloud/code/funcptr: In function `data_start': 
(.data+0x8): multiple definition of `__dso_handle' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtbegin.o:(.data+0x0): first defined here 
/home/definity/Desktop/Cloud/code/funcptr:(.rodata+0x0): multiple definition of `_IO_stdin_used' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o:(.rodata.cst4+0x0): first defined here 
/home/definity/Desktop/Cloud/code/funcptr: In function `_start': 
(.text+0x0): multiple definition of `_start' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o:(.text+0x0): first defined here 
/home/definity/Desktop/Cloud/code/funcptr: In function `main': 
/home/definity/Desktop/Cloud/code/funcptr.c:35: multiple definition of `main' 
/tmp/cctHUnUj.o:/home/definity/Desktop/Cloud/code/funcptr.c:9: first defined here 
/home/definity/Desktop/Cloud/code/funcptr: In function `_init': 
(.init+0x0): multiple definition of `_init' 
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o:(.init+0x0): first defined here 
/usr/lib/gcc/x86_64-linux-gnu/4.7/crtend.o:(.tm_clone_table+0x0): multiple definition of `__TMC_END__' 
/home/definity/Desktop/Cloud/code/funcptr:(.data+0x10): first defined here 
/usr/bin/ld: error in /home/definity/Desktop/Cloud/code/funcptr(.eh_frame); no .eh_frame_hdr table will be created. 
collect2: error: ld returned 1 exit status 
[Finished in 0.1s with exit code 1]

......我無法解釋這些錯誤。有人可以解釋爲什麼會發生這些錯誤，我可以做些什麼來防止這種情況在將來發生？

來源

2013-08-16 Definity

是編譯成功沒有'-Wall -Wextra'？我敢肯定，他們不會將任何警告轉化爲錯誤，所以我想知道如果沒有它們，它會起作用。你可能會搞砸GCC安裝。 –

你改變了這個問題嗎？ –

我試試你的代碼和'gcc -Wall -Wextra'它。它只是編譯好！ –

基於this link：

-Wall 
      This enables all the warnings about constructions that some users consider 
questionable, and that are easy to avoid (or modify to prevent the warning), even in 
conjunction with macros. This also enables some language-specific warnings described in C++ Dialect Options and Objective-C and Objective-C++ Dialect Options. 

      -Wall turns on the following warning flags: 

         -Waddress 
         -Warray-bounds (only with -O2) 
         -Wc++11-compat 
         -Wchar-subscripts 
         -Wenum-compare (in C/ObjC; this is on by default in C++) 
         -Wimplicit-int (C and Objective-C only) 
         -Wimplicit-function-declaration (C and Objective-C only) 
         -Wcomment 
         -Wformat 
         -Wmain (only for C/ObjC and unless -ffreestanding) 
         -Wmaybe-uninitialized 
         -Wmissing-braces (only for C/ObjC) 
         -Wnonnull 
         -Wparentheses 
         -... 

      Note that some warning flags are not implied by -Wall. Some of them warn about 
     constructions that users generally do not consider questionable, but which occasionally you might wish to check for; others warn about constructions that are necessary or hard to 
    avoid in some cases, and there is no simple way to modify the code to suppress the warning. 
    Some of them are enabled by -Wextra but many of them must be enabled individually.

來源

2013-08-16 02:28:12

在GCC中使用-Wall -Wextra並出現錯誤

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