如何打印來自llvm/clang的依賴關係（相當於gcc -MD）？

Question

我們的構建系統使用gcc來生成源文件的標題依賴於* .d文件，編譯時：

gcc -MD -MF foo.d -c foo.o foo.cc 

但是，我想不出如何產生與LLVM鐺類似的輸出。

Answer 1

這是完全一樣的：

clang -MD -MF foo.d -c foo.o foo.cc 

一個例子：

$ cat example.c 
#include <stdio.h> 

int main(int argc, char **argv) 
{ 
    printf("Hello, world!\n"); 
    return 0; 
} 

$ clang -MD -MF example-clang.d -c -o example-clang.o example.c 

$ gcc -MD -MF example-gcc.d -c -o example-gcc.o example.c 

$ cat example-clang.d 
example-clang.o: example.c /usr/include/stdio.h /usr/include/_types.h \ 
    /usr/include/sys/_types.h /usr/include/sys/cdefs.h \ 
    /usr/include/machine/_types.h /usr/include/i386/_types.h \ 
    /usr/include/secure/_stdio.h /usr/include/secure/_common.h 

$ cat example-gcc.d 
example-gcc.o: example.c /usr/include/stdio.h /usr/include/_types.h \ 
    /usr/include/sys/_types.h /usr/include/sys/cdefs.h \ 
    /usr/include/machine/_types.h /usr/include/i386/_types.h \ 
    /usr/include/secure/_stdio.h /usr/include/secure/_common.h 

$ diff example-clang.d example-gcc.d 
1c1 
< example-clang.o: example.c /usr/include/stdio.h /usr/include/_types.h \ 
--- 
> example-gcc.o: example.c /usr/include/stdio.h /usr/include/_types.h \