gcc向下兼容嗎，【實用工具】查看gcc/vs開啟的宏

1.gcc查看默認開啟的宏

gcc -dM -E - </dev/null

https://stackoverflow.com/questions/2295479/can-i-see-defined-macros-during-compilation-of-a-c-code

https://stackoverflow.com/questions/9025708/mingw-not-defining-win32-error-in-preprocessor-directives

https://stackoverflow.com/questions/18867367/using-avx-with-gcc-builtin-ia32-addpd256-not-declared

2. cl查看默認開啟的宏

/* MyC1.c */#include <stdio.h>
#include <stdlib.h>int main(void)
{char *p;if ((p = getenv("MSC_CMD_FLAGS")) != NULL)printf("MSC_CMD_FLAGS:\n%s\n", p);if ((p = getenv("MSC_IDE_FLAGS")) != NULL)printf("MSC_IDE_FLAGS:\n%s\n", p);return EXIT_FAILURE;
}

cl /B1MyC1.exe AnyNameHere.c  
cl /BxMyC1.exe AnyNameHere.cpp  

https://stackoverflow.com/questions/3665537/how-to-find-out-cl-exes-built-in-macros