コンパイラがどのC言語規格で動いているかをチェックする

code:memo.c

// constants (or macros)

# define __STDC__ 0

# define __STDC_VERSION__ 0

int main()

{

if (!__STDC__ && !__STDC_VERSION__) printf("The C compiler does not comply with the C89 or later standard!\nIt likely complies with the 1978 K&R C standard (informally known as C78).\n");

else if (__STDC_VERSION__ >= 201710L) printf("The C compiler complies with the C17 standard.\n");

else if (__STDC_VERSION__ >= 201112L) printf("The C compiler complies with the C11 standard.\n");

else if (__STDC_VERSION__ >= 199901L) printf("The C compiler complies with the C99 standard.\n");

else if (__STDC_VERSION__ >= 199409L) printf("The C compiler complies with the amended C90 standard (also known as C95).\n");

else if (__STDC__) printf("The C compiler complies with the ANSI C89 / ISO C90 standard.\n");

puts("");

if (__STDC__) printf("\"__STDC__\": %ld\n", __STDC_VERSION__);

if (__STDC_VERSION__) printf("\"__STDC_VERSION__\": %ld\n\n", __STDC_VERSION__);

puts("");

if (__STDC_VERSION__ >= 199901L) printf(" INFINITY (added in C99): %f\n", INFINITY ); // Also works with %lf and %Lf

if (__STDC_VERSION__ >= 199901L) printf("-INFINITY (added in C99): %f\n", -INFINITY ); // Also works with %lf and %Lf

puts("");

if (__STDC_VERSION__ >= 199901L) printf(" HUGE_VALF (added in C99): %f\n", HUGE_VALF );

if (__STDC_VERSION__ >= 199901L) printf("-HUGE_VALF (added in C99): %f\n", -HUGE_VALF );

puts("");

if (__STDC__) printf(" HUGE_VAL (added in C89 (ANSI) which is the same as C90 (ISO)): %lf\n", HUGE_VAL );

if (__STDC__) printf("-HUGE_VAL (added in C89 (ANSI) which is the same as C90 (ISO)): %lf\n", -HUGE_VAL );

puts("");

if (__STDC_VERSION__ >= 199901L) printf(" HUGE_VALL (added in C99): %Lf\n", HUGE_VALL );

if (__STDC_VERSION__ >= 199901L) printf("-HUGE_VALL (added in C99): %Lf\n", -HUGE_VALL );

return 0;

}

ドキュメントから調べる場合

Red Hat Enterprise Linux系列の場合

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参考