clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations float/DBL_HAS_SUBNORM.c -o float/DBL_HAS_SUBNORM -D_POSIX_C_SOURCE=202405L  -lm  -lintl
float/DBL_HAS_SUBNORM.c:3:2: error: "DBL_HAS_SUBNORM is not defined"
#error "DBL_HAS_SUBNORM is not defined"
 ^
1 error generated.