diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 42 |
1 files changed, 29 insertions, 13 deletions
diff --git a/configure.ac b/configure.ac index 8f8606c2..07c3ee85 100644 --- a/configure.ac +++ b/configure.ac @@ -203,21 +203,42 @@ AC_COMPILE_IFELSE([ CFLAGS="$old_CFLAGS" AC_MSG_CHECKING(for NaN support) -AC_RUN_IFELSE([ +dnl Note: AC_RUN_IFELSE does not try compiling the program at all when +dnl $cross_compiling is 'yes'. +AC_LINK_IFELSE([ AC_LANG_PROGRAM( [[ - #include <math.h> +#include <math.h> ]], [[ - double x = NAN; return !isnan(x); + double x = NAN; + /* Both should evaluate to false -> 0 (exit success) */ + return isgreater(x, x) || isgreaterequal(x, x); ]] )], - [AC_MSG_RESULT(yes)], - [ + [flag_finite_math_only=unknown + if test "$cross_compiling" = yes; then + AC_COMPILE_IFELSE([ + AC_LANG_SOURCE([[ +/* __FINITE_MATH_ONLY__ is documented in Clang. */ +#ifdef __FINITE_MATH_ONLY__ +#error "should not enable -ffinite-math-only" +#endif + ]])], + AC_MSG_RESULT([assume yes (cross compiling)]), + flag_finite_math_only=yes) + elif ./conftest$EXEEXT >&AS_MESSAGE_LOG_FD; then + flag_finite_math_only=no + AC_MSG_RESULT(yes) + else + flag_finite_math_only=yes + fi + if test "$flag_finite_math_only" = yes; then AC_MSG_RESULT(no) - AC_MSG_WARN([Compiler does not respect NaN, some functionality might break; consider using '-fno-finite-math-only']) - ], - [AC_MSG_RESULT(skipped)]) + AC_MSG_WARN([runtime behavior with NaN is not compliant - some functionality might break; consider using '-fno-finite-math-only']) + fi], + [AC_MSG_RESULT(no) + AC_MSG_ERROR([can not find required macros: NAN, isgreater() and isgreaterequal()])]) # ---------------------------------------------------------------------- @@ -700,11 +721,6 @@ AM_CFLAGS="\ -Wunused\ -Wwrite-strings" -# FreeBSD uses C11 _Generic in its isnan implementation, even with -std=c99 -if test "$my_htop_platform" = freebsd; then - AM_CFLAGS="$AM_CFLAGS -Wno-c11-extensions" -fi - dnl https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html AC_DEFUN([AX_CHECK_COMPILE_FLAG], [ |