diff options
| author | Explorer09 <explorer09@gmail.com> | 2023-07-31 05:05:43 +0800 |
|---|---|---|
| committer | BenBE <BenBE@geshi.org> | 2023-08-18 12:52:28 +0200 |
| commit | 93d76fd37627a3594f52afda32092fa3858f28dc (patch) | |
| tree | 2ce03a5ca873cbaa3db6c96f174fd8c037f07e8b /configure.ac | |
| parent | b416433fbe7ccf935ad4e268396aa423143c2318 (diff) | |
Add a check and warning about signaling NaN support to 'configure.ac'
Add a check of the '__SUPPORT_SNAN__' predefined macro and print a
warning message if the compiler defines it. The warning is not printed
with '--enable-debug' specified as we assume users know what they are
doing. :)
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 07c3ee85..c05f4d62 100644 --- a/configure.ac +++ b/configure.ac @@ -758,6 +758,22 @@ AC_ARG_ENABLE([debug], [enable_debug=no]) if test "x$enable_debug" != xyes; then AM_CPPFLAGS="$AM_CPPFLAGS -DNDEBUG" + + AC_COMPILE_IFELSE([ + AC_LANG_SOURCE([[ +#ifdef __SUPPORT_SNAN__ +#error "signaling NaN support not recommended" +#endif + ]])], + :, + [warning_msg="signaling NaN support is enabled; not recommended for htop" + case "$CC" in + *gcc*) + warning_msg="$warning_msg (use '-fno-signaling-nans' compiler flag to disable)" + ;; + esac + AC_MSG_WARN([$warning_msg]) + ]) else AM_CPPFLAGS="$AM_CPPFLAGS -ggdb3" fi |