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Workaround compiling with -ffast-math 

And add a compiler warning.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2018-11-02 13:57:19 +00:00
parent 45e9530bcb
commit be09a9a835
3 changed files with 13 additions and 2 deletions
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2
src/compton.c
View File

@ -4016,7 +4016,7 @@ get_cfg(session_t *ps, int argc, char *const *argv, bool first_pass) {
ps->o.wintype_shadow[WINTYPE_DND] = false;
if (fading_enable)
wintype_arr_enable(ps->o.wintype_fade);
if (!isnan(cfgtmp.menu_opacity)) {
if (!safe_isnan(cfgtmp.menu_opacity)) {
ps->o.wintype_opacity[WINTYPE_DROPDOWN_MENU] = cfgtmp.menu_opacity;
ps->o.wintype_opacity[WINTYPE_POPUP_MENU] = cfgtmp.menu_opacity;
}

11
src/utils.h
View File

@ -4,6 +4,17 @@
#include <ctype.h>
#include <stddef.h>
#include <stdlib.h>
#include <math.h>
#ifdef __FAST_MATH__
#warning Use of -ffast-math can cause rendering error or artifacts, \
therefore it is not recommended.
#endif
__attribute__((optimize("-fno-fast-math")))
static inline bool safe_isnan(double a) {
return isnan(a);
}
/**
* Normalize an int value to a specific range.

2
src/win.c
View File

@ -324,7 +324,7 @@ void win_calc_opacity(session_t *ps, win *w) {
// Try obeying opacity property and window type opacity firstly
if (w->has_opacity_prop)
opacity = w->opacity_prop;
else if (!isnan(ps->o.wintype_opacity[w->window_type]))
else if (!safe_isnan(ps->o.wintype_opacity[w->window_type]))
opacity = ps->o.wintype_opacity[w->window_type] * OPAQUE;
else {
// Respect active_opacity only when the window is physically focused