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option-context.c: Define NAN if not defined on MSVC

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This will enable the build to succeed on older Visual Studio versions
that don't support NAN yet.  Other supported compilers should support
this.
This commit is contained in:
Chun-wei Fan 2021-03-31 16:52:18 +08:00
parent d51c3b01fe
commit 20bd716d4c
1 changed files with 18 additions and 0 deletions
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18
glib/tests/option-context.c
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@ -28,6 +28,24 @@
#include <locale.h> #include <locale.h>
#include <math.h> #include <math.h>
#ifdef _MSC_VER
# ifndef NAN
/*
* From the Visual Studio 2013+ math.h, we have the following:
* #ifndef _HUGE_ENUF
* #define _HUGE_ENUF 1e+300 // _HUGE_ENUF*_HUGE_ENUF must overflow
* #endif
*
* #define INFINITY ((float)(_HUGE_ENUF * _HUGE_ENUF))
* ...
* #define NAN ((float)(INFINITY * 0.0F))
* ...
* so, HUVE_VAL * HUGE_VAL would be a good approximation of INFINITY without
* defining anything extra
*/
# define NAN HUGE_VAL * HUGE_VAL * 0.0f
# endif
#endif
static GOptionEntry main_entries[] = { static GOptionEntry main_entries[] = {
{ "main-switch", 0, 0, { "main-switch", 0, 0,