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gtk/fallback-c89.c: Add C89 fallback for trunc()

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Check for trunc() during configure and provide a fallback implementation
for it if it is not found.
This commit is contained in:
Chun-wei Fan 2018-08-28 17:22:13 +08:00
parent ab3527672e
commit 723e50990f
3 changed files with 16 additions and 2 deletions
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5
config.h.win32.in
View File

@ -209,6 +209,11 @@
/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1
/* Define to 1 if trunc() is available */
#if !defined (_MSC_VER) || (_MSC_VER >= 1800)
# define HAVE_TRUNC 1
#endif
/* Define to 1 if you have the <unistd.h> header file. */
#ifndef _MSC_VER
#define HAVE_UNISTD_H 1

5
configure.ac
View File

@ -876,9 +876,10 @@ AC_CHECK_FUNCS(mallinfo)
AC_CHECK_FUNCS(getresuid)
AC_TYPE_UID_T
# Check for round(), rint(), isnan(), isinf() and nearbyint()
# Check for round(), rint(), isnan() and isinf()
# Check for log2(), exp2(), nearbyint() and trunc()
AC_CHECK_LIB(m,round,,)
AC_CHECK_FUNCS(round rint nearbyint sincos exp2 log2)
AC_CHECK_FUNCS(round rint nearbyint sincos exp2 log2 trunc)
AC_CHECK_DECLS([isnan, isinf], [], [], [[#include <math.h>]])
# Checks for gdkspawn

8
gtk/fallback-c89.c
View File

@ -106,3 +106,11 @@ exp2 (double x)
return pow (2.0, x);
}
#endif
#ifndef HAVE_TRUNC
static inline double
trunc (double x)
{
return (x > 0 ? floor (x) : ceil (x));
}
#endif