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Code Issues

Much better ways to check for things that do not work correct with plain K&R C

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This commit is contained in:
alexpeshkoff 2009-04-21 11:55:01 +00:00
parent 4daf589cc5
commit 3128735e9e
1 changed files with 10 additions and 21 deletions
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31
configure.in
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@ -563,30 +563,19 @@ AC_CHECK_LIB(supc++, main, XE_APPEND(-lsupc++, STATIC_CXXSUPPORT_LIB))
AC_CHECK_LIB(gcc_eh, main, XE_APPEND(-lgcc_eh, STATIC_CXXSUPPORT_LIB))
AC_SUBST(STATIC_CXXSUPPORT_LIB)
AC_LANG_PUSH(C++)
dnl check for INFINITY in math.h
dnl _ISOC99_SOURCE is defined to emulate C++ compilation in plain-C conftest.c
AC_TRY_COMPILE([#define _ISOC99_SOURCE 1
#include <math.h>],
[double x = INFINITY;],
[AC_DEFINE(HAVE_INFINITY, 1,
[Define this if INFINITY is defined in math.h])])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <math.h>]], [[double x = INFINITY;]])],
AC_DEFINE(HAVE_INFINITY, 1, [Define this if INFINITY is defined in math.h]))
dnl check for va_copy() in stdarg.h
dnl _ISOC99_SOURCE is defined to emulate C++ compilation in plain-C conftest.c
AC_TRY_COMPILE([#define _ISOC99_SOURCE 1
#include <stdarg.h>
void vafun(const char* fmt, ...)
{
va_list par, par2;
va_start(par, fmt);
va_copy(par2, par);
va_end(par2);
va_end(par);
}
],
[exit(0);],
[AC_DEFINE(HAVE_VA_COPY, 1,
[Define this if va_copy() is defined in stdarg.h])])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <stdarg.h>
void vafun(const char* fmt, ...) {va_list par, par2; va_start(par, fmt); va_copy(par2, par); va_end(par2); va_end(par);}]],
[[return 0;]])],
AC_DEFINE(HAVE_VA_COPY, 1, [Define this if va_copy() is defined in stdarg.h]))
AC_LANG_POP(C++)
dnl Check for functions
AC_CHECK_FUNCS(gettimeofday)