-# ldexpl.m4 serial 10
+# ldexpl.m4 serial 13
dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM
dnl Check whether it's declared.
dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])
+ AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [[#include <math.h>]])
LDEXPL_LIBM=
if test $HAVE_DECL_LDEXPL = 1; then
gl_CHECK_LDEXPL_NO_LIBM
fi
fi
if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then
- AC_LIBOBJ([ldexpl])
+ dnl Find libraries needed to link lib/ldexpl.c.
LDEXPL_LIBM="$ISNANL_LIBM"
fi
AC_SUBST([LDEXPL_LIBM])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <math.h>
-extern long double ldexpl (long double, int);
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double ldexpl (long double, int);
int main()
{
int result = 0;