-# ldexpl.m4 serial 10
-dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
+# ldexpl.m4 serial 16
+dnl Copyright (C) 2007-2014 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_LDEXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM
+
+ dnl Persuade glibc <math.h> to declare ldexpl().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
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>])
+ dnl Mac OS 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>]])
+
LDEXPL_LIBM=
if test $HAVE_DECL_LDEXPL = 1; then
gl_CHECK_LDEXPL_NO_LIBM
fi
fi
if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then
- AC_LIBOBJ([ldexpl])
- LDEXPL_LIBM="$ISNANL_LIBM"
+ dnl Find libraries needed to link lib/ldexpl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_LDEXP])
+ LDEXPL_LIBM="$LDEXP_LIBM"
+ else
+ LDEXPL_LIBM="$ISNANL_LIBM"
+ fi
fi
AC_SUBST([LDEXPL_LIBM])
])
])
dnl Test whether ldexpl() works on finite numbers (this fails on AIX 5.1
-dnl and MacOS X 10.4/PowerPC).
+dnl and Mac OS X 10.4/PowerPC).
AC_DEFUN([gl_FUNC_LDEXPL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
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;