-# expl.m4 serial 2
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# expl.m4 serial 5
+dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_EXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare expl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|| test $gl_cv_func_expl_in_libm = yes; then
dnl Also check whether it's declared.
dnl MacOS X 10.3 has expl() in libc but doesn't declare it in <math.h>.
- AC_CHECK_DECL([expl], , [HAVE_DECL_EXPL=0], [#include <math.h>])
+ AC_CHECK_DECL([expl], , [HAVE_DECL_EXPL=0], [[#include <math.h>]])
else
HAVE_DECL_EXPL=0
HAVE_EXPL=0
- AC_LIBOBJ([expl])
- AC_REQUIRE([gl_FUNC_FLOORL])
- EXPL_LIBM="$FLOORL_LIBM"
+ dnl Find libraries needed to link lib/expl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_EXP])
+ EXPL_LIBM="$EXP_LIBM"
+ else
+ AC_REQUIRE([gl_FUNC_FLOORL])
+ EXPL_LIBM="$FLOORL_LIBM"
+ fi
fi
AC_SUBST([EXPL_LIBM])
])