-# expm1f.m4 serial 1
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# expm1f.m4 serial 2
+dnl Copyright (C) 2011-2013 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.
LIBS="$save_LIBS"
if test $ac_cv_func_expm1f = yes; then
EXPM1F_LIBM="$EXPM1_LIBM"
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $EXPM1F_LIBM"
+ gl_FUNC_EXPM1F_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_expm1f_works" in
+ *yes) ;;
+ *) REPLACE_EXPM1F=1 ;;
+ esac
else
HAVE_EXPM1F=0
+ fi
+ if test $HAVE_EXPM1F = 0 || test $REPLACE_EXPM1F = 1; then
dnl Find libraries needed to link lib/expm1f.c.
EXPM1F_LIBM="$EXPM1_LIBM"
fi
AC_SUBST([EXPM1F_LIBM])
])
+
+dnl Test whether expm1f() works.
+dnl On IRIX 6.5, for arguments <= -17.32868, it returns -5.6295e14.
+AC_DEFUN([gl_FUNC_EXPM1F_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether expm1f works], [gl_cv_func_expm1f_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <math.h>
+volatile float x;
+float y;
+int main ()
+{
+ x = -100.0f;
+ y = expm1f (x);
+ if (y < -1.0f)
+ return 1;
+ return 0;
+}
+]])],
+ [gl_cv_func_expm1f_works=yes],
+ [gl_cv_func_expm1f_works=no],
+ [case "$host_os" in
+ irix*) gl_cv_func_expm1f_works="guessing no";;
+ *) gl_cv_func_expm1f_works="guessing yes";;
+ esac
+ ])
+ ])
+])