-# remainderl.m4 serial 3
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# remainderl.m4 serial 7
+dnl Copyright (C) 2012-2013 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.
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_REMAINDER])
+ dnl Persuade glibc <math.h> to declare remainderl().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Test whether remainderl() exists. Assume that remainderl(), if it exists, is
dnl defined in the same library as remainder().
save_LIBS="$LIBS"
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ long double remainderl (long double, long double);
long double (*funcptr) (long double, long double) = remainderl;
long double x;
long double y;]],
])
LIBS="$save_LIBS"
if test $gl_cv_func_remainderl = yes; then
+ HAVE_REMAINDERL=1
REMAINDERL_LIBM="$REMAINDER_LIBM"
+ dnl Also check whether it's declared.
+ dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>.
+ AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]])
+
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $REMAINDERL_LIBM"
+ gl_FUNC_REMAINDERL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_remainderl_works" in
+ *yes) ;;
+ *) REPLACE_REMAINDERL=1 ;;
+ esac
+
m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainderl_ieee],
[
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double remainderl (long double, long double);
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
]])],
[gl_cv_func_remainderl_ieee=yes],
[gl_cv_func_remainderl_ieee=no],
- [gl_cv_func_remainderl_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_remainderl_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_remainderl_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainderl_ieee" in
])
else
HAVE_REMAINDERL=0
+ HAVE_DECL_REMAINDERL=0
fi
if test $HAVE_REMAINDERL = 0 || test $REPLACE_REMAINDERL = 1; then
dnl Find libraries needed to link lib/remainderl.c.
fi
AC_SUBST([REMAINDERL_LIBM])
])
+
+dnl Test whether remainderl() works.
+dnl It produces completely wrong values on OpenBSD 5.1/SPARC.
+AC_DEFUN([gl_FUNC_REMAINDERL_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether remainderl works], [gl_cv_func_remainderl_works],
+ [
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double remainderl (long double, long double);
+volatile long double x;
+volatile long double y;
+long double z;
+int main ()
+{
+ /* This test fails on OpenBSD 5.1/SPARC. */
+ x = 9.245907126L;
+ y = 3.141592654L;
+ z = remainderl (x, y);
+ if (z >= 0.0L)
+ return 1;
+ return 0;
+}
+]])],
+ [gl_cv_func_remainderl_works=yes],
+ [gl_cv_func_remainderl_works=no],
+ [case "$host_os" in
+ openbsd*) gl_cv_func_remainderl_works="guessing no";;
+ *) gl_cv_func_remainderl_works="guessing yes";;
+ esac
+ ])
+ ])
+])