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diff m4/rintl.m4 @ 40116:54732a1c637e

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rintl: Override broken implementation on NetBSD. * lib/math.in.h (rintl): Test also REPLACE_RINTL. * m4/rintl.m4 (gl_FUNC_RINTL): Add test for negative arguments. Set REPLACE_RINTL. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_RINTL. * modules/math (Makefile.in): Substitute REPLACE_RINTL. * modules/rintl (Depends-on, configure.ac): Test REPLACE_RINTL. * doc/posix-functions/rintl.texi: Mention the NetBSD bug.
author Bruno Haible <bruno@clisp.org>
date Mon, 21 Jan 2019 00:33:28 +0100
parents b06060465f09
children
line wrap: on
line diff
--- a/m4/rintl.m4	Sun Jan 20 23:48:18 2019 +0100
+++ b/m4/rintl.m4	Mon Jan 21 00:33:28 2019 +0100
@@ -1,4 +1,4 @@
-# rintl.m4 serial 4
+# rintl.m4 serial 5
 dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -14,9 +14,61 @@
 
   dnl Determine RINTL_LIBM.
   gl_MATHFUNC([rintl], [long double], [(long double)])
-  if test $gl_cv_func_rintl_no_libm = no \
-     && test $gl_cv_func_rintl_in_libm = no; then
+  if test $gl_cv_func_rintl_no_libm = yes \
+     || test $gl_cv_func_rintl_in_libm = yes; then
+    if test $REPLACE_RINTL = 0; then
+      AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+      AC_CACHE_CHECK([whether rintl works],
+        [gl_cv_func_rintl_works],
+        [
+          save_LIBS="$LIBS"
+          LIBS="$LIBS $RINTL_LIBM"
+          AC_RUN_IFELSE(
+            [AC_LANG_SOURCE([[
+#include <math.h>
+#undef rintl
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double rintl (long double);
+static long double dummy (long double x) { return 0; }
+int main (int argc, char *argv[])
+{
+  long double (* volatile my_rintl) (long double) = argc ? rintl : dummy;
+  int result = 0;
+  /* This test fails on NetBSD 8.0.  */
+  {
+    volatile long double x = -0.3L;
+    long double y = my_rintl (x);
+    if (!(y == 0.0L))
+      result |= 1;
+  }
+  return result;
+}
+            ]])],
+            [gl_cv_func_rintl_works=yes],
+            [gl_cv_func_rintl_works=no],
+            [case "$host_os" in
+                              # Guess yes on glibc systems.
+               *-gnu* | gnu*) gl_cv_func_rintl_works="guessing yes" ;;
+                              # Guess yes on native Windows.
+               mingw*)        gl_cv_func_rintl_works="guessing yes" ;;
+                              # If we don't know, assume the worst.
+               *)             gl_cv_func_rintl_works="guessing no" ;;
+             esac
+            ])
+          LIBS="$save_LIBS"
+        ])
+      case "$gl_cv_func_rintl_works" in
+        *yes) ;;
+        *) REPLACE_RINTL=1 ;;
+      esac
+    fi
+  else
     HAVE_RINTL=0
+  fi
+  if test $HAVE_RINTL = 0 || test $REPLACE_RINTL = 1; then
     dnl Find libraries needed to link lib/rintl.c.
     if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
       AC_REQUIRE([gl_FUNC_RINT])