From: Bruno Haible <bruno@clisp.org>
Date: Tue, 3 Feb 2026 00:30:28 +0000 (+0100)
Subject: isfinite-no-c++: Avoid unnecessary override of isfinite().
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8839fff60a53a4f78681fbbcb5da0010a222186b;p=thirdparty%2Fgnulib.git

isfinite-no-c++: Avoid unnecessary override of isfinite().

* m4/isfinite.m4 (gl_ISFINITEL_WORKS): Link the test program with -lm if
necessary.
---

diff --git a/ChangeLog b/ChangeLog
index 6acf890d4d..cb72d4f12e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2026-02-02  Bruno Haible  <bruno@clisp.org>
+
+	isfinite-no-c++: Avoid unnecessary override of isfinite().
+	* m4/isfinite.m4 (gl_ISFINITEL_WORKS): Link the test program with -lm if
+	necessary.
+
 2026-01-29  Bruno Haible  <bruno@clisp.org>
 
 	gettext: Partially update to gettext 1.0.
diff --git a/m4/isfinite.m4 b/m4/isfinite.m4
index 44d97aa3f0..6515b648b6 100644
--- a/m4/isfinite.m4
+++ b/m4/isfinite.m4
@@ -1,5 +1,5 @@
 # isfinite.m4
-# serial 23
+# serial 24
 dnl Copyright (C) 2007-2026 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -53,6 +53,8 @@ AC_DEFUN([gl_ISFINITEL_WORKS],
   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   AC_CACHE_CHECK([whether isfinite(long double) works], [gl_cv_func_isfinitel_works],
     [
+      saved_LIBS="$LIBS"
+      LIBS="$LIBS $ISFINITE_LIBM"
       AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <float.h>
 #include <limits.h>
@@ -176,5 +178,6 @@ int main ()
          *)                 gl_cv_func_isfinitel_works="guessing yes" ;;
        esac
       ])
+      LIBS="$saved_LIBS"
     ])
 ])