Re: A failed test against aarch64

[Bruno Haible]

Mosab Al-Zoubi <moceap@hotmail.com> wrote:
> Please see the bug at RHBZ:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=2220874

Thanks for the report. I have reported a bug upstream in glibc
https://sourceware.org/bugzilla/show_bug.cgi?id=30620
and added a workaround in gnulib.


2023-07-06  Bruno Haible  <bruno@clisp.org>

        wcscmp: Work around a glibc bug.
        Reported by مصعب الزعبي (Mosab Al-Zoubi) <moceap@hotmail.com> in
        <https://lists.gnu.org/archive/html/bug-gnulib/2023-07/msg00029.html>.
        * m4/wcscmp.m4 (gl_FUNC_WCSCMP): Test against a glibc/arm* bug.
        * doc/posix-functions/wcscmp.texi: Mention the glibc/arm* bug.

diff --git a/doc/posix-functions/wcscmp.texi b/doc/posix-functions/wcscmp.texi
index bc64d28f56..2ce58db350 100644
--- a/doc/posix-functions/wcscmp.texi
+++ b/doc/posix-functions/wcscmp.texi
@@ -15,6 +15,8 @@
 @item
 This function may return a wrong result if the two arguments are of different
 length, on some platforms:
+@c https://sourceware.org/bugzilla/show_bug.cgi?id=30620
+glibc 2.37 on arm and arm64 CPUs,
 AIX 7.2 in 64-bit mode.
 @end itemize
 
diff --git a/m4/wcscmp.m4 b/m4/wcscmp.m4
index a3000ed275..2060da1e76 100644
--- a/m4/wcscmp.m4
+++ b/m4/wcscmp.m4
@@ -1,4 +1,4 @@
-# wcscmp.m4 serial 3
+# wcscmp.m4 serial 4
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -33,6 +33,10 @@ AC_DEFUN([gl_FUNC_WCSCMP]
                 int cmp = wcscmp (c, d);
                 if (!((wchar_t)-1 < 0 ? cmp > 0 : cmp < 0))
                   result |= 2;
+                /* This test fails on glibc 2.37 on arm and arm64 CPUs.  */
+                cmp = wcscmp (d, c);
+                if (!((wchar_t)-1 < 0 ? cmp < 0 : cmp > 0))
+                  result |= 4;
               }
               return result;
             }