macos compiler fix

diff --git a/libs/uniquenames.h b/libs/uniquenames.h
index 9f89ba455..cd327a7cf 100644
--- a/libs/uniquenames.h
+++ b/libs/uniquenames.h
@@ -106,14 +106,46 @@ inline void name_write( char* buffer, name_t name ){

 inline name_t name_read( const char* name ){
    const char* end = name + strlen( name );
+
+#if GDEF_OS_MACOS
+   /* HACK: Apple shipped a clang built for macOS with an optimization enabled
+   that is not available on macOS. This error may then be faced:
+
+     ld: Undefined symbols:
+       _memrchr, referenced from:
+           name_read(char const*) in map.cpp.o
+           name_read(char const*) in map.cpp.o
+
+   This is a compiler error:
+
+   > On Mac OSX (macOS version 12.4, sdk version 12.1) llvm can replace call
+   > to strrchr() with call to memrchr() when string length is known at
+   > compile time. This results in link error, because memrchr is not present
+   > in libSystem.
+   > -- https://github.com/llvm/llvm-project/issues/62254
+
+   We workaround this by making the string length not known at build time
+   to avoid triggering the unavailable optimization. */
+
+   char *numbers;
+   numbers = (char*) malloc( 11 * sizeof( char ) );
+   strcpy( numbers, "1234567890" );
+#else
+   const char *numbers = "1234567890";
+#endif
+
    for ( const char* p = end; end != name; --p )
    {
-       if ( strrchr( "1234567890", *p ) == NULL ) {
+       if ( strrchr( numbers, *p ) == NULL ) {
            break;
        }
        end = p;
    }

+#if GDEF_OS_MACOS
+   free( numbers );
+#endif
+
    return name_t( CopiedString( StringRange( name, end ) ), Postfix( end ) );
 }