From 044a98e6d3c47f512c779b38bddb975c5de67577 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Thu, 25 Jan 2024 19:20:28 +0100
Subject: [PATCH] tests: Check whether C library supports collation with
 locales

Fixes #104.
---
 tests/runtest.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tests/runtest.c b/tests/runtest.c
index f61c66a5..9b024387 100644
--- a/tests/runtest.c
+++ b/tests/runtest.c
@@ -595,10 +595,28 @@ xsltTest(const char *filename, int options) {
 
     if (strcmp(filename, "./test-10-3.xsl") == 0) {
         void *locale = xsltNewLocale(BAD_CAST "de", 0);
+        xmlChar *str1, *str2;
+
         /* Skip test requiring "de" locale */
         if (locale == NULL)
             return(0);
+
+        /*
+         * Some C libraries like musl or older macOS don't support
+         * collation with locales.
+         */
+        str1 = xsltStrxfrm(locale, BAD_CAST "\xC3\xA4");
+        str2 = xsltStrxfrm(locale, BAD_CAST "b");
+        res = xmlStrcmp(str1, str2);
+        xmlFree(str1);
+        xmlFree(str2);
         xsltFreeLocale(locale);
+
+        if (res >= 0) {
+            fprintf(stderr, "Warning: Your C library doesn't seem to support "
+                    "collation with locales");
+            return(0);
+        }
     }
 
     styleDoc = xmlReadFile(filename, NULL, XSLT_PARSE_OPTIONS | options);
-- 
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