[xen staging] libxl: constify some local variables for building with glibc 2.43

[patchbot@xxxxxxx]

commit 44da0e3b4ff7fa15ad28b628f57412a05dae653c
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Thu Feb 26 13:31:48 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 26 13:31:48 2026 +0100

    libxl: constify some local variables for building with glibc 2.43
    
    Archlinux just updated glibc to 2.43+r5+g856c426a7534-1 and that
    causes libxl build failure:
    
        libxl_cpuid.c: In function â??libxl_cpuid_parse_config_xendâ??:
        libxl_cpuid.c:447:16: error: assignment discards â??constâ?? qualifier 
from pointer target type [-Werror=discarded-qualifiers]
          447 |         endptr = strchr(str, '=');
              |                ^
        libxl_cpuid.c:452:16: error: assignment discards â??constâ?? qualifier 
from pointer target type [-Werror=discarded-qualifiers]
          452 |         endptr = strchr(str, ',');
              |                ^
        libxl_cpuid.c:454:20: error: assignment discards â??constâ?? qualifier 
from pointer target type [-Werror=discarded-qualifiers]
          454 |             endptr = strchr(str, 0);
              |                    ^
        cc1: all warnings being treated as errors
    
    Add missing consts. Note in libxl_cpuid_parse_config_xend() non-const
    endptr still is needed, to be compatible with the second argument to
    strtoul(). Add second variable for this reason.
    
    And while at it, move semicolon to its own line
    
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libs/light/libxl_cpuid.c    | 21 ++++++++++++---------
 tools/libs/light/libxl_internal.c |  2 +-
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c
index 8420b2465f..14f08df33a 100644
--- a/tools/libs/light/libxl_cpuid.c
+++ b/tools/libs/light/libxl_cpuid.c
@@ -440,29 +440,32 @@ int libxl_cpuid_parse_config_xend(libxl_cpuid_policy_list 
*policy,
     str = endptr + 1;
     entry = cpuid_find_match(policy, leaf, subleaf);
     for (str = endptr + 1; *str != 0;) {
+        const char *endptrc;
+
         if (str[0] != 'e' || str[2] != 'x') {
             return 4;
         }
         value = str[1] - 'a';
-        endptr = strchr(str, '=');
-        if (value > 3 || endptr == NULL) {
+        endptrc = strchr(str, '=');
+        if (value > 3 || endptrc == NULL) {
             return 4;
         }
-        str = endptr + 1;
-        endptr = strchr(str, ',');
-        if (endptr == NULL) {
-            endptr = strchr(str, 0);
+        str = endptrc + 1;
+        endptrc = strchr(str, ',');
+        if (endptrc == NULL) {
+            endptrc = strchr(str, 0);
         }
-        if (endptr - str != 32) {
+        if (endptrc - str != 32) {
             return 5;
         }
         entry->policy[value] = calloc(32 + 1, 1);
         strncpy(entry->policy[value], str, 32);
         entry->policy[value][32] = 0;
-        if (*endptr == 0) {
+        if (*endptrc == 0) {
             break;
         }
-        for (str = endptr + 1; *str == ' ' || *str == '\n'; str++);
+        for (str = endptrc + 1; *str == ' ' || *str == '\n'; str++)
+            ;
     }
     return 0;
 }
diff --git a/tools/libs/light/libxl_internal.c 
b/tools/libs/light/libxl_internal.c
index 2941ca0bbd..d70cfed7d8 100644
--- a/tools/libs/light/libxl_internal.c
+++ b/tools/libs/light/libxl_internal.c
@@ -204,7 +204,7 @@ char *libxl__strndup(libxl__gc *gc, const char *c, size_t n)
 
 char *libxl__dirname(libxl__gc *gc, const char *s)
 {
-    char *c = strrchr(s, '/');
+    const char *c = strrchr(s, '/');
 
     if (!c)
         return NULL;
--
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