[xen staging-4.18] tools/libxl: remove usage of VLA arrays

[patchbot@xxxxxxx]

commit af98d03997d78aba243666cc144fa5137b3bf2f0
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Oct 28 12:48:31 2024 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Apr 11 17:27:59 2025 +0100

    tools/libxl: remove usage of VLA arrays
    
    Clang 19 complains with the following error when building libxl:
    
    libxl_utils.c:48:15: error: variable length array folded to constant array 
as an extension [-Werror,-Wgnu-folding-constant]
       48 |     char path[strlen("/local/domain") + 12];
          |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    Replace the usage of strlen() with sizeof, which allows the literal
    string length to be known at build time.  Note sizeof accounts for the
    NUL terminator while strlen() didn't, hence subtract 1 from the total
    size calculation.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    (cherry picked from commit a7c7c3f6424504c4004bbb3437be319aa41ad580)
---
 tools/libs/light/libxl_utils.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_utils.c b/tools/libs/light/libxl_utils.c
index 65ef196935..7fd9b177b3 100644
--- a/tools/libs/light/libxl_utils.c
+++ b/tools/libs/light/libxl_utils.c
@@ -45,7 +45,7 @@ unsigned long libxl_get_required_shadow_memory(unsigned long 
maxmem_kb, unsigned
 char *libxl_domid_to_name(libxl_ctx *ctx, uint32_t domid)
 {
     unsigned int len;
-    char path[strlen("/local/domain") + 12];
+    char path[sizeof("/local/domain") + 11];
     char *s;
 
     snprintf(path, sizeof(path), "/local/domain/%d/name", domid);
@@ -141,7 +141,7 @@ int libxl_cpupool_qualifier_to_cpupoolid(libxl_ctx *ctx, 
const char *p,
 char *libxl_cpupoolid_to_name(libxl_ctx *ctx, uint32_t poolid)
 {
     unsigned int len;
-    char path[strlen("/local/pool") + 12];
+    char path[sizeof("/local/pool") + 11];
     char *s;
 
     snprintf(path, sizeof(path), "/local/pool/%d/name", poolid);
--
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