[php-src] PHP-8.4: TSRM: don't use initial-exec on AIX (#23145)

Author: Calvin Buckley (NattyNarwhal)
Committer: GitHub (web-flow)
Pusher: arnaud-lb
Date: 2026-08-11T10:10:29+02:00

Commit: https://github.com/php/php-src/commit/618d99bed4d670039e7bd348110fa8ac10081588
Raw diff: https://github.com/php/php-src/commit/618d99bed4d670039e7bd348110fa8ac10081588.diff

TSRM: don't use initial-exec on AIX (#23145)

If building for ZTS, it seems that local-exec can sneak in:

```
PHP Warning:  PHP Startup: Unable to load dynamic library 'intl' (tried: /QOpenSys/pkgs/lib/php-8.6/extensions/intl (   0509-022 Cannot load module /QOpenSys/pkgs/lib/php-8.6/extensions/intl.
        0509-026 System error: A file or directory in the path name does not exist.), /QOpenSys/pkgs/lib/php-8.6/extensions/intl.so (   0509-130 Symbol resolution failed for /QOpenSys/pkgs/lib/php-8.6/extensions/intl.so because:
        0509-189 Module /QOpenSys/pkgs/lib/php-8.6/extensions/intl.so is loaded dynamically,
                  but the initial-exec model is used by the module
                  to refer to its own thread-local variables.
        0509-191 Examine .loader section relocation entries with the
                 'dump -Rv' command.
        0509-192 Examine .loader section symbols with the
                 'dump -Tv' command.)) in Unknown on line 0
```

When inspecting the module for initial-exec:

```
$ dump -Rv /QOpenSys/pkgs/lib/php-8.6/extensions/intl.so | grep TLS_In
        0x20014370  0x000001fb TLS_InExc      0x0003     _tsrm_ls_cache
```

It seems it only was in `ext/intl/timezone/timezone_class.cpp`. However,
it seems prudent to just not use local-exec for this case since it seems
to be an optimization only really possible on glibc; play it safe
elsewhere. (Perhaps this should be really an ifdef GLIBC check?)

Changed paths:
  M  TSRM/TSRM.h


Diff:

diff --git a/TSRM/TSRM.h b/TSRM/TSRM.h
index 80d6cbad0443..4911233d948f 100644
--- a/TSRM/TSRM.h
+++ b/TSRM/TSRM.h
@@ -152,7 +152,8 @@ TSRM_API bool tsrm_is_managed_thread(void);
 # define __has_attribute(x) 0
 #endif
 
-#if !__has_attribute(tls_model) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__MUSL__) || defined(__HAIKU__)
+#if !__has_attribute(tls_model) || defined(__FreeBSD__) || defined(__NetBSD__) \
+	|| defined(__MUSL__) || defined(__HAIKU__) || defined(_AIX)
 # define TSRM_TLS_MODEL_ATTR
 # define TSRM_TLS_MODEL_DEFAULT
 #elif __PIC__