From: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Date: Fri, 5 Nov 2021 14:37:33 +0000 (+0100)
Subject: libstdc++: only define _GLIBCXX_HAVE_TLS for VxWorks >= 6.6
X-Git-Tag: basepoints/gcc-13~3300
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc6b8cd9a21b363815998b11e5cc7529557a9ce5;p=thirdparty%2Fgcc.git

libstdc++: only define _GLIBCXX_HAVE_TLS for VxWorks >= 6.6

According to
https://gcc.gnu.org/legacy-ml/gcc-patches/2008-03/msg01698.html, the
TLS support, including the __tls_lookup function, was added to VxWorks
in 6.6.

It certainly doesn't exist on our VxWorks 5 platform, but the fallback
code in eh_globals.cc using __gthread_key_create() etc. used to work
just fine.

libstdc++-v3/ChangeLog:

	* config/os/vxworks/os_defines.h (_GLIBCXX_HAVE_TLS): Only
	define for VxWorks >= 6.6.
---

diff --git a/libstdc++-v3/config/os/vxworks/os_defines.h b/libstdc++-v3/config/os/vxworks/os_defines.h
index c881b2b4b9e3..75a68bc605b3 100644
--- a/libstdc++-v3/config/os/vxworks/os_defines.h
+++ b/libstdc++-v3/config/os/vxworks/os_defines.h
@@ -45,8 +45,10 @@
 #define _GLIBCXX_USE_WEAK_REF 0
 #endif
 
-// We support TLS on VxWorks (either directly or with emutls)
+// We support TLS on VxWorks >= 6.6 (either directly or with emutls)
+#if !_VXWORKS_PRE(6, 6)
 #define _GLIBCXX_HAVE_TLS 1
+#endif
 
 // VxWorks7 comes with a DinkumWare library and the system headers which we
 // are going to include for libstdc++ have a few related intrinsic