From: Ondřej Surý <ondrej@sury.org>
Date: Wed, 19 Jun 2019 09:21:36 +0000 (+0200)
Subject: Enforce usage -zrelax=transtls when GNU C Compiler is used on Solaris
X-Git-Tag: v9.15.2~23^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d584223653e17930109f37f5203acecca4090ca6;p=thirdparty%2Fbind9.git

Enforce usage -zrelax=transtls when GNU C Compiler is used on Solaris

When GNU C Compiler is used on Solaris (11), the Thread Local Storage
is completely broken.  The behaviour doesn't manifest when GNU ld is
used.  Thus, we need to enforce usage of GNU ld when GNU C Compiler is
the compiler of choice.

For more background for this change, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90912
---

diff --git a/configure b/configure
index dfce44b5706..50c2bacdca1 100755
--- a/configure
+++ b/configure
@@ -13405,6 +13405,23 @@ fi
 
 
 
+#
+# Using Solaris linker with gcc on Solaris breaks Thread Local Storage
+#
+case $host in #(
+  *-solaris*) :
+
+	    if test "$GCC" = "yes"; then :
+  LDFLAGS="$LDFLAGS -zrelax=transtls"
+		   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: When using GNU C Compiler on Solaris, -zrelax=transtls linker flag is used to fix bug in Thread Local Storage" >&5
+$as_echo "$as_me: WARNING: When using GNU C Compiler on Solaris, -zrelax=transtls linker flag is used to fix bug in Thread Local Storage" >&2;}
+
+fi
+	 ;; #(
+  *) :
+     ;;
+esac
+
 #
 # CCNOOPT defaults to -O0 on gcc and disables optimization when is last
 #
diff --git a/configure.ac b/configure.ac
index 714b501d0a0..3058a33eb94 100644
--- a/configure.ac
+++ b/configure.ac
@@ -326,6 +326,17 @@ esac
 AC_PROG_CC
 AC_PROG_CC_C99
 
+#
+# Using Solaris linker with gcc on Solaris breaks Thread Local Storage
+#
+AS_CASE([$host],
+	[*-solaris*],[
+	    AS_IF([test "$GCC" = "yes"],
+		  [LDFLAGS="$LDFLAGS -zrelax=transtls"
+		   AC_MSG_WARN([When using GNU C Compiler on Solaris, -zrelax=transtls linker flag is used to fix bug in Thread Local Storage])
+		  ])
+	])
+
 #
 # CCNOOPT defaults to -O0 on gcc and disables optimization when is last
 #