From 768b7855c86c4f46b605183ae9451e9af64ca288 Mon Sep 17 00:00:00 2001
From: "Emilio G. Cota" <cota@braap.org>
Date: Wed, 29 Apr 2015 13:09:02 +0200
Subject: configure: require __thread support

The codebase doesn't build without __thread support.
Formalise this requirement by adding a check for it in the
configure script.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index 75a4def8b5..40bc49a29f 100755
--- a/configure
+++ b/configure
@@ -1556,6 +1556,17 @@ if test "$static" = "yes" ; then
   fi
 fi
 
+# Unconditional check for compiler __thread support
+  cat > $TMPC << EOF
+static __thread int tls_var;
+int main(void) { return tls_var; }
+EOF
+
+if ! compile_prog "-Werror" "" ; then
+    error_exit "Your compiler does not support the __thread specifier for " \
+	"Thread-Local Storage (TLS). Please upgrade to a version that does."
+fi
+
 if test "$pie" = ""; then
   case "$cpu-$targetos" in
     i386-Linux|x86_64-Linux|x32-Linux|i386-OpenBSD|x86_64-OpenBSD)
-- 
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