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From: Michael Roth <mdroth@linux.vnet.ibm.com>
Date: Thu, 24 May 2012 13:52:40 -0500
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Subject: [Qemu-devel] [PATCH 1/2] configure: check if environ is declared
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To: qemu-devel@nongnu.org
Cc: aliguori@us.ibm.com, lcapitulino@redhat.com

From: Luiz Capitulino <lcapitulino@redhat.com>

Some systems may declare environ automatically, others don't. Check for it.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 configure |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index b55a792..1f338f8 100755
--- a/configure
+++ b/configure
@@ -2831,6 +2831,21 @@ if compile_prog "" "" ; then
     linux_magic_h=yes
 fi
 
+########################################
+# check if environ is declared
+
+has_environ=no
+cat > $TMPC << EOF
+#include <unistd.h>
+int main(void) {
+    environ = environ;
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+    has_environ=yes
+fi
+
 ##########################################
 # End of CC checks
 # After here, no more $cc or $ld runs
@@ -3342,6 +3357,10 @@ if test "$linux_magic_h" = "yes" ; then
   echo "CONFIG_LINUX_MAGIC_H=y" >> $config_host_mak
 fi
 
+if test "$has_environ" = "yes" ; then
+  echo "CONFIG_HAS_ENVIRON=y" >> $config_host_mak
+fi
+
 # USB host support
 case "$usb" in
 linux)
-- 
1.7.4.1