[Qemu-devel] [PATCH] Quote extra_cflags in config-host.mak

[Gabriel Kerneis <gabriel@kerneis.info>]

The variable extra_cflags needs to be quoted in config-host.mak,
in particular because it might contain parentheses that would
otherwise be interpreted by the shell when reloading the file.

For instance, if one wants to define some attribute with configure:

./configure --extra-cflags="-Dcoroutine_fn='__attribute__((coroutine_fn))'"

A more robust approach would be to escape every variable properly, but
there is no portable equivalent to bash's "printf %q" solution. The
current patch, while not bullet-proof, works well in the common case.

Signed-off-by: Gabriel Kerneis <gabriel@kerneis.info>
---
 configure |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index e989609..23114de 100755
--- a/configure
+++ b/configure
@@ -3681,7 +3681,7 @@ if test "$mingw32" = "no" ; then
   echo "qemu_localstatedir=$local_statedir" >> $config_host_mak
 fi
 echo "qemu_helperdir=$libexecdir" >> $config_host_mak
-echo "extra_cflags=$EXTRA_CFLAGS" >> $config_host_mak
+echo "extra_cflags=\"$EXTRA_CFLAGS\"" >> $config_host_mak
 echo "extra_ldflags=$EXTRA_LDFLAGS" >> $config_host_mak
 echo "qemu_localedir=$qemu_localedir" >> $config_host_mak
 echo "libs_softmmu=$libs_softmmu" >> $config_host_mak
-- 
1.7.10.4