[Qemu-devel] [PATCH for-2.5??] configure: Fix shell syntax to placate OpenBSD's pdksh

[Peter Maydell <peter.maydell@linaro.org>]

Unfortunately the OpenBSD pdksh does not like brackets inside
the right part of a ${variable+word} parameter expansion:

  $ echo "${a+($b)}"
  ksh: ${a+($b)}": bad substitution

though both bash and dash accept them. In any case this line
was causing odd output in the case where nettle is not present:
  nettle    no ()

(because if nettle is not present then $nettle will be "no",
not a null string or unset).

Rewrite it to just use an if.

This bug was originally introduced in becaeb726 and was present
in the 2.4.0 release.

Fixes: https://bugs.launchpad.net/qemu/+bug/1525682
Reported-by: Dmitrij D. Czarkoff
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
This fixes a problem where configure just falls over on OpenBSD,
but on the other hand it is not a regression since 2.4.0...
Opinions on whether we should put it in 2.5 as a last minute
thing welcome.

 configure | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index b9552fd..6ca6c64 100755
--- a/configure
+++ b/configure
@@ -4758,7 +4758,11 @@ echo "GTK GL support    $gtk_gl"
 echo "GNUTLS support    $gnutls"
 echo "GNUTLS hash       $gnutls_hash"
 echo "libgcrypt         $gcrypt"
-echo "nettle            $nettle ${nettle+($nettle_version)}"
+if test "$nettle" = "yes"; then
+    echo "nettle            $nettle ($nettle_version)"
+else
+    echo "nettle            $nettle"
+fi
 echo "libtasn1          $tasn1"
 echo "VTE support       $vte"
 echo "curses support    $curses"
-- 
1.9.1