[Mesa-dev] [PATCH 2/4] configure: avoid setting variables as empty strings

[Emil Velikov]

Recent patch converted our logic to use test -n and test -z.
An emptry string variable (empty_str="") return true for both
thus making the check unreliable.

Fix this by correctly setting the variable when applicable.

Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
---
 configure.ac | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index dfed7f8..6db3c1d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1308,7 +1308,7 @@ AC_ARG_WITH([libclc-path],
    [AS_HELP_STRING([--with-libclc-path],
          [DEPRECATED: See http://dri.freedesktop.org/wiki/GalliumCompute#How_to_Install])],
    [LIBCLC_PATH="$withval"],
-   [LIBCLC_PATH=""])
+   [LIBCLC_PATH=''])
 
 if test -n "$LIBCLC_PATH"; then
    AC_MSG_ERROR([The --with-libclc-path option has been deprecated.
@@ -1321,7 +1321,7 @@ AC_ARG_WITH([clang-libdir],
    [AS_HELP_STRING([--with-clang-libdir],
          [Path to Clang libraries @<:@default=llvm-config --libdir@:>@])],
    [CLANG_LIBDIR="$withval"],
-   [CLANG_LIBDIR=""])
+   [CLANG_LIBDIR=''])
 
 PKG_CHECK_EXISTS([libclc], [have_libclc=yes], [have_libclc=no])
 
@@ -1513,7 +1513,7 @@ AC_ARG_WITH([llvm-prefix],
     [AS_HELP_STRING([--with-llvm-prefix],
         [Prefix for LLVM installations in non-standard locations])],
     [llvm_prefix="$withval"],
-    [llvm_prefix=""])
+    [llvm_prefix=''])
 
 
 # Call this inside ` ` to get the return value.
-- 
1.9.0