configure: avoid setting variables as empty strings
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@gmail.com>
diff --git a/configure.ac b/configure.ac
index 1688aae..2c24a59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1313,7 +1313,7 @@
[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.
@@ -1326,7 +1326,7 @@
[AS_HELP_STRING([--with-clang-libdir],
[Path to Clang libraries @<:@default=llvm-config --libdir@:>@])],
[CLANG_LIBDIR="$withval"],
- [CLANG_LIBDIR=""])
+ [CLANG_LIBDIR=''])
PKG_CHECK_EXISTS([libclc], [have_libclc=yes], [have_libclc=no])
@@ -1518,7 +1518,7 @@
[AS_HELP_STRING([--with-llvm-prefix],
[Prefix for LLVM installations in non-standard locations])],
[llvm_prefix="$withval"],
- [llvm_prefix=""])
+ [llvm_prefix=''])
# Call this inside ` ` to get the return value.