commit 39c2cb2e93e2acc75a5eb6dd91d81f79c787acd5
author Denys Vlasenko <vda.linux@googlemail.com> Thu Mar 08 00:20:01 2012 +0100
committer Denys Vlasenko <vda.linux@googlemail.com> Thu Mar 08 00:20:01 2012 +0100
tree d4d381a2df3b8ec565813b87cbd8c82586d3df6b
parent bf6343796e834183ff1b0c1b9416676e8488afa5

build system: fix broken CONFIG_SYSROOT handling

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

Makefile.flags

diff --git a/Makefile.flags b/Makefile.flags
index 68dfa57..92aae6f 100644
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -104,7 +104,9 @@
 LDLIBS += m
 endif
 
-ifneq ($(CONFIG_SYSROOT),)
+# Note: both "" (string consisting of two quote chars) and empty string
+# are possible, and should be skipped below.
+ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
 CFLAGS += --sysroot=$(CONFIG_SYSROOT)
 export SYSROOT=$(CONFIG_SYSROOT)
 endif