[ptxdist] [PATCH] flashbench: Fix error when flashbench is not selected

[Bernhard Walle <bernhard@bwalle.de>]

When flashbench is not selected in "ptxdist menuconfig", then
$(PTXCONF_FLASHBENCH_MAX_BUFSIZE) is undefined. In that case, the expr
call fails.

Fix the problem by delaying the evaluation of FLASHBENCH_MAKE_OPT until
it's really needed, i.e. when flashbench has been selected.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
Signed-off-by: Bernhard Walle <walle@corscience.de>
---
 rules/flashbench.make |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rules/flashbench.make b/rules/flashbench.make
index fcb669e..39bdfb6 100644
--- a/rules/flashbench.make
+++ b/rules/flashbench.make
@@ -31,7 +31,10 @@ FLASHBENCH_LICENSE	:= GPL v2
 
 FLASHBENCH_CONF_TOOL	:= NO
 FLASHBENCH_MAKE_ENV	:= $(CROSS_ENV)
-FLASHBENCH_MAKE_OPT	:= CC=$(CROSS_CC) \
+
+# Use '=' instaed of ':=' because $(PTXCONF_FLASHBENCH_MAX_BUFSIZE) is not defined
+# when flashbench is not selected to be built.
+FLASHBENCH_MAKE_OPT	= CC=$(CROSS_CC) \
 	EXTRA_CFLAGS=-DMAX_BUFSIZE=$(shell expr 1024 \* 1024 \* $(PTXCONF_FLASHBENCH_MAX_BUFSIZE))
 
 # ----------------------------------------------------------------------------
-- 
1.7.9.4


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