[Buildroot] [PATCH] toochain/wrapper: fix potential bug in foreach loop

[Yann E. MORIN]

In Makefile, the comma ',' is used to separate the arguments passed to
functions, so we should not be allowed to use straight commas in strings
we want to expand.

For the toolchain wrapper, we need to transform a list:
    -mfoo -mbar -mbuz

into something acceptable for a C array assignment:
    "-mfoo", "-mbar", "-mbuz",

So, we use a $(foreach ...) loop for that. However, we do have a
straight comma in there.

It does not cause any issue in practice, since $(foreach) is a make
builtin function that accepts three and only three parameters.

However, this is not sane.

Change the straight comma to the usual $(comma) expansion, like we sould
do for a call to any other function.

At the same time, make the code a bit easier to read, by first creating
the transformed list, and then creating the define.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Cc: Arnout Vandecappelle <arnout at mind.be>
---
 toolchain/toolchain-wrapper.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk
index eba2b38..af39071 100644
--- a/toolchain/toolchain-wrapper.mk
+++ b/toolchain/toolchain-wrapper.mk
@@ -14,7 +14,9 @@ TOOLCHAIN_WRAPPER_ARGS += -DBR_SYSROOT='"$(STAGING_SUBDIR)"'
 
 # We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a
 # separate argument when used in execv() by the toolchain wrapper.
-TOOLCHAIN_WRAPPER_ARGS += -DBR_ADDITIONAL_CFLAGS='$(foreach f,$(call qstrip,$(BR2_TARGET_OPTIMIZATION)),"$(f)",)'
+TOOLCHAIN_WRAPPER_OPTS = \
+	$(foreach f,$(call qstrip,$(BR2_TARGET_OPTIMIZATION)),"$(f)"$(comma))
+TOOLCHAIN_WRAPPER_ARGS += -DBR_ADDITIONAL_CFLAGS='$(TOOLCHAIN_WRAPPER_OPTS)'
 
 ifeq ($(BR2_CCACHE),y)
 TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE
-- 
1.9.1