[SeaBIOS] [PATCH] Makefile: Allow to override CPP variable

[Paul Menzel]

Date: Sat, 23 May 2015 16:02:08 +0200

Using the conditional assignment operator `?=` [1] instead of `=` makes
it possible to override the variable `CPP` by using an environment
variable

	$ CPP=cpp-5 make

or directly setting it.

	$ make CPP=cpp-5

[1] https://www.gnu.org/software/make/manual/make.html#Setting

Signed-off-by: Paul Menzel <paulepanter at users.sourceforge.net>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 01cadda..63bff49 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ OBJCOPY=$(CROSS_PREFIX)objcopy
 OBJDUMP=$(CROSS_PREFIX)objdump
 STRIP=$(CROSS_PREFIX)strip
 PYTHON=python
-CPP=cpp
+CPP?=cpp
 IASL:=iasl
 LD32BIT_FLAG:=-melf_i386
 
-- 
2.1.4
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