From b6e229a13aebfbb3fe38c216fd51b68bf71cfa9c Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 20 Feb 2015 09:40:59 +0000
Subject: [PATCH] export CPP

The OE environment sets and exports CPP as being the target gcc. When
building gcc-cross-canadian for a mingw targetted sdk, the following can be found
in build.x86_64-pokysdk-mingw32.i586-poky-linux/build-x86_64-linux/libiberty/config.log:

configure:3641: checking for _FILE_OFFSET_BITS value needed for large files
configure:3666: gcc  -c -isystem/media/build1/poky/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe  conftest.c >&5
configure:3666: $? = 0
configure:3698: result: no
configure:3786: checking how to run the C preprocessor
configure:3856: result: x86_64-pokysdk-mingw32-gcc -E --sysroot=/media/build1/poky/build/tmp/sysroots/x86_64-nativesdk-mingw32-pokysdk-mingw32
configure:3876: x86_64-pokysdk-mingw32-gcc -E --sysroot=/media/build1/poky/build/tmp/sysroots/x86_64-nativesdk-mingw32-pokysdk-mingw32 conftest.c
configure:3876: $? = 0

Note this is a *build* target (in build-x86_64-linux) so it should be
using the host "gcc", not x86_64-pokysdk-mingw32-gcc. Since the mingw32
headers are very different, using the wrong cpp is a real problem. It is leaking
into configure through the CPP variable. Ultimately this leads to build
failures related to not being able to include a process.h file for pem-unix.c.

The fix is to ensure we export a sane CPP value into the build
environment when using build targets. We could define a CPP_FOR_BUILD value which may be
the version which needs to be upstreamed but for now, this fix is good enough to
avoid the problem.

RP 22/08/2013

Upstream-Status: Pending

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 Makefile.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile.in b/Makefile.in
index 047be0255e2..af19589fa95 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -149,6 +149,7 @@ BUILD_EXPORTS = \
 	AR="$(AR_FOR_BUILD)"; export AR; \
 	AS="$(AS_FOR_BUILD)"; export AS; \
 	CC="$(CC_FOR_BUILD)"; export CC; \
+	CPP="$(CC_FOR_BUILD) -E"; export CPP; \
 	CFLAGS="$(CFLAGS_FOR_BUILD)"; export CFLAGS; \
 	CONFIG_SHELL="$(SHELL)"; export CONFIG_SHELL; \
 	CXX="$(CXX_FOR_BUILD)"; export CXX; \
