From d76f4ef91a2b456cd18174b7a98e7426b4adfc63 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Mon, 23 Jul 2018 21:51:56 +0200
Subject: make usage of compiler flags more standard compliant

---
 src/Makefile  |  4 ++--
 src/configure | 23 ++++++++++++-----------
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index feccbaa..9ac899a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -80,7 +80,7 @@ all: $(EXECUTABLE)
 
 %.d: %.c
 	@set -e; rm -f $@; \
-  $(CC) -MM $(CFLAGS) $< > $@.$$$$; \
+  $(CC) -MM $(CPPFLAGS) $< > $@.$$$$; \
   sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
   rm -f $@.$$$$; echo '(re)building $@'
 
@@ -92,7 +92,7 @@ $(EXECUTABLE): $(OBJ)
 	$(CC) $(OBJ) -o $@ $(LDFLAGS)
 
 %.o: %.c
-	$(CC) $(CFLAGS) -c $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $<
 
 
 strip: $(EXECUTABLE)
diff --git a/src/configure b/src/configure
index 8044552..4b27e7b 100755
--- a/src/configure
+++ b/src/configure
@@ -16,7 +16,7 @@
 #  tunneling and relaying of packets of any protocol.
 #
 #
-#  Copyright (C) 2007-2014 Christian Pointner <equinox@anytun.org>
+#  Copyright (C) 2007-2017 Christian Pointner <equinox@anytun.org>
 #
 #  This file is part of uAnytun.
 #
@@ -153,12 +153,12 @@ if [ -n "$ERRORS" ] && [ $EBUILD_COMPAT -ne 1 ]; then
 fi
 
 if [ $USE_CLANG -eq 0 ]; then
-  CFLAGS=$CFLAGS'-g -Wall -O2'
-  LDFLAGS=$LDFLAGS'-g -Wall -O2'
+  if [ -z "$CFLAGS" ]; then CFLAGS='-g -Wall -O2'; fi
+  if [ -z "$LDFLAGS" ]; then LDFLAGS='-g -Wall -O2'; fi
   COMPILER='gcc'
 else
-  CFLAGS=$CFLAGS'-g -O2'
-  LDFLAGS=$LDFLAGS'-g -O2'
+  if [ -z "$CFLAGS" ]; then CFLAGS='-g -O2'; fi
+  if [ -z "$LDFLAGS" ]; then LDFLAGS='-g -O2'; fi
   COMPILER='clang'
 fi
 
@@ -174,7 +174,7 @@ case $TARGET in
     rm -f tun.c
     ln -sf bsd/tun.c
     echo "loading BSD specific TUN Device"
-    CFLAGS=$CFLAGS' -I/usr/local/include'
+    CPPFLAGS=$CPPFLAGS' -I/usr/local/include'
     LDFLAGS=$LDFLAGS' -L/usr/local/lib'
   ;;
   *)
@@ -186,22 +186,22 @@ esac
 CRYPTO_LIB_NAME=""
 case $CRYPTO_LIB in
   gcrypt)
-    CFLAGS=$CFLAGS' -DUSE_GCRYPT'
+    CPPFLAGS=$CPPFLAGS' -DUSE_GCRYPT'
     LDFLAGS=$LDFLAGS' -lgcrypt'
     CRYPTO_LIB_NAME="libgcrypt"
   ;;
   nettle)
-    CFLAGS=$CFLAGS' -DUSE_NETTLE'
+    CPPFLAGS=$CPPFLAGS' -DUSE_NETTLE'
     LDFLAGS=$LDFLAGS' -lnettle'
     CRYPTO_LIB_NAME="Nettle"
   ;;
   ssl)
-    CFLAGS=$CFLAGS' -DUSE_SSL_CRYPTO'
+    CPPFLAGS=$CPPFLAGS' -DUSE_SSL_CRYPTO'
     LDFLAGS=$LDFLAGS' -lcrypto'
     CRYPTO_LIB_NAME="OpenSSL"
   ;;
   none)
-    CFLAGS=$CFLAGS' -DNO_CRYPT'
+    CPPFLAGS=$CPPFLAGS' -DNO_CRYPT'
     CRYPTO_LIB_NAME="none"
   ;;
   *)
@@ -212,7 +212,7 @@ esac
 echo "crypto-library: $CRYPTO_LIB_NAME"
 
 if [ $PASSPHRASE -eq 0 ]; then
-  CFLAGS=$CFLAGS' -DNO_PASSPHRASE'
+  CPPFLAGS=$CPPFLAGS' -DNO_PASSPHRASE'
   echo "disabling master key and salt passphrase"
 fi
 
@@ -239,6 +239,7 @@ cat > include.mk <<EOF
 
 TARGET := $TARGET
 CC := $COMPILER
+CPPFLAGS := $CPPFLAGS
 CFLAGS := $CFLAGS
 LDFLAGS := $LDFLAGS
 STRIP := strip
-- 
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