[PATCH 1 of 7] fuzz: expand variables by make

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1527999082 -32400
#      Sun Jun 03 13:11:22 2018 +0900
# Node ID 04b1b9799d2bf67135d4394476418324e074b408
# Parent  16f93a3b8b05aae9391f26a8b908bfa716456757
fuzz: expand variables by make

Otherwise it wouldn't work unless CC and CXX were exported from the
environment.

diff --git a/contrib/fuzz/Makefile b/contrib/fuzz/Makefile
--- a/contrib/fuzz/Makefile
+++ b/contrib/fuzz/Makefile
@@ -1,46 +1,49 @@
+CC = clang
+CXX = clang++
+
 fuzzutil.o: fuzzutil.cc fuzzutil.h
-	$$CXX $$CXXFLAGS -g -O1 -fsanitize=fuzzer-no-link,address \
+	$(CXX) $(CXXFLAGS) -g -O1 -fsanitize=fuzzer-no-link,address \
 	  -std=c++17 \
 	  -I../../mercurial -c -o fuzzutil.o fuzzutil.cc
 
 fuzzutil-oss-fuzz.o: fuzzutil.cc fuzzutil.h
-	$$CXX $$CXXFLAGS -std=c++17 \
+	$(CXX) $(CXXFLAGS) -std=c++17 \
 	  -I../../mercurial -c -o fuzzutil-oss-fuzz.o fuzzutil.cc
 
 bdiff.o: ../../mercurial/bdiff.c
-	$$CC $$CFLAGS -fsanitize=fuzzer-no-link,address -c -o bdiff.o \
+	$(CC) $(CFLAGS) -fsanitize=fuzzer-no-link,address -c -o bdiff.o \
 	  ../../mercurial/bdiff.c
 
 bdiff: bdiff.cc bdiff.o fuzzutil.o
-	$$CXX $$CXXFLAGS -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
+	$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
 	  -std=c++17 \
 	  -I../../mercurial bdiff.cc bdiff.o fuzzutil.o -o bdiff
 
 bdiff-oss-fuzz.o: ../../mercurial/bdiff.c
-	$$CC $$CFLAGS -c -o bdiff-oss-fuzz.o ../../mercurial/bdiff.c
+	$(CC) $(CFLAGS) -c -o bdiff-oss-fuzz.o ../../mercurial/bdiff.c
 
 bdiff_fuzzer: bdiff.cc bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o
-	$$CXX $$CXXFLAGS -std=c++17 -I../../mercurial bdiff.cc \
+	$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial bdiff.cc \
 	  bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
 	  $$OUT/bdiff_fuzzer
 
 x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
-	$$CC -g -O1 -fsanitize=fuzzer-no-link,address -c \
+	$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c \
 	  -o $@ \
 	  $<
 
 xdiff: xdiff.cc xdiffi.o xprepare.o xutils.o fuzzutil.o
-	$$CXX $$CXXFLAGS -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
+	$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
 	  -I../../mercurial xdiff.cc \
 	  xdiffi.o xprepare.o xutils.o fuzzutil.o -o xdiff
 
 fuzz-x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
-	$$CC $$CFLAGS -c \
+	$(CC) $(CFLAGS) -c \
 	  -o $@ \
 	  $<
 
 xdiff_fuzzer: xdiff.cc fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o
-	$$CXX $$CXXFLAGS -std=c++17 -I../../mercurial xdiff.cc \
+	$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial xdiff.cc \
 	  fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o \
 	  -lFuzzingEngine -o $$OUT/xdiff_fuzzer