target gpptest uses CXX environment variable

diff --git a/Makefile b/Makefile
index ac3034c9b7bf6b4c6c3212adce30a8eef1f8b5bb..5e887364af4438d1ebc186b117bfab7dc5e34cdd 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -180,7 +180,7 @@ ppc64fuzz: clean
        CC=powerpc-linux-gnu-gcc QEMU_SYS=qemu-ppc64-static MOREFLAGS="-m64 -static" FUZZER_FLAGS=--no-big-tests $(MAKE) -C $(TESTDIR) fuzztest
 
 gpptest: clean
-       CC=g++ $(MAKE) -C $(PRGDIR) all CFLAGS="-O3 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Werror"
+       CC=$(CXX) $(MAKE) -C $(PRGDIR) all CFLAGS="-O3 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Werror"
 
 gcc5test: clean
        gcc-5 -v