Test for >= gcc 4, and change to g99 -std=gnu99 for the compiler if it is found.

diff --git a/Makefile b/Makefile
index 8a306139bed5163fa9799cc654781cf8d942723c..7526a71d8d0c426d570a6ddbe1eebd081cb9d90e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,10 @@ UNAME_S := $(shell uname -s)
 ifeq ($(UNAME_S),Darwin)
        LIBS=
 endif
+GCCVERSIONGTEQ4 := $(shell expr `gcc -dumpversion | cut -f1 -d.` \>= 4)
+ifeq "$(GCCVERSIONGTEQ4)" "1"
+       CC=c99 --std=gnu99
+endif
 
 OBJS=main.o init.o actions1.o actions2.o score.o misc.o database.o
 SOURCES=$(OBJS:.o=.c) COPYING NEWS README TODO advent.text control