From a2dcfcf9972f8e240e990bf1235a862f3f14e4db Mon Sep 17 00:00:00 2001
From: Hayden Kowalchuk <hayden@hkowsoftware.com>
Date: Mon, 9 Dec 2019 12:07:49 -0500
Subject: [PATCH] fix: detect gcc version

---
 Makefile | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index b24acae..ac987bd 100644
--- a/Makefile
+++ b/Makefile
@@ -14,9 +14,15 @@ OBJS += containers/stack.o containers/named_array.o containers/aligned_vector.o
 SUBDIRS =
 
 EXTRA_CFLAGS=  -Wall -Wextra 
-KOS_CFLAGS += -ffast-math -O2 -funroll-loops -fsingle-precision-constant -Iinclude -funsafe-math-optimizations -DBUILD_LIBGL $(EXTRA_CFLAGS)
+GCC5_FLAGS =
+GCCVERSIONGTEQ4 := $(shell expr `sh-elf-gcc -dumpversion | cut -f1 -d.` \>= 5)
+
+ifeq "$(GCCVERSIONGTEQ4)" "1"
+    GCC5_FLAGS += -mfsca -mfsrra -mlra
+endif
+KOS_CFLAGS += -ffast-math -O2 -funroll-loops -fsingle-precision-constant -Iinclude -funsafe-math-optimizations -funit-at-a-time -DBUILD_LIBGL $(EXTRA_CFLAGS) $(GCC5_FLAGS)
 #KOS_CFLAGS += -O1 -mlra -Iinclude -DBUILD_LIBGL -Wall -Wextra
-#GCC5_FLAGS = -mfsca -mfsrra -mlra
+
 
 # Manipulate the CFLAGS to look our *our* version of the library and includes
 INC_DIR = $(abspath ./include)
@@ -24,12 +30,12 @@ LIB_DIR = $(abspath ./)
 export CFLAGS := $(CFLAGS) -I $(INC_DIR)
 export OBJEXTRA := $(LIB_DIR)/libGLdc.a
 
-default: build link
+default: link
 
-link:
+link: build
 	$(KOS_AR) rcs $(TARGET) $(OBJS)
 
-build: $(OBJS) link
+build: $(OBJS) 
 
 samples: build
 	$(KOS_MAKE) -C samples all