From 5b8ec08d57fa932b769e590ecfe6a471910c05ec Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Mon, 8 Sep 2014 10:21:18 +0200
Subject: build: Detect compiler (gcc or clang) and filter out compiler flags

Create a make variable $(COMPILER) which is set to either `gcc' or
`clang' depending on the compiler used. Use this variable to filter out
command line options not supported by clang (for now only
-fno-delete-null-pointer-checks).

Compiler detection snippet extracted from the Linux kernel Makefile.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
---
 Makefile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 72f0585..90387ab 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,16 @@ else
   DEBUG := 0
 endif
 
+# Compiler detection
+ifneq ($(CC),)
+ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
+COMPILER := clang
+else
+COMPILER := gcc
+endif
+export COMPILER
+endif
+
 # For packaging purposes, you might want to call your own:
 #   make CFLAGS="<flags>"
 CFLAGS_DEF  = -std=gnu99
@@ -83,7 +93,9 @@ endif
 CFLAGS_DEF += -fomit-frame-pointer
 CFLAGS_DEF += -fno-strict-aliasing
 CFLAGS_DEF += -fasynchronous-unwind-tables
+ifneq ($(COMPILER), clang)
 CFLAGS_DEF += -fno-delete-null-pointer-checks
+endif
 
 CFLAGS_MIN  = -D_REENTRANT
 CFLAGS_MIN += -D_LARGEFILE_SOURCE
-- 
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