makefile与OS相关的编译器

Question

I have a set of C programs that are generally compiled using gcc in a makefile, but OSX Mavericks now uses clang. What is a good way to test for existing compilers in a makefile and use the appropriate one? Moreover, I would also like to use architecture-dependent optimization flags (eg, for gcc on Linux, I would use -O3, but on OSX I would use -fast; for clang on OSX I would use -Ofast).

Kindest thanks,

Ryan

Answer 1

If you are compiling on MacOS X and Linux then you can put the following in your makefile:

UNAME := $(shell uname)

ifeq ($(UNAME), Darwin)
CFLAGS = -Ofast
endif

ifeq ($(UNAME), Linux)
CFLAGS = -O3
endif

# etc