determing architecture in a makefile

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Level 1

78 points

determing architecture in a makefile

I have a program that I'd like to build on both intel and ppc Macs running Leopard.

I'd like to have my makefile handle the job. I tried to determine the architecture by ..

ARCH = $(if $(findstring i386,$(MACHTYPE)),i386,powerpc)

But within the makefile MACHTYPE is empty. From the terminal, I get what I'd expect.

$ echo $MACHTYPE
i386-apple-darwin9.0

My eventual goal is to define a library for g95

FLIB = -L/sw/lib/gcc-lib/$(ARCH)-apple-darwin9/4.0.3/ -lf95

If anyone can help, I'd appreciate it.

TiA

Intel MacBook Pro, G4 Powerbook, Mac OS X (10.5.7)

Posted on Aug 4, 2009 7:36 PM

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Answer 1

Aug 4, 2009 7:52 PM in response to Ben Abbott1

It doesn't seem to be defined as an actual environment variable nor does it seem to be accurate.

Apple's generally recommended procedures are outlined here:

http://devworld.apple.com/DOCUMENTATION/Porting/Conceptual/PortingUnix/compiling /compiling.html#//apple_ref/doc/uid/TP40002850-BAJCFEBA

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Answer 2

Ben Abbott1 Author

Level 1

78 points

Aug 4, 2009 7:59 PM in response to Learning Annex Certified

I'd prefer to avoid the whole "configure" thing.

What do you mean by

It doesn't seem to be defined as an actual environment variable nor does it seem to be accurate.

As MACHTYPE is definitely an environment variable on both my intel and ppc based laptops, I assume you refer to something else?

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Answer 3

Aug 4, 2009 8:06 PM in response to Ben Abbott1

Try printenv. See it listed?

http://toxicsoftware.com/bashweirdness_on_mac_os_x_intelboxes1/

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Answer 4

Jun T.

Level 4

2,185 points

Aug 4, 2009 8:07 PM in response to Ben Abbott1

MACHTYPE is not defined on my iMac.

You can use


ARCH=$(uname -p)
or
ARCH=$(arch)

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Answer 5

Ben Abbott1 Author

Level 1

78 points

Aug 4, 2009 8:14 PM in response to Jun T.

I like you suggestion but when I try setting ARCH by ...

ARCH=$(uname -p)

in my makefile, the makefile variable ARCH is empty.

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Answer 6

Ben Abbott1 Author

Level 1

78 points

Aug 4, 2009 8:20 PM in response to Learning Annex Certified

Ok, I see your point; "printenv MACHTYPE" doesn't show anything.

So what is happening whe I run "echo $MACHTYPE"?

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Answer 7

etresoft

Level 8

46,134 points

Aug 4, 2009 8:30 PM in response to Ben Abbott1

Why not just build both architectures?

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Answer 8

Ben Abbott1 Author

Level 1

78 points

Aug 4, 2009 8:33 PM in response to etresoft

I'm compiling a mex-file for Matlab. Matlab is not a universal app. Also, I don't have the necessary libraries for both architectures on one machine.

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Answer 9

Jun T.

Level 4

2,185 points

Aug 4, 2009 8:43 PM in response to Ben Abbott1

Sorry I was confusing with shell scripts.

In Makefile, you can use


ARCH = $(shell uname -p)
ARCH = $(shell uname -m)
ARCH = $(shell arch)

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Answer 10

Ben Abbott1 Author

Level 1

78 points

Aug 4, 2009 8:44 PM in response to Ben Abbott1

Jun,

I did some reading and found I could get your suggestion working by ...

ARCH := $(shell uname -p)

Thanks

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Answer 11

BobHarris

Level 9

53,075 points

Aug 5, 2009 6:07 AM in response to Ben Abbott1

MACHTYPE is a bash shell local variable. make only sees environment variables

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