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From: | Steven G. Johnson |
Subject: | Re: configure sets CFLAGS or how to disable default CFLAGS='-g -O2' for gcc? |
Date: | Tue, 11 Apr 2006 18:06:59 -0400 |
User-agent: | Mozilla Thunderbird 1.0 (Macintosh/20041206) |
Ed Hartnett wrote:
In a similar situation, I first check to see if CFLAGS is set, then only muck with it if it has not been set:
Yes, we do something similar in FFTW.To those on this list who think that configure should never set CFLAGS, realize that optimizing CFLAGS can be very important for high-performance scientific programs and requiring the user to set them is painful and error-prone. (Of course, you want the user to be able to override them if necessary.)
See AX_CC_MAXOPT (http://autoconf-archive.cryp.to/ax_cc_maxopt.html) at the macro archive for the macro that FFTW uses to set its flags depending on the compiler vendor, architecture, etcetera.
Regards, Steven G. Johnson
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