On 2/13/13, Steve Kargl <sgk_at_troutmask.apl.washington.edu> wrote: > On Wed, Feb 13, 2013 at 12:18:29AM +0000, b.f. wrote: >> ># cat /etc/make.conf|grep FFLAGS >> >FFLAGS = -O2 -pipe -march=native -mtune=native >> >> Please do _not_ assign flags unconditionally in make.conf. > > FFLAGS is for compiling Fortran. I'm one of the people who > has spent years working/patching gfortran. I think I might > have a better understanding of what options to use with > gfortran than most people. > I know you have, but you are giving advice that is liable to be abused by those who are less experienced. The flags you are adding are not the problem -- it's the way that you are adding them -- specifically, the assignment in the first line of your snippet, if it's applied unconditionally. You should either be appending all of them, or assigning them conditionally, so that they are sure to be assigned only once, or -- preferably -- using another makefile that can't be re-read multiple times during a build (ports/Mk/bsd.port.mk automatically includes several makefiles that can be used for this purpose, if you are building a port). You have been lucky not to trip over this: every couple of months for the last several years I have had to debug errors reported by users that arise from this problem. It is more common with CFLAGS and CXXFLAGS but it can happen with FFLAGS, too. b.Received on Wed Feb 13 2013 - 01:15:09 UTC
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