Arch Linux

graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,724

Website

Redefine CFLAGS from /etc/makepkg.conf in PKGBUILD [SOLVED]

I would like to modify a PKGBUILD to redefine both CFLAGS and CXXFLAGS defined in /etc/makepkg,conf and am looking for the most elegant way to do it.  I basically want to take the march value from the Arch default and pass a CPU-specific one to it when I build a particular package locally.  What seems to work fine is to just unset them and redefine them like the below, but I'm wondering if there is a way I can treat them as an array or the like and simply redefine the march value without the unset stuff.  Does that make sense?

...
build() {
 unset CFLAGS CXXFLAGS
 export CFLAGS="-march=haswell -O2 -pipe -fstack-protector-strong -fdiagnostics-color"
 exportCXXFLAGS="${CFLAGS}"
 cd "$pkgname-$pkgver"
 ...

...perhaps a substitution wherein the target is the source... is that strategically flawed?

CFLAGS=${CFLAGS/x86-64/haswell}

Last edited by graysky (2017-05-27 15:42:46)

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AUR packages • Zsh and other configs

Trilby

Inspector Parrot

Registered: 2011-11-29

Posts: 30,438

Website

Re: Redefine CFLAGS from /etc/makepkg.conf in PKGBUILD [SOLVED]

Why do you need to remove anything - just append the value(s) you want.  Gcc will only use the last march specified:

export CFLAGS+=" -march=whatever"

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"UNIX is simple and coherent" - Dennis Ritchie; "GNU's Not Unix" - Richard Stallman

graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,724

Website

Re: Redefine CFLAGS from /etc/makepkg.conf in PKGBUILD [SOLVED]

I didn't realize the last value is the one honored.  Will test to verify and mark when done.  Thanks.

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AUR packages • Zsh and other configs