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backport-356300-to-release-24.11
nixpkgs/doc/hooks/waf.section.md
Alyssa Ross 67641d0589 wafHook: don't add cross compilation flags 
These flags are not part of waf, they're custom flags that are not
widely implemented.  More packages are broken because of these flags
being added than actually recognise them.

Of the packages in Nixpkgs that directly depend on wafHook that we can
attempt to cross compile (i.e. all their dependencies cross compile),
5 already successfully cross compile and recognise these flags, 2
already successfully cross compile because they have been opted out of
these flags, 3 don't cross compile successfully for reasons unrelated
to these flags, and for the remaining 7, the only thing stopping them
cross compiling successfully is that they are being passed these flags
that they don't recognise.

All of the five successfully cross-compiling packages that do
recognise these flags are samba projects: ldb, talloc, tdb, tevent,
and samba4.  So this isn't a general waf convention, just a samba one.
It therefore doesn't make sense to set these flags by default.  They
should just be included in the expressions for each samba project,
like all the other quirks common to samba build systems.

This change fixes cross compilation of the following packages:

  blockhash ganv ndn-cxx mda_lv2 pflask raul saldl
2024-05-15 16:47:16 +02:00

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wafHook

Waf is a Python-based software building system.

In Nixpkgs, wafHook overrides the default configure, build, and install phases.

Variables controlling wafHook

wafHook Exclusive Variables

The variables below are exclusive of wafHook.

wafPath

Location of the waf tool. It defaults to ./waf, to honor software projects that include it directly inside their source trees.

If wafPath doesn't exist, then wafHook will copy the waf provided from Nixpkgs to it.

wafFlags

Controls the flags passed to waf tool during build and install phases. For settings specific to build or install phases, use wafBuildFlags or wafInstallFlags respectively.

dontUseWafConfigure

When set to true, don't use the predefined wafConfigurePhase.

dontUseWafBuild

When set to true, don't use the predefined wafBuildPhase.

dontUseWafInstall

When set to true, don't use the predefined wafInstallPhase.

Similar variables

The following variables are similar to their stdenv.mkDerivation counterparts.

wafHook Variable stdenv.mkDerivation Counterpart
wafConfigureFlags configureFlags
wafConfigureTargets configureTargets
wafBuildFlags buildFlags
wafBuildTargets buildTargets
wafInstallFlags installFlags
wafInstallTargets installTargets

Honored variables

The following variables commonly used by stdenv.mkDerivation are honored by wafHook.

  • prefixKey
  • enableParallelBuilding
  • enableParallelInstalling