Haiku paths support

[X547]

This patch set correct install path used by Haiku operating system (https://www.haiku-os.org/). Currently Haiku use after install Bash scripts to adjust install locations to Haiku native ones, but it is a hack and native Meson support would be preferred.

Background:

Haiku (and its descendent BeOS) use its own file system hierarchy that significantly differs from other UNIX-like systems. There are four install prefixes recognized by system:

1. $HOME/config/non-packaged
2. $HOME/config
3. /boot/system/non-packaged
4. /boot/non-packaged

/boot is a mount point of a volume containing currently booted system installation (something like C: in Windows, not boot loader data as in Linux). non-packaged directories means software not managed by package manager and installed manually (such as ninja install).

All development-related files such as pkg-config *.pc files, C/C++ headers, static libraries, symbolic links to dynamic libraries, compilers etc. should be installed to $prefix/develop directory.

Summary:

Command	Haiku path
prefix	/boot/system/non-packaged
bindir	bin
datadir	data
includedir	develop/headers
infodir	documentation/info
libdir	lib (runtime), develop/lib (static libraries, symlinks for compiler use)
libexecdir	lib
localedir	data/locale
mandir	documentation/man
sbindir	bin
sysconfdir	settings
pkgconfig	develop/lib/pkgconfig, data/pkgconfig

Example install layout:

> tree install
install
├── develop
│   ├── headers
│   │   ├── EGL
│   │   │   ├── egl.h
│   │   │   ├── eglext.h
│   │   │   └── eglplatform.h
│   │   ├── GL
│   │   │   ├── gl.h
│   │   │   ├── glcorearb.h
│   │   │   └── glext.h
│   │   ├── GLES
│   │   │   ├── egl.h
│   │   │   ├── gl.h
│   │   │   ├── glext.h
│   │   │   └── glplatform.h
│   │   ├── GLES2
│   │   │   ├── gl2.h
│   │   │   ├── gl2ext.h
│   │   │   └── gl2platform.h
│   │   ├── GLES3
│   │   │   ├── gl3.h
│   │   │   ├── gl31.h
│   │   │   ├── gl32.h
│   │   │   ├── gl3ext.h
│   │   │   └── gl3platform.h
│   │   ├── glvnd
│   │   │   ├── GLdispatchABI.h
│   │   │   ├── libeglabi.h
│   │   │   └── libglxabi.h
│   │   ├── KHR
│   │   │   └── khrplatform.h
│   │   └── opengl
│   │       ├── GLRenderer.h
│   │       ├── GLView.h
│   │       └── OpenGLKit.h
│   └── lib
│       ├── libEGL.so -> ../../lib/libEGL.so.1
│       ├── libGL.so -> ../../lib/libGL.so.1
│       ├── libGLdispatch.so -> ../../lib/libGLdispatch.so.0
│       ├── libGLESv1_CM.so -> ../../lib/libGLESv1_CM.so.1
│       ├── libGLESv2.so -> ../../lib/libGLESv2.so.2
│       ├── libOpenGL.so -> ../../lib/libOpenGL.so.0
│       └── pkgconfig
│           ├── egl.pc
│           ├── gl.pc
│           ├── glesv1_cm.pc
│           ├── glesv2.pc
│           ├── libglvnd.pc
│           └── opengl.pc
└── lib
    ├── libEGL.so.1 -> libEGL.so.1.1.0
    ├── libEGL.so.1.1.0
    ├── libGL.so.1 -> libGL.so.1.0.0
    ├── libGL.so.1.0.0
    ├── libGLdispatch.so.0 -> libGLdispatch.so.0.0.0
    ├── libGLdispatch.so.0.0.0
    ├── libGLESv1_CM.so.1 -> libGLESv1_CM.so.1.2.0
    ├── libGLESv1_CM.so.1.2.0
    ├── libGLESv2.so.2 -> libGLESv2.so.2.1.0
    ├── libGLESv2.so.2.1.0
    ├── libOpenGL.so.0 -> libOpenGL.so.0.0.0
    └── libOpenGL.so.0.0.0

Patch do not correctly handle symlinks to dynamic libraries used by compiler yet.

[tristan957]

Everything looks alright to me other than my 2 comments, 1 of which might not actually be actionable.

[tristan957]

Appreciate your upstreaming :)

[tristan957]

Should you also change default_libdir()?

[X547]

Should you also change default_libdir()?

Default value lib is fine for Haiku runtime lib directory. Static libraries and compiler symlinks to shared libraries should be installed to develop/lib, but it can't be achieved with setting default_libdir() value and need some deeper changes (I would be appreciated to hear advices how to implement it).

[tristan957]

It would also be nice if you updated the docs to mention Haiku support. Perhaps we need a more expressive way to do https://mesonbuild.com/Builtin-options.html#directories if anyone has any ideas. Maybe the same table, but add columns for Default | Windows | Haiku with a comment about default being overridden on certain platforms. Just a thought.

Release notes snippet would be good to.

[eli-schwartz]

Can you rebase this?

[codecov]

Codecov Report

Merging #11310 (66b5955) into master (dd83d5e) will decrease coverage by 0.53%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master   #11310      +/-   ##
==========================================
- Coverage   68.87%   68.35%   -0.53%     
==========================================
  Files         414      414              
  Lines       90234    90284      +50     
  Branches    20694    20709      +15     
==========================================
- Hits        62153    61711     -442     
- Misses      23409    23960     +551     
+ Partials     4672     4613      -59     

Impacted Files	Coverage Δ
mesonbuild/modules/pkgconfig.py	85.90% <0.00%> (-0.58%)	⬇️
mesonbuild/utils/universal.py	78.34% <48.57%> (-0.83%)	⬇️
mesonbuild/coredata.py	84.00% <100.00%> (-0.04%)	⬇️
mesonbuild/interpreterbase/decorators.py	91.10% <100.00%> (+0.02%)	⬆️
mesonbuild/optinterpreter.py	77.94% <100.00%> (+3.79%)	⬆️
modules/cuda.py	0.00% <0.00%> (-72.65%)	⬇️
templates/cudatemplates.py	37.50% <0.00%> (-62.50%)	⬇️
compilers/cuda.py	19.63% <0.00%> (-45.40%)	⬇️
dependencies/cuda.py	20.19% <0.00%> (-42.79%)	⬇️
compilers/detect.py	43.79% <0.00%> (-3.05%)	⬇️
... and 11 more

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