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  2. vulkan-loader

Re: vulkan-loader

Joel Winarske
 


Before:
$ pkg-config --print-errors --define-variable=prefix=/opt --variable=includedir vulkan
/usr/include

After:
$ pkg-config --print-errors --define-variable=prefix=/opt --variable=includedir vulkan
/opt/usr/include

This is important as meson does not expose
PKG_CONFIG_SYSROOT_DIR to pkg-config.

With change this meson snippet now finds absolute path correctly:
vulkan_dep = dependency('vulkan')
vulkan_hpp = join_paths([
    vulkan_dep.get_pkgconfig_variable('includedir', define_variable: ['prefix', get_option('prefix')]),
    'vulkan',
    'vulkan.hpp'
    ])
Another work around for meson's current limitation would be to implement a pkg-config wrapper that exposes PKG_CONFIG variables, and point to it in meson.bbclass/meson.cross.

Regardless the bad vulkan.pc is now fixed.


Joel


On Mon, Nov 29, 2021, 10:58 PM Alexander Kanavin <alex.kanavin@...> wrote:
Can you show what vulkan.pc contains please, and why is that a problem?

Alex

On Tue, 30 Nov 2021 at 00:51, Joel Winarske <joel.winarske@...> wrote:
I discovered an upstream problem with vulkan-loader today.

Effectively since 1.2.162 vulkan.pc is broken for cross compilation scenarios.

This example illustrates current problem with vulkan.pc installed by vulkan-loader:
$ pkg-config --print-errors --define-variable=prefix=/opt --variable=includedir vulkan
/usr/include

It should return /opt/usr/include

So doing this in a meson project does not produce the expected result:
vulkan_hpp = join_paths([
    vulkan_dep.get_pkgconfig_variable('includedir', define_variable: ['prefix', get_option('prefix')])
    'vulkan',
    'vulkan.hpp'
    ])

What is the suggested approach to address this?  A patch for each branch up to master?

Joel
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