Arch Linux

Description:
There seems to be a bug with the shaderc extra package which does not happen when building shaderc-git on the same tag from upstream.

Additional info:
* package version(s)
v2020.5

* config and/or log files etc.
* link to upstream bug report, if any
Not upstream but there are logs in this issue for libplacebo: https://code.videolan.org/videolan/libplacebo/-/issues/149

Steps to reproduce:
Install shaderc extra package
Clone libplacebo master branch, https://code.videolan.org/videolan/libplacebo
Compile:
* DIR=./build
* meson $DIR
* meson configure $DIR -Dvulkan=enabled -Dtests=true -Ddebug=true
* ninja -C build test

libplacebo builds but the vulkan test fails:
[0.227][e] shaderc output:
input:48: error: 'subgroup op' : requires SPIR-V 1.3
input:49: error: 'subgroup op' : requires SPIR-V 1.3
input:50: error: 'subgroup op' : requires SPIR-V 1.3

[0.227][e] shaderc compile status 'error' (3 errors, 0 warnings)


However if I replace shaderc with the AUR shaderc-git package (built with 'git+https://github.com/google/shaderc.git#tag=v2020.5')
The same libplacebo test does not fail.

So somehow there's a difference between the extra shaderc v2020.5 and shaderc-git v2020.5.