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meson: Add option for controlling PCH

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In practice it turns out that turning off PCH is pretty
useful when debugging incorrect includes. I didn't want
to add this option initially because of the sheer amount
of copy-pasta that meson requires. But considering that
this is useful and the cost of copying the option a single
time is not too high this seems acceptable.
This commit is contained in:
Sergei Zimmerman 2025-10-08 02:51:19 +03:00
parent fb117e0cac
commit c105846646
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11 changed files with 106 additions and 2 deletions
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8
nix-meson-build-support/common/meson.build
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@ -29,7 +29,11 @@ add_project_arguments(
)
# GCC doesn't benefit much from precompiled headers.
do_pch = cxx.get_id() == 'clang'
if get_option('pch') == 'auto'
do_pch = cxx.get_id() == 'clang'
else
do_pch = get_option('pch') == 'enabled'
endif
# This is a clang-only option for improving build times.
# It forces the instantiation of templates in the PCH itself and
@ -38,7 +42,7 @@ do_pch = cxx.get_id() == 'clang'
# bother checking the version.
# This feature helps in particular with the expensive nlohmann::json template
# instantiations in libutil and libstore.
if cxx.get_id() == 'clang'
if cxx.get_id() == 'clang' and do_pch
add_project_arguments('-fpch-instantiate-templates', language : 'cpp')
endif