From e5555657ba860f2ac25fb7ef9c921a32c6e70c75 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Thu, 6 Oct 2022 17:19:30 -0700 Subject: meson: Add support for building with precompiled headers This substantially speeds up building for windows, due to the vast amount of headers included via windows.h. A cross build from linux targetting mingw goes from 994.11user 136.43system 0:31.58elapsed 3579%CPU to 422.41user 89.05system 0:14.35elapsed 3562%CPU The wins on windows are similar-ish (but I don't have a system at hand just now for actual numbers). Targetting other operating systems the wins are far smaller (tested linux, macOS, FreeBSD). For now precompiled headers are disabled by default, it's not clear how well they work on all platforms. E.g. on FreeBSD gcc doesn't seem to have working support, but clang does. When doing a full build precompiled headers are only beneficial for targets with multiple .c files, as meson builds a separate precompiled header for each target (so that different compilation options take effect). This commit therefore only changes target with at least two .c files to use precompiled headers. Because this commit adds b_pch=false to the default_options new build directories will have precompiled headers disabled by default, however existing build directories will continue use the default value of b_pch, which is true. Note that using precompiled headers with ccache requires setting CCACHE_SLOPPINESS=pch_defines,time_macros to get hits. Reviewed-by: Peter Eisentraut Reviewed-by: Justin Pryzby Discussion: https://postgr.es/m/CA+hUKG+50eOUbN++ocDc0Qnp9Pvmou23DSXu=ZA6fepOcftKqA@mail.gmail.com Discussion: https://postgr.es/m/c5736f70-bb6d-8d25-e35c-e3d886e4e905@enterprisedb.com Discussion: https://postgr.es/m/20190826054000.GE7005%40paquier.xyz --- contrib/hstore/meson.build | 1 + 1 file changed, 1 insertion(+) (limited to 'contrib/hstore') diff --git a/contrib/hstore/meson.build b/contrib/hstore/meson.build index 2bb26bb772..a2a4ec36cb 100644 --- a/contrib/hstore/meson.build +++ b/contrib/hstore/meson.build @@ -18,6 +18,7 @@ endif hstore = shared_module('hstore', hstore_sources, + c_pch: pch_postgres_h, kwargs: contrib_mod_args, ) contrib_targets += hstore -- cgit v1.2.1