From 73331eebf885ba8918447d26ba37bef2208bdb5e Mon Sep 17 00:00:00 2001 From: Jake Petroules Date: Tue, 23 Aug 2016 15:16:42 -0700 Subject: Enable precompiled headers on iOS, tvOS, watchOS The actual blocker for precompiled headers is not the iOS/tvOS/watchOS platforms, but the way qmake handled multiple-architecture builds on Apple platforms. This patch allows multi-arch builds to be performed while using precompiled headers. Since df91ef3d6c55692a0236f67b6c6b134a3bf84098 (April 2009), Clang has had support for PCH files in the driver, which allows to use the -include flag to automatically translate to -include-pch. We can then take advantage of the fact that the -include option is allowed to not be separate from its argument, which lets us take advantage of -Xarch to specify a per-architecture precompiled header file. This is done through some magic in the qmake Makefile generator which "multiplexes" the PCH creation rule across multiple architectures and replaces a series of tokens with the proper precompiled header paths and architecture flags at usage point. Change-Id: I76c8dc9cda7e218869c2919f023d9b04f311c6fd Reviewed-by: Oswald Buddenhagen --- mkspecs/features/uikit/default_post.prf | 2 ++ 1 file changed, 2 insertions(+) (limited to 'mkspecs/features/uikit') diff --git a/mkspecs/features/uikit/default_post.prf b/mkspecs/features/uikit/default_post.prf index 52c9b1e8c8..199074eefe 100644 --- a/mkspecs/features/uikit/default_post.prf +++ b/mkspecs/features/uikit/default_post.prf @@ -114,4 +114,6 @@ macx-xcode { QMAKE_CFLAGS += $$arch_flags QMAKE_CXXFLAGS += $$arch_flags QMAKE_LFLAGS += $$arch_flags + + QMAKE_PCH_ARCHS = $$VALID_ARCHS } -- cgit v1.2.3