From fe35971d2f240898e01a38752c14398ebee2ac7a Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Fri, 11 Feb 2022 22:23:42 +0100
Subject: Build: Instantiate templates during PCH generation with clang 11+
 (this should make PCH more effective in reducing compile times, closer to
 MSVC)

---
 cmake/compiler/clang/settings.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'cmake')

diff --git a/cmake/compiler/clang/settings.cmake b/cmake/compiler/clang/settings.cmake
index 1fe89542a84..2b6e998d854 100644
--- a/cmake/compiler/clang/settings.cmake
+++ b/cmake/compiler/clang/settings.cmake
@@ -150,3 +150,13 @@ if(BUILD_SHARED_LIBS)
 
   message(STATUS "Clang: Disallow undefined symbols")
 endif()
+
+# speedup PCH builds by forcing template instantiations during PCH generation
+set(CMAKE_REQUIRED_FLAGS "-fpch-instantiate-templates")
+check_cxx_source_compiles("int main() { return 0; }" CLANG_HAS_PCH_INSTANTIATE_TEMPLATES)
+unset(CMAKE_REQUIRED_FLAGS)
+if(CLANG_HAS_PCH_INSTANTIATE_TEMPLATES)
+  target_compile_options(trinity-compile-option-interface
+    INTERFACE
+      -fpch-instantiate-templates)
+endif()
-- 
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