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69 lines
3.1 KiB
CMake
69 lines
3.1 KiB
CMake
# The PCH that dolphin uses for MSVC is non-standard;
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# Instead of having one PCH per module, dolphin has one PCH shared between all modules.
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# So we need to implement PCH manually, rather than using the PCH support built into cmake
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# linking against this interface libary will cause targets to enable PCH
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add_library(use_pch INTERFACE)
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# Uncomment this return to disable PCH
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#return()
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add_library(build_pch pch.h pch.cpp)
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# fmt/format.h is included in the PCH
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target_link_libraries(build_pch PUBLIC fmt::fmt)
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# pch.cpp should be compiled with the /Yc command, which creates the precompiled header
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target_compile_options(build_pch PRIVATE /Ycpch.h)
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# /Fp sets the location of the PCH. By forcing it to a fixed location, all modules
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# will share this one PCH. We give it a fixed name so we can depend on it later
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target_compile_options(build_pch PUBLIC /Fp$<TARGET_FILE_DIR:build_pch>/dolphin.pch )
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# Sharing a PCH breaks pdb files. So we use the /Z7 option to inline the pdb into
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# the binary. However MSVC gets noisy if you set both /Zi and /Z7
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if (POLICY CMP0141)
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# CMake 3.25 has a policy that makes us control this somewhat sanely
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set_property(TARGET build_pch PROPERTY MSVC_DEBUG_INFORMATION_FORMAT "$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>")
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# Unfortnually, properties don't propagate. So we also set it globally via parent scope
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set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>" PARENT_SCOPE)
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else()
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if (CMAKE_CXX_FLAGS_DEBUG MATCHES "/Zi")
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# Otherwise we do an ugly string replace to remove it from FLAGS_DEBUG
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string(REPLACE "/Zi" "/Z7" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
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string(REPLACE "/Zi" "/Z7" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
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# and also overwrite the version in the parent scope
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set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}" PARENT_SCOPE)
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set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}" PARENT_SCOPE)
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target_compile_options(build_pch PUBLIC "$<$<CONFIG:Debug,RelWithDebInfo>:/Z7>")
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endif()
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endif()
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# Setting /Z7 also requires us to disable minimal rebuilds.
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target_compile_options(build_pch PUBLIC "$<$<CONFIG:Debug,RelWithDebInfo>:/Gm->")
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# To get this working with ninja, we need to tell it that compiling pch.cpp generates an extra output
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set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/pch.cpp PROPERTIES
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OBJECT_OUTPUTS $<TARGET_FILE_DIR:build_pch>/dolphin.pch
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)
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# and then create a custom target that depends on the pch output
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# so that ninja won't start building anything that depends on this
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# target before the pch is built
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add_custom_target(force_build_pch
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DEPENDS $<TARGET_FILE_DIR:build_pch>/dolphin.pch
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)
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# link the pch into anything that depends on use_pch
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target_link_libraries(use_pch INTERFACE build_pch)
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# targets which use the pch need these compile options
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# /Yu - Use precompiled header named "pch.h"
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# /FI - Force include "pch.h" at top of every source file
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target_compile_options(use_pch INTERFACE /Yupch.h /FIpch.h)
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# For ninja, we need to depend on force_build_pch
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add_dependencies(use_pch force_build_pch)
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