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49 lines
2.0 KiB
CMake
49 lines
2.0 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$<TARGET_FILE_DIR:build_pch>/dolphin.pch )
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# Sharing a PCH breaks pdb files. So we use the /Z7 option to inline the pdb into
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# the binary. That also requires us to disable minimal rebuilds.
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target_compile_options(build_pch PUBLIC /Z7 /Gm-)
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# To get this working with ninja, we need to tell it that compiling pch.cpp generates an extra output
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set_source_files_properties(${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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