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Cleanup CMake even more #99

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e22405b
Cleanup CMakeLists.txt
Febbe Nov 26, 2025
8d25cc8
Be more strict, regarding project specific options, when build as sub…
Febbe Nov 26, 2025
5cb7749
Update README.md
Febbe Mar 19, 2026
6247a9a
Update README.md
Febbe Mar 23, 2026
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69 changes: 26 additions & 43 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,76 +1,59 @@
cmake_minimum_required(VERSION 3.10 FATAL_ERROR)

project(winflexbison VERSION 2.5.25 LANGUAGES C)
cmake_minimum_required(VERSION 3.21.0)

# cmake 3.31+ - enable `install` destination paths normalization.
if(POLICY CMP0177)
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cmake_policy(SET CMP0177 OLD)
endif()

project(winflexbison VERSION 2.5.25 LANGUAGES C)
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if(NOT MSVC)
message(WARNING "Only Visual Studio Build is officially supported right now")
endif()

add_definitions(-D_CRT_SECURE_NO_WARNINGS)

if(CMAKE_BUILD_TYPE STREQUAL "Debug")
add_definitions(-D_DEBUG)
endif()

# next line needed for compile in C (nor CPP) mode (ucrt headers bug)
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add_definitions(-Dinline=__inline)
# next line needed for VS2017 only
add_definitions(-Drestrict=__restrict)

set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /W3 /MD /Od /Zi /EHsc")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /W3 /GL /Od /Oi /Gy /Zi /EHsc")

# Define Release by default
set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Build type")

# Only apply to MSVC frontend (not clang frontends)
# Make __extension__ expand to nothing on MSVC (so GCC/Clang keeps the keyword)
if (MSVC AND NOT CMAKE_C_COMPILER_ID STREQUAL "Clang")
# Make __extension__ expand to nothing on MSVC (so GCC/Clang keep the keyword)
add_compile_definitions("__extension__=")
add_compile_definitions("__extension__=")
endif()

# Only change those variables for top-level project else use parent values
if(PROJECT_IS_TOP_LEVEL)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/bin")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/bin")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELWITHDEBINFO "${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/bin")
Comment on lines +31 to +33

@jonnysoe jonnysoe Mar 19, 2026

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I haven't experimented this myself, why separate them, is the single CMAKE_RUNTIME_OUTPUT_DIRECTORY not working for some reason?

@Febbe Febbe Mar 19, 2026

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There is no reason, it was separated before I refactored it and was too tired to see that. Good catch.

if(MSVC AND DEFINED USE_STATIC_RUNTIME)
# Legacy compatibility for top-level builds
option(WINFLEXBISON_USE_STATIC_RUNTIME "Set ON to change /MD(DLL) to /MT(static)" USE_STATIC_RUNTIME)
endif()
endif()

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
# Output Variables
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${CMAKE_CURRENT_LIST_DIR}/bin/Debug")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE "${CMAKE_CURRENT_LIST_DIR}/bin/Release")

#------------------------------------------------------------------------
# Static Windows Runtime
# Option to statically link to the Windows runtime. Maybe only
# applies to WIN32/MSVC.
#------------------------------------------------------------------------
if (MSVC)
add_compile_options("/source-charset:utf-8")
option( USE_STATIC_RUNTIME "Set ON to change /MD(DLL) to /MT(static)" OFF )
if (USE_STATIC_RUNTIME)
set(CompilerFlags
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_DEBUG
CMAKE_CXX_FLAGS_RELEASE
CMAKE_C_FLAGS
CMAKE_C_FLAGS_DEBUG
CMAKE_C_FLAGS_RELEASE
)
foreach(CompilerFlag ${CompilerFlags})
string(REPLACE "/MD" "/MT" ${CompilerFlag} "${${CompilerFlag}}")
endforeach()
message(STATUS "Using /MT STATIC runtime")
endif ()
if (MSVC)
add_compile_options("/source-charset:utf-8")
option(WINFLEXBISON_USE_STATIC_RUNTIME "Set ON to change /MD(DLL) to /MT(static)" Off)

@jonnysoe jonnysoe Mar 19, 2026

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This multiple option for WINFLEXBISON_USE_STATIC_RUNTIME will be a nightmare for maintenance, preferable to consolidate them into a single variable before setting it

@jonnysoe jonnysoe Mar 19, 2026

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And also, don't expect anyone to dig through the PRs, please add a comments around the need for WINFLEXBISON_USE_STATIC_RUNTIME, I don't really know why at a glance, like its to prevent name clash with other code base that pull this in as a dependency if they use USE_STATIC_RUNTIME but we use this name previously so older scripts we missed will still work, etc.

if (WINFLEXBISON_USE_STATIC_RUNTIME)
# /MT or /MTd depending on config
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
else ()
# /MD or /MDd depending on config
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
endif ()
endif ()



add_subdirectory(common)
add_subdirectory(flex)
add_subdirectory(bison)

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
if(PROJECT_IS_TOP_LEVEL)
# CPACK
if(CMAKE_BUILD_TYPE STREQUAL "Debug")
install(DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG}/" DESTINATION "./")
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17 changes: 17 additions & 0 deletions README.md
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Expand Up @@ -32,6 +32,23 @@ The release page includes the full Changelog but you may also see the [changelog
* Visual Studio 2017 or newer
* CMake

* Clang-cl or Visual Studio 2017 and newer
* CMake
* Ninja (optional, recommended)
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## Build instructions Visual Studio 15 2017

mkdir CMakeBuildVS2017
cd CMakeBuildVS2017
cmake .. -G "Visual Studio 15 2017"
cmake --build . --config "Release" --target package

## Build instructions clang-cl

mkdir CMakeBuildClangCl
cd CMakeBuildClangCl
cmake .. -G"Ninja Multi-Config" -DCMAKE_C_COMPILER=clang-cl.exe
cmake --build . --config "Release" --target package
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## HowTo

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2 changes: 1 addition & 1 deletion bison/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
cmake_minimum_required(VERSION 3.21.0)

project(win_bison LANGUAGES C)

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2 changes: 1 addition & 1 deletion common/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
cmake_minimum_required(VERSION 3.21.0)

project(winflexbison_common LANGUAGES C)

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2 changes: 1 addition & 1 deletion flex/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
cmake_minimum_required(VERSION 3.21.0)

project(win_flex LANGUAGES C)

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