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Code Issues 150 Wiki Activity

build Windows with clang-cl instead of MSVC

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clang-cl keeps the MSVC ABI, so the Windows SDK, the vcpkg packages and
D3D12 all still link; only the front end changes. That front end is the
one whose module support has been giving way - global module fragment
merging and type completeness at a template's instantiation point.

Switches the job to Ninja, which is where CMake's module scanning is best
supported, with vcvars64 for the SDK paths. Ninja is single-config, so
the artifacts move from build/bin/<config>/ to build/bin/.

CMakeLists: the MSVC-only blocks tested CMAKE_CXX_COMPILER_ID, which
clang-cl reports as Clang, so the version resource, the icon and /utf-8
would have been dropped silently. They test MSVC now, which is true for
both. /MAP and /MP stay behind a real-MSVC check - the first is a
link.exe spelling, the second clang-cl rejects.
This commit is contained in:
maj00r
2026-09-10 13:35:35 +02:00
parent 96161dcacb
commit 7daf200748
2 changed files with 57 additions and 31 deletions
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29
CMakeLists.txt
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@@ -17,9 +17,10 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/CMake_modules/")
set(DEPS_DIR ${DEPS_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/ref")
project("eu07")
# Clang is the only compiler this project is built and tested with on Linux
# (Clang 22 in CI); MSVC covers Windows. GCC is not supported: its lazy loading
# of module interfaces is broken here, and working around it costs roughly twice
# Clang is the compiler this project is built and tested with: clang on Linux,
# clang-cl on Windows, both pinned to 22 in CI. MSVC still configures and is not
# rejected, but nothing verifies it. GCC is not supported: its lazy loading of
# module interfaces is broken here, and working around it costs roughly twice
# the memory per compiler process.
if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang|MSVC")
message(FATAL_ERROR
@@ -444,7 +445,12 @@ set(GLM_INCLUDE_DIR ${GLM_INCLUDE_DIR} "${DEPS_DIR}/glm/")
configure_file(${CMAKE_SOURCE_DIR}/eu07.rc.in
${CMAKE_BINARY_DIR}/eu07.rc @ONLY)
if (${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
# MSVC is true for clang-cl as well - it targets the same ABI and takes the same
# command line. Testing CMAKE_CXX_COMPILER_ID instead would silently drop the
# version resource and the icon from a clang-cl build.
if (MSVC)
# the Visual Studio generators enable RC on their own; Ninja does not
enable_language(RC)
set(SOURCES ${SOURCES} ${CMAKE_BINARY_DIR}/eu07.rc)
set(SOURCES ${SOURCES} eu07.ico)
add_compile_options("/utf-8")
@@ -508,18 +514,23 @@ target_include_directories(${PROJECT_NAME} PRIVATE
"${CMAKE_BINARY_DIR}/geninc"
"${GLOBAL_INCLUDE_DIR}")
if (${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
if (MSVC)
# override cmake defaults
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO " /MD /Zi /O2 /DNDEBUG")
set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO " /DEBUG /INCREMENTAL:NO /OPT:REF /OPT:ICF")
target_link_options(${PROJECT_NAME} PRIVATE "/MAP")
# /wd4996: disable "deprecation" warnings
# /wd4244: disable warnings for conversion with possible loss of data
# /wd5033: disable because it is all over Python headers
set_target_properties(${PROJECT_NAME} PROPERTIES COMPILE_FLAGS "/wd4996 /wd4244 /wd5033")
set_target_properties(${PROJECT_NAME} PROPERTIES LINK_FLAGS "/LARGEADDRESSAWARE")
# /MAP is a link.exe option; lld-link, which clang-cl usually drives, spells
# it differently. The map only feeds the debug-symbols artifact, whose upload
# tolerates it being absent.
if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
target_link_options(${PROJECT_NAME} PRIVATE "/MAP")
endif()
endif()
set_target_properties( ${PROJECT_NAME}
@@ -724,7 +735,9 @@ if(GENERATE_PDB)
endif()
endif()
if(ENABLE_MCC AND MSVC)
# /MP is an MSVC-only option; clang-cl rejects it, and under Ninja the generator
# already runs one compiler process per core.
if(ENABLE_MCC AND CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND NOT CMAKE_GENERATOR MATCHES "Ninja")
message(STATUS "Enabling multi-processor compilation for MSVC.")
add_compile_options(/MP)
endif()