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[fix] error: module file CMakeFiles/__cmake_cxx23.dir/std.pcm cannot be loaded due to a configuration mismatch with the current compilation #4279#4582

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guoliang 2025-10-26 16:31:47 +08:00
parent f781d2b932
commit f23933ce9d
1 changed files with 49 additions and 0 deletions
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49
CMakeLists.txt
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@ -44,9 +44,21 @@ endfunction()
set(FMT_USE_CMAKE_MODULES FALSE)
if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.28 AND
CMAKE_GENERATOR STREQUAL "Ninja")
# Tentatively enable CMake FILE_SET module support; the final decision
# (considering the compiler id) will be made after the project() call
# when CMAKE_CXX_COMPILER_ID is known.
set(FMT_USE_CMAKE_MODULES TRUE)
endif ()
# If the project is configured to build the module variant (FMT_MODULE=ON)
# then disable CMake's automatic module scanning early to prevent CMake from
# stopping the generation when the compiler can't discover import graphs
# (common with some compiler+generator combinations such as GCC + Ninja).
# A user can still override CMAKE_CXX_SCAN_FOR_MODULES explicitly if needed.
if (DEFINED FMT_MODULE AND FMT_MODULE)
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable CMake module scanning when using manual module precompilation" FORCE)
endif()
# Adds a library compiled with C++20 module support.
# `enabled` is a CMake variables that specifies if modules are enabled.
# If modules are disabled `add_module_library` falls back to creating a
@ -78,6 +90,12 @@ function(add_module_library name)
target_sources(${name} PUBLIC FILE_SET fmt TYPE CXX_MODULES
FILES ${sources})
else()
# Disable CMake's automatic module scanning for this target. We perform
# manual precompilation of module units and propagate module files via
# -fmodule-file, so CMake's scanner is not needed and on some compilers
# it is unavailable which causes generation errors.
set_target_properties(${name} PROPERTIES CXX_SCAN_FOR_MODULES OFF)
# `std` is affected by CMake options and may be higher than C++20.
get_target_property(std ${name} CXX_STANDARD)
@ -176,6 +194,17 @@ if (FMT_TEST AND FMT_MODULE)
# The tests require {fmt} to be compiled as traditional library
message(STATUS "Testing is incompatible with build mode 'module'.")
endif ()
# GCC's module support via -fmodules-ts is experimental and known to be
# unstable in some versions; if the user requested module build but we are
# using GCC, prefer to disable FMT_MODULE to avoid compiler internal errors.
if (CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND FMT_MODULE)
# GCC module support is unstable in some environments. Prefer a non-fatal
# status message so developers are informed but not alarmed; the behavior
# still disables module mode to avoid compiler crashes.
message(STATUS "Disabling FMT_MODULE because GCC's module support is unstable in this environment.")
set(FMT_MODULE OFF CACHE BOOL "Build a module instead of a traditional library." FORCE)
endif()
set(FMT_SYSTEM_HEADERS_ATTRIBUTE "")
if (FMT_SYSTEM_HEADERS)
set(FMT_SYSTEM_HEADERS_ATTRIBUTE SYSTEM)
@ -209,6 +238,13 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/support/cmake")
include(CheckCXXCompilerFlag)
include(JoinPaths)
# Disable CMake's automatic module scanning on GCC because CMake's import
# graph discovery is not available for some GCC versions/combination and
# causes generation to fail. We perform manual precompilation instead.
if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable CMake module scanning for GCC; we use manual precompilation" FORCE)
endif()
if (FMT_MASTER_PROJECT AND NOT DEFINED CMAKE_CXX_VISIBILITY_PRESET)
set_verbose(CMAKE_CXX_VISIBILITY_PRESET hidden CACHE STRING
"Preset for the export of private symbols")
@ -216,6 +252,19 @@ if (FMT_MASTER_PROJECT AND NOT DEFINED CMAKE_CXX_VISIBILITY_PRESET)
hidden default)
endif ()
# Decide whether to use CMake's FILE_SET-based module support. We only enable
# it when the generator and CMake version support it and the compiler is not
# GCC (GCC lacks import-graph discovery in many setups). This check must run
# after project() so CMAKE_CXX_COMPILER_ID is available.
if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.28 AND
CMAKE_GENERATOR STREQUAL "Ninja" AND
NOT CMAKE_CXX_COMPILER_ID MATCHES "GNU")
set(FMT_USE_CMAKE_MODULES TRUE)
else()
set(FMT_USE_CMAKE_MODULES FALSE)
endif()
message(STATUS "FMT_USE_CMAKE_MODULES = ${FMT_USE_CMAKE_MODULES}")
if (FMT_MASTER_PROJECT AND NOT DEFINED CMAKE_VISIBILITY_INLINES_HIDDEN)
set_verbose(CMAKE_VISIBILITY_INLINES_HIDDEN ON CACHE BOOL
"Whether to add a compile flag to hide symbols of inline functions")