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CXXModules: add a variable for BMI-only compilation

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This will be required when dealing with imported targets which contain
modules.
This commit is contained in:
Ben Boeckel
2022-11-21 13:36:47 -05:00
parent 80d6544398
commit 80ef50a191
4 changed files with 9 additions and 0 deletions
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1
.gitlab/ci/cxx_modules_rules_gcc.cmake
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@@ -17,3 +17,4 @@ string(CONCAT CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG
" -fdeps-format=p1689r5"
# Force C++ as a language.
" -x c++")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG "-fmodule-only")

6
Help/dev/experimental.rst
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@@ -99,6 +99,10 @@ dependencies to the file specified by the ``<DYNDEP_FILE>`` placeholder. The
``CMAKE_EXPERIMENTAL_CXX_SCANDEP_DEPFILE_FORMAT`` file may be set to ``msvc``
for scandep rules which use ``msvc``-style dependency reporting.
In order to support ``IMPORTED`` targets with associated C++20 module sources,
the ``CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG`` variable must be provided
to have the compiler only output a BMI instead of a BMI and an object file.
The module dependencies should be written in the format described
by the `P1689r5`_ paper.
@@ -113,6 +117,8 @@ For compilers that generate module maps, tell CMake as follows:
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "gcc")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG
"${compiler_flags_for_module_map} -fmodule-mapper=<MODULE_MAP_FILE>")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG
"-fmodule-only")
Currently, the only supported formats are, ``clang``, ``gcc``, and ``msvc``.
The ``gcc`` format is described in the GCC documentation, but the relevant

1
Modules/Compiler/Clang-CXX.cmake
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@@ -43,5 +43,6 @@ if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
" > <DYNDEP_FILE>")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "clang")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG "@<MODULE_MAP_FILE>")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG "--precompile")
endif()
endif()

1
Modules/Compiler/MSVC-CXX.cmake
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@@ -87,4 +87,5 @@ if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "19.34")
set(CMAKE_EXPERIMENTAL_CXX_SCANDEP_DEPFILE_FORMAT "msvc")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FORMAT "msvc")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_MAP_FLAG "@<MODULE_MAP_FILE>")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_BMI_ONLY_FLAG "-ifcOnly;-ifcOutput;<OBJECT>")
endif ()