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MSVC: don't opt into dyndep support

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Instead, just set the variables for how scanning works since that is
part of the compiler mechanisms.

Fixes: #24198
This commit is contained in:
Ben Boeckel
2022-11-28 17:56:17 -05:00
parent 90907c8ff9
commit 12e4bc73cb
3 changed files with 4 additions and 2 deletions
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2
.gitlab/ci/cxx_modules_rules_msvc.cmake
View File

@@ -1 +1,3 @@
set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)

3
Help/dev/experimental.rst
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@@ -41,7 +41,8 @@ to tell CMake how to invoke the C++20 module dependency scanning tool.
MSVC 19.34 (provided with Visual Studio 17.4) and above contains the support
that CMake needs and has these variables already set up as required and only
the UUID variable needs to be set.
the UUID and the ``CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP`` variables need to be
set.
For example, add code like the following to a test project:

1
Modules/Compiler/MSVC-CXX.cmake
View File

@@ -79,7 +79,6 @@ elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
endif()
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "19.34")
set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
string(CONCAT CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE
"<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> <SOURCE> -nologo -TP"
" -showIncludes"