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Linker: Generate per-language module -DEF: flags on Windows

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With IntelLLVM on Windows, we link using the compiler driver.
With MSVC on Windows, we invoke the linker directly.  If we
use both in a single build tree, for separate languages,
the value of `CMAKE_LINK_DEF_FILE_FLAG` conflicts.  Add a
per-language `CMAKE_<LANG>_LINK_DEF_FILE_FLAG` variable to
avoid the conflict.  Preserve the language-agnostic variable
for compatibility with projects that reference it.

Fixes: #26005
This commit is contained in:
Brad King
2025-05-28 13:19:21 -04:00
parent 9ffbef62ca
commit 8b710d8264
14 changed files with 48 additions and 11 deletions
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Help/variable/CMAKE_LANG_LINK_DEF_FILE_FLAG.rst
+14
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@@ -0,0 +1,14 @@
CMAKE_<LANG>_LINK_DEF_FILE_FLAG
-------------------------------
.. versionadded:: 4.1
Linker flag to be used to specify a ``.def`` file for dll creation
with the toolchain for language ``<LANG>``.
CMake sets this variable automatically during toolchain inspection by
calls to the :command:`project` or :command:`enable_language` commands.
If the :variable:`!CMAKE_<LANG>_LINK_DEF_FILE_FLAG` variable
is defined, it takes precedence over the language-agnostic
:variable:`CMAKE_LINK_DEF_FILE_FLAG` variable.
Help/variable/CMAKE_LINK_DEF_FILE_FLAG.rst
+6
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@@ -5,3 +5,9 @@ Linker flag to be used to specify a ``.def`` file for dll creation.
The flag will be used to add a ``.def`` file when creating a dll on
Windows; this is only defined on Windows.
CMake sets this variable automatically during toolchain inspection by
calls to the :command:`project` or :command:`enable_language` commands.
If the per-language :variable:`CMAKE_<LANG>_LINK_DEF_FILE_FLAG` variable
is defined, it takes precedence over :variable:`!CMAKE_LINK_DEF_FILE_FLAG`.