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Optionally exclude implicit link directories via environment

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A misconfigured compiler may pass extraneous implicit link directories
to its linker.  If they are in `CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES`,
CMake may generate extra `-L` flags on mixed-language link lines that
break linking.  Add an environment variable that users can set to work
around such misconfiguration of their compilers.
This commit is contained in:
Brad King
2023-05-25 11:59:26 -04:00
parent cf7b7600c6
commit 023de565d3
7 changed files with 54 additions and 1 deletions
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7
Help/variable/CMAKE_LANG_IMPLICIT_LINK_DIRECTORIES.rst
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@@ -6,9 +6,14 @@ Implicit linker search path detected for language ``<LANG>``.
Compilers typically pass directories containing language runtime
libraries and default library search paths when they invoke a linker.
These paths are implicit linker search directories for the compiler's
language. For each language enabled by the :command:`project` or
language.
For each language enabled by the :command:`project` or
:command:`enable_language` command, CMake automatically detects these
directories and reports the results in this variable.
The :envvar:`CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES_EXCLUDE` environment
variable may be set to exclude specific directories from the automatically
detected results.
When linking to a static library, CMake adds the implicit link directories
from this variable for each language used in the static library (except