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-rw-r--r--Help/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.rst7
1 files changed, 6 insertions, 1 deletions
diff --git a/Help/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.rst b/Help/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.rst
index cc80851..e361fd9 100644
--- a/Help/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.rst
+++ b/Help/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.rst
@@ -6,4 +6,9 @@ Directories implicitly searched by the compiler for header files.
CMake does not explicitly specify these directories on compiler
command lines for language ``<LANG>``. This prevents system include
directories from being treated as user include directories on some
-compilers.
+compilers, which is important for ``C``, ``CXX``, and ``CUDA`` to
+avoid overriding standard library headers.
+
+This value is not used for ``Fortran`` because it has no standard
+library headers and some compilers do not search their implicit
+include directories for module ``.mod`` files.