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-rw-r--r--Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst31
1 files changed, 30 insertions, 1 deletions
diff --git a/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst b/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
index 87a9d06..e0ee979 100644
--- a/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
+++ b/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
@@ -8,11 +8,40 @@ CMAKE_SYSTEM_PREFIX_PATH
subdirectories (like ``bin``, ``lib``, or ``include``) as specified in its own
documentation.
-By default this contains the standard directories for the current system, the
+By default this contains the system directories for the current system, the
:variable:`CMAKE_INSTALL_PREFIX`, and the :variable:`CMAKE_STAGING_PREFIX`.
The installation and staging prefixes may be excluded by setting
the :variable:`CMAKE_FIND_NO_INSTALL_PREFIX` variable.
+The system directories that are contained in ``CMAKE_SYSTEM_PREFIX_PATH`` are
+locations that typically include installed software. An example being
+``/usr/local`` for UNIX based platforms. In addition to standard platform
+locations, CMake will also add values to ``CMAKE_SYSTEM_PREFIX_PATH`` based on
+environment variables. The environment variables and search locations that
+CMake uses may evolve over time, as platforms and their conventions also
+evolve. The following provides an indicative list of environment variables
+and locations that CMake searches, but they are subject to change:
+
+
+CrayLinuxEnvironment:
+ * ``ENV{SYSROOT_DIR}/``
+ * ``ENV{SYSROOT_DIR}/usr``
+ * ``ENV{SYSROOT_DIR}/usr/local``
+
+Darwin:
+ * ``ENV{SDKROOT}/usr`` When ``CMAKE_OSX_SYSROOT`` is not explicitly specified.
+
+OpenBSD:
+ * ``ENV{LOCALBASE}``
+
+Windows:
+ * ``ENV{ProgramW6432}``
+ * ``ENV{ProgramFiles}``
+ * ``ENV{ProgramFiles(x86)}``
+ * ``ENV{SystemDrive}/Program Files``
+ * ``ENV{SystemDrive}/Program Files (x86)``
+
+
``CMAKE_SYSTEM_PREFIX_PATH`` is *not* intended to be modified by the project;
use :variable:`CMAKE_PREFIX_PATH` for this.