8 files changed, 46 insertions, 32 deletions
diff --git a/Help/variable/APPLE.rst b/Help/variable/APPLE.rst
index 75eecf1..810d5fc 100644
--- a/Help/variable/APPLE.rst
+++ b/Help/variable/APPLE.rst
@@ -1,6 +1,5 @@
 APPLE
 -----
 
-``True`` if running on OS X.
-
-Set to ``true`` on OS X.
+Set to ``True`` when the target system is an Apple platform
+(macOS, iOS, tvOS or watchOS).
diff --git a/Help/variable/CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES.rst b/Help/variable/CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES.rst
new file mode 100644
index 0000000..80ffce3
--- /dev/null
+++ b/Help/variable/CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES.rst
@@ -0,0 +1,7 @@
+CMAKE_CODEBLOCKS_EXCLUDE_EXTERNAL_FILES
+---------------------------------------
+
+Change the way the CodeBlocks generator creates project files.
+
+If this variable evaluates to ``ON`` the generator excludes from
+the project file any files that are located outside the project root.
diff --git a/Help/variable/CMAKE_FIND_NO_INSTALL_PREFIX.rst b/Help/variable/CMAKE_FIND_NO_INSTALL_PREFIX.rst
index c49d264..789dc99 100644
--- a/Help/variable/CMAKE_FIND_NO_INSTALL_PREFIX.rst
+++ b/Help/variable/CMAKE_FIND_NO_INSTALL_PREFIX.rst
@@ -1,15 +1,19 @@
 CMAKE_FIND_NO_INSTALL_PREFIX
 ----------------------------
 
-Ignore the :variable:`CMAKE_INSTALL_PREFIX` when searching for assets.
+Exclude the values of the :variable:`CMAKE_INSTALL_PREFIX` and
+:variable:`CMAKE_STAGING_PREFIX` variables from
+:variable:`CMAKE_SYSTEM_PREFIX_PATH`.  CMake adds these project-destination
+prefixes to :variable:`CMAKE_SYSTEM_PREFIX_PATH` by default in order to
+support building a series of dependent packages and installing them into
+a common prefix.  Set ``CMAKE_FIND_NO_INSTALL_PREFIX`` to ``TRUE``
+to suppress this behavior.
 
-CMake adds the :variable:`CMAKE_INSTALL_PREFIX` and the
-:variable:`CMAKE_STAGING_PREFIX` variable to the
-:variable:`CMAKE_SYSTEM_PREFIX_PATH` by default. This variable may be set
-on the command line to control that behavior.
+The :variable:`CMAKE_SYSTEM_PREFIX_PATH` is initialized on the first call to a
+:command:`project` or :command:`enable_language` command.  Therefore one must
+set ``CMAKE_FIND_NO_INSTALL_PREFIX`` before this in order to take effect.  A
+user may set the variable as a cache entry on the command line to achieve this.
 
-Set ``CMAKE_FIND_NO_INSTALL_PREFIX`` to ``TRUE`` to tell
-:command:`find_package` not to search in the :variable:`CMAKE_INSTALL_PREFIX`
-or :variable:`CMAKE_STAGING_PREFIX` by default.  Note that the
-prefix may still be searched for other reasons, such as being the same prefix
-as the CMake installation, or for being a built-in system prefix.
+Note that the prefix(es) may still be searched for other reasons, such as being
+the same prefix as the CMake installation, or for being a built-in system
+prefix.
diff --git a/Help/variable/CMAKE_LANG_COMPILER_ID.rst b/Help/variable/CMAKE_LANG_COMPILER_ID.rst
index 5204044..2264269 100644
--- a/Help/variable/CMAKE_LANG_COMPILER_ID.rst
+++ b/Help/variable/CMAKE_LANG_COMPILER_ID.rst
@@ -27,6 +27,7 @@ include:
   NVIDIA = NVIDIA CUDA Compiler (nvidia.com)
   OpenWatcom = Open Watcom (openwatcom.org)
   PGI = The Portland Group (pgroup.com)
+  Flang = Flang Fortran Compiler
   PathScale = PathScale (pathscale.com)
   SDCC = Small Device C Compiler (sdcc.sourceforge.net)
   SunPro = Oracle Solaris Studio (oracle.com)
diff --git a/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst b/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
index e74dfad..38b2f8d 100644
--- a/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
+++ b/Help/variable/CMAKE_SYSTEM_PREFIX_PATH.rst
@@ -10,8 +10,11 @@ documentation.
 
 By default this contains the standard directories for the current system, the
 :variable:`CMAKE_INSTALL_PREFIX`, and the :variable:`CMAKE_STAGING_PREFIX`.
-It is *not* intended to be modified by the project; use
-:variable:`CMAKE_PREFIX_PATH` for this.
+The installation and staging prefixes may be excluded by setting
+the :variable:`CMAKE_FIND_NO_INSTALL_PREFIX` variable.
+
+``CMAKE_SYSTEM_PREFIX_PATH`` is *not* intended to be modified by the project;
+use :variable:`CMAKE_PREFIX_PATH` for this.
 
 See also :variable:`CMAKE_SYSTEM_INCLUDE_PATH`,
 :variable:`CMAKE_SYSTEM_LIBRARY_PATH`, :variable:`CMAKE_SYSTEM_PROGRAM_PATH`,
diff --git a/Help/variable/MSVC_VERSION.rst b/Help/variable/MSVC_VERSION.rst
index 8932147..0a3a7a6 100644
--- a/Help/variable/MSVC_VERSION.rst
+++ b/Help/variable/MSVC_VERSION.rst
@@ -5,13 +5,15 @@ The version of Microsoft Visual C/C++ being used if any.
 
 Known version numbers are::
 
-  1200 = VS  6.0
-  1300 = VS  7.0
-  1310 = VS  7.1
-  1400 = VS  8.0
-  1500 = VS  9.0
-  1600 = VS 10.0
-  1700 = VS 11.0
-  1800 = VS 12.0
-  1900 = VS 14.0
-  1910 = VS 15.0
+  1200      = VS  6.0
+  1300      = VS  7.0
+  1310      = VS  7.1
+  1400      = VS  8.0 (v80 toolset)
+  1500      = VS  9.0 (v90 toolset)
+  1600      = VS 10.0 (v100 toolset)
+  1700      = VS 11.0 (v110 toolset)
+  1800      = VS 12.0 (v120 toolset)
+  1900      = VS 14.0 (v140 toolset)
+  1910-1919 = VS 15.0 (v141 toolset)
+
+See also the  :variable:`CMAKE_<LANG>_COMPILER_VERSION` variable.
diff --git a/Help/variable/UNIX.rst b/Help/variable/UNIX.rst
index 0877b7c..49d8668 100644
--- a/Help/variable/UNIX.rst
+++ b/Help/variable/UNIX.rst
@@ -1,7 +1,7 @@
 UNIX
 ----
 
-``True`` for UNIX and UNIX like operating systems.
-
-Set to ``true`` when the target system is UNIX or UNIX like (i.e.
-:variable:`APPLE` and :variable:`CYGWIN`).
+Set to ``True`` when the target system is UNIX or UNIX-like
+(e.g. :variable:`APPLE` and :variable:`CYGWIN`).  The
+:variable:`CMAKE_SYSTEM_NAME` variable should be queried if
+a more specific understanding of the target system is required.
diff --git a/Help/variable/WIN32.rst b/Help/variable/WIN32.rst
index 2189069..78ab772 100644
--- a/Help/variable/WIN32.rst
+++ b/Help/variable/WIN32.rst
@@ -1,6 +1,4 @@
 WIN32
 -----
 
-``True`` on Windows systems, including Win64.
-
-Set to ``true`` when the target system is Windows.
+Set to ``True`` when the target system is Windows, including Win64.