Help: Add a manual for compiler feature control.

Link to it from the documentation of related properties, variables
and commands.

Extend the cmake-developer(7) documentation with notes on
extending feature support for compilers.

8 files changed, 23 insertions, 2 deletions

diff --git a/Help/prop_tgt/COMPILE_FEATURES.rst b/Help/prop_tgt/COMPILE_FEATURES.rst
index dc32825..225ffee 100644
--- a/Help/prop_tgt/COMPILE_FEATURES.rst
+++ b/Help/prop_tgt/COMPILE_FEATURES.rst
@@ -8,4 +8,5 @@ in the :variable:`CMAKE_CXX_COMPILE_FEATURES` variable.
 
 Contents of ``COMPILE_FEATURES`` may use "generator expressions" with the
 syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)` manual for
-available expressions.
+available expressions.  See the :manual:`cmake-compile-features(7)` manual
+for information on compile features.
diff --git a/Help/prop_tgt/CXX_EXTENSIONS.rst b/Help/prop_tgt/CXX_EXTENSIONS.rst
index 770f6ff..d7f87a4 100644
--- a/Help/prop_tgt/CXX_EXTENSIONS.rst
+++ b/Help/prop_tgt/CXX_EXTENSIONS.rst
@@ -7,6 +7,9 @@ This property specifies whether compiler specific extensions should be
 used.  For some compilers, this results in adding a flag such
 as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_CXX_EXTENSIONS` variable if it is set when a target
 is created.
diff --git a/Help/prop_tgt/CXX_STANDARD.rst b/Help/prop_tgt/CXX_STANDARD.rst
index fdd5aac..8f299bb 100644
--- a/Help/prop_tgt/CXX_STANDARD.rst
+++ b/Help/prop_tgt/CXX_STANDARD.rst
@@ -22,6 +22,9 @@ flag will not result in an error or warning, but will instead add the
 ``-std=c++98`` flag if supported.  This "decay" behavior may be controlled
 with the :prop_tgt:`CXX_STANDARD_REQUIRED` target property.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_CXX_STANDARD` variable if it is set when a target
 is created.
diff --git a/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst b/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
index f082805..ac103a4 100644
--- a/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
+++ b/Help/prop_tgt/CXX_STANDARD_REQUIRED.rst
@@ -9,6 +9,9 @@ property is ``OFF`` or unset, the :prop_tgt:`CXX_STANDARD` target property is
 treated as optional and may "decay" to a previous standard if the requested is
 not available.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_CXX_STANDARD_REQUIRED` variable if it is set when a
 target is created.
diff --git a/Help/prop_tgt/C_EXTENSIONS.rst b/Help/prop_tgt/C_EXTENSIONS.rst
index b0c5c4c..0772ecc 100644
--- a/Help/prop_tgt/C_EXTENSIONS.rst
+++ b/Help/prop_tgt/C_EXTENSIONS.rst
@@ -7,6 +7,9 @@ This property specifies whether compiler specific extensions should be
 used.  For some compilers, this results in adding a flag such
 as ``-std=gnu11`` instead of ``-std=c11`` to the compile line.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_C_EXTENSIONS` variable if it is set when a target
 is created.
diff --git a/Help/prop_tgt/C_STANDARD.rst b/Help/prop_tgt/C_STANDARD.rst
index 9fdc0bb..a0c939a 100644
--- a/Help/prop_tgt/C_STANDARD.rst
+++ b/Help/prop_tgt/C_STANDARD.rst
@@ -22,6 +22,9 @@ flag will not result in an error or warning, but will instead add the
 ``-std=c99`` or ``-std=c90`` flag if supported.  This "decay" behavior may
 be controlled with the :prop_tgt:`C_STANDARD_REQUIRED` target property.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_C_STANDARD` variable if it is set when a target
 is created.
diff --git a/Help/prop_tgt/C_STANDARD_REQUIRED.rst b/Help/prop_tgt/C_STANDARD_REQUIRED.rst
index 6c39e96..a7304f4 100644
--- a/Help/prop_tgt/C_STANDARD_REQUIRED.rst
+++ b/Help/prop_tgt/C_STANDARD_REQUIRED.rst
@@ -9,6 +9,9 @@ property is ``OFF`` or unset, the :prop_tgt:`C_STANDARD` target property is
 treated as optional and may "decay" to a previous standard if the requested is
 not available.
 
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features.
+
 This property is initialized by the value of
 the :variable:`CMAKE_C_STANDARD_REQUIRED` variable if it is set when a
 target is created.
diff --git a/Help/prop_tgt/INTERFACE_COMPILE_FEATURES.rst b/Help/prop_tgt/INTERFACE_COMPILE_FEATURES.rst
index a98e362..7abdecb 100644
--- a/Help/prop_tgt/INTERFACE_COMPILE_FEATURES.rst
+++ b/Help/prop_tgt/INTERFACE_COMPILE_FEATURES.rst
@@ -11,4 +11,6 @@ to require the features specified in the interface of ``foo``.
 
 Contents of ``INTERFACE_COMPILE_FEATURES`` may use "generator expressions"
 with the syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)`
-manual for available expressions.
+manual for available expressions.  See the
+:manual:`cmake-compile-features(7)` manual for information on compile
+features.