mirror of
https://github.com/reactos/CMake.git
synced 2024-11-28 05:50:42 +00:00
Help: Move Modules/readme.txt content into cmake-developer.7 manual
Move all content from Modules/readme.txt except for the link to the module maintainers wiki page into "Help/manual/cmake-developer.7.rst". This produces some invalid reStructuredText markup to be fixed in a future commit.
This commit is contained in:
Kitware Robot
Brad King
parent
80a311ed6a
commit
baaab068f2
@ -16,3 +16,191 @@ Help
|
||||
|
||||
Modules
|
||||
=======
|
||||
|
||||
Note to authors of FindXxx.cmake files
|
||||
|
||||
We would like all FindXxx.cmake files to produce consistent variable names.
|
||||
|
||||
Please use the following consistent variable names for general use.
|
||||
|
||||
Xxx_INCLUDE_DIRS The final set of include directories listed in one variable for use by client code.
|
||||
This should not be a cache entry.
|
||||
Xxx_LIBRARIES The libraries to link against to use Xxx. These should include full paths.
|
||||
This should not be a cache entry.
|
||||
Xxx_DEFINITIONS Definitions to use when compiling code that uses Xxx. This really shouldn't include options such
|
||||
as (-DHAS_JPEG)that a client source-code file uses to decide whether to #include <jpeg.h>
|
||||
Xxx_EXECUTABLE Where to find the Xxx tool.
|
||||
Xxx_Yyy_EXECUTABLE Where to find the Yyy tool that comes with Xxx.
|
||||
Xxx_LIBRARY_DIRS Optionally, the final set of library directories listed in one variable for use by client code.
|
||||
This should not be a cache entry.
|
||||
Xxx_ROOT_DIR Where to find the base directory of Xxx.
|
||||
Xxx_VERSION_Yy Expect Version Yy if true. Make sure at most one of these is ever true.
|
||||
Xxx_WRAP_Yy If False, do not try to use the relevant CMake wrapping command.
|
||||
Xxx_Yy_FOUND If False, optional Yy part of Xxx sytem is not available.
|
||||
Xxx_FOUND Set to false, or undefined, if we haven't found, or don't want to use Xxx.
|
||||
Xxx_NOT_FOUND_MESSAGE Should be set by config-files in the case that it has set Xxx_FOUND to FALSE.
|
||||
The contained message will be printed by the find_package() command and by
|
||||
find_package_handle_standard_args() to inform the user about the problem.
|
||||
Xxx_RUNTIME_LIBRARY_DIRS Optionally, the runtime library search path for use when running an executable linked to
|
||||
shared libraries.
|
||||
The list should be used by user code to create the PATH on windows or LD_LIBRARY_PATH on unix.
|
||||
This should not be a cache entry.
|
||||
Xxx_VERSION_STRING A human-readable string containing the version of the package found, if any.
|
||||
Xxx_VERSION_MAJOR The major version of the package found, if any.
|
||||
Xxx_VERSION_MINOR The minor version of the package found, if any.
|
||||
Xxx_VERSION_PATCH The patch version of the package found, if any.
|
||||
|
||||
You do not have to provide all of the above variables. You should provide Xxx_FOUND under most circumstances.
|
||||
If Xxx is a library, then Xxx_LIBRARIES, should also be defined, and Xxx_INCLUDE_DIRS should usually be
|
||||
defined (I guess libm.a might be an exception)
|
||||
|
||||
The following names should not usually be used in CMakeLists.txt files, but they may be usefully modified in
|
||||
users' CMake Caches to control stuff.
|
||||
|
||||
Xxx_LIBRARY Name of Xxx Library. A User may set this and Xxx_INCLUDE_DIR to ignore to force non-use of Xxx.
|
||||
Xxx_Yy_LIBRARY Name of Yy library that is part of the Xxx system. It may or may not be required to use Xxx.
|
||||
Xxx_INCLUDE_DIR Where to find xxx.h, etc. (Xxx_INCLUDE_PATH was considered bad because a path includes an
|
||||
actual filename.)
|
||||
Xxx_Yy_INCLUDE_DIR Where to find xxx_yy.h, etc.
|
||||
|
||||
For tidiness's sake, try to keep as many options as possible out of the cache, leaving at least one option which can be
|
||||
used to disable use of the module, or locate a not-found library (e.g. Xxx_ROOT_DIR).
|
||||
For the same reason, mark most cache options as advanced.
|
||||
|
||||
If you need other commands to do special things then it should still begin with Xxx_. This gives a sort of namespace
|
||||
effect and keeps things tidy for the user. You should put comments describing all the exported settings, plus
|
||||
descriptions of any the users can use to control stuff.
|
||||
|
||||
You really should also provide backwards compatibility any old settings that were actually in use.
|
||||
Make sure you comment them as deprecated, so that no-one starts using them.
|
||||
|
||||
To add a module to the CMake documentation, follow these steps:
|
||||
|
||||
1. Add file ``Help/module/FindXxx.rst`` containing just the line::
|
||||
|
||||
.. cmake-module:: ../../Modules/FindXxx.cmake
|
||||
|
||||
2. Modify ``Help/manual/cmake-modules.7.rst`` to reference the module in the
|
||||
toctree directive as::
|
||||
|
||||
/module/FindXxx
|
||||
|
||||
Keep the toctree in sorted order!
|
||||
|
||||
3. Add to the top of ``Modules/FindXxx.cmake`` a #-comment of the form::
|
||||
|
||||
#.rst:
|
||||
# FindXxx
|
||||
# -------
|
||||
#
|
||||
# ...reStructuredText documentation of module...
|
||||
|
||||
Comment blocks starting with the line ``#.rst:`` may appear anywhere
|
||||
in the file.
|
||||
|
||||
For example::
|
||||
|
||||
#.rst
|
||||
# FindXxx
|
||||
# -------
|
||||
#
|
||||
# This is a cool module.
|
||||
# This module does really cool stuff.
|
||||
# It can do even more than you think.
|
||||
#
|
||||
# It even needs two paragraphs to tell you about it.
|
||||
# And it defines the following variables:
|
||||
#
|
||||
# * VAR_COOL: this is great isn't it?
|
||||
# * VAR_REALLY_COOL: cool right?
|
||||
|
||||
Test the documentation formatting by running "cmake --help-module FindXxx",
|
||||
and ideally by enabling the SPHINX_HTML and SPHINX_MAN options to build the
|
||||
documentation. Edit the comments until generated documentation looks
|
||||
satisfactory.
|
||||
|
||||
To have a .cmake file in this directory NOT show up in the modules
|
||||
documentation, simply leave out the ``Help/module/<module>.rst`` file and the
|
||||
``Help/manual/cmake-modules.7.rst`` toctree entry.
|
||||
|
||||
After the documentation, leave a *BLANK* line, and then add a
|
||||
copyright and licence notice block like this one:
|
||||
|
||||
#=============================================================================
|
||||
# Copyright 2009-2011 Your Name
|
||||
#
|
||||
# Distributed under the OSI-approved BSD License (the "License");
|
||||
# see accompanying file Copyright.txt for details.
|
||||
#
|
||||
# This software is distributed WITHOUT ANY WARRANTY; without even the
|
||||
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
# See the License for more information.
|
||||
#=============================================================================
|
||||
# (To distribute this file outside of CMake, substitute the full
|
||||
# License text for the above reference.)
|
||||
|
||||
The layout of the notice block is strictly enforced by the ModuleNotices test.
|
||||
Only the year range and name may be changed freely.
|
||||
|
||||
A FindXxx.cmake module will typically be loaded by the command
|
||||
|
||||
FIND_PACKAGE(Xxx [major[.minor[.patch[.tweak]]]] [EXACT]
|
||||
[QUIET] [[REQUIRED|COMPONENTS] [components...]])
|
||||
|
||||
If any version numbers are given to the command it will set the
|
||||
following variables before loading the module:
|
||||
|
||||
Xxx_FIND_VERSION = full requested version string
|
||||
Xxx_FIND_VERSION_MAJOR = major version if requested, else 0
|
||||
Xxx_FIND_VERSION_MINOR = minor version if requested, else 0
|
||||
Xxx_FIND_VERSION_PATCH = patch version if requested, else 0
|
||||
Xxx_FIND_VERSION_TWEAK = tweak version if requested, else 0
|
||||
Xxx_FIND_VERSION_COUNT = number of version components, 0 to 4
|
||||
Xxx_FIND_VERSION_EXACT = true if EXACT option was given
|
||||
|
||||
If the find module supports versioning it should locate a version of
|
||||
the package that is compatible with the version requested. If a
|
||||
compatible version of the package cannot be found the module should
|
||||
not report success. The version of the package found should be stored
|
||||
in "Xxx_VERSION..." version variables documented by the module.
|
||||
|
||||
If the QUIET option is given to the command it will set the variable
|
||||
Xxx_FIND_QUIETLY to true before loading the FindXxx.cmake module. If
|
||||
this variable is set the module should not complain about not being
|
||||
able to find the package. If the
|
||||
REQUIRED option is given to the command it will set the variable
|
||||
Xxx_FIND_REQUIRED to true before loading the FindXxx.cmake module. If
|
||||
this variable is set the module should issue a FATAL_ERROR if the
|
||||
package cannot be found.
|
||||
If neither the QUIET nor REQUIRED options are given then the
|
||||
FindXxx.cmake module should look for the package and complain without
|
||||
error if the module is not found.
|
||||
|
||||
FIND_PACKAGE() will set the variable CMAKE_FIND_PACKAGE_NAME to
|
||||
contain the actual name of the package.
|
||||
|
||||
A package can provide sub-components.
|
||||
Those components can be listed after the COMPONENTS (or REQUIRED)
|
||||
or OPTIONAL_COMPONENTS keywords. The set of all listed components will be
|
||||
specified in a Xxx_FIND_COMPONENTS variable.
|
||||
For each package-specific component, say Yyy, a variable Xxx_FIND_REQUIRED_Yyy
|
||||
will be set to true if it listed after COMPONENTS and it will be set to false
|
||||
if it was listed after OPTIONAL_COMPONENTS.
|
||||
Using those variables a FindXxx.cmake module and also a XxxConfig.cmake package
|
||||
configuration file can determine whether and which components have been requested,
|
||||
and whether they were requested as required or as optional.
|
||||
For each of the requested components a Xxx_Yyy_FOUND variable should be set
|
||||
accordingly.
|
||||
The per-package Xxx_FOUND variable should be only set to true if all requested
|
||||
required components have been found. A missing optional component should not
|
||||
keep the Xxx_FOUND variable from being set to true.
|
||||
If the package provides Xxx_INCLUDE_DIRS and Xxx_LIBRARIES variables, the include
|
||||
dirs and libraries for all components which were requested and which have been
|
||||
found should be added to those two variables.
|
||||
|
||||
To get this behaviour you can use the FIND_PACKAGE_HANDLE_STANDARD_ARGS()
|
||||
macro, as an example see FindJPEG.cmake.
|
||||
|
||||
For internal implementation, it's a generally accepted convention that variables starting with
|
||||
underscore are for temporary use only. (variable starting with an underscore
|
||||
are not intended as a reserved prefix).
|
||||
|
||||
@ -1,190 +1,2 @@
|
||||
For more information about how to contribute modules to CMake, see this page:
|
||||
http://www.itk.org/Wiki/CMake:Module_Maintainers
|
||||
|
||||
Note to authors of FindXxx.cmake files
|
||||
|
||||
We would like all FindXxx.cmake files to produce consistent variable names.
|
||||
|
||||
Please use the following consistent variable names for general use.
|
||||
|
||||
Xxx_INCLUDE_DIRS The final set of include directories listed in one variable for use by client code.
|
||||
This should not be a cache entry.
|
||||
Xxx_LIBRARIES The libraries to link against to use Xxx. These should include full paths.
|
||||
This should not be a cache entry.
|
||||
Xxx_DEFINITIONS Definitions to use when compiling code that uses Xxx. This really shouldn't include options such
|
||||
as (-DHAS_JPEG)that a client source-code file uses to decide whether to #include <jpeg.h>
|
||||
Xxx_EXECUTABLE Where to find the Xxx tool.
|
||||
Xxx_Yyy_EXECUTABLE Where to find the Yyy tool that comes with Xxx.
|
||||
Xxx_LIBRARY_DIRS Optionally, the final set of library directories listed in one variable for use by client code.
|
||||
This should not be a cache entry.
|
||||
Xxx_ROOT_DIR Where to find the base directory of Xxx.
|
||||
Xxx_VERSION_Yy Expect Version Yy if true. Make sure at most one of these is ever true.
|
||||
Xxx_WRAP_Yy If False, do not try to use the relevant CMake wrapping command.
|
||||
Xxx_Yy_FOUND If False, optional Yy part of Xxx sytem is not available.
|
||||
Xxx_FOUND Set to false, or undefined, if we haven't found, or don't want to use Xxx.
|
||||
Xxx_NOT_FOUND_MESSAGE Should be set by config-files in the case that it has set Xxx_FOUND to FALSE.
|
||||
The contained message will be printed by the find_package() command and by
|
||||
find_package_handle_standard_args() to inform the user about the problem.
|
||||
Xxx_RUNTIME_LIBRARY_DIRS Optionally, the runtime library search path for use when running an executable linked to
|
||||
shared libraries.
|
||||
The list should be used by user code to create the PATH on windows or LD_LIBRARY_PATH on unix.
|
||||
This should not be a cache entry.
|
||||
Xxx_VERSION_STRING A human-readable string containing the version of the package found, if any.
|
||||
Xxx_VERSION_MAJOR The major version of the package found, if any.
|
||||
Xxx_VERSION_MINOR The minor version of the package found, if any.
|
||||
Xxx_VERSION_PATCH The patch version of the package found, if any.
|
||||
|
||||
You do not have to provide all of the above variables. You should provide Xxx_FOUND under most circumstances.
|
||||
If Xxx is a library, then Xxx_LIBRARIES, should also be defined, and Xxx_INCLUDE_DIRS should usually be
|
||||
defined (I guess libm.a might be an exception)
|
||||
|
||||
The following names should not usually be used in CMakeLists.txt files, but they may be usefully modified in
|
||||
users' CMake Caches to control stuff.
|
||||
|
||||
Xxx_LIBRARY Name of Xxx Library. A User may set this and Xxx_INCLUDE_DIR to ignore to force non-use of Xxx.
|
||||
Xxx_Yy_LIBRARY Name of Yy library that is part of the Xxx system. It may or may not be required to use Xxx.
|
||||
Xxx_INCLUDE_DIR Where to find xxx.h, etc. (Xxx_INCLUDE_PATH was considered bad because a path includes an
|
||||
actual filename.)
|
||||
Xxx_Yy_INCLUDE_DIR Where to find xxx_yy.h, etc.
|
||||
|
||||
For tidiness's sake, try to keep as many options as possible out of the cache, leaving at least one option which can be
|
||||
used to disable use of the module, or locate a not-found library (e.g. Xxx_ROOT_DIR).
|
||||
For the same reason, mark most cache options as advanced.
|
||||
|
||||
If you need other commands to do special things then it should still begin with Xxx_. This gives a sort of namespace
|
||||
effect and keeps things tidy for the user. You should put comments describing all the exported settings, plus
|
||||
descriptions of any the users can use to control stuff.
|
||||
|
||||
You really should also provide backwards compatibility any old settings that were actually in use.
|
||||
Make sure you comment them as deprecated, so that no-one starts using them.
|
||||
|
||||
To add a module to the CMake documentation, follow these steps:
|
||||
|
||||
1. Add file ``Help/module/FindXxx.rst`` containing just the line::
|
||||
|
||||
.. cmake-module:: ../../Modules/FindXxx.cmake
|
||||
|
||||
2. Modify ``Help/manual/cmake-modules.7.rst`` to reference the module in the
|
||||
toctree directive as::
|
||||
|
||||
/module/FindXxx
|
||||
|
||||
Keep the toctree in sorted order!
|
||||
|
||||
3. Add to the top of ``Modules/FindXxx.cmake`` a #-comment of the form::
|
||||
|
||||
#.rst:
|
||||
# FindXxx
|
||||
# -------
|
||||
#
|
||||
# ...reStructuredText documentation of module...
|
||||
|
||||
Comment blocks starting with the line ``#.rst:`` may appear anywhere
|
||||
in the file.
|
||||
|
||||
For example::
|
||||
|
||||
#.rst
|
||||
# FindXxx
|
||||
# -------
|
||||
#
|
||||
# This is a cool module.
|
||||
# This module does really cool stuff.
|
||||
# It can do even more than you think.
|
||||
#
|
||||
# It even needs two paragraphs to tell you about it.
|
||||
# And it defines the following variables:
|
||||
#
|
||||
# * VAR_COOL: this is great isn't it?
|
||||
# * VAR_REALLY_COOL: cool right?
|
||||
|
||||
Test the documentation formatting by running "cmake --help-module FindXxx",
|
||||
and ideally by enabling the SPHINX_HTML and SPHINX_MAN options to build the
|
||||
documentation. Edit the comments until generated documentation looks
|
||||
satisfactory.
|
||||
|
||||
To have a .cmake file in this directory NOT show up in the modules
|
||||
documentation, simply leave out the ``Help/module/<module>.rst`` file and the
|
||||
``Help/manual/cmake-modules.7.rst`` toctree entry.
|
||||
|
||||
After the documentation, leave a *BLANK* line, and then add a
|
||||
copyright and licence notice block like this one:
|
||||
|
||||
#=============================================================================
|
||||
# Copyright 2009-2011 Your Name
|
||||
#
|
||||
# Distributed under the OSI-approved BSD License (the "License");
|
||||
# see accompanying file Copyright.txt for details.
|
||||
#
|
||||
# This software is distributed WITHOUT ANY WARRANTY; without even the
|
||||
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
# See the License for more information.
|
||||
#=============================================================================
|
||||
# (To distribute this file outside of CMake, substitute the full
|
||||
# License text for the above reference.)
|
||||
|
||||
The layout of the notice block is strictly enforced by the ModuleNotices test.
|
||||
Only the year range and name may be changed freely.
|
||||
|
||||
A FindXxx.cmake module will typically be loaded by the command
|
||||
|
||||
FIND_PACKAGE(Xxx [major[.minor[.patch[.tweak]]]] [EXACT]
|
||||
[QUIET] [[REQUIRED|COMPONENTS] [components...]])
|
||||
|
||||
If any version numbers are given to the command it will set the
|
||||
following variables before loading the module:
|
||||
|
||||
Xxx_FIND_VERSION = full requested version string
|
||||
Xxx_FIND_VERSION_MAJOR = major version if requested, else 0
|
||||
Xxx_FIND_VERSION_MINOR = minor version if requested, else 0
|
||||
Xxx_FIND_VERSION_PATCH = patch version if requested, else 0
|
||||
Xxx_FIND_VERSION_TWEAK = tweak version if requested, else 0
|
||||
Xxx_FIND_VERSION_COUNT = number of version components, 0 to 4
|
||||
Xxx_FIND_VERSION_EXACT = true if EXACT option was given
|
||||
|
||||
If the find module supports versioning it should locate a version of
|
||||
the package that is compatible with the version requested. If a
|
||||
compatible version of the package cannot be found the module should
|
||||
not report success. The version of the package found should be stored
|
||||
in "Xxx_VERSION..." version variables documented by the module.
|
||||
|
||||
If the QUIET option is given to the command it will set the variable
|
||||
Xxx_FIND_QUIETLY to true before loading the FindXxx.cmake module. If
|
||||
this variable is set the module should not complain about not being
|
||||
able to find the package. If the
|
||||
REQUIRED option is given to the command it will set the variable
|
||||
Xxx_FIND_REQUIRED to true before loading the FindXxx.cmake module. If
|
||||
this variable is set the module should issue a FATAL_ERROR if the
|
||||
package cannot be found.
|
||||
If neither the QUIET nor REQUIRED options are given then the
|
||||
FindXxx.cmake module should look for the package and complain without
|
||||
error if the module is not found.
|
||||
|
||||
FIND_PACKAGE() will set the variable CMAKE_FIND_PACKAGE_NAME to
|
||||
contain the actual name of the package.
|
||||
|
||||
A package can provide sub-components.
|
||||
Those components can be listed after the COMPONENTS (or REQUIRED)
|
||||
or OPTIONAL_COMPONENTS keywords. The set of all listed components will be
|
||||
specified in a Xxx_FIND_COMPONENTS variable.
|
||||
For each package-specific component, say Yyy, a variable Xxx_FIND_REQUIRED_Yyy
|
||||
will be set to true if it listed after COMPONENTS and it will be set to false
|
||||
if it was listed after OPTIONAL_COMPONENTS.
|
||||
Using those variables a FindXxx.cmake module and also a XxxConfig.cmake package
|
||||
configuration file can determine whether and which components have been requested,
|
||||
and whether they were requested as required or as optional.
|
||||
For each of the requested components a Xxx_Yyy_FOUND variable should be set
|
||||
accordingly.
|
||||
The per-package Xxx_FOUND variable should be only set to true if all requested
|
||||
required components have been found. A missing optional component should not
|
||||
keep the Xxx_FOUND variable from being set to true.
|
||||
If the package provides Xxx_INCLUDE_DIRS and Xxx_LIBRARIES variables, the include
|
||||
dirs and libraries for all components which were requested and which have been
|
||||
found should be added to those two variables.
|
||||
|
||||
To get this behaviour you can use the FIND_PACKAGE_HANDLE_STANDARD_ARGS()
|
||||
macro, as an example see FindJPEG.cmake.
|
||||
|
||||
For internal implementation, it's a generally accepted convention that variables starting with
|
||||
underscore are for temporary use only. (variable starting with an underscore
|
||||
are not intended as a reserved prefix).
|
||||
|
||||
Loading…
Reference in New Issue
Block a user