Merge branch 'doc-configure_file-output-location' into release
This commit is contained in:
Brad King
commit
481ec779ab
|
|
@ -9,38 +9,103 @@ Copy a file to another location and modify its contents.
|
|||
[COPYONLY] [ESCAPE_QUOTES] [@ONLY]
|
||||
[NEWLINE_STYLE [UNIX|DOS|WIN32|LF|CRLF] ])
|
||||
|
||||
Copies a file <input> to file <output> and substitutes variable values
|
||||
referenced in the file content. If <input> is a relative path it is
|
||||
evaluated with respect to the current source directory. The <input>
|
||||
must be a file, not a directory. If <output> is a relative path it is
|
||||
evaluated with respect to the current binary directory. If <output>
|
||||
names an existing directory the input file is placed in that directory
|
||||
with its original name.
|
||||
Copies an ``<input>`` file to an ``<output>`` file and substitutes
|
||||
variable values referenced as ``@VAR@`` or ``${VAR}`` in the input
|
||||
file content. Each variable reference will be replaced with the
|
||||
current value of the variable, or the empty string if the variable
|
||||
is not defined. Furthermore, input lines of the form::
|
||||
|
||||
If the <input> file is modified the build system will re-run CMake to
|
||||
#cmakedefine VAR ...
|
||||
|
||||
will be replaced with either::
|
||||
|
||||
#define VAR ...
|
||||
|
||||
or::
|
||||
|
||||
/* #undef VAR */
|
||||
|
||||
depending on whether ``VAR`` is set in CMake to any value not considered
|
||||
a false constant by the :command:`if` command. The "..." content on the
|
||||
line after the variable name, if any, is processed as above.
|
||||
Input file lines of the form ``#cmakedefine01 VAR`` will be replaced with
|
||||
either ``#define VAR 1`` or ``#define VAR 0`` similarly.
|
||||
|
||||
If the input file is modified the build system will re-run CMake to
|
||||
re-configure the file and generate the build system again.
|
||||
|
||||
This command replaces any variables in the input file referenced as
|
||||
${VAR} or @VAR@ with their values as determined by CMake. If a
|
||||
variable is not defined, it will be replaced with nothing. If
|
||||
COPYONLY is specified, then no variable expansion will take place. If
|
||||
ESCAPE_QUOTES is specified then any substituted quotes will be C-style
|
||||
escaped. The file will be configured with the current values of CMake
|
||||
variables. If @ONLY is specified, only variables of the form @VAR@
|
||||
will be replaced and ${VAR} will be ignored. This is useful for
|
||||
configuring scripts that use ${VAR}.
|
||||
The arguments are:
|
||||
|
||||
Input file lines of the form "#cmakedefine VAR ..." will be replaced
|
||||
with either "#define VAR ..." or ``/* #undef VAR */`` depending on
|
||||
whether VAR is set in CMake to any value not considered a false
|
||||
constant by the if() command. (Content of "...", if any, is processed
|
||||
as above.) Input file lines of the form "#cmakedefine01 VAR" will be
|
||||
replaced with either "#define VAR 1" or "#define VAR 0" similarly.
|
||||
``<input>``
|
||||
Path to the input file. A relative path is treated with respect to
|
||||
the value of :variable:`CMAKE_CURRENT_SOURCE_DIR`. The input path
|
||||
must be a file, not a directory.
|
||||
|
||||
With NEWLINE_STYLE the line ending could be adjusted:
|
||||
``<output>``
|
||||
Path to the output file or directory. A relative path is treated
|
||||
with respect to the value of :variable:`CMAKE_CURRENT_BINARY_DIR`.
|
||||
If the path names an existing directory the output file is placed
|
||||
in that directory with the same file name as the input file.
|
||||
|
||||
::
|
||||
``COPYONLY``
|
||||
Copy the file without replacing any variable references or other
|
||||
content. This option may not be used with ``NEWLINE_STYLE``.
|
||||
|
||||
'UNIX' or 'LF' for \n, 'DOS', 'WIN32' or 'CRLF' for \r\n.
|
||||
``ESCAPE_QUOTES``
|
||||
Escape any substituted quotes with backslashes (C-style).
|
||||
|
||||
COPYONLY must not be used with NEWLINE_STYLE.
|
||||
``@ONLY``
|
||||
Restrict variable replacement to references of the form ``@VAR@``.
|
||||
This is useful for configuring scripts that use ``${VAR}`` syntax.
|
||||
|
||||
``NEWLINE_STYLE <style>``
|
||||
Specify the newline style for the output file. Specify
|
||||
``UNIX`` or ``LF`` for ``\n`` newlines, or specify
|
||||
``DOS``, ``WIN32``, or ``CRLF`` for ``\r\n`` newlines.
|
||||
This option may not be used with ``COPYONLY``.
|
||||
|
||||
Example
|
||||
^^^^^^^
|
||||
|
||||
Consider a source tree containing a ``foo.h.in`` file:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
#cmakedefine FOO_ENABLE
|
||||
#cmakedefine FOO_STRING "@FOO_STRING@"
|
||||
|
||||
An adjacent ``CMakeLists.txt`` may use ``configure_file`` to
|
||||
configure the header:
|
||||
|
||||
.. code-block:: cmake
|
||||
|
||||
option(FOO_ENABLE "Enable Foo" ON)
|
||||
if(FOO_ENABLE)
|
||||
set(FOO_STRING "foo")
|
||||
endif()
|
||||
configure_file(foo.h.in foo.h @ONLY)
|
||||
|
||||
This creates a ``foo.h`` in the build directory corresponding to
|
||||
this source directory. If the ``FOO_ENABLE`` option is on, the
|
||||
configured file will contain:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
#define FOO_ENABLE
|
||||
#define FOO_STRING "foo"
|
||||
|
||||
Otherwise it will contain:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
/* #undef FOO_ENABLE */
|
||||
/* #undef FOO_STRING */
|
||||
|
||||
One may then use the :command:`include_directories` command to
|
||||
specify the output directory as an include directory:
|
||||
|
||||
.. code-block:: cmake
|
||||
|
||||
include_directories(${CMAKE_CURRENT_BINARY_DIR})
|
||||
|
||||
so that sources may include the header as ``#include <foo.h>``.
|
||||
|
|
|
|||
Loading…
Reference in New Issue