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FindGIF: Modernize

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This brings the module up to the current find module standards by adding
the GIF_INCLUDE_DIRS variable and the target GIF::GIF. It also updates
the documentation style to that of similar modules.
This commit is contained in:
Maximilian Heinzler
2018-11-18 16:59:50 +01:00
parent ea52ec9420
commit 5bc64fe6c2
1 changed files with 47 additions and 13 deletions
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60
Modules/FindGIF.cmake
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@@ -7,22 +7,43 @@ FindGIF
This finds the GIF library (giflib)
The module defines the following variables:
Imported targets
^^^^^^^^^^^^^^^^
This module defines the following :prop_tgt:`IMPORTED` target:
``GIF::GIF``
The giflib library, if found.
Result variables
^^^^^^^^^^^^^^^^
This module will set the following variables in your project:
``GIF_FOUND``
True if giflib was found
If false, do not try to use GIF.
``GIF_INCLUDE_DIRS``
where to find gif_lib.h, etc.
``GIF_LIBRARIES``
Libraries to link to in order to use giflib
``GIF_INCLUDE_DIR``
where to find the headers
the libraries needed to use GIF.
``GIF_VERSION``
3, 4 or a full version string (eg 5.1.4) for versions >= 4.1.6
3, 4 or a full version string (eg 5.1.4) for versions >= 4.1.6.
The minimum required version of giflib can be specified using the
standard syntax, e.g. find_package(GIF 4)
Cache variables
^^^^^^^^^^^^^^^
$GIF_DIR is an environment variable that would correspond to the
./configure --prefix=$GIF_DIR
The following cache variables may also be set:
``GIF_INCLUDE_DIR``
where to find the GIF headers.
``GIF_LIBRARY``
where to find the GIF library.
Hints
^^^^^
``GIF_DIR`` is an environment variable that would correspond to the
``./configure --prefix=$GIF_DIR``.
#]=======================================================================]
# Created by Eric Wing.
@@ -44,9 +65,6 @@ find_library(GIF_LIBRARY
PATH_SUFFIXES lib
)
# see readme.txt
set(GIF_LIBRARIES ${GIF_LIBRARY})
# Very basic version detection.
# The GIF_LIB_VERSION string in gif_lib.h seems to be unreliable, since it seems
# to be always " Version 2.0, " in versions 3.x of giflib.
@@ -90,4 +108,20 @@ include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(GIF REQUIRED_VARS GIF_LIBRARY GIF_INCLUDE_DIR
VERSION_VAR GIF_VERSION )
if(GIF_FOUND)
set(GIF_INCLUDE_DIRS "${GIF_INCLUDE_DIR}")
set(GIF_LIBRARIES ${GIF_LIBRARY})
if(NOT TARGET GIF::GIF)
add_library(GIF::GIF UNKNOWN IMPORTED)
set_target_properties(GIF::GIF PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${GIF_INCLUDE_DIRS}")
if(EXISTS "${GIF_LIBRARY}")
set_target_properties(GIF::GIF PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${GIF_LIBRARY}")
endif()
endif()
endif()
mark_as_advanced(GIF_INCLUDE_DIR GIF_LIBRARY)