diff options
Diffstat (limited to 'Modules/FindGIF.cmake')
| -rw-r--r-- | Modules/FindGIF.cmake | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/Modules/FindGIF.cmake b/Modules/FindGIF.cmake index 8e2e43e..41e9098 100644 --- a/Modules/FindGIF.cmake +++ b/Modules/FindGIF.cmake @@ -1,7 +1,11 @@ -# This module defines +# This module searches giflib and defines # GIF_LIBRARIES - libraries to link to in order to use GIF # GIF_FOUND, if false, do not try to link # GIF_INCLUDE_DIR, where to find the headers +# GIF_VERSION, reports either version 4 or 3 (for everything before version 4) +# +# The minimum required version of giflib can be specified using the +# standard syntax, e.g. FIND_PACKAGE(GIF 4) # # $GIF_DIR is an environment variable that would # correspond to the ./configure --prefix=$GIF_DIR @@ -47,9 +51,30 @@ FIND_LIBRARY(GIF_LIBRARY # see readme.txt SET(GIF_LIBRARIES ${GIF_LIBRARY}) +# Very basic version detection. +# The GIF_LIB_VERSION string in gif_lib.h seems to be unreliable, since it seems +# to be always " Version 2.0, " in versions 3.x of giflib. +# In version 4 the member UserData was added to GifFileType, so we check for this +# one. +# http://giflib.sourcearchive.com/documentation/4.1.4/files.html +IF(GIF_INCLUDE_DIR) + INCLUDE(CMakePushCheckState) + INCLUDE(CheckStructHasMember) + CMAKE_PUSH_CHECK_STATE() + SET(GIF_VERSION 3) + SET(CMAKE_REQUIRED_INCLUDES "${GIF_INCLUDE_DIR}") + CHECK_STRUCT_HAS_MEMBER(GifFileType UserData gif_lib.h GIF_GifFileType_UserData ) + IF(GIF_GifFileType_UserData) + SET(GIF_VERSION 4) + ENDIF() + CMAKE_POP_CHECK_STATE() +ENDIF() + + # handle the QUIETLY and REQUIRED arguments and set GIF_FOUND to TRUE if # all listed variables are TRUE INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) -FIND_PACKAGE_HANDLE_STANDARD_ARGS(GIF DEFAULT_MSG GIF_LIBRARY GIF_INCLUDE_DIR) +FIND_PACKAGE_HANDLE_STANDARD_ARGS(GIF REQUIRED_VARS GIF_LIBRARY GIF_INCLUDE_DIR + VERSION_VAR GIF_VERSION ) MARK_AS_ADVANCED(GIF_INCLUDE_DIR GIF_LIBRARY) |