From ec666c7526f0236f783805b0ae622ca6e58d9dac Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Thu, 6 Jul 2017 11:45:47 -0700
Subject: [PATCH] cmake: split gif detection from IMG deps

gifdec isn't part of imageio lib, it's only used by gif2webp.

Change-Id: I70bff378a32f8fb2ebb8a5a7701049ffff7f7992
(cherry picked from commit dcbc1c881a001f45081834a47391d673c1b96907)
---
 CMakeLists.txt       |  4 ++--
 cmake/config.h.cmake | 12 +++++++++++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cef31733..07ccb0dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -234,12 +234,12 @@ endif()
 
 if(WEBP_BUILD_GIF2WEBP)
   # gif2webp
-  include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
+  include_directories(${WEBP_DEP_GIF_INCLUDE_DIRS})
   parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "GIF2WEBP_SRCS"
     "gif2webp")
   add_executable(gif2webp ${GIF2WEBP_SRCS})
   target_link_libraries(gif2webp exampleutil imageioutil webp webpmux
-    ${WEBP_DEP_IMG_LIBRARIES})
+    ${WEBP_DEP_GIF_LIBRARIES})
   install(TARGETS gif2webp RUNTIME DESTINATION bin)
 endif()
 
diff --git a/cmake/config.h.cmake b/cmake/config.h.cmake
index 0aade0c0..20f62d06 100644
--- a/cmake/config.h.cmake
+++ b/cmake/config.h.cmake
@@ -65,7 +65,7 @@ endif()
 # Find the standard image libraries.
 set(WEBP_DEP_IMG_LIBRARIES)
 set(WEBP_DEP_IMG_INCLUDE_DIRS)
-foreach(I_LIB PNG JPEG TIFF GIF)
+foreach(I_LIB PNG JPEG TIFF)
   find_package(${I_LIB})
   set(WEBP_HAVE_${I_LIB} ${${I_LIB}_FOUND})
   if(${I_LIB}_FOUND)
@@ -74,6 +74,16 @@ foreach(I_LIB PNG JPEG TIFF GIF)
   endif()
 endforeach()
 
+# GIF detection, gifdec isn't part of the imageio lib.
+set(WEBP_DEP_GIF_LIBRARIES)
+set(WEBP_DEP_GIF_INCLUDE_DIRS)
+find_package(GIF)
+set(WEBP_HAVE_GIF ${GIF_FOUND})
+if(GIF_FOUND)
+  list(APPEND WEBP_DEP_GIF_LIBRARIES ${GIF_LIBRARIES})
+  list(APPEND WEBP_DEP_GIF_INCLUDE_DIRS ${GIF_INCLUDE_DIR})
+endif()
+
 ## Check for specific headers.
 include(CheckIncludeFiles)
 check_include_files("stdlib.h;stdarg.h;string.h;float.h" STDC_HEADERS)