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cmake: fix gif lib detection when cross compiling

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GIF find_package only locates the header and library, it doesn't fail
compile tests when detecting the version, but falls back to 3 (as of at
least cmake 3.7.2). Make sure the library links to avoid incorrect
detection when cross compiling.

Change-Id: I0224180bbdf800ab261a9333236730b23c006e69
This commit is contained in:
James Zern 2017-07-05 23:52:04 -07:00
parent c793417a3c
commit 471c5755fc
1 changed files with 23 additions and 2 deletions
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25
cmake/config.h.cmake
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@ -75,13 +75,34 @@ foreach(I_LIB PNG JPEG TIFF)
endforeach()
# GIF detection, gifdec isn't part of the imageio lib.
include(CMakePushCheckState)
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})
# GIF find_package only locates the header and library, it doesn't fail
# compile tests when detecting the version, but falls back to 3 (as of at
# least cmake 3.7.2). Make sure the library links to avoid incorrect
# detection when cross compiling.
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES ${GIF_LIBRARIES})
set(CMAKE_REQUIRED_INCLUDES ${GIF_INCLUDE_DIR})
check_c_source_compiles("
#include <gif_lib.h>
int main(void) {
(void)DGifOpenFileHandle;
return 0;
}
" GIF_COMPILES
)
cmake_pop_check_state()
if(GIF_COMPILES)
list(APPEND WEBP_DEP_GIF_LIBRARIES ${GIF_LIBRARIES})
list(APPEND WEBP_DEP_GIF_INCLUDE_DIRS ${GIF_INCLUDE_DIR})
else()
unset(GIF_FOUND)
endif()
endif()
## Check for specific headers.