[Webkit-unassigned] [Bug 130195] New: [CMake] Failure to link with older installations of WebP

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=130195

           Summary: [CMake] Failure to link with older installations of
                    WebP
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mario at webkit.org
                CC: gns at gnome.org


I hit the following problem today while trying to build WebKitGTK+ in my Ubuntu 12.10 box, which comes with libwebp 0.1.3-3 installed:

[4676/5658] Linking CXX shared library lib/libwebkitgtk-3.0.so.0.22.0
FAILED: : && /usr/lib/ccache/c++  -fPIC  -std=gnu++0x -fno-omit-frame-pointer -fno-tree-dce -O3 -DNDEBUG  -Wl,--no-undefined  -L/home/SERILOCAL/mario.prada/work/WebKit/WebKitBuild/Dependencies/Root/lib64 -shared -Wl,-soname,libwebkitgtk-3.0.so.0 -o lib/libwebkitgtk-3.0.so.0.22.0 @CMakeFiles/WebKit.rsp  && :
lib/libWebCoreGTK.a(lib/../Source/WebCore/CMakeFiles/WebCore.dir/platform/image-decoders/webp/WEBPImageDecoder.cpp.o):WEBPImageDecoder.cpp:function WebCore::WEBPImageDecoder::clear(): error: undefined reference to 'WebPIDelete'
lib/libWebCoreGTK.a(lib/../Source/WebCore/CMakeFiles/WebCore.dir/platform/image-decoders/webp/WEBPImageDecoder.cpp.o):WEBPImageDecoder.cpp:function WebCore::WEBPImageDecoder::decode(bool): error: undefined reference to 'WebPIUpdate'
lib/libWebCoreGTK.a(lib/../Source/WebCore/CMakeFiles/WebCore.dir/platform/image-decoders/webp/WEBPImageDecoder.cpp.o):WEBPImageDecoder.cpp:function WebCore::WEBPImageDecoder::decode(bool): error: undefined reference to 'WebPGetInfo'
lib/libWebCoreGTK.a(lib/../Source/WebCore/CMakeFiles/WebCore.dir/platform/image-decoders/webp/WEBPImageDecoder.cpp.o):WEBPImageDecoder.cpp:function WebCore::WEBPImageDecoder::decode(bool): error: undefined reference to 'WebPINewRGB'
collect2: error: ld returned 1 exit status


Apparently, the check_include_files() in FindWebP.cmake file is not working as expected, since WEBP_FOUND is always defined to FALSE after calling it, no matter what you put as the header file to check (it even fails when searching for "stdio.h"). This is causing that the -lwebp flag is not being added, thus causing the trouble

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