Salutations to all
Due to some recent changes in the WEBP source code, building the dynamic
libtiff library with WEBP support started giving the following error messages:
libwebp.lib(picture_csp_enc.obj) : error LNK2001: unresolved external symbol
SharpYuvConvert [C:\Build\bin\libtiff\libtiff\tiff.vcxproj]
libwebp.lib(picture_csp_enc.obj) : error LNK2001: unresolved external symbol
SharpYuvGetConversionMatrix [C:\Build\bin\libtiff\libtiff\tiff.vcxproj]
libwebp.lib(picture_csp_enc.obj) : error LNK2001: unresolved external symbol
SharpYuvInit [C:\Build\bin\libtiff\libtiff\tiff.vcxproj]
C:\Build\bin\libtiff\libtiff\Release\tiff.dll : fatal error LNK1120: 3
unresolved externals [C:\Build\bin\libtiff\libtiff\tiff.vcxproj]
This is related to the introduction of a new library in WEBP, libsharpyuv.lib.
I solved the problem by appending the following to the end of
libtiff/libtiff/CMakeLists.txt:
if(WEBP_SUPPORT)
target_link_libraries(${PROJECT_NAME} PRIVATE "C:/build/lib/libsharpyuv.lib")
endif()
or including the line in the relevant WEBP section (starting with line 148):
if(WEBP_SUPPORT)
target_link_libraries(tiff PRIVATE WebP::WebP)
string(APPEND tiff_requires_private " libwebp")
target_link_libraries(${PROJECT_NAME} PRIVATE "C:/build/lib/libsharpyuv.lib")
endif()
With this line, libtiff builds and works correctly.
But having to edit the file by hand each time is not very elegant and I would
like to find a definitive solution. I tried to pass the instruction on the
cmake command line, but I couldn’t find a working solution.
Better still would be someone with the necessary programming knowledge to come
up with a permanent solution on the original libtiff code. I am not a
developer, I am a libtiff user with just enough knowledge to compile it myself
and lightly modify code to solve basic issues.
I can also introduce the reference to libshrpyuv in Microsoft Visual Studio,
under Linker/Input/Additional Dependencies, but I mostly prefer to build from
the command line using cmake.
Any tips would be appreciated.
Thank you.
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