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Subject: Failure to link with libjpeg.a using cmake configuration 
Message-Id: <AAE47C2C-22AE-4EB9-B5DB-209C99B4D239@codelibre.net>
Date: Mon, 29 Dec 2025 16:42:22 +0000
To: cygwin AT cygwin DOT com
From: Roger Leigh via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Roger Leigh <rleigh AT codelibre DOT net>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
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Hi,

I’m trying to test libtiff on Cygwin, and I’m running into a failure.  It’s finding and linking on all platforms with the exception of Cygwin (including MinGW64 and MSVC).  For example:

https://gitlab.com/libtiff/libtiff/-/pipelines/2236584193

-- Found ZLIB: /usr/lib/libz.dll.a (found version "1.3.1")
-- Found Deflate: /usr/lib/libdeflate.dll.a (found version "1.25")
CMake Error at /usr/lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake:99 (message):
The imported target "libjpeg-turbo::jpeg" references the file
"/usr/lib/libjpeg.dll.a"
but this file does not exist. Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and contained
"/usr/lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake"
but not all the files it references.
Call Stack (most recent call first):
/usr/lib/cmake/libjpeg-turbo/libjpeg-turboConfig.cmake:37 (include)
cmake/JPEGCodec.cmake:36 (find_package)

It is entirely correct.  The file that’s mentioned in the installed CMake config file does not exist.

$ find lib -name '*jpeg*'
lib/cmake/libjpeg-turbo
lib/cmake/libjpeg-turbo/libjpeg-turboConfig.cmake
lib/cmake/libjpeg-turbo/libjpeg-turboConfigVersion.cmake
lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake
lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake
lib/gdk-pixbuf-2.0/2.10.0/loaders/cygpixbufloader-jpeg.dll
lib/libopenjpeg.dll.a
lib/libturbojpeg.dll.a
lib/openjpeg-1.5
lib/pkgconfig/libopenjpeg.pc
lib/pkgconfig/libopenjpeg1.pc
lib/pkgconfig/libturbojpeg.pc

$ find bin -name '*jpeg*'
bin/cygjpeg-8.dll
bin/cygopenjpeg-1.dll
bin/cygturbojpeg-0.dll

So the DLL exists, but the import library does not.  Everything else is present and correct as far as I can tell, but something is not right here.  The import library is missing.

$ grep '\.a' lib/cmake/libjpeg-turbo/*
lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:  IMPORTED_IMPLIB_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib/libjpeg.dll.a"
lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:list(APPEND _cmake_import_check_files_for_libjpeg-turbo::jpeg "${_IMPORT_PREFIX}/lib/libjpeg.dll.a" "${_IMPORT_PREFIX}/bin/cygjpeg-8.dll" )
lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:  IMPORTED_IMPLIB_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib/libturbojpeg.dll.a"
lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:list(APPEND _cmake_import_check_files_for_libjpeg-turbo::turbojpeg "${_IMPORT_PREFIX}/lib/libturbojpeg.dll.a" "${_IMPORT_PREFIX}/bin/cygturbojpeg-0.dll" )

Because it’s referenced in the configuration, and has the DLL, and everything but this file is installed, this looks like a packaging error hence reporting it here as a bug.


Kind regards,
Roger

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