MacOs linker problem

[Czaki]

During building the macOS extension I found that libtiff and libblosc are "linked" (not sure if proper name) system site libraries libzstd and liblz4, which are built earlier and properly find by cmake.

-- Found LZ4 library: /Users/runner/work/1/s/build_utils/libs_build/lib/liblz4.dylib
-- Found Zstd library: /Users/runner/work/1/s/build_utils/libs_build/lib/libzstd.dylib

Here log:
https://dev.azure.com/bokota/imagecodecs/_build/results?buildId=638&view=logs&j=567a25c9-267d-5ec8-0386-2960989da2e4&t=f2935ac5-f96c-5e27-6bc4-6f14b3e80853&l=3463

It could be fixed using

imagecodecs_build/build_utils/fix_macos_lib.sh

Lines 47 to 49 in fc23628

	install_name_tool -change /usr/local/lib/libzstd.1.dylib @rpath/libzstd.1.5.0.dylib "${lib_dir}/libtiff.5.7.0.dylib"
	install_name_tool -change /usr/local/lib/libzstd.1.dylib @rpath/libzstd.1.5.0.dylib "${lib_dir}/libblosc.1.21.0.dylib"
	install_name_tool -change /usr/local/lib/liblz4.1.dylib @rpath/liblz4.1.9.3.dylib "${lib_dir}/libblosc.1.21.0.dylib"

but I would like to understand why after compilation I got (oas part of otool -l build_utils/libs_build/lib/libtiff.5.7.0.dylib)

          cmd LC_LOAD_DYLIB
      cmdsize 40
         name liblerc.dylib (offset 24)
   time stamp 2 Thu Jan  1 00:00:02 1970
      current version 0.0.0
compatibility version 0.0.0
Load command 14
          cmd LC_LOAD_DYLIB
      cmdsize 56
         name /usr/local/lib/libzstd.1.dylib (offset 24)
   time stamp 2 Thu Jan  1 00:00:02 1970
      current version 1.5.0
compatibility version 1.0.0
Load command 15

even if build_utils/libs_build/lib/ contains both libzstd.1.dylib and liblerc.dylib

Environment variables are set inside azure-pipelines.yaml

imagecodecs_build/azure-pipelines.yaml

Line 9 in fc23628

LD_LIBRARY_PATH: $(Build.Repository.LocalPath)/build_utils/libs_build/lib

imagecodecs_build/azure-pipelines.yaml

Lines 144 to 148 in fc23628

	LIBRARY_PATH: $(LD_LIBRARY_PATH)
	DYLD_LIBRARY_PATH: $(LD_LIBRARY_PATH)
	LD_RUNPATH_SEARCH_PATH: $(LD_LIBRARY_PATH)
	DYLD_FALLBACK_LIBRARY_PATH: $(LD_LIBRARY_PATH)
	MACOSX_DEPLOYMENT_TARGET: "10.9"

Build command is here:

imagecodecs_build/build_utils/build_libraries.sh

Lines 311 to 317 in fc23628

	echo "Build libtiff"
	cd "${download_dir}/libtiff" || exit 1
	mkdir -p _build
	cd _build || exit 1
	CMAKE_PREFIX_PATH=${build_dir} cmake -DCMAKE_INSTALL_PREFIX="${build_dir}" ..
	make
	make install