Fix: Mesa and OSL dependency build error due to missing xml2 from llvm-config

build_files/build_environment/cmake/mesa.cmake

@@ -12,6 +12,10 @@ file(WRITE ${BUILD_DIR}/mesa/tmp/native-file.ini "\
 llvm-config = '${LIBDIR}/llvm/bin/llvm-config'"
 )
 
+# llvm-config will add -lmxl2. Make sure it can be found and that no system
+# library is used instead.
+set(MESA_LDFLAGS "-L${LIBDIR}/xml2/lib")
+
 set(MESA_EXTRA_FLAGS
   ${MESON_BUILD_TYPE}
   -Dc_args=${MESA_CFLAGS}

build_files/build_environment/cmake/osl.cmake

@@ -4,10 +4,14 @@
 
 if(WIN32)
   set(OSL_CMAKE_CXX_STANDARD_LIBRARIES "kernel32${LIBEXT} user32${LIBEXT} gdi32${LIBEXT} winspool${LIBEXT} shell32${LIBEXT} ole32${LIBEXT} oleaut32${LIBEXT} uuid${LIBEXT} comdlg32${LIBEXT} advapi32${LIBEXT} psapi${LIBEXT}")
+  set(OSL_CMAKE_LINKER_FLAGS)
   set(OSL_FLEX_BISON -DFLEX_EXECUTABLE=${LIBDIR}/flexbison/win_flex.exe -DBISON_EXECUTABLE=${LIBDIR}/flexbison/win_bison.exe)
 else()
   set(OSL_CMAKE_CXX_STANDARD_LIBRARIES)
-  set(OSL_OPENIMAGEIO_LIBRARY "${LIBDIR}/openimageio/lib/OpenImageIO${SHAREDLIBEXT};${LIBDIR}/png/lib/${LIBPREFIX}png16${LIBEXT};${LIBDIR}/jpeg/lib/${LIBPREFIX}jpeg${LIBEXT};${LIBDIR}/tiff/lib/${LIBPREFIX}tiff${LIBEXT};${LIBDIR}/openexr/lib/IlmImf${OPENEXR_VERSION_POSTFIX}${SHAREDLIBEXT}")
+  # llvm-config will add -lmxl2. Make sure it can be found and that no system
+  # library is used instead.
+  set(OSL_CMAKE_LINKER_FLAGS "-L${LIBDIR}/xml2/lib")
+  set(OSL_OPENIMAGEIO_LIBRARY "${LIBDIR}/openimageio/lib/OpenImageIO${SHAREDLIBEXT};${LIBDIR}/openexr/lib/IlmImf${OPENEXR_VERSION_POSTFIX}${SHAREDLIBEXT}")
 
   if(APPLE)
     # Explicitly specify Homebrew path, so we don't use the old system one.
@@ -30,6 +34,8 @@ set(OSL_EXTRA_ARGS
   -DZLIB_INCLUDE_DIR=${LIBDIR}/zlib/include/
   ${OSL_FLEX_BISON}
   -DCMAKE_CXX_STANDARD_LIBRARIES=${OSL_CMAKE_CXX_STANDARD_LIBRARIES}
+  -DCMAKE_EXE_LINKER_FLAGS=${OSL_CMAKE_LINKER_FLAGS}
+  -DCMAKE_SHARED_LINKER_FLAGS=${OSL_CMAKE_LINKER_FLAGS}
   -DBUILD_SHARED_LIBS=ON
   -DLINKSTATIC=OFF
   -DOSL_BUILD_PLUGINS=OFF