clc: force linking of spirvs with mismatching pointer types in signatures

With LLVM-17 and opaque pointers, sometimes the compiled spirvs lose all
their information in regards to what specific pointer type a function
parameter has.

To workaround this, we can tell the spirv linker to insert casts to handle
those cases.

See https://github.com/KhronosGroup/SPIRV-Tools/pull/5534

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30029>

src/compiler/clc/clc_helpers.cpp

@@ -1228,10 +1228,17 @@ clc_link_spirv_binaries(const struct clc_linker_args *args,
    context.SetMessageConsumer(msgconsumer);
    spvtools::LinkerOptions options;
    options.SetAllowPartialLinkage(args->create_library);
+   #if defined(HAS_SPIRV_LINK_LLVM_WORKAROUND) && LLVM_VERSION_MAJOR >= 17
+      options.SetAllowPtrTypeMismatch(true);
+   #endif
    options.SetCreateLibrary(args->create_library);
    std::vector<uint32_t> linkingResult;
    spv_result_t status = spvtools::Link(context, binaries, &linkingResult, options);
    if (status != SPV_SUCCESS) {
+      #if !defined(HAS_SPIRV_LINK_LLVM_WORKAROUND) && LLVM_VERSION_MAJOR >= 17
+        clc_warning(logger, "SPIRV-Tools doesn't contain https://github.com/KhronosGroup/SPIRV-Tools/pull/5534\n");
+        clc_warning(logger, "Please update in order to prevent spurious linking failures\n");
+      #endif
       return -1;
    }
 

src/compiler/clc/meson.build

@@ -82,6 +82,19 @@ else
   endif
 endif
 
+has_spirv_link_workaround = cpp.has_member(
+  'spvtools::LinkerOptions',
+  'SetAllowPtrTypeMismatch(true)',
+  prefix : [
+    '#include <spirv-tools/linker.hpp>',
+  ],
+  dependencies : dep_spirv_tools,
+)
+
+if has_spirv_link_workaround
+  _libmesaclc_c_args += ['-DHAS_SPIRV_LINK_LLVM_WORKAROUND=1']
+endif
+
 _libmesaclc = static_library(
   'libmesaclc',
   files_libmesaclc,