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* Use aliased SPIRV-Headers::SPIRV-Headers to also work with an installed SPIRV-Headers
SPIRV-Headers standalone is only defined when using sources directly.
When consuming an installed SPIRV-Headers via find_package, the full SPIRV-Headers::SPIRV-Headers must be used.
The full syntax is supported by both source and installed builds.
* Fix SLANG_USE_SYSTEM_SPIRV_HEADERS
- Use find_package to bring in SPIRV-Headers cmake targets
- Set SPIRV-Headers_SOURCE_DIR as a workaround when including
spirv-tools
- Query cmake for SLANG_SPIRV_HEADERS_INCLUDE_DIR location, supporting
default, SLANG_OVERRIDE_SPIRV_HEADERS_PATH and find_package builds.
- Cleanup unnecessary SPIRV_HEADER_DIR (unconditionally overwritten in
spirv-tools)
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