Return the usage of -flto and use -lto-emit-asm instead

[omarahmed1111]

This reverts this PR and add another solution to that problem mentioned in this issue. This was the result of llvm upstream discussion here

[omarahmed1111]

@mdtoguchi @AlexeySachkov The PR is failing in some tests due to not finding clang-nvlink-wrapper tool. I saw locally that the tool should be built by default with other clang tools and it works normally. Do you have an idea where the PATH is initialized on CI or how to debug that?

[AlexeySachkov]

@mdtoguchi @AlexeySachkov The PR is failing in some tests due to not finding clang-nvlink-wrapper tool. I saw locally that the tool should be built by default with other clang tools and it works normally. Do you have an idea where the PATH is initialized on CI or how to debug that?

My guess is that dependency is missing here:

llvm/sycl/test-e2e/CMakeLists.txt

Lines 94 to 98 in c2dc01d

	list(APPEND SYCL_E2E_TEST_DEPS
	sycl-toolchain
	FileCheck
	not
	)

clang-nvlink-wrapper is not a part of our sycl-toolchain - if it should be (i.e. that is not a test-only dependency), then the following CMakeLists.txt should be updated:

llvm/sycl/CMakeLists.txt

Line 366 in c2dc01d

add_custom_target(sycl-compiler

Hope this helps