libclc: Use temporary files rather than a pipe

This is required for using the Ninja backend on Windows, as it passes
commands directly to CreateProcess, and does not allow the shell to
interpret the

libclc: Use temporary files rather than a pipe

This is required for using the Ninja backend on Windows, as it passes
commands directly to CreateProcess, and does not allow the shell to
interpret them: https://ninja-build.org/manual.html#ref_rule_command

Using the Visual Studio backend is not possible as attempting to create
a static library target comprised entirely of novel languages not known
to the Visual Studio backend built in to CMake's C++ source will
generate nothing at all.

reviewer: jvesely
Differential Revision: https://reviews.llvm.org/D77165

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libclc: Don't pass linker flags to CLC/LLAsm

We don't want the regular linker flags for these invocations, since
we're not compiling to the target machine anyway. This fixes things like
'/machine:x6

libclc: Don't pass linker flags to CLC/LLAsm

We don't want the regular linker flags for these invocations, since
we're not compiling to the target machine anyway. This fixes things like
'/machine:x64' being unknown when invoked under Windows.

reviewer: jvesely
Differential Revision: https://reviews.llvm.org/D77164

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libclc: Use echo rather than true for try_compile

When providing a fake compiler, libclc currently uses 'true' which does
not exist on Windows. Use echo instead as the no-op.

reviewer: jvesely
Diff

libclc: Use echo rather than true for try_compile

When providing a fake compiler, libclc currently uses 'true' which does
not exist on Windows. Use echo instead as the no-op.

reviewer: jvesely
Differential Revision: https://reviews.llvm.org/D77163

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