Extend blt_check_code_compiles macro to handle dependencies

[mcfadden8]

While developing LLNL/Umpire#807, we needed to be able to detemine whether there was HIP suppport for course grained memory coherence. We wanted to attempt to compile segments of code that used this functionality to determine compile-time support.

[kennyweiss]

Thanks @mcfadden8

Is there a simple test that could exercise this new option?
We have one for blt_check_code_compiles (without this option), here:

blt/tests/internal/unit/CMakeLists.txt

Lines 154 to 175 in 6a73c2c

	message(STATUS "Checking for blt_check_code_compiles")
	blt_check_code_compiles(CODE_COMPILES _hello_world_compiled
	VERBOSE_OUTPUT ON
	SOURCE_STRING
	[=[
	#include <iostream>
	int main(int, char**)
	{
	std::cout << "Hello World!" << std::endl;
	return 0;
	}
	]=])
	if(_hello_world_compiled)
	message(STATUS "... passed")
	else()
	message(FATAL_ERROR "... failed to compile.")
	endif()

[mcfadden8]

@kennyweiss and @white238, I was thinking that a good way to test this would be to find a library that we would need to FIND_PACKAGE on and then pass that library in to blt_check_code_compiles. Besides major things like cuda and hip, I have not yet found a package that fits the bill. I tried zlib and sqlite3, but both of those packages seem to have been installed on the system already.

I was thinking I could try a test like:

Test 1. if (FIND_PACKATE(x)) - Expect blt_check_code_compiles(src, x) to succeed
Test 2. else - Expect blt_check_code_compiles(src) to fail

Can anyone think of good library candidates to use or perhaps a different way of testing it?

One option is that I could just use FIND_PACKAGE(sqlite3) and use it. It would exercise test 1 of the code, but not necessarily test 2 until the test was in an evironment that did not have sqlite3 available.

Am I overthinking this? Should I be satisfied that test 1 is sufficient?

[white238]

I think that adding a guarded test for MPI then just running a duplicate of the MPI smoke test should be sufficient.

But you could also add a hip/cuda one.

[rhornung67]

@mcfadden8 what about camp?

[mcfadden8]

Tests added. Please let me know if you have any additional adjustments I should make. Thanks