Compiler-rt tests check compile and link

llvm-embedded · October 3, 2023, 3:50pm

llvm/llvm-project/blob/main/compiler-rt/cmake/config-ix.cmake#L241


      
          
          # Detect whether the current target platform is 32-bit or 64-bit, and setup
          # the correct commandline flags needed to attempt to target 32-bit and 64-bit.
          # AVR and MSP430 are omitted since they have 16-bit pointers.
          if (NOT CMAKE_SIZEOF_VOID_P EQUAL 4 AND
              NOT CMAKE_SIZEOF_VOID_P EQUAL 8 AND
              NOT ${arch} MATCHES "avr|msp430")
            message(FATAL_ERROR "Please use architecture with 4 or 8 byte pointers.")
          endif()
          
          test_targets()
          
          # Returns a list of architecture specific target cflags in @out_var list.
          function(get_target_flags_for_arch arch out_var)
            list(FIND COMPILER_RT_SUPPORTED_ARCH ${arch} ARCH_INDEX)
            if(ARCH_INDEX EQUAL -1)
              message(FATAL_ERROR "Unsupported architecture: ${arch}")
            else()
              if (NOT APPLE)
                set(${out_var} ${TARGET_${arch}_CFLAGS} PARENT_SCOPE)
              else()

when building compiler-rt the line above checks the host’s compiler compile and link.
my question is: if I am cross compiling, these tests will fail. I am building the compiler rt for my target, but I need the compiler rt to pass the tests. this is circular dependency.

I have now added this:
set(TEST_COMPILE_ONLY ON)
before line 241, link above.

has anyone else run into this? how have they worked around this?