Extend blt_check_code_compiles macro to handle dependencies

RELEASE-NOTES.md

@@ -17,6 +17,7 @@ The project release numbers follow [Semantic Versioning](http://semver.org/spec/
 
 ### Added
 - Added `blt_print_variables` macro to print variables in current scope, with regex filtering on variable names and values
+- Added `LINK_LIBRARIES` optional parameter to `blt_check_code_compiles` macro to allow for checking if a feature is available in a third-party library.
 - Added `CONFIGURATIONS` and `OMP_NUM_THREADS` options to `blt_add_benchmark`
 
 ### Fixed

cmake/BLTMacros.cmake

@@ -1557,6 +1557,7 @@ endmacro()
 ##------------------------------------------------------------------------------
 ## blt_check_code_compiles(CODE_COMPILES <variable>
 ##                         VERBOSE_OUTPUT <ON|OFF (default OFF)>
+##                         LINK_LIBRARIES <libs>
 ##                         SOURCE_STRING <quoted C++ program>)
 ##
 ## This macro checks if a snippet of C++ code compiles.
@@ -1570,13 +1571,15 @@ endmacro()
 ## CODE_COMPILES A boolean variable the contains the compilation result.
 ##
 ## VERBOSE_OUTPUT Optional parameter to output debug information (Default: off)
+##
+## LINK_LIBRARIES Optional parameter for a list of additional dependencies
 ##------------------------------------------------------------------------------
 macro(blt_check_code_compiles)
 
     set(options)
     set(singleValueArgs CODE_COMPILES VERBOSE_OUTPUT )
     # NOTE: SOURCE_STRING must be a multiValueArg otherwise CMake removes all semi-colons
-    set(multiValueArgs SOURCE_STRING)
+    set(multiValueArgs LINK_LIBRARIES SOURCE_STRING)
 
     # Parse the arguments to the macro
     cmake_parse_arguments(arg
@@ -1603,11 +1606,20 @@ macro(blt_check_code_compiles)
     string(RANDOM LENGTH 5 _rand)
     set(_fname ${CMAKE_CURRENT_BINARY_DIR}/_bltCheckCompiles${_rand}.cpp)
     file(WRITE ${_fname} "${arg_SOURCE_STRING}")
-    try_compile(${arg_CODE_COMPILES}
+    if(NOT DEFINED arg_LINK_LIBRARIES)
+        try_compile(${arg_CODE_COMPILES}
                 ${CMAKE_CURRENT_BINARY_DIR}/CMakeTmp
                 SOURCES ${_fname}
                 CXX_STANDARD ${CMAKE_CXX_STANDARD}
                 OUTPUT_VARIABLE _res)
+    else()
+        try_compile(${arg_CODE_COMPILES}
+                ${CMAKE_CURRENT_BINARY_DIR}/CMakeTmp
+                SOURCES ${_fname}
+                CXX_STANDARD ${CMAKE_CXX_STANDARD}
+                LINK_LIBRARIES ${arg_LINK_LIBRARIES}
+                OUTPUT_VARIABLE _res)
+    endif()
     file(REMOVE ${_fname})
 
     if(${arg_VERBOSE_OUTPUT})

tests/internal/unit/CMakeLists.txt

@@ -173,3 +173,29 @@ if(_hello_world_compiled)
 else()
   message(FATAL_ERROR "... failed to compile.")
 endif()
+
+if(ENABLE_HIP)
+  message(STATUS "Checking blt::hip_runtime in blt_check_code_compiles")
+  blt_check_code_compiles(CODE_COMPILES  _hello_world_with_libs_compiled
+                          VERBOSE_OUTPUT ON
+                          LINK_LIRBRARIES blt::hip_runtime
+                          SOURCE_STRING
+  [=[
+  #include <iostream>
+  #include "hip/hip_runtime.h"
+
+  int main(int, char**)
+  {
+
+      std::cout << "Hello World!" << std::endl;
+
+      return 0;
+  }
+  ]=])
+
+  if(_hello_world_with_libs_compiled)
+    message(STATUS "... passed")
+  else()
+    message(FATAL_ERROR "... failed to compile.")
+  endif()
+endif()