Tests/RunCMake/IAR: Extend tests to actually build

Extend the tests from commit 37e44707bc (IAR: Add tests covering IAR
toolchains, 2023-10-21) to actually drive the generated build system.

Tests/RunCMake/IAR/RunCMakeTest.cmake

diff --git a/Tests/RunCMake/IAR/RunCMakeTest.cmake b/Tests/RunCMake/IAR/RunCMakeTest.cmake
index 12cf66d..2fefa6a 100644
--- a/Tests/RunCMake/IAR/RunCMakeTest.cmake
+++ b/Tests/RunCMake/IAR/RunCMakeTest.cmake
@@ -8,6 +8,13 @@
   endif()
 endif()
 
+function(run_toolchain case)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${case}-build)
+  run_cmake_with_options(${case} ${ARGN})
+  set(RunCMake_TEST_NO_CLEAN 1)
+  run_cmake_command(${case}-build ${CMAKE_COMMAND} --build .)
+endfunction()
+
 foreach(_iar_toolchain IN LISTS _iar_toolchains)
   message(STATUS "Found IAR toolchain: ${_iar_toolchain}")
   cmake_path(GET _iar_toolchain PARENT_PATH BIN_DIR)
@@ -17,8 +24,8 @@
   # Sets the minimal requirements for linking each target architecture
   if(ARCH STREQUAL "avr")
     string(CONCAT LINK_OPTS
-      "-I${TOOLKIT_DIR}/../lib "
-      "-f ${TOOLKIT_DIR}/../src/template/lnk3s.xcl "
+      "-I${TOOLKIT_DIR}/lib "
+      "-f ${TOOLKIT_DIR}/src/template/lnk3s.xcl "
     )
   elseif(ARCH STREQUAL "rl78")
     string(CONCAT LINK_OPTS
@@ -41,30 +48,26 @@
     PATHS ${BIN_DIR}
     REQUIRED )
 
-  set(RunCMake_TEST_OPTIONS
+  run_toolchain(iar-c
     -DCMAKE_SYSTEM_NAME=Generic
     -DCMAKE_C_COMPILER=${_iar_toolchain}
     -DCMAKE_EXE_LINKER_FLAGS=${LINK_OPTS}
   )
-  run_cmake(iar-c)
 
-  set(RunCMake_TEST_OPTIONS
+  run_toolchain(iar-cxx
     -DCMAKE_SYSTEM_NAME=Generic
     -DCMAKE_CXX_COMPILER=${_iar_toolchain}
     -DCMAKE_EXE_LINKER_FLAGS=${LINK_OPTS}
   )
-  run_cmake(iar-cxx)
 
-  set(RunCMake_TEST_OPTIONS
+  run_toolchain(iar-asm
     -DCMAKE_SYSTEM_NAME=Generic
     -DCMAKE_ASM_COMPILER=${IAR_ASSEMBLER}
-    )
-  run_cmake(iar-asm)
+  )
 
-  set(RunCMake_TEST_OPTIONS
+  run_toolchain(iar-lib
     -DCMAKE_SYSTEM_NAME=Generic
     -DCMAKE_C_COMPILER=${_iar_toolchain}
     -DCMAKE_EXE_LINKER_FLAGS=${LINK_OPTS}
-    )
-  run_cmake(iar-lib)
+  )
 endforeach()