CustomCommandGenerator: Add support for CROSSCOMPILING_EMULATOR

Teach the `add_custom_command` and `add_custom_target' commands to
substitute argv0 with the crosscompiling emulator if it is a target with
the `CROSSCOMPILING_EMULATOR` property set.

6 files changed, 93 insertions, 0 deletions

diff --git a/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand-build-check.cmake b/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand-build-check.cmake
new file mode 100644
index 0000000..e10b161
--- /dev/null
+++ b/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand-build-check.cmake
@@ -0,0 +1,5 @@
+foreach(output IN ITEMS output1 output2 output3 output4)
+  if(NOT EXISTS "${RunCMake_TEST_BINARY_DIR}/${output}")
+    message(FATAL_ERROR "Failed to create output: ${RunCMake_TEST_BINARY_DIR}/${output}")
+  endif()
+endforeach()
diff --git a/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand.cmake b/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand.cmake
new file mode 100644
index 0000000..67fa30f
--- /dev/null
+++ b/Tests/RunCMake/CrosscompilingEmulator/AddCustomCommand.cmake
@@ -0,0 +1,38 @@
+set(CMAKE_CROSSCOMPILING 1)
+
+# Executable: Return error code different from 0
+add_executable(generated_exe_emulator_expected simple_src_exiterror.cxx)
+
+# Executable: Return error code equal to 0
+add_executable(generated_exe_emulator_unexpected simple_src_exitsuccess.cxx)
+
+# DoesNotUseEmulator
+add_custom_command(OUTPUT output1
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output1)
+
+# DoesNotUseEmulator: The command will fail if emulator is prepended
+add_custom_command(OUTPUT output2
+  COMMAND ${CMAKE_COMMAND} -E echo "$<TARGET_FILE:generated_exe_emulator_unexpected>"
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output2
+  DEPENDS generated_exe_emulator_unexpected)
+
+# DoesNotUseEmulator: The command will fail if emulator is prepended
+add_custom_command(OUTPUT output3
+  COMMAND $<TARGET_FILE:generated_exe_emulator_unexpected>
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output3
+  DEPENDS generated_exe_emulator_unexpected)
+
+# UsesEmulator: The command only succeeds if the emulator is prepended
+#               to the command.
+add_custom_command(OUTPUT output4
+  COMMAND generated_exe_emulator_expected
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output4
+  DEPENDS generated_exe_emulator_expected)
+
+add_custom_target(ensure_build ALL
+  SOURCES
+    ${CMAKE_CURRENT_BINARY_DIR}/output1
+    ${CMAKE_CURRENT_BINARY_DIR}/output2
+    ${CMAKE_CURRENT_BINARY_DIR}/output3
+    ${CMAKE_CURRENT_BINARY_DIR}/output4
+)
diff --git a/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget-build-check.cmake b/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget-build-check.cmake
new file mode 100644
index 0000000..c621922
--- /dev/null
+++ b/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget-build-check.cmake
@@ -0,0 +1 @@
+include(${CMAKE_CURRENT_LIST_DIR}/AddCustomCommand-build-check.cmake)
diff --git a/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget.cmake b/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget.cmake
new file mode 100644
index 0000000..ced569f
--- /dev/null
+++ b/Tests/RunCMake/CrosscompilingEmulator/AddCustomTarget.cmake
@@ -0,0 +1,30 @@
+set(CMAKE_CROSSCOMPILING 1)
+
+# Executable: Return error code different from 0
+add_executable(generated_exe_emulator_expected simple_src_exiterror.cxx)
+
+# Executable: Return error code equal to 0
+add_executable(generated_exe_emulator_unexpected simple_src_exitsuccess.cxx)
+
+# DoesNotUseEmulator
+add_custom_target(generate_output1 ALL
+  ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output1)
+
+# DoesNotUseEmulator: The command will fail if emulator is prepended
+add_custom_target(generate_output2 ALL
+  ${CMAKE_COMMAND} -E echo "$<TARGET_FILE:generated_exe_emulator_unexpected>"
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output2
+  DEPENDS generated_exe_emulator_unexpected)
+
+# DoesNotUseEmulator: The command will fail if emulator is prepended
+add_custom_target(generate_output3 ALL
+  $<TARGET_FILE:generated_exe_emulator_unexpected>
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output3
+  DEPENDS generated_exe_emulator_unexpected)
+
+# UsesEmulator: The command only succeeds if the emulator is prepended
+#               to the command.
+add_custom_target(generate_output4 ALL
+  generated_exe_emulator_expected
+  COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_CURRENT_BINARY_DIR}/output4
+  DEPENDS generated_exe_emulator_expected)
diff --git a/Tests/RunCMake/CrosscompilingEmulator/RunCMakeTest.cmake b/Tests/RunCMake/CrosscompilingEmulator/RunCMakeTest.cmake
index 2581cfc..71aaad1 100644
--- a/Tests/RunCMake/CrosscompilingEmulator/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CrosscompilingEmulator/RunCMakeTest.cmake
@@ -6,3 +6,18 @@ set(RunCMake_TEST_OPTIONS
 run_cmake(CrosscompilingEmulatorProperty)
 run_cmake(TryRun)
 run_cmake(AddTest)
+
+function(CustomCommandGenerator_run_and_build case)
+  # Use a single build tree for a few tests without cleaning.
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${case}-build)
+  set(RunCMake_TEST_NO_CLEAN 1)
+  set(RunCMake_TEST_OPTIONS
+    "-DCMAKE_CROSSCOMPILING_EMULATOR=${PSEUDO_EMULATOR_CUSTOM_COMMAND}")
+  file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
+  file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
+  run_cmake(${case})
+  run_cmake_command(${case}-build ${CMAKE_COMMAND} --build .)
+endfunction()
+
+CustomCommandGenerator_run_and_build(AddCustomCommand)
+CustomCommandGenerator_run_and_build(AddCustomTarget)
diff --git a/Tests/RunCMake/CrosscompilingEmulator/simple_src_exitsuccess.cxx b/Tests/RunCMake/CrosscompilingEmulator/simple_src_exitsuccess.cxx
new file mode 100644
index 0000000..630adc6
--- /dev/null
+++ b/Tests/RunCMake/CrosscompilingEmulator/simple_src_exitsuccess.cxx
@@ -0,0 +1,4 @@
+int main(int, char **)
+{
+  return 0;
+}