Add test of all cmake -G generators. Ignore any errors from this as not all generators are expected to be usable on all machines. Help to increase coverage of the various generators and cmake.cxx itself.

Tests/CMakeLists.txt

@@ -516,6 +516,20 @@ ${CMake_BINARY_DIR}/bin/cmake -DVERSION=CVS -P ${CMake_SOURCE_DIR}/Utilities/Rel
     --test-command  UseX11)
   LIST(APPEND TEST_BUILD_DIRS "${CMake_BINARY_DIR}/Tests/X11")
 
+  if(NOT DEFINED CTEST_RUN_CMakeTestAllGenerators)
+    set(CTEST_RUN_CMakeTestAllGenerators ON)
+  endif(NOT DEFINED CTEST_RUN_CMakeTestAllGenerators)
+
+  IF(CTEST_RUN_CMakeTestAllGenerators)
+    ADD_TEST(CMakeTestAllGenerators ${CMAKE_CMAKE_COMMAND}
+        -D dir=${CMake_BINARY_DIR}/Tests/CMakeTestAllGenerators
+        -D CMake_SOURCE_DIR=${CMake_SOURCE_DIR}
+        -P ${CMake_SOURCE_DIR}/Tests/CMakeTestAllGenerators/RunCMake.cmake
+      )
+    LIST(APPEND TEST_BUILD_DIRS
+      "${CMake_BINARY_DIR}/Tests/CMakeTestAllGenerators")
+  ENDIF(CTEST_RUN_CMakeTestAllGenerators)
+
   ADD_TEST(LoadedCommandOneConfig  ${CMAKE_CTEST_COMMAND}
     --build-and-test
     "${CMake_SOURCE_DIR}/Tests/LoadCommandOneConfig"

Tests/CMakeTestAllGenerators/RunCMake.cmake

@@ -0,0 +1,95 @@
+if(NOT DEFINED CMake_SOURCE_DIR)
+  message(FATAL_ERROR "CMake_SOURCE_DIR not defined")
+endif()
+
+if(NOT DEFINED dir)
+  message(FATAL_ERROR "dir not defined")
+endif()
+
+# Analyze 'cmake --help' output for list of available generators:
+#
+execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${dir})
+execute_process(COMMAND ${CMAKE_COMMAND} --help
+  RESULT_VARIABLE result
+  OUTPUT_VARIABLE stdout
+  ERROR_VARIABLE stderr
+  WORKING_DIRECTORY ${dir})
+
+string(REPLACE ";" "\\;" stdout "${stdout}")
+string(REPLACE "\n" "E;" stdout "${stdout}")
+
+set(collecting 0)
+set(generators)
+foreach(eline ${stdout})
+  string(REGEX REPLACE "^(.*)E$" "\\1" line "${eline}")
+  if(collecting AND NOT line STREQUAL "")
+    if(line MATCHES "=")
+      string(REGEX REPLACE "^  (.+)= (.*)$" "\\1" gen "${line}")
+      if(gen MATCHES "[A-Za-z]")
+        string(REGEX REPLACE "^(.*[^ ]) +$" "\\1" gen "${gen}")
+        if(gen)
+          set(generators ${generators} ${gen})
+        endif()
+      endif()
+    else()
+      if(line MATCHES "^  [A-Za-z0-9]")
+        string(REGEX REPLACE "^  (.+)$" "\\1" gen "${line}")
+        string(REGEX REPLACE "^(.*[^ ]) +$" "\\1" gen "${gen}")
+        if(gen)
+          set(generators ${generators} ${gen})
+        endif()
+      endif()
+    endif()
+  endif()
+  if(line STREQUAL "The following generators are available on this platform:")
+    set(collecting 1)
+  endif()
+endforeach()
+
+# Also call with one non-existent generator:
+#
+set(generators ${generators} "BOGUS_CMAKE_GENERATOR")
+
+# Call cmake with -G on each available generator. We do not care if this
+# succeeds or not. We expect it *not* to succeed if the underlying packaging
+# tools are not installed on the system... This test is here simply to add
+# coverage for the various cmake generators, even/especially to test ones
+# where the tools are not installed.
+#
+message(STATUS "CTEST_FULL_OUTPUT (Avoid ctest truncation of output)")
+
+message(STATUS "CMake generators='${generators}'")
+
+# First setup a source tree to run CMake on.
+#
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_directory
+  ${CMake_SOURCE_DIR}/Tests/CTestTest/SmallAndFast
+  ${dir}/Source
+)
+
+foreach(g ${generators})
+  message(STATUS "cmake -G \"${g}\" ..")
+
+  # Create a binary directory for each generator:
+  #
+  execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory
+    ${dir}/Source/${g}
+    )
+
+  # Run cmake:
+  #
+  execute_process(COMMAND ${CMAKE_COMMAND} -G ${g} ..
+    RESULT_VARIABLE result
+    OUTPUT_VARIABLE stdout
+    ERROR_VARIABLE stderr
+    WORKING_DIRECTORY ${dir}/Source/${g}
+    )
+
+  message(STATUS "result='${result}'")
+  message(STATUS "stdout='${stdout}'")
+  message(STATUS "stderr='${stderr}'")
+  message(STATUS "")
+endforeach()
+
+message(STATUS "CMake generators='${generators}'")
+message(STATUS "CMAKE_COMMAND='${CMAKE_COMMAND}'")