Add negative compilation tests.

CMakeLists.txt

@@ -137,20 +137,6 @@ add_library (gflags           ${GFLAGS_SRCS})
 add_library (gflags_nothreads ${GFLAGS_SRCS})
 set_target_properties (gflags_nothreads PROPERTIES COMPILE_DEFINITIONS NO_THREADS)
 
-# ----------------------------------------------------------------------------
-# testing
-
-# TODO(andreas) Replace Bash scripts such that tests can be run on Windows (e.g., Python).
-#               The gflags_unittest.sh script should best be replaced by multiple
-#               add_test commands in the test/CMakeLists.txt file.
-if (UNIX)
-  include (CTest)
-  if (BUILD_TESTING)
-    enable_testing ()
-    add_subdirectory (test)
-  endif ()
-endif ()
-
 # ----------------------------------------------------------------------------
 # installation
 if (WIN32)
@@ -165,8 +151,8 @@ else ()
   set (CONFIG_INSTALL_DIR  lib/cmake/${PACKAGE_NAME})
 endif ()
 
-install (TARGETS gflags         DESTINATION ${LIBRARY_INSTALL_DIR} EXPORT gflags-lib)
-install (FILES   ${PUBLIC_HDRS} DESTINATION ${INCLUDE_INSTALL_DIR}/${GFLAGS_NAMESPACE})
+install (TARGETS gflags gflags_nothreads DESTINATION ${LIBRARY_INSTALL_DIR} EXPORT gflags-lib)
+install (FILES   ${PUBLIC_HDRS}          DESTINATION ${INCLUDE_INSTALL_DIR}/${GFLAGS_NAMESPACE})
 
 file (RELATIVE_PATH INSTALL_PREFIX_REL2CONFIG_DIR "${CMAKE_INSTALL_PREFIX}/${CONFIG_INSTALL_DIR}" "${CMAKE_INSTALL_PREFIX}")
 configure_file (cmake/config.cmake.in  "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-config-install.cmake" @ONLY)
@@ -192,5 +178,19 @@ endif ()
 # ----------------------------------------------------------------------------
 # support direct use of build tree
 set (INSTALL_PREFIX_REL2CONFIG_DIR .)
-export (TARGETS gflags FILE "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-export.cmake")
+export (TARGETS gflags gflags_nothreads FILE "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-export.cmake")
 configure_file (cmake/config.cmake.in "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-config.cmake" @ONLY)
+
+# ----------------------------------------------------------------------------
+# testing - MUST follow the generation of the build tree config file
+
+# TODO(andreas) Replace Bash scripts such that tests can be run on Windows (e.g., Python).
+#               The gflags_unittest.sh script should best be replaced by multiple
+#               add_test commands in the test/CMakeLists.txt file.
+if (UNIX)
+  include (CTest)
+  if (BUILD_TESTING)
+    enable_testing ()
+    add_subdirectory (test)
+  endif ()
+endif ()

test/CMakeLists.txt

@@ -1,5 +1,7 @@
 ## gflags tests
 
+find_package (PythonInterp)
+
 # ----------------------------------------------------------------------------
 # output directories
 set (CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/Testing/bin")
@@ -18,11 +20,31 @@ link_libraries (gflags_nothreads)
 configure_file (gflags_unittest.cc gflags_unittest-main.cc COPYONLY)
 configure_file (gflags_unittest.cc gflags_unittest_main.cc COPYONLY)
 
+set (SRCDIR "${CMAKE_CURRENT_SOURCE_DIR}/nc")
+configure_file (gflags_nc.py.in "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/nc.py" @ONLY)
+
 add_executable (strip_flags gflags_strip_flags_test.cc)
 add_executable (unittest    gflags_unittest.cc)
 add_executable (unittest2   gflags_unittest-main.cc)
 add_executable (unittest3   gflags_unittest_main.cc)
 
+# ----------------------------------------------------------------------------
+# (negative) compilation tests
+if (PYTHON_EXECUTABLE)
+  macro (add_nc_test name)
+    add_test (
+      NAME nc_${name}
+      COMMAND "${PYTHON_EXECUTABLE}" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/nc.py" ${name}
+    )
+  endmacro ()
+
+  add_nc_test (sanity)
+  add_nc_test (swapped_args)
+  add_nc_test (int_instead_of_bool)
+  add_nc_test (bool_in_quotes)
+  add_nc_test (define_string_with_0)
+endif ()
+
 # ----------------------------------------------------------------------------
 # test commands
 add_test (

test/gflags_nc.py.in

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import subprocess
+import shutil
+
+CMAKE      = '@CMAKE_COMMAND@'
+TMPDIR     = '@TEMPDIR@'
+SRCDIR     = '@SRCDIR@'
+GFLAGS_DIR = '@gflags_BINARY_DIR@'
+
+if __name__ == "__main__":
+  if len(sys.argv) != 2:
+    sys.stderr.write(' '.join(['usage:', sys.argv[0], '<test_name>\n']))
+    sys.exit(1)
+  test_name = sys.argv[1]
+  bindir = os.path.join(TMPDIR, '_'.join(['nc', test_name]))
+  if TMPDIR == '':
+    sys.stderr.write('Temporary directory not set!\n')
+    sys.exit(1)
+  # create build directory
+  if os.path.isdir(bindir): shutil.rmtree(bindir)
+  os.makedirs(bindir)
+  # configure the build tree
+  if subprocess.call([CMAKE, '-Dgflags_DIR:PATH='+GFLAGS_DIR, '-DTEST_NAME:STRING='+test_name, SRCDIR], cwd=bindir) != 0:
+    sys.stderr.write('Failed to configure the build tree!\n')
+    sys.exit(1)
+  # try build, which is supposed to fail (except in case of the sanity check)
+  if subprocess.call([CMAKE, '--build', bindir], cwd=bindir) == 0 and test_name != 'sanity':
+    sys.stderr.write('Build expected to fail, but it succeeded!\n')
+    sys.exit(1)
+  sys.exit(0)

test/nc/CMakeLists.txt

@@ -0,0 +1,16 @@
+## gflags negative compilation tests
+
+cmake_minimum_required (VERSION 2.8)
+
+if (NOT TEST_NAME)
+  message (FATAL_ERROR "Missing TEST_NAME CMake flag")
+endif ()
+string (TOUPPER ${TEST_NAME} TEST_NAME_UPPER)
+
+project (gflags_nc_${TEST_NAME})
+
+find_package (gflags REQUIRED)
+include_directories (${gflags_INCLUDE_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/..")
+link_libraries (gflags_nothreads)
+add_definitions (-DTEST_${TEST_NAME_UPPER})
+add_executable (gflags_nc_${TEST_NAME} gflags_nc.cc)

test/nc/gflags_nc.cc

@@ -66,3 +66,8 @@ DEFINE_string(some_string_flag,
               "Trying to construct a string by passing 0 would cause a crash.");
 
 #endif
+
+int main(int, char **)
+{
+  return 0;
+}