Enable CMake to build (not test) in 1.2.

This is useful so we can at least check that it compiles on
Windows. We don't bother fixing the tests or testing infra (as has
been done in 1.4 branch) as we expect most development to happen
there. The CMake files will not be included in the distrubution and
are used for development/testing only.

CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.7)
+
+project(TCLAP VERSION 1.2.2)
+
+set(CMAKE_CXX_STANDARD 98)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+add_subdirectory(examples)

examples/CMakeLists.txt

@@ -0,0 +1,27 @@
+SET( CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${OUTPUT_DIRECTORY}")
+SET( CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE "${OUTPUT_DIRECTORY}")
+
+SET(gcc_like_cxx "$<OR:$<CXX_COMPILER_ID:ARMClang>,$<CXX_COMPILER_ID:AppleClang>,$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:GNU>>")
+SET(msvc_cxx "$<CXX_COMPILER_ID:MSVC>")
+  
+function(default_opts target)
+target_compile_options(${target} PRIVATE
+    "$<${gcc_like_cxx}:$<BUILD_INTERFACE:-Wall;-Wextra;-Weffc++>>"
+    "$<${msvc_cxx}:$<BUILD_INTERFACE:-W3>>"
+)
+endfunction(default_opts)
+
+function(add_example name)
+    add_executable(${name} ${ARGN})
+    target_include_directories(${name} PUBLIC ../include/ ${PROJECT_BINARY_DIR})
+    default_opts(${name})
+endfunction()
+
+# Check we don't define any hard symbols in the headers
+add_example(test-hard test-hard-1.cpp test-hard-2.cpp)
+
+file(GLOB TEST_FILES test[0-9]*.cpp)
+foreach(file ${TEST_FILES})
+    get_filename_component(file_basename ${file} NAME_WE)
+    add_example(${file_basename} ${file})
+endforeach()

examples/Makefile.am

@@ -20,7 +20,7 @@ test13_SOURCES = test13.cpp
 test14_SOURCES = test14.cpp
 test15_SOURCES = test15.cpp
 test16_SOURCES = test16.cpp
-test17_SOURCES = test17.cpp test17-a.cpp
+test17_SOURCES = test-hard-1.cpp test-hard-2.cpp
 test18_SOURCES = test18.cpp
 test19_SOURCES = test19.cpp
 test20_SOURCES = test20.cpp