From 337af6e23f6d3264136c16565546244da23159ba Mon Sep 17 00:00:00 2001
From: Martin Moene <martin.moene@gmail.com>
Date: Sun, 10 Oct 2021 13:31:34 +0200
Subject: [PATCH] Add CMakeLists.txt for examples

https://github.com/martinmoene/nonstd-lite-project/issues/56
---
 CMakeLists.txt         |  2 +-
 example/CMakeLists.txt | 79 +++++++++++++++++++++++++++++++++---------
 2 files changed, 64 insertions(+), 17 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 072f8bf..e7ce056 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+cmake_minimum_required( VERSION 3.8 FATAL_ERROR )
 
 # span-lite project and version, updated by script/update-version.py:
 
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
index 4b47459..3dadea3 100644
--- a/example/CMakeLists.txt
+++ b/example/CMakeLists.txt
@@ -1,4 +1,4 @@
-# Copyright 2018-2019 by Martin Moene
+# Copyright 2018-2021 by Martin Moene
 #
 # https://github.com/martinmoene/span-lite
 #
@@ -6,46 +6,93 @@
 # (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 if( NOT DEFINED CMAKE_MINIMUM_REQUIRED_VERSION )
-    cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+    cmake_minimum_required( VERSION 3.8 FATAL_ERROR )
 endif()
 
 project( example LANGUAGES CXX )
 
 set( unit_name "span" )
 set( PACKAGE   ${unit_name}-lite )
+set( PROGRAM   ${unit_name}-lite )
 
-message( STATUS "Subproject '${PROJECT_NAME}'")
+message( STATUS "Subproject '${PROJECT_NAME}', examples '${PROGRAM}-*'")
 
 # Target default options and definitions:
 
 set( OPTIONS "" )
-set( DEFINITIONS "" )
+#set( DEFINITIONS "" )
 
-# Sources (.cpp) and their base names:
+# Sources (.cpp), normal and no-exception, and their base names:
 
 set( SOURCES
     01-basic.cpp
     02-span.cpp
 )
 
-string( REPLACE ".cpp" "" BASENAMES "${SOURCES}" )
+set( SOURCES_NE
+)
+
+string( REPLACE ".cpp" "" BASENAMES    "${SOURCES}" )
+string( REPLACE ".cpp" "" BASENAMES_NE "${SOURCES_NE}" )
+
+# Determine options:
+
+if( MSVC )
+    message( STATUS "Matched: MSVC")
+
+    set( BASE_OPTIONS -W3 )
+    set( EXCEPTIONS_OPTIONS ${BASE_OPTIONS} -EHsc )
+    set( NO_EXCEPTIONS_OPTIONS ${BASE_OPTIONS} )
+
+elseif( CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang|AppleClang" )
+    message( STATUS "CompilerId: '${CMAKE_CXX_COMPILER_ID}'")
+
+    set( BASE_OPTIONS -Wall -Wextra -Wconversion -Wsign-conversion -Wno-missing-braces -fno-elide-constructors )
+    set( EXCEPTIONS_OPTIONS ${BASE_OPTIONS} )
+    set( NO_EXCEPTIONS_OPTIONS -fno-exceptions )
+
+elseif( CMAKE_CXX_COMPILER_ID MATCHES "Intel" )
+    # as is
+    message( STATUS "Matched: Intel")
+else()
+    # as is
+    message( STATUS "Matched: nothing")
+endif()
+
+# Function to emulate ternary operaton `result = b ? x : y`:
+
+macro( ternary var boolean value1 value2 )
+    if( ${boolean} )
+        set( ${var} ${value1} )
+    else()
+        set( ${var} ${value2} )
+    endif()
+endmacro()
 
 # Function to create a target:
 
-function( make_target source )
-    string( REPLACE ".cpp" "" target "${source}" )
-    add_executable            ( ${target} ${source}  )
-    target_link_libraries     ( ${target} PRIVATE ${PACKAGE} )
-    target_compile_options    ( ${target} PRIVATE ${OPTIONS} )
-    target_compile_definitions( ${target} PRIVATE ${DEFINITIONS} )
-endfunction()
+function( make_target name no_exceptions )
+    ternary( ne no_exceptions "-ne" "" )
 
-# Targets:
+    add_executable             ( ${PROGRAM}-${name}${ne} ${name}.cpp )
+    target_include_directories ( ${PROGRAM}-${name}${ne} PRIVATE ../../variant-lite/include )
+    target_link_libraries      ( ${PROGRAM}-${name}${ne} PRIVATE ${PACKAGE} )
+    if ( no_exceptions )
+        target_compile_options ( ${PROGRAM}-${name}${ne} PRIVATE ${NO_EXCEPTIONS_OPTIONS} )
+    else()
+        target_compile_options ( ${PROGRAM}-${name}${ne} PRIVATE ${EXCEPTIONS_OPTIONS} )
+    endif()
 
-enable_testing()
+endfunction()
+
+# Create targets:
 
 foreach( target ${BASENAMES} )
-    make_target( ${target} )
+    make_target( ${target} FALSE )
+endforeach()
+
+foreach( target ${BASENAMES_NE} )
+    make_target( ${target} TRUE )
 endforeach()
 
 # end of file