adrido/minetest-mapper-cpp
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Use C++11 if possible

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This allows the use of more efficient (i.e. faster) data structures
like unordered_map.
This commit is contained in:
Rogier 2014-05-04 11:04:23 +02:00
parent f60fd0a9aa
commit 0aee764203
2 changed files with 67 additions and 2 deletions
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63
CMakeLists.txt
View File

@ -7,8 +7,67 @@ set(VERSION_MAJOR 1)
set(VERSION_MINOR 0) set(VERSION_MINOR 0)
set(VERSION_STRING "${VERSION_MAJOR}.${VERSION_MINOR}") set(VERSION_STRING "${VERSION_MAJOR}.${VERSION_MINOR}")
set(CMAKE_CXX_FLAGS_RELEASE "-std=c++0x -Wall -DNDEBUG") # try_compile does not remove the temporary build directory, so put it in CMakeFiles...
set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -std=c++0x -Wall -Wextra -DDEBUG") # Also: use absolute paths; cmake chokes on relative paths :-(
try_compile(CXX_C0X_SUPPORTED "${CMAKE_HOME_DIRECTORY}/CMakeFiles/CMakeTmp/c0x-test" "${CMAKE_HOME_DIRECTORY}/empty.cpp" CMAKE_FLAGS "-std=c++0x")
if(CXX_C0X_SUPPORTED)
# Yes, I *know* c++0x is *not* an official C++ standard...
message(STATUS "Compiler: C++ standard version 'c++0x' is supported")
elseif(CXX_C0X_SUPPORTED)
message(FATAL_ERROR "Compiler: C++ standard version c++0x is not supported")
endif(CXX_C0X_SUPPORTED)
try_compile(CXX_C11_SUPPORTED "${CMAKE_HOME_DIRECTORY}/CMakeFiles/CMakeTmp/c11-test" "${CMAKE_HOME_DIRECTORY}/empty.cpp" CMAKE_FLAGS "-std=c++11")
if(CXX_C11_SUPPORTED)
message(STATUS "Compiler: C++ standard version 'c++11' is supported")
else(CXX_C11_SUPPORTED)
message(STATUS "Compiler: C++ standard version 'c++11' is not supported")
endif(CXX_C11_SUPPORTED)
# Determine C++ standard to use
# If CXX_CXX_STANDARD is empty, use autodetected c++ standard version
set(CXX_CXX_STANDARD "" CACHE STRING "C++ standard version to use. Leave empty, or set to c++11 or c++0x")
string(COMPARE NOTEQUAL "${CXX_CXX_STANDARD}" "" CXX_CXX_STANDARD_OVERRIDE)
if(CXX_CXX_STANDARD_OVERRIDE)
string(COMPARE EQUAL "${CXX_CXX_STANDARD}" "c++11" CXX_C11_REQUESTED)
string(COMPARE EQUAL "${CXX_CXX_STANDARD}" "c++0x" CXX_C0X_REQUESTED)
if(CXX_C11_REQUESTED AND CXX_C11_SUPPORTED)
message(STATUS "Compiler: C++ standard version 'c++11' selected (as requested)")
set(CXX_USE_CXX_STANDARD "c++11")
elseif(CXX_C11_REQUESTED AND NOT CXX_C11_SUPPORTED)
message(FATAL_ERROR "Compiler: requested standard version '${CXX_CXX_STANDARD}' is not supported")
elseif(CXX_C0X_REQUESTED)
message(STATUS "Compiler: C++ standard version 'c++0x' selected (as requested)")
set(CXX_USE_CXX_STANDARD "c++0x")
else(CXX_C11_REQUESTED AND CXX_C11_SUPPORTED)
message(FATAL_ERROR "Unrecognised c++ standard version requested: ${CXX_CXX_STANDARD}")
endif(CXX_C11_REQUESTED AND CXX_C11_SUPPORTED)
else(CXX_CXX_STANDARD_OVERRIDE)
if(CXX_C11_SUPPORTED)
message(STATUS "Compiler: C++ standard version 'c++11' selected")
set(CXX_USE_CXX_STANDARD "c++11")
else(CXX_C11_SUPPORTED)
message(STATUS "Compiler: C++ standard version 'c++0x' selected (c++11 not supported)")
set(CXX_USE_CXX_STANDARD "c++0x")
endif(CXX_C11_SUPPORTED)
endif(CXX_CXX_STANDARD_OVERRIDE)
# Clean targets after change in c++ standard, and remember current standard
string(COMPARE EQUAL "${CXX_CXX_STANDARD_LAST}" "" FIRST_CXX_STANDARD)
string(COMPARE NOTEQUAL "${CXX_CXX_STANDARD_LAST}" "${CXX_USE_CXX_STANDARD}" DIFFERENT_CXX_STANDARD)
set(CXX_CXX_STANDARD_LAST_TEMP "${CXX_CXX_STANDARD_LAST}")
set(CXX_CXX_STANDARD_LAST "${CXX_USE_CXX_STANDARD}" CACHE INTERNAL "Internal use - do not modify")
if(DIFFERENT_CXX_STANDARD AND NOT FIRST_CXX_STANDARD)
execute_process(COMMAND "${CMAKE_BUILD_TOOL}" clean RESULT_VARIABLE CLEANING_RESULT OUTPUT_QUIET ERROR_QUIET)
if(CLEANING_RESULT)
message(STATUS "Clean previous build because of standard change (was: '${CXX_CXX_STANDARD_LAST_TEMP}') (exit: ${CLEANING_RESULT})")
else(CLEANING_RESULT)
message(STATUS "Clean previous build because of standard change (was: '${CXX_CXX_STANDARD_LAST_TEMP}')")
endif(CLEANING_RESULT)
endif(DIFFERENT_CXX_STANDARD AND NOT FIRST_CXX_STANDARD)
set(CMAKE_CXX_FLAGS_RELEASE "-std=${CXX_USE_CXX_STANDARD} -Wall -DNDEBUG")
set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -std=${CXX_USE_CXX_STANDARD} -Wall -Wextra -DDEBUG")
# Find libgd # Find libgd
find_library(LIBGD_LIBRARY gd) find_library(LIBGD_LIBRARY gd)

6
empty.cpp Normal file
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@ -0,0 +1,6 @@
// File used by cmake to check for c++11 support
// See: CmakeLists.txt
// Just a symbol named 'main' is required for compilation to succeed.
// It does not have to be a function :-)
int main;