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## ---------------------------------------------------------------------
##
## Copyright (C) 2012 - 2016 by the deal.II authors
##
## This file is part of the deal.II library.
##
## The deal.II library is free software; you can use it, redistribute
## it, and/or modify it under the terms of the GNU Lesser General
## Public License as published by the Free Software Foundation; either
## version 2.1 of the License, or (at your option) any later version.
## The full text of the license can be found in the file LICENSE at
## the top level of the deal.II distribution.
##
## ---------------------------------------------------------------------
#
# Setup default compiler flags: This file sets up sensible default compiler
# flags for the various platforms, compilers and build targets supported by
# the deal.II library.
#
#
# ####################
# # FAT NOTE: #
# ####################
#
# All configuration in setup_compiler_flags.cmake and
# setup_compiler_flags_<compiler>.cmake shall ONLY modify:
#
# DEAL_II_CXX_FLAGS
# DEAL_II_CXX_FLAGS_DEBUG
# DEAL_II_CXX_FLAGS_RELEASE
# DEAL_II_LINKER_FLAGS
# DEAL_II_LINKER_FLAGS_DEBUG
# DEAL_II_LINKER_FLAGS_RELEASE
# DEAL_II_DEFINITIONS
# DEAL_II_DEFINITIONS_DEBUG
# DEAL_II_DEFINITIONS_RELEASE
# DEAL_II_USER_DEFINITIONS
# DEAL_II_USER_DEFINITIONS_DEBUG
# DEAL_II_USER_DEFINITIONS_RELEASE
#
# All modifications shall be guarded with the ENABLE_IF_SUPPORTED
# or ENABLE_IF_LINKS macro, e.g.
#
# ENABLE_IF_SUPPORTED(DEAL_II_CXX_FLAGS "-fpic")
# ENABLE_IF_LINKS(DEAL_II_LINKER_FLAGS "-Wl,--as-needed")
#
# Checks for compiler features (such as C++11 support) and compiler
# specific bugs that
# - usually set up further configuration (such as preprocessor
# definitions)
# - disable a specific flag for a specific compiler version.
#
# belong the corresponding file:
#
# ./cmake/checks/check_01_cpu_features.cmake
# ./cmake/checks/check_01_cxx_features.cmake
# ./cmake/checks/check_02_compiler_features.cmake
# ./cmake/checks/check_02_system_features.cmake
# ./cmake/checks/check_03_compiler_bugs.cmake
#
########################################################################
# #
# Sanity checks: #
# #
########################################################################
#
# Check the user provided CXX flags:
#
FOREACH(build ${DEAL_II_BUILD_TYPES})
CHECK_COMPILER_SETUP(
"${DEAL_II_CXX_FLAGS_SAVED} ${DEAL_II_CXX_FLAGS_${build}_SAVED}"
"${DEAL_II_LINKER_FLAGS_SAVED} ${DEAL_II_LINKER_FLAGS_${build}_SAVED}"
DEAL_II_HAVE_USABLE_USER_FLAGS_${build}
${DEAL_II_LIBRARIES} ${DEAL_II_LIBRARIES_${build}}
)
IF(NOT DEAL_II_HAVE_USABLE_USER_FLAGS_${build})
MESSAGE(FATAL_ERROR "
Configuration error: Cannot compile with the user supplied flags:
CXX flags (${build}): ${DEAL_II_CXX_FLAGS_SAVED} ${DEAL_II_CXX_FLAGS_${build}_SAVED}
LD flags (${build}): ${DEAL_II_LINKER_FLAGS_SAVED} ${DEAL_II_LINKER_FLAGS_${build}_SAVED}
LIBRARIES (${build}): ${DEAL_II_LIBRARIES};${DEAL_II_LIBRARIES_${build}}
Please check the CMake variables
DEAL_II_CXX_FLAGS, DEAL_II_CXX_FLAGS_${build},
DEAL_II_LINKER_FLAGS, DEAL_II_CXX_FLAGS_${build}
and the environment variables CXXFLAGS, LDFLAGS.\n\n"
)
ENDIF()
ENDFOREACH()
########################################################################
# #
# Compiler setup: #
# #
########################################################################
IF(DEAL_II_SETUP_DEFAULT_COMPILER_FLAGS)
#
# *Hooray* We are allowed to set compiler flags :-]
#
#
# General setup for GCC and compilers sufficiently close to GCC:
#
IF( CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR
CMAKE_CXX_COMPILER_ID MATCHES "Clang" )
VERBOSE_INCLUDE(${CMAKE_SOURCE_DIR}/cmake/setup_compiler_flags_gnu.cmake)
SET(DEAL_II_KNOWN_COMPILER TRUE)
ENDIF()
#
# Setup for ICC compiler (version >= 10):
#
IF(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
VERBOSE_INCLUDE(${CMAKE_SOURCE_DIR}/cmake/setup_compiler_flags_intel.cmake)
SET(DEAL_II_KNOWN_COMPILER TRUE)
ENDIF()
#
# Setup for MSVC compiler (version >= 2012):
#
IF(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
VERBOSE_INCLUDE(${CMAKE_SOURCE_DIR}/cmake/setup_compiler_flags_msvc.cmake)
SET(DEAL_II_KNOWN_COMPILER TRUE)
ENDIF()
IF(NOT DEAL_II_KNOWN_COMPILER)
MESSAGE(FATAL_ERROR "\n"
"Unknown compiler!\n"
"If you're serious about it, set DEAL_II_SETUP_DEFAULT_COMPILER_FLAGS=OFF "
"and set the relevant compiler options by hand.\n\n"
)
ENDIF()
ELSE(DEAL_II_SETUP_DEFAULT_COMPILER_FLAGS)
MESSAGE(STATUS
"Skipped setup of default compiler flags "
"(DEAL_II_SETUP_DEFAULT_COMPILER_FLAGS=OFF)"
)
ENDIF(DEAL_II_SETUP_DEFAULT_COMPILER_FLAGS)
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