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#
# Copyright (c) 2015-2016, Luca Fulchir<luca@fulchir.it>, All rights reserved.
#
# This file is part of "libRaptorQ".
#
# libRaptorQ is free software: you can 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 3
# of the License, or (at your option) any later version.
#
# libRaptorQ is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# and a copy of the GNU Lesser General Public License
# along with libRaptorQ.  If not, see <http://www.gnu.org/licenses/>.
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#
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include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)

##############################################
#### check for UBSAN sanitizing support ######
##############################################
if(CMAKE_BUILD_TYPE MATCHES "Debug")
    check_c_compiler_flag("-fsanitize=undefined" RQ_FLAG_C_UBSAN)
    check_cxx_compiler_flag("-fsanitize=undefined" RQ_FLAG_CXX_UBSAN)
    if (RQ_FLAG_C_UBSAN AND RQ_FLAG_CXX_UBSAN)
        set(RQ_ENABLE_UBSAN TRUE)
        set(RQ_UBSAN ubsan)
        message(STATUS "UBSAN sanitizing support enabled")
    else()
        message(STATUS "UBSAN sanitizing support disabled")
    endif()
endif()

###################
## Compiler options
###################
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#gnu options
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set(RQ_GNU_C_OPTIONS ${RQ_DETERMINISTIC} -std=c11 -Wno-unknown-pragmas -Wall -pedantic -Wno-padded  -fstack-protector-all -fstrict-aliasing -fwrapv -fvisibility=hidden )
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set(RQ_GNU_CXX_OPTIONS ${RQ_DETERMINISTIC} -std=c++11 -fno-rtti -fno-exceptions -Wno-unknown-pragmas -Wall -pedantic -Wno-padded -Wno-unknown-pragmas -fstack-protector-all -fstrict-aliasing -fwrapv -fvisibility=hidden -fvisibility-inlines-hidden )
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# GCC internal compiler errors with:
# -fsanitize=undefined
# -fsanitize=null
# -fsanitize=signed-integer-overflow
set(RQ_GNU_C_DEBUG   -O0 -g -Wno-aggressive-loop-optimizations -ftrapv )
set(RQ_GNU_CXX_DEBUG -O0 -g -Wno-aggressive-loop-optimizations -ftrapv )
set(RQ_GNU_C_DEBUG_SANITIZE   -fsanitize=shift -fsanitize=integer-divide-by-zero -fsanitize=vla-bound -fsanitize=return -fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute )
set(RQ_GNU_CXX_DEBUG_SANITIZE -fsanitize=shift -fsanitize=integer-divide-by-zero -fsanitize=vla-bound -fsanitize=return -fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute )
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set(RQ_GNU_C_MINSIZEREL   -Os )
set(RQ_GNU_CXX_MINSIZEREL -Os )
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set(RQ_GNU_C_RELEASE   -Ofast -DNDEBUG -fwrapv )
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set(RQ_GNU_CXX_RELEASE -Ofast -DNDEBUG -fwrapv )
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set(RQ_GNU_C_RELWITHDEBINFO   ${RQ_GNU_C_RELEASE} -g )
set(RQ_GNU_CXX_RELWITHDEBINFO ${RQ_GNU_CXX_RELEASE} -g )

# clang options
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set(RQ_CLANG_C_OPTIONS ${RQ_DETERMINISTIC} -std=c11 -Wall -pedantic -Weverything -Wno-padded -fstack-protector-all -fstrict-aliasing -Wformat -Wformat-security -Wno-disabled-macro-expansion -fvisibility=hidden -fvisibility-inlines-hidden)
set(RQ_CLANG_CXX_OPTIONS ${RQ_STDLIB_FLAG} ${RQ_DETERMINISTIC} -std=c++11 -fno-rtti -fno-exceptions -Wall -pedantic -Weverything -Wno-c++98-compat-pedantic -Wno-c++98-compat -Wno-padded -Wno-unknown-pragmas -fstack-protector-all -fstrict-aliasing -Wformat -Wformat-security -fvisibility=hidden -fvisibility-inlines-hidden)
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set(RQ_CLANG_C_DEBUG   -O0 -g )
set(RQ_CLANG_CXX_DEBUG -O0 -g )
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set(RQ_CLANG_C_DEBUG_SANITIZE   -fsanitize=shift -fsanitize=integer-divide-by-zero -fsanitize=vla-bound -fsanitize=return )
set(RQ_CLANG_CXX_DEBUG_SANITIZE -fsanitize=shift -fsanitize=integer-divide-by-zero -fsanitize=vla-bound -fsanitize=return )
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set(RQ_CLANG_C_MINSIZEREL   -Os )
set(RQ_CLANG_CXX_MINSIZEREL -Os )
set(RQ_CLANG_C_RELEASE   -Ofast -DNDEBUG -fwrapv )
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set(RQ_CLANG_CXX_RELEASE -Ofast -DNDEBUG -fwrapv )
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set(RQ_CLANG_C_RELWITHDEBINFO   ${RQ_CLANG_C_RELEASE} -g )
set(RQ_CLANG_CXX_RELWITHDEBINFO ${RQ_CLANG_CXX_RELEASE} -g )

# msvc flags. todo?
set(MSVC_C_OPTIONS )
set(MSVC_CXX_OPTIONS )
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###################
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# combine the above
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###################
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# note: generator expansions do not work on "set(..)"
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
    set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_CLANG_CXX_OPTIONS})
    if(CMAKE_BUILD_TYPE MATCHES "Debug")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_CLANG_CXX_DEBUG})
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        if (RQ_ENABLE_UBSAN)
            set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_CLANG_CXX_DEBUG_SANITIZE})
        endif()
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    elseif(CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_CLANG_CXX_MINSIZEREL})
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    elseif(CMAKE_BUILD_TYPE MATCHES "Release")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_CLANG_CXX_RELEASE})
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    elseif(CMAKE_BUILD_TYPE MATCHES "RelWithDebInfo")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_CLANG_CXX_RELWITHDEBINFO})
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    endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
    set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_GNU_CXX_OPTIONS})
    if(CMAKE_BUILD_TYPE MATCHES "Debug")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_GNU_CXX_DEBUG})
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        if (RQ_ENABLE_UBSAN)
            set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_GNU_CXX_DEBUG_SANITIZE})
        endif()
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    elseif(CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_GNU_CXX_MINSIZEREL})
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    elseif(CMAKE_BUILD_TYPE MATCHES "Release")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_GNU_CXX_RELEASE})
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    elseif(CMAKE_BUILD_TYPE MATCHES "RelWithDebInfo")
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        set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_LIST_CXX_COMPILER_FLAGS} ${RQ_GNU_CXX_RELWITHDEBINFO})
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    endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
    set(RQ_LIST_CXX_COMPILER_FLAGS ${RQ_MSVC_CXX_OPTIONS})
endif()


if(CMAKE_C_COMPILER_ID MATCHES "Clang")
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    set(RQ_LIST_C_COMPILER_FLAGS ${RQ_CLANG_C_OPTIONS})
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    if(CMAKE_BUILD_TYPE MATCHES "Debug")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_CLANG_C_DEBUG})
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        if (RQ_ENABLE_UBSAN)
            set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_CLANG_C_DEBUG_SANITIZE})
        endif()
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    elseif(CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_CLANG_C_MINSIZEREL})
    elseif(CMAKE_BUILD_TYPE MATCHES "Release")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_CLANG_C_RELEASE})
    elseif(CMAKE_BUILD_TYPE MATCHES "RelWithDebInfo")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_CLANG_C_RELWITHDEBINFO})
    endif()
elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
    set(RQ_LIST_C_COMPILER_FLAGS ${RQ_GNU_C_OPTIONS})
    if(CMAKE_BUILD_TYPE MATCHES "Debug")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_GNU_C_DEBUG})
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        if (RQ_ENABLE_UBSAN)
            set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_GNU_C_DEBUG_SANITIZE})
        endif()
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    elseif(CMAKE_BUILD_TYPE MATCHES "MinSizeRel")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_GNU_C_MINSIZEREL})
    elseif(CMAKE_BUILD_TYPE MATCHES "Release")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_GNU_C_RELEASE})
    elseif(CMAKE_BUILD_TYPE MATCHES "RelWithDebInfo")
        set(RQ_LIST_C_COMPILER_FLAGS ${RQ_LIST_C_COMPILER_FLAGS} ${RQ_GNU_C_RELWITHDEBINFO})
    endif()
elseif(CMAKE_C_COMPILER_ID MATCHES "MSVC")
    set(RQ_LIST_C_COMPILER_FLAGS ${RQ_MSVC_C_OPTIONS})
endif()
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########################################
## Test all the previously enabled flags
########################################
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set(RQ_C_COMPILER_FLAGS "")
set(RQ_CXX_COMPILER_FLAGS "")

# check each C flag
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foreach(flag ${RQ_LIST_C_COMPILER_FLAGS})
    string(REPLACE "-" "_" RQ_FLAG2 ${flag})
    string(REPLACE "+" "_" RQ_FLAG1 ${RQ_FLAG2})
    string(REPLACE "=" "_" RQ_FLAG  ${RQ_FLAG1})
    check_c_compiler_flag(${flag} RQ_FLAG_C_${RQ_FLAG})
    if(RQ_FLAG_C_${RQ_FLAG})
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        set(C_COMPILER_FLAGS ${C_COMPILER_FLAGS} ${flag})
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    else()
        message(WARNING "flag \"${flag}\" can't be used in your C compiler")
    endif()
endforeach()

# check each c++ flag
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foreach(flag ${RQ_LIST_CXX_COMPILER_FLAGS})
    string(REPLACE "-" "_" RQ_FLAG2 ${flag})
    string(REPLACE "+" "_" RQ_FLAG1 ${RQ_FLAG2})
    string(REPLACE "=" "_" RQ_FLAG  ${RQ_FLAG1})
    check_cxx_compiler_flag(${flag} RQ_FLAG_CXX_${RQ_FLAG})
    if(RQ_FLAG_CXX_${RQ_FLAG})
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        set(CXX_COMPILER_FLAGS ${CXX_COMPILER_FLAGS} ${flag})
    else()
        message(WARNING "flag \"${flag}\" can't be used in your CXX compiler")
    endif()
endforeach()