/usr/lib/x86_64-linux-gnu/cmake/ignition-cmake0/cmake0/IgnSetCompilerFlags.cmake is in libignition-cmake-dev 0.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# IgnSetCompilerFlags
# -------------------
#
# ign_set_compiler_flags()
#
# Sets up compiler flags for an ignition library project
#
#===============================================================================
# Copyright (C) 2017 Open Source Robotics Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#################################################
# Set up compiler flags
macro(ign_set_compiler_flags)
option(USE_IGN_RECOMMENDED_FLAGS "Build project using the compiler flags recommended by the ignition developers" ON)
if(MSVC)
ign_setup_msvc()
elseif(UNIX)
ign_setup_unix()
endif()
if(APPLE)
ign_setup_apple()
endif()
# Check if we are compiling with Clang and cache it
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
set(CLANG true)
endif()
# Check if we are compiling with GCC and cache it
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
set(GCC true)
endif()
# GCC and Clang use many of the same compilation flags, so it might be useful
# to have a variable that indicates if one of them is being used.
if(GCC OR CLANG)
set(GCC_OR_CLANG true)
endif()
if(GCC_OR_CLANG)
if(USE_IGN_RECOMMENDED_FLAGS)
ign_setup_gcc_or_clang()
endif()
option(USE_HOST_SSE_FLAGS "Explicitly use compiler flags to indicate the SSE version of the host machine" TRUE)
if(USE_HOST_SSE_FLAGS)
ign_set_sse_flags()
endif()
endif()
endmacro()
#################################################
# Configure settings for Unix
macro(ign_setup_unix)
find_program(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin )
if(CMAKE_UNAME)
exec_program(${CMAKE_UNAME} ARGS -m OUTPUT_VARIABLE CMAKE_SYSTEM_PROCESSOR)
set(CMAKE_SYSTEM_PROCESSOR ${CMAKE_SYSTEM_PROCESSOR} CACHE INTERNAL
"processor type (i386 and x86_64)")
if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
set(IGN_ADD_fPIC_TO_LIBRARIES true)
endif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
endif(CMAKE_UNAME)
endmacro()
#################################################
macro(ign_setup_apple)
# NOTE MacOSX provides different system versions than CMake is parsing.
# The following table lists the most recent OSX versions
# 9.x.x = Mac OSX Leopard (10.5)
# 10.x.x = Mac OSX Snow Leopard (10.6)
# 11.x.x = Mac OSX Lion (10.7)
# 12.x.x = Mac OSX Mountain Lion (10.8)
if(${CMAKE_SYSTEM_VERSION} LESS 10)
add_definitions(-DMAC_OS_X_VERSION=1050)
elseif(${CMAKE_SYSTEM_VERSION} GREATER 10 AND ${CMAKE_SYSTEM_VERSION} LESS 11)
add_definitions(-DMAC_OS_X_VERSION=1060)
elseif(${CMAKE_SYSTEM_VERSION} GREATER 11 AND ${CMAKE_SYSTEM_VERSION} LESS 12)
add_definitions(-DMAC_OS_X_VERSION=1070)
elseif(${CMAKE_SYSTEM_VERSION} GREATER 12 OR ${CMAKE_SYSTEM_VERSION} EQUAL 12)
add_definitions(-DMAC_OS_X_VERSION=1080)
# Use libc++ on Mountain Lion (10.8)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
else()
add_definitions(-DMAC_OS_X_VERSION=0)
endif()
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-undefined -Wl,dynamic_lookup")
endmacro()
#################################################
# Set up compilation flags for GCC or Clang
macro(ign_setup_gcc_or_clang)
ign_filter_valid_compiler_options(
CUSTOM_ALL_FLAGS
-Wall -Wextra -Wno-long-long -Wno-unused-value -Wfloat-equal
-Wshadow -Winit-self -Wswitch-default -Wmissing-include-dirs -pedantic
-fvisibility)
# -ggdb3: Produce comprehensive debug information that can be utilized by gdb
set(CUSTOM_DEBUG_FLAGS "-ggdb3")
# We use the default flags for Release
set(CUSTOM_RELEASE_FLAGS "")
# -UNDEBUG: Undefine the NDEBUG symbol so that assertions get triggered in
# RelWithDebInfo mode
# NOTE: Always make -UNDEBUG the first flag in this list so that it appears
# immiediately after cmake's automatically provided -DNDEBUG flag.
# Keeping them next to each other should make it more clear that the
# -DNDEBUG flag is being canceled out.
set(CUSTOM_RELWITHDEBINFO_FLAGS "-UNDEBUG")
# We use the default flags for MinSizeRel
set(CUSTOM_MINSIZEREL_FLAGS "")
# -fno-omit-frame-pointer: TODO Why do we use this?
# -g: Produce debug information
# -pg: Produce information that is helpful for the gprof profiling tool
set(CUSTOM_PROFILE_FLAGS "-fno-omit-frame-pointer -g -pg")
# -g: Produce debug information.
# -O0: Do absolutely no performance optimizations and reduce compilation time.
# -Wformat=2: Print extra warnings for string formatting functions.
# --coverage: Tell the compiler that we want our build to be instrumented for
# coverage analysis.
# -fno-inline: Prevent the compiler from inlining functions. Inlined functions
# may confuse the coverage analysis.
set(CUSTOM_C_COVERAGE_FLAGS "-g -O0 -Wformat=2 --coverage -fno-inline")
set(CUSTOM_CXX_COVERAGE_FLAGS "${CUSTOM_C_COVERAGE_FLAGS}")
# We add these flags depending on whether the compiler can support them,
# because they cause errors when compiling with Clang.
# -fno-elide-constructors: Prevent the compiler from eliding constructors.
# Elision may confuse the coverage analysis.
# -fno-default-inline: Prevent class members that are defined inside of their
# class definition from automatically being marked as
# inline functions.
# ...TODO: Is this redundant with -fno-inline?
# -fno-implicit-inline-templates: TODO: Why do we use this?
ign_filter_valid_compiler_options(
CUSTOM_CXX_COVERAGE_FLAGS
-fno-elide-constructors
-fno-default-inline
-fno-implicit-inline-templates)
# NOTE We do not use the CACHE argument when appending flags to these
# variables, because appending to the CACHE will make these variables grow
# with redundant flags each time cmake is run. By not using CACHE, we create
# "local" copies of each of these variables, so they will not be preserved
# between runs of cmake. However, since these "local" variables are created in
# the top-level scope, they will be visible to all subdirectories in our
# filesystem, making them effectively global.
# NOTE These flags are being specified in a very particular order. First, we
# specify the original set of flags, then we specify the set of flags which
# are being passed to all build types, then we specify the set of flags which
# are specific to each build type. When contradictory flags are given to a
# compiler, whichever flag was specified last gets precedence. Therefore, we
# want the flags that we're passing in now to have precedence over the
# original flags for each build type, and we want the flags that are specific
# to each build type to have precedence over the flags that are passed to all
# build types, to make sure that each build type can customize its flags
# without any conflicts.
# cmake automatically provides -g for *_FLAGS_DEBUG
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${CUSTOM_ALL_FLAGS} ${CUSTOM_DEBUG_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${CUSTOM_ALL_FLAGS} ${CUSTOM_DEBUG_FLAGS}")
# cmake automatically provides -O3 and -DNDEBUG for *_FLAGS_RELEASE
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${CUSTOM_RELEASE_FLAGS} ${CUSTOM_ALL_FLAGS}")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CUSTOM_ALL_FLAGS} ${CUSTOM_RELEASE_FLAGS}")
# cmake automatically provides -g, -O2, and -DNDEBUG for *_FLAGS_RELWITHDEBINFO
set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} ${CUSTOM_ALL_FLAGS} ${CUSTOM_RELWITHDEBINFO_FLAGS}")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${CUSTOM_ALL_FLAGS} ${CUSTOM_RELWITHDEBINFO_FLAGS}")
# cmake automatically provides -Os and -DNDEBUG for *_FLAGS_MINSIZEREL
set(CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} ${CUSTOM_ALL_FLAGS} ${CUSTOM_MINSIZEREL_FLAGS}")
set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} ${CUSTOM_ALL_FLAGS} ${CUSTOM_MINSIZEREL_FLAGS}")
# PROFILE is a custom build type, not automatically provided by cmake
set(CMAKE_C_FLAGS_PROFILE "${CMAKE_C_FLAGS_PROFILE} ${CUSTOM_ALL_FLAGS} ${CUSTOM_PROFILE_FLAGS}")
set(CMAKE_CXX_FLAGS_PROFILE "${CMAKE_CXX_FLAGS_PROFILE} ${CUSTOM_ALL_FLAGS} ${CUSTOM_PROFILE_FLAGS}")
# COVERAGE is a custom build type, not automatically provided by cmake
set(CMAKE_C_FLAGS_COVERAGE "${CMAKE_C_FLAGS_COVERAGE} ${CUSTOM_ALL_FLAGS} ${CUSTOM_C_COVERAGE_FLAGS}")
set(CMAKE_CXX_FLAGS_COVERAGE "${CMAKE_CXX_FLAGS_COVERAGE} ${CUSTOM_ALL_FLAGS} ${CUSTOM_CXX_COVERAGE_FLAGS}")
# NOTE: Leave CMAKE_C_FLAGS and CMAKE_CXX_FLAGS blank, because those will
# be appended to all build configurations.
endmacro()
#################################################
# Identify what type of Streaming SIMD Extension is being used by the system and
# then set the compiler's SSE flags appropriately.
macro(ign_set_sse_flags)
message(STATUS "\n-- Searching for host SSE information")
include(IgnCheckSSE)
if(SSE2_FOUND)
add_compile_options(-msse -msse2)
if (NOT APPLE)
add_compile_options(-mfpmath=sse)
message(STATUS "SSE2 found")
endif()
endif()
if(SSE3_FOUND)
add_compile_options(-msse3)
message(STATUS "SSE3 found")
endif()
if (SSSE3_FOUND)
add_compile_options(-mssse3)
endif()
if (SSE4_1_FOUND OR SSE4_2_FOUND)
if (SSE4_1_FOUND)
add_compile_options(-msse4.1)
message(STATUS "SSE4.1 found")
endif()
if (SSE4_2_FOUND)
add_compile_options(-msse4.2)
message(STATUS "SSE4.2 found")
endif()
else()
message(STATUS "SSE4 disabled.\n--")
endif()
endmacro()
#################################################
# Set up compilation flags for Microsoft Visual Studio/C++
macro(ign_setup_msvc)
# Reduce overhead by ignoring unnecessary Windows headers
add_definitions(-DWIN32_LEAN_AND_MEAN)
# Don't pull in the Windows min/max macros
add_definitions(-DNOMINMAX)
if (MSVC AND CMAKE_SIZEOF_VOID_P EQUAL 8)
# Not needed if a proper cmake generator (-G "...Win64") is passed
# to cmake. Enable as a second measure to work around bug
# http://www.cmake.org/Bug/print_bug_page.php?bug_id=11240
set(CMAKE_SHARED_LINKER_FLAGS "/machine:x64")
endif()
if(USE_IGN_RECOMMENDED_FLAGS)
# Gy: Prevent errors caused by multiply-defined symbols
# W2: Warning level 2: significant warnings.
# TODO: Recommend Wall in the future.
# Note: MSVC /Wall generates tons of warnings on gtest code.
set(MSVC_MINIMAL_FLAGS "/Gy /W2")
# Zi: Produce complete debug information
# Note: We provide Zi to ordinary release mode because it does not impact
# performance and can be helpful for debugging.
set(MSVC_DEBUG_FLAGS "${MSVC_MINIMAL_FLAGS} /Zi")
# GL: Enable Whole Program Optimization
set(MSVC_RELEASE_FLAGS "${MSVC_DEBUG_FLAGS} /GL")
# UNDEBUG: Undefine NDEBUG so that assertions can be triggered
set(MSVC_RELWITHDEBINFO_FLAGS "${MSVC_RELEASE_FLAGS} /UNDEBUG")
# cmake automatically provides /Zi /Ob0 /Od /RTC1
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${MSVC_DEBUG_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${MSVC_DEBUG_FLAGS}")
# cmake automatically provides /O2 /Ob2 /DNDEBUG
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${MSVC_RELEASE_FLAGS}")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${MSVC_RELEASE_FLAGS}")
# cmake automatically provides /Zi /O2 /Ob1 /DNDEBUG
set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} ${MSVC_RELWITHDEBINFO_FLAGS}")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${MSVC_RELWITHDEBINFO_FLAGS}")
# cmake automatically provides /O1 /Ob1 /DNDEBUG
set(CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} ${MSVC_MINIMAL_FLAGS}")
set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} ${MSVC_MINIMAL_FLAGS}")
# NOTE: Leave CMAKE_C_FLAGS and CMAKE_CXX_FLAGS blank, because
# those will be appended to all build configurations.
# TODO: What flags should be set for PROFILE and COVERAGE build types?
# Is it even possible to generate those build types on Windows?
endif()
# Use the dynamically loaded run-time library in Windows by default. The
# dynamically loaded run-time allows dynamically allocated objects to be
# passed between different DLLs, which is important for our plugin-based
# framework.
#
# In some cases, a user might want to compile with the static runtime. This
# should ONLY be done if they do not intend to use the ignition library as
# part of a plugin-based framework.
option(IGN_USE_STATIC_RUNTIME "Use the static runtime (strongly discouraged)" OFF)
if(BUILD_SHARED_LIBS)
# Users should not choose the static runtime unless they are compiling a
# static library, so we completely disable this option if BUILD_SHARED_LIBS
# is turned on.
set(IGN_USE_STATIC_RUNTIME OFF CACHE BOOL "Use the static runtime (strongly discouraged)" FORCE)
endif()
if(IGN_USE_STATIC_RUNTIME)
foreach(build_type DEBUG RELEASE RELWITHDEBINFO MINSIZEREL)
foreach(lang C CXX)
set(flags_var CMAKE_${lang}_FLAGS_${build_type})
string(REGEX REPLACE "/MD" "/MT" ${flags_var} "${${flags_var}}")
endforeach()
endforeach()
endif()
# We always want this flag to be specified so we get standard-compliant
# exception handling.
# EHsc: Use standard-compliant exception handling
add_compile_options("/EHsc")
endmacro()
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