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#
# This program source code file is part of KICAD, a free EDA CAD application.
#
# Copyright (C) 2007-2020 Kicad Developers, see AUTHORS.txt for contributors.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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
# along with this program; if not, you may find one here:
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# or you may search the http://www.gnu.org website for the version 2 license,
# or you may write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
# Only configure warnings for Clang and GCC
if( CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang" )
include( CheckCXXCompilerFlag )
# The SWIG-generated files tend to throw a lot of warnings, so
# we do not add the warnings directly to the flags here but instead
# keep track of them and add them to the flags later in a controlled manner
# (that way we can not put any warnings on the SWIG-generated files)
set( COMPILER_SUPPORTS_WARNINGS TRUE )
# Establish -Wall early, so specialized relaxations of this may come
# subsequently on the command line, such as in pcbnew/github/CMakeLists.txt
set( WARN_FLAGS_C "-Wall" )
set( WARN_FLAGS_CXX "-Wall" )
# Warn about missing override specifiers
CHECK_CXX_COMPILER_FLAG( "-Wsuggest-override" COMPILER_SUPPORTS_WSUGGEST_OVERRIDE )
if( COMPILER_SUPPORTS_WSUGGEST_OVERRIDE )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wsuggest-override" )
message( STATUS "Enabling warning -Wsuggest-override" )
endif()
# This is Clang's version of -Wsuggest-override
CHECK_CXX_COMPILER_FLAG( "-Winconsistent-missing-override" COMPILER_SUPPORTS_WINCONSISTENT_MISSING_OVERRIDE )
if( COMPILER_SUPPORTS_WINCONSISTENT_MISSING_OVERRIDE )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Winconsistent-missing-override" )
message( STATUS "Enabling warning -Winconsistent-missing-override" )
endif()
# Warn on duplicated branches
CHECK_CXX_COMPILER_FLAG( "-Wduplicated-branches" COMPILER_SUPPORTS_WDUPLICATED_BRANCHES )
if( COMPILER_SUPPORTS_WDUPLICATED_BRANCHES )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wduplicated-branches" )
message( STATUS "Enabling warning -Wduplicated-branches" )
endif()
# Warn on duplicated conditions
CHECK_CXX_COMPILER_FLAG( "-Wduplicated-cond" COMPILER_SUPPORTS_WDUPLICATED_COND )
if( COMPILER_SUPPORTS_WDUPLICATED_COND )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wduplicated-cond" )
message( STATUS "Enabling warning -Wduplicated-cond" )
endif()
# Error on variable length arrays (gcc extension)
CHECK_CXX_COMPILER_FLAG( "-Wvla" COMPILER_SUPPORTS_WVLA )
if( COMPILER_SUPPORTS_WVLA )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Werror=vla" )
message( STATUS "Enabling error for -Wvla" )
endif()
# Warn on implicit switch fallthrough
CHECK_CXX_COMPILER_FLAG( "-Wimplicit-fallthrough" COMPILER_SUPPORTS_WIMPLICIT_FALLTHROUGH )
if( COMPILER_SUPPORTS_WIMPLICIT_FALLTHROUGH )
if( CMAKE_COMPILER_IS_GNUCXX )
# GCC level 5 does not allow comments - mirrors the Clang warning
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wimplicit-fallthrough=5" )
else()
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wimplicit-fallthrough" )
endif()
message( STATUS "Enabling warning -Wimplicit-fallthrough" )
endif()
# Error if there is a problem with function returns
CHECK_CXX_COMPILER_FLAG( "-Wreturn-type" COMPILER_SUPPORTS_WRETURN_TYPE )
if( COMPILER_SUPPORTS_WRETURN_TYPE )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Werror=return-type" )
message( STATUS "Enabling error for -Wreturn-type" )
endif()
# Warn about shadowed variables
CHECK_CXX_COMPILER_FLAG( "-Wshadow" COMPILER_SUPPORTS_WSHADOW )
if( COMPILER_SUPPORTS_WSHADOW )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wshadow" )
message( STATUS "Enabling warning -Wshadow" )
endif()
# Add additional warning flags to avoid signed/unsigned comparison
CHECK_CXX_COMPILER_FLAG( "-Wsign-compare" COMPILER_SUPPORTS_WSIGN )
if( COMPILER_SUPPORTS_WSIGN )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wsign-compare" )
message( STATUS "Enabling warning -Wsign-compare" )
endif()
# Warn about missing initializers in construction
CHECK_CXX_COMPILER_FLAG( "-Wmissing-field-initializers" COMPILER_SUPPORTS_WMISSING_INIT )
if( COMPILER_SUPPORTS_WMISSING_INIT )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wmissing-field-initializers" )
message( STATUS "Enabling warning -Wmissing-field-initializers" )
endif()
# Warn about empty if/for/while bodies
CHECK_CXX_COMPILER_FLAG( "-Wempty-body" COMPILER_SUPPORTS_WEMPTY_BODY )
if( COMPILER_SUPPORTS_WEMPTY_BODY )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wempty-body" )
message( STATUS "Enabling warning -Wempty-body" )
endif()
# Warn about out of order intialization
CHECK_CXX_COMPILER_FLAG( "-Wreorder" COMPILER_SUPPORTS_WREORDER )
if( COMPILER_SUPPORTS_WREORDER )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wreorder" )
message( STATUS "Enabling warning -Wreorder" )
endif()
# Warn about mismatched class/struct declarations
CHECK_CXX_COMPILER_FLAG( "-Wmismatched-tags" COMPILER_SUPPORTS_WMISMATCHED_TAGS )
if( COMPILER_SUPPORTS_WMISMATCHED_TAGS )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wmismatched-tags" )
message( STATUS "Enabling warning -Wmismatched-tags" )
endif()
# See if the compiler will throw warnings on these conversions
CHECK_CXX_COMPILER_FLAG( "-Wimplicit-int-float-conversion" COMPILER_SUPPORTS_WIMPLICIT_FLOAT_CONVERSION )
if( COMPILER_SUPPORTS_WIMPLICIT_FLOAT_CONVERSION )
# This one is different, it is used to guard warning removal for this inside the code
set( HAVE_WIMPLICIT_FLOAT_CONVERSION true )
endif()
# Avoid ABI warnings, specifically one about an ABI change on ppc64el from gcc5 to gcc 6.
CHECK_CXX_COMPILER_FLAG( "-Wpsabi" COMPILER_SUPPORTS_WPSABI )
if( COMPILER_SUPPORTS_WPSABI )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} -Wno-psabi" )
message( STATUS "Disabling warning -Wpsabi" )
endif()
# Append any additional warning flags so the end of the warning string
if( KICAD_ADDITIONAL_WARN_FLAGS )
set( WARN_FLAGS_CXX "${WARN_FLAGS_CXX} ${KICAD_ADDITIONAL_WARN_FLAGS}" )
message( STATUS "Adding additional warning flags: ${KICAD_ADDITIONAL_WARN_FLAGS}")
endif()
endif()
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