gecko-dev/build/moz.configure/warnings.configure

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# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
js_option('--enable-warnings-as-errors', env='MOZ_ENABLE_WARNINGS_AS_ERRORS',
default=depends('MOZ_AUTOMATION')(lambda x: bool(x)),
help='{Enable|Disable} treating warnings as errors')
@depends('--enable-warnings-as-errors')
def rust_warning_flags(warnings_as_errors):
flags = []
# Note that cargo passes --cap-lints warn to rustc for third-party code, so
# we don't need a very complicated setup.
if warnings_as_errors:
flags.append('-Dwarnings')
else:
flags.extend(('--cap-lints', 'warn'))
return flags
c_warning_flag = dependable('-Werror')
@depends('--enable-warnings-as-errors', c_warning_flag)
def warnings_as_errors(warnings_as_errors, c_warning_flag):
if not warnings_as_errors:
return ''
return c_warning_flag
set_config('WARNINGS_AS_ERRORS', warnings_as_errors)
# We have a peculiar setup in old-configure.in where some compilation tests
# depend on enabling warnings-as-errors even if it's disabled for Firefox
# compilation. We therefore need this assignment.
add_old_configure_assignment('WARNINGS_AS_ERRORS', c_warning_flag)
# GCC/Clang warnings:
# https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
# https://clang.llvm.org/docs/DiagnosticsReference.html
# lots of useful warnings
add_gcc_warning('-Wall')
# catch implicit truncation of enum values assigned to smaller bit fields
check_and_add_gcc_warning('-Wbitfield-enum-conversion')
# catches bugs, e.g. "if (c); foo();", few false positives
add_gcc_warning('-Wempty-body')
# catches return types with qualifiers like const
add_gcc_warning('-Wignored-qualifiers')
# function declaration hides virtual function from base class
add_gcc_warning('-Woverloaded-virtual', cxx_compiler)
# catches pointer arithmetic using NULL or sizeof(void)
add_gcc_warning('-Wpointer-arith')
# catch modifying constructor parameter that shadows member variable
check_and_add_gcc_warning('-Wshadow-field-in-constructor-modified')
# catches comparing signed/unsigned ints
add_gcc_warning('-Wsign-compare')
# catches overflow bugs, few false positives
add_gcc_warning('-Wtype-limits')
# catches some dead code
add_gcc_warning('-Wunreachable-code')
check_and_add_gcc_warning('-Wunreachable-code-return')
# catches treating string literals as non-const
add_gcc_warning('-Wwrite-strings', cxx_compiler)
# turned on by -Wall, but we use offsetof on non-POD types frequently
add_gcc_warning('-Wno-invalid-offsetof', cxx_compiler)
# catches objects passed by value to variadic functions.
check_and_add_gcc_warning('-Wclass-varargs')
# catches empty if/switch/for initialization statements that have no effect
check_and_add_gcc_warning('-Wempty-init-stmt', cxx_compiler)
# catches some implicit conversion of floats to ints
check_and_add_gcc_warning('-Wfloat-overflow-conversion')
check_and_add_gcc_warning('-Wfloat-zero-conversion')
# catches issues around loops
check_and_add_gcc_warning('-Wloop-analysis')
# catches C++ version forward-compat issues
check_and_add_gcc_warning('-Wc++2a-compat', cxx_compiler)
# catches possible misuse of the comma operator
check_and_add_gcc_warning('-Wcomma', cxx_compiler)
# catches duplicated conditions in if-else-if chains
check_and_add_gcc_warning('-Wduplicated-cond')
# catches unintentional switch case fallthroughs
check_and_add_gcc_warning('-Wimplicit-fallthrough', cxx_compiler)
# catches expressions used as a null pointer constant
# XXX: at the time of writing, the version of clang used on the OS X test
# machines has a bug that causes it to reject some valid files if both
# -Wnon-literal-null-conversion and -Wsometimes-uninitialized are
# specified. We work around this by instead using
# -Werror=non-literal-null-conversion, but we only do that when
# --enable-warnings-as-errors is specified so that no unexpected fatal
# warnings are produced.
check_and_add_gcc_warning('-Werror=non-literal-null-conversion',
when='--enable-warnings-as-errors')
# catches string literals used in boolean expressions
check_and_add_gcc_warning('-Wstring-conversion')
# catches comparisons that are always true or false
check_and_add_gcc_warning('-Wtautological-overlap-compare')
check_and_add_gcc_warning('-Wtautological-unsigned-enum-zero-compare')
check_and_add_gcc_warning('-Wtautological-unsigned-zero-compare')
# This can be triggered by certain patterns used deliberately in portable code
check_and_add_gcc_warning('-Wno-error=tautological-type-limit-compare')
# we inline 'new' and 'delete' in mozalloc
check_and_add_gcc_warning('-Wno-inline-new-delete', cxx_compiler)
# Prevent the following GCC warnings from being treated as errors:
# too many false positives
check_and_add_gcc_warning('-Wno-error=maybe-uninitialized')
# we don't want our builds held hostage when a platform-specific API
# becomes deprecated.
check_and_add_gcc_warning('-Wno-error=deprecated-declarations')
# false positives depending on optimization
check_and_add_gcc_warning('-Wno-error=array-bounds')
# can't get rid of those PGO warnings
check_and_add_gcc_warning('-Wno-error=coverage-mismatch')
# -Wbackend-plugin warnings from Android PGO profile-use builds:
# error: /builds/worker/workspace/build/src/mozglue/misc/AutoProfilerLabel.cpp:
# Function control flow change detected (hash mismatch)
# _ZN7mozilla17AutoProfilerLabelD2Ev [-Werror,-Wbackend-plugin]
check_and_add_gcc_warning('-Wno-error=backend-plugin')
# false positives depending on optimizations
check_and_add_gcc_warning('-Wno-error=free-nonheap-object')
# Would be a pain to fix all occurrences, for very little gain
check_and_add_gcc_warning('-Wno-error=multistatement-macros')
# Disable the -Werror for return-std-move because of a false positive
# on nsTAutoStringN: https://bugs.llvm.org/show_bug.cgi?id=37249
check_and_add_gcc_warning('-Wno-error=return-std-move')
# Disable the -Werror for -Wclass-memaccess as we have a long
# tail of issues to fix
check_and_add_gcc_warning('-Wno-error=class-memaccess')
# -Watomic-alignment is a new warning in clang 7 that seems way too broad.
# https://bugs.llvm.org/show_bug.cgi?id=38593
check_and_add_gcc_warning('-Wno-error=atomic-alignment')
# New warning with gcc 9. Not useful
# https://bugzilla.mozilla.org/show_bug.cgi?id=1515356
check_and_add_gcc_warning('-Wno-error=deprecated-copy')
# catches format/argument mismatches with printf
c_format_warning, cxx_format_warning = check_and_add_gcc_warning(
'-Wformat', when=depends(target)(lambda t: t.kernel != 'WINNT'))
# Add compile-time warnings for unprotected functions and format functions
# that represent possible security problems. Enable this only when -Wformat
# is enabled, otherwise it is an error
check_and_add_gcc_warning('-Wformat-security',
when=c_format_warning & cxx_format_warning)
check_and_add_gcc_warning('-Wformat-overflow=2',
when=c_format_warning & cxx_format_warning)
# Other MinGW specific things
with only_when(depends(target)(lambda t: t.kernel == 'WINNT')):
# When compiling for Windows with gcc, we encounter lots of "#pragma warning"'s
# which is an MSVC-only pragma that GCC does not recognize.
check_and_add_gcc_warning('-Wno-unknown-pragmas')
# When compiling for Windows with gcc, gcc throws false positives and true
# positives where the callsite is ifdef-ed out
check_and_add_gcc_warning('-Wno-unused-function')
# When compiling for Windows with gcc, gcc cannot produce this warning
# correctly: it mistakes DWORD_PTR and ULONG_PTR as types you cannot
# give NULL to. (You can in fact do that.)
check_and_add_gcc_warning('-Wno-conversion-null')
# Throughout the codebase we regularly have switch statements off of enums
# without covering every value in the enum. We don't care about these warnings.
check_and_add_gcc_warning('-Wno-switch')
# Another code pattern we have is using start and end constants in enums of
# different types. We do this for safety, but then when comparing it throws
# an error, which we would like to ignore. This seems to only affect the MinGW
# build, but we're not sure why.
check_and_add_gcc_warning('-Wno-enum-compare')
# We hit this all over the place with the gtest INSTANTIATE_TEST_CASE_P macro
check_and_add_gcc_warning('-Wno-gnu-zero-variadic-macro-arguments')
# Disable a warning with gcc 7. See bug 1320656
# We are far from using C++17 and the impact of the warning will be
# limited to a potential public ABI.
# Currently only affecting js/
check_and_add_gcc_warning('-Wno-noexcept-type', cxx_compiler,
when=depends(build_project)
(lambda build_project: build_project == 'js'))
# Please keep these last in this file
add_old_configure_assignment('_WARNINGS_CFLAGS', warnings_flags.cflags)
add_old_configure_assignment('_WARNINGS_CXXFLAGS', warnings_flags.cxxflags)
add_old_configure_assignment(
'_WARNINGS_HOST_CFLAGS', warnings_flags.host_cflags)
add_old_configure_assignment(
'_WARNINGS_HOST_CXXFLAGS', warnings_flags.host_cxxflags)