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# Copyright 2020-2022 David Robillard <d@drobilla.net>
# SPDX-License-Identifier: CC0-1.0 OR ISC
# General code to enable approximately all warnings in GCC 12, clang, and MSVC.
#
# This is trivial for clang and MSVC, but GCC doesn't have an "everything"
# option, so we need to enable everything we want explicitly. Wall is assumed,
# but Wextra is not, for stability.
#
# These are collected from common.opt and c.opt in the GCC source, and manually
# curated with the help of the GCC documentation. Warnings that are
# application-specific, historical, or about compatibility between specific
# language revisions are omitted. The intent here is to have roughly the same
# meaning as clang's Weverything: extremely strict, but general. Specifically
# omitted are:
#
# General:
#
# Wabi=
# Waggregate-return
# Walloc-size-larger-than=BYTES
# Walloca-larger-than=BYTES
# Wframe-larger-than=BYTES
# Wlarger-than=BYTES
# Wstack-usage=BYTES
# Wsystem-headers
# Wtraditional
# Wtraditional-conversion
# Wtrampolines
# Wvla-larger-than=BYTES
#
# Build specific:
#
# Wpoison-system-directories
#
# C Specific:
#
# Wc11-c2x-compat
# Wc90-c99-compat
# Wc99-c11-compat
# Wdeclaration-after-statement
# Wtraditional
# Wtraditional-conversion
#
# C++ Specific:
#
# Wc++0x-compat
# Wc++1z-compat
# Wc++2a-compat
# Wctad-maybe-unsupported
# Wnamespaces
# Wtemplates
# GCC warnings that apply to all C-family languages
gcc_common_warnings = [
'-Walloc-zero',
'-Walloca',
'-Wanalyzer-too-complex',
'-Warith-conversion',
'-Warray-bounds=2',
'-Wattribute-alias=2',
'-Wbidi-chars=ucn',
'-Wcast-align=strict',
'-Wcast-function-type',
'-Wcast-qual',
'-Wclobbered',
'-Wconversion',
'-Wdate-time',
'-Wdisabled-optimization',
'-Wdouble-promotion',
'-Wduplicated-branches',
'-Wduplicated-cond',
'-Wempty-body',
'-Wendif-labels',
'-Wfloat-equal',
'-Wformat-overflow=2',
'-Wformat-signedness',
'-Wformat-truncation=2',
'-Wformat=2',
'-Wignored-qualifiers',
'-Wimplicit-fallthrough=3',
'-Winit-self',
'-Winline',
'-Winvalid-pch',
'-Wlogical-op',
'-Wmissing-declarations',
'-Wmissing-field-initializers',
'-Wmissing-include-dirs',
'-Wmultichar',
'-Wnormalized=nfc',
'-Wnull-dereference',
'-Wopenacc-parallelism',
'-Woverlength-strings',
'-Wpacked',
'-Wpacked-bitfield-compat',
'-Wpadded',
'-Wpointer-arith',
'-Wredundant-decls',
'-Wshadow',
'-Wshift-negative-value',
'-Wshift-overflow=2',
'-Wstack-protector',
'-Wstrict-aliasing=3',
'-Wstrict-overflow=5',
'-Wstring-compare',
'-Wstringop-overflow=3',
'-Wsuggest-attribute=cold',
'-Wsuggest-attribute=const',
'-Wsuggest-attribute=format',
'-Wsuggest-attribute=malloc',
'-Wsuggest-attribute=noreturn',
'-Wsuggest-attribute=pure',
'-Wswitch-default',
'-Wswitch-enum',
'-Wtrampolines',
'-Wtrivial-auto-var-init',
'-Wtype-limits',
'-Wundef',
'-Wuninitialized',
'-Wunsafe-loop-optimizations',
'-Wunused',
'-Wunused-const-variable=2',
'-Wunused-macros',
'-Wvector-operation-performance',
'-Wvla',
'-Wwrite-strings',
]
#####
# C #
#####
if is_variable('cc')
# Set all_c_warnings for the current C compiler
all_c_warnings = []
if cc.get_id() == 'clang'
all_c_warnings += ['-Weverything']
if not meson.is_cross_build()
all_c_warnings += [
'-Wno-poison-system-directories',
]
endif
elif cc.get_id() == 'gcc'
all_c_warnings += gcc_common_warnings + [
'-Wabsolute-value',
'-Wbad-function-cast',
'-Wc++-compat',
'-Wenum-conversion',
'-Wjump-misses-init',
'-Wmissing-parameter-type',
'-Wmissing-prototypes',
'-Wnested-externs',
'-Wold-style-declaration',
'-Wold-style-definition',
'-Woverride-init',
'-Wsign-compare',
'-Wstrict-prototypes',
'-Wunsuffixed-float-constants',
]
elif cc.get_id() == 'msvc'
all_c_warnings += [
'/Wall',
'/experimental:external',
'/external:W0',
'/external:anglebrackets',
]
endif
all_c_warnings = cc.get_supported_arguments(all_c_warnings)
add_global_arguments(all_c_warnings, language: ['c'])
endif
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