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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') and not is_variable('all_c_warnings')
+  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']
+  endif
+
+  all_c_warnings = cc.get_supported_arguments(all_c_warnings)
+  add_global_arguments(all_c_warnings, language: ['c'])
+endif
+
+#######
+# C++ #
+#######
+
+if is_variable('cpp')
+  all_cpp_warnings = []
+
+  if cpp.get_id() == 'clang'
+    all_cpp_warnings += [
+      '-Weverything',
+      '-Wno-c++98-compat',
+      '-Wno-c++98-compat-pedantic'
+    ]
+
+    if not meson.is_cross_build()
+      all_cpp_warnings += [
+        '-Wno-poison-system-directories',
+      ]
+    endif
+
+  elif cpp.get_id() == 'gcc'
+    all_cpp_warnings += gcc_common_warnings + [
+      '-Wabi-tag',
+      '-Waligned-new=all',
+      '-Wcatch-value=3',
+      '-Wcomma-subscript',
+      '-Wconditionally-supported',
+      '-Wctor-dtor-privacy',
+      '-Wdelete-non-virtual-dtor',
+      '-Wdeprecated',
+      '-Wdeprecated-copy',
+      '-Wdeprecated-copy-dtor',
+      '-Wdeprecated-enum-enum-conversion',
+      '-Wdeprecated-enum-float-conversion',
+      '-Weffc++',
+      '-Wexpansion-to-defined',
+      '-Wextra-semi',
+      '-Wimport',
+      '-Winvalid-imported-macros',
+      '-Wmismatched-tags',
+      '-Wmultiple-inheritance',
+      '-Wnoexcept',
+      '-Wnoexcept-type',
+      '-Wnon-virtual-dtor',
+      '-Wold-style-cast',
+      '-Woverloaded-virtual',
+      '-Wplacement-new=2',
+      '-Wredundant-move',
+      '-Wredundant-tags',
+      '-Wregister',
+      '-Wsign-compare',
+      '-Wsign-promo',
+      '-Wsized-deallocation',
+      '-Wstrict-null-sentinel',
+      '-Wsuggest-final-methods',
+      '-Wsuggest-final-types',
+      '-Wsuggest-override',
+      '-Wuseless-cast',
+      '-Wvirtual-inheritance',
+      '-Wvolatile',
+      '-Wzero-as-null-pointer-constant',
+    ]
+
+  elif cpp.get_id() == 'msvc'
+    all_cpp_warnings += ['/Wall']
+  endif
+
+  all_cpp_warnings = cpp.get_supported_arguments(all_cpp_warnings)
+  add_global_arguments(all_cpp_warnings, language: ['cpp'])
+endif