+++ /dev/null
-# =============================================================================
-# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cflags.html
-# =============================================================================
-#
-# SYNOPSIS
-#
-# AX_COMPILER_FLAGS_CFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
-#
-# DESCRIPTION
-#
-# Add warning flags for the C compiler to VARIABLE, which defaults to
-# WARN_CFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
-# manually added to the CFLAGS variable for each target in the code base.
-#
-# This macro depends on the environment set up by AX_COMPILER_FLAGS.
-# Specifically, it uses the value of $ax_enable_compile_warnings to decide
-# which flags to enable.
-#
-# LICENSE
-#
-# Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
-# Copyright (c) 2017, 2018 Reini Urban <rurban@cpan.org>
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice
-# and this notice are preserved. This file is offered as-is, without any
-# warranty.
-
-#serial 17
-
-AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[
- AC_REQUIRE([AC_PROG_SED])
- AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
- AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
- AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
-
- # Variable names
- m4_define([ax_warn_cflags_variable],
- [m4_normalize(ifelse([$1],,[WARN_CFLAGS],[$1]))])
-
- AC_LANG_PUSH([C])
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
- [#ifndef __cplusplus
- #error "no C++"
- #endif]])],
- [ax_compiler_cxx=yes;],
- [ax_compiler_cxx=no;])
-
- # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
- # flags, otherwise they are always appended to the warn_cflags variable, and
- # Clang warns on them for every compilation unit.
- # If this is passed to GCC, it will explode, so the flag must be enabled
- # conditionally.
- AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
- ax_compiler_flags_test="-Werror=unknown-warning-option"
- ],[
- ax_compiler_flags_test=""
- ])
-
- # Check that -Wno-suggest-attribute=format is supported
- AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
- ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
- ],[
- ax_compiler_no_suggest_attribute_flags=""
- ])
-
- # Base flags
- AX_APPEND_COMPILE_FLAGS([ dnl
- -fno-strict-aliasing dnl
- $3 dnl
- ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
-
- AS_IF([test "$ax_enable_compile_warnings" != "no"],[
- if test "$ax_compiler_cxx" = "no" ; then
- # C-only flags. Warn in C++
- AX_APPEND_COMPILE_FLAGS([ dnl
- -Wnested-externs dnl
- -Wmissing-prototypes dnl
- -Wstrict-prototypes dnl
- -Wdeclaration-after-statement dnl
- -Wimplicit-function-declaration dnl
- -Wold-style-definition dnl
- -Wjump-misses-init dnl
- ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
- fi
-
- # "yes" flags
- AX_APPEND_COMPILE_FLAGS([ dnl
- -Wall dnl
- -Wextra dnl
- -Wundef dnl
- -Wwrite-strings dnl
- -Wpointer-arith dnl
- -Wmissing-declarations dnl
- -Wredundant-decls dnl
- -Wno-unused-parameter dnl
- -Wno-missing-field-initializers dnl
- -Wformat=2 dnl
- -Wcast-align dnl
- -Wformat-nonliteral dnl
- -Wformat-security dnl
- -Wsign-compare dnl
- -Wstrict-aliasing dnl
- -Wshadow dnl
- -Winline dnl
- -Wpacked dnl
- -Wmissing-format-attribute dnl
- -Wmissing-noreturn dnl
- -Winit-self dnl
- -Wredundant-decls dnl
- -Wmissing-include-dirs dnl
- -Wunused-but-set-variable dnl
- -Warray-bounds dnl
- -Wreturn-type dnl
- -Wswitch-enum dnl
- -Wswitch-default dnl
- -Wduplicated-cond dnl
- -Wduplicated-branches dnl
- -Wlogical-op dnl
- -Wrestrict dnl
- -Wnull-dereference dnl
- -Wdouble-promotion dnl
- $4 dnl
- $5 dnl
- $6 dnl
- $7 dnl
- ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
- ])
- AS_IF([test "$ax_enable_compile_warnings" = "error"],[
- # "error" flags; -Werror has to be appended unconditionally because
- # it's not possible to test for
- #
- # suggest-attribute=format is disabled because it gives too many false
- # positives
- AX_APPEND_FLAG([-Werror],ax_warn_cflags_variable)
-
- AX_APPEND_COMPILE_FLAGS([ dnl
- [$ax_compiler_no_suggest_attribute_flags] dnl
- ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
- ])
-
- # In the flags below, when disabling specific flags, always add *both*
- # -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
- # we enable -Werror, disable a flag, and a build bot passes CFLAGS=-Wall,
- # which effectively turns that flag back on again as an error.
- for flag in $ax_warn_cflags_variable; do
- AS_CASE([$flag],
- [-Wno-*=*],[],
- [-Wno-*],[
- AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
- ax_warn_cflags_variable,
- [$ax_compiler_flags_test])
- ])
- done
-
- AC_LANG_POP([C])
-
- # Substitute the variables
- AC_SUBST(ax_warn_cflags_variable)
-])dnl AX_COMPILER_FLAGS
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