+++ /dev/null
-# ===========================================================================
-# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-# AX_COMPILER_FLAGS([CFLAGS-VARIABLE], [LDFLAGS-VARIABLE], [IS-RELEASE], [EXTRA-BASE-CFLAGS], [EXTRA-YES-CFLAGS], [UNUSED], [UNUSED], [UNUSED], [EXTRA-BASE-LDFLAGS], [EXTRA-YES-LDFLAGS], [UNUSED], [UNUSED], [UNUSED])
-#
-# DESCRIPTION
-#
-# Check for the presence of an --enable-compile-warnings option to
-# configure, defaulting to "error" in normal operation, or "yes" if
-# IS-RELEASE is equal to "yes". Return the value in the variable
-# $ax_enable_compile_warnings.
-#
-# Depending on the value of --enable-compile-warnings, different compiler
-# warnings are checked to see if they work with the current compiler and,
-# if so, are appended to CFLAGS-VARIABLE and LDFLAGS-VARIABLE. This
-# allows a consistent set of baseline compiler warnings to be used across
-# a code base, irrespective of any warnings enabled locally by individual
-# developers. By standardising the warnings used by all developers of a
-# project, the project can commit to a zero-warnings policy, using -Werror
-# to prevent compilation if new warnings are introduced. This makes
-# catching bugs which are flagged by warnings a lot easier.
-#
-# By providing a consistent --enable-compile-warnings argument across all
-# projects using this macro, continuous integration systems can easily be
-# configured the same for all projects. Automated systems or build
-# systems aimed at beginners may want to pass the --disable-Werror
-# argument to unconditionally prevent warnings being fatal.
-#
-# --enable-compile-warnings can take the values:
-#
-# * no: Base compiler warnings only; not even -Wall.
-# * yes: The above, plus a broad range of useful warnings.
-# * error: The above, plus -Werror so that all warnings are fatal.
-# Use --disable-Werror to override this and disable fatal
-# warnings.
-#
-# The set of base and enabled flags can be augmented using the
-# EXTRA-*-CFLAGS and EXTRA-*-LDFLAGS variables, which are tested and
-# appended to the output variable if --enable-compile-warnings is not
-# "no". Flags should not be disabled using these arguments, as the entire
-# point of AX_COMPILER_FLAGS is to enforce a consistent set of useful
-# compiler warnings on code, using warnings which have been chosen for low
-# false positive rates. If a compiler emits false positives for a
-# warning, a #pragma should be used in the code to disable the warning
-# locally. See:
-#
-# https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Diagnostic-Pragmas.html#Diagnostic-Pragmas
-#
-# The EXTRA-* variables should only be used to supply extra warning flags,
-# and not general purpose compiler flags, as they are controlled by
-# configure options such as --disable-Werror.
-#
-# IS-RELEASE can be used to disable -Werror when making a release, which
-# is useful for those hairy moments when you just want to get the release
-# done as quickly as possible. Set it to "yes" to disable -Werror. By
-# default, it uses the value of $ax_is_release, so if you are using the
-# AX_IS_RELEASE macro, there is no need to pass this parameter. For
-# example:
-#
-# AX_IS_RELEASE([git-directory])
-# AX_COMPILER_FLAGS()
-#
-# CFLAGS-VARIABLE defaults to WARN_CFLAGS, and LDFLAGS-VARIABLE defaults
-# to WARN_LDFLAGS. Both variables are AC_SUBST-ed by this macro, but must
-# be manually added to the CFLAGS and LDFLAGS variables for each target in
-# the code base.
-#
-# If C++ language support is enabled with AC_PROG_CXX, which must occur
-# before this macro in configure.ac, warning flags for the C++ compiler
-# are AC_SUBST-ed as WARN_CXXFLAGS, and must be manually added to the
-# CXXFLAGS variables for each target in the code base. EXTRA-*-CFLAGS can
-# be used to augment the base and enabled flags.
-#
-# Warning flags for g-ir-scanner (from GObject Introspection) are
-# AC_SUBST-ed as WARN_SCANNERFLAGS. This variable must be manually added
-# to the SCANNERFLAGS variable for each GIR target in the code base. If
-# extra g-ir-scanner flags need to be enabled, the AX_COMPILER_FLAGS_GIR
-# macro must be invoked manually.
-#
-# AX_COMPILER_FLAGS may add support for other tools in future, in addition
-# to the compiler and linker. No extra EXTRA-* variables will be added
-# for those tools, and all extra support will still use the single
-# --enable-compile-warnings configure option. For finer grained control
-# over the flags for individual tools, use AX_COMPILER_FLAGS_CFLAGS,
-# AX_COMPILER_FLAGS_LDFLAGS and AX_COMPILER_FLAGS_* for new tools.
-#
-# The UNUSED variables date from a previous version of this macro, and are
-# automatically appended to the preceding non-UNUSED variable. They should
-# be left empty in new uses of the macro.
-#
-# LICENSE
-#
-# Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
-# Copyright (c) 2015 David King <amigadave@amigadave.com>
-#
-# 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 14
-
-# _AX_COMPILER_FLAGS_LANG([LANGNAME])
-m4_defun([_AX_COMPILER_FLAGS_LANG],
-[m4_ifdef([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [],
- [m4_define([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [])dnl
- AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_]$1[FLAGS])])dnl
-])
-
-AC_DEFUN([AX_COMPILER_FLAGS],[
- # C support is enabled by default.
- _AX_COMPILER_FLAGS_LANG([C])
- # Only enable C++ support if AC_PROG_CXX is called. The redefinition of
- # AC_PROG_CXX is so that a fatal error is emitted if this macro is called
- # before AC_PROG_CXX, which would otherwise cause no C++ warnings to be
- # checked.
- AC_PROVIDE_IFELSE([AC_PROG_CXX],
- [_AX_COMPILER_FLAGS_LANG([CXX])],
- [m4_define([AC_PROG_CXX], defn([AC_PROG_CXX])[_AX_COMPILER_FLAGS_LANG([CXX])])])
- AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_LDFLAGS])
-
- # Default value for IS-RELEASE is $ax_is_release
- ax_compiler_flags_is_release=m4_tolower(m4_normalize(ifelse([$3],,
- [$ax_is_release],
- [$3])))
-
- AC_ARG_ENABLE([compile-warnings],
- AS_HELP_STRING([--enable-compile-warnings=@<:@no/yes/error@:>@],
- [Enable compiler warnings and errors]),,
- [AS_IF([test "$ax_compiler_flags_is_release" = "yes"],
- [enable_compile_warnings="yes"],
- [enable_compile_warnings="error"])])
- AC_ARG_ENABLE([Werror],
- AS_HELP_STRING([--disable-Werror],
- [Unconditionally make all compiler warnings non-fatal]),,
- [enable_Werror=maybe])
-
- # Return the user's chosen warning level
- AS_IF([test "$enable_Werror" = "no" -a \
- "$enable_compile_warnings" = "error"],[
- enable_compile_warnings="yes"
- ])
-
- ax_enable_compile_warnings=$enable_compile_warnings
-
- AX_COMPILER_FLAGS_CFLAGS([$1],[$ax_compiler_flags_is_release],
- [$4],[$5 $6 $7 $8])
- m4_ifdef([_AX_COMPILER_FLAGS_LANG_CXX_enabled],
- [AX_COMPILER_FLAGS_CXXFLAGS([WARN_CXXFLAGS],
- [$ax_compiler_flags_is_release],
- [$4],[$5 $6 $7 $8])])
- AX_COMPILER_FLAGS_LDFLAGS([$2],[$ax_compiler_flags_is_release],
- [$9],[$10 $11 $12 $13])
- AX_COMPILER_FLAGS_GIR([WARN_SCANNERFLAGS],[$ax_compiler_flags_is_release])
-])dnl AX_COMPILER_FLAGS
projects / babeltrace.git / blobdiff