131 lines
5.6 KiB
Plaintext
131 lines
5.6 KiB
Plaintext
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_sanitizers.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_SANITIZERS([SANITIZERS], [ENABLED-BY-DEFAULT], [ACTION-SUCCESS])
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#
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# DESCRIPTION
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#
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# Offers users to enable one or more sanitizers (see
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# https://github.com/google/sanitizers) with the corresponding
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# --enable-<sanitizer>-sanitizer option.
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#
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# SANITIZERS is a whitespace-separated list of sanitizers to offer via
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# --enable-<sanitizer>-sanitizer options, e.g. "address memory" for the
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# address sanitizer and the memory sanitizer. If SANITIZERS is not specified,
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# all known sanitizers to AX_SANITIZERS will be offered, which at the time of
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# writing are "address memory undefined".
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# NOTE that SANITIZERS is expanded at autoconf time, not at configure time,
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# i.e. you cannot use shell variables in SANITIZERS.
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#
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# ENABLED-BY-DEFAULT is a whitespace-separated list of sanitizers which
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# should be enabled by default, e.g. "memory undefined". Note that not all
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# sanitizers can be combined, e.g. memory sanitizer cannot be enabled when
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# address sanitizer is already enabled.
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# Set ENABLED-BY-DEFAULT to a single whitespace in order to disable all
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# sanitizers by default.
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# ENABLED-BY-DEFAULT is expanded at configure time, so you can use shell
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# variables.
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#
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# ACTION-SUCCESS allows to specify shell commands to execute on success, i.e.
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# when one of the sanitizers was successfully enabled. This is a good place
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# to call AC_DEFINE for any precompiler constants you might need to make your
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# code play nice with sanitizers.
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#
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# The variable ax_enabled_sanitizers contains a whitespace-separated list of
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# all enabled sanitizers, so that you can print them at the end of configure,
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# if you wish.
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#
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# The additional --enable-sanitizers option allows users to enable/disable
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# all sanitizers, effectively overriding ENABLED-BY-DEFAULT.
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#
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# EXAMPLES
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#
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# AX_SANITIZERS([address])
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# dnl offer users to enable address sanitizer via --enable-address-sanitizer
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#
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# is_debug_build=…
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# if test "x$is_debug_build" = "xyes"; then
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# default_sanitizers="address memory"
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# else
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# default_sanitizers=
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# fi
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# AX_SANITIZERS([address memory], [$default_sanitizers])
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# dnl enable address sanitizer and memory sanitizer by default for debug
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# dnl builds, e.g. when building from git instead of a dist tarball.
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#
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# AX_SANITIZERS(, , [
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# AC_DEFINE([SANITIZERS_ENABLED],
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# [],
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# [At least one sanitizer was enabled])])
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# dnl enable all sanitizers known to AX_SANITIZERS by default and set the
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# dnl SANITIZERS_ENABLED precompiler constant.
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#
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# AX_SANITIZERS(, [ ])
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# dnl provide all sanitizers, but enable none by default.
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#
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# LICENSE
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#
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# Copyright (c) 2016 Michael Stapelberg <michael@i3wm.org>
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#
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# Copying and distribution of this file, with or without modification,
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# are permitted in any medium without royalty provided the copyright
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# notice and this notice are preserved. This file is offered as-is,
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# without any warranty.
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AC_DEFUN([AX_SANITIZERS],
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[AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
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AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
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AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
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AC_ARG_ENABLE(sanitizers,
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AS_HELP_STRING(
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[--enable-sanitizers],
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[enable all known sanitizers]),
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[ax_sanitizers_default=$enableval],
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[ax_sanitizers_default=])
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ax_enabled_sanitizers=
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m4_foreach_w([mysan], m4_default($1, [address memory undefined]), [
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dnl If ax_sanitizers_default is unset, i.e. the user neither explicitly
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dnl enabled nor explicitly disabled all sanitizers, we get the default value
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dnl for this sanitizer based on whether it is listed in ENABLED-BY-DEFAULT.
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AS_IF([test "x$ax_sanitizers_default" = "x"], [dnl
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ax_sanitizer_default=
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for mycheck in m4_default([$2], [address memory undefined]); do
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AS_IF([test "x$mycheck" = "x[]mysan"], [ax_sanitizer_default=yes])
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done
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AS_IF([test "x$ax_sanitizer_default" = "x"], [ax_sanitizer_default=no])
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],
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[ax_sanitizer_default=$ax_sanitizers_default])
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AC_ARG_ENABLE(mysan[]-sanitizer,
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AS_HELP_STRING(
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[--enable-[]mysan[]-sanitizer],
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[enable -fsanitize=mysan]),
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[ax_sanitizer_enabled=$enableval],
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[ax_sanitizer_enabled=$ax_sanitizer_default])
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AS_IF([test "x$ax_sanitizer_enabled" = "xyes"], [
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dnl Not using AX_APPEND_COMPILE_FLAGS and AX_APPEND_LINK_FLAGS because they
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dnl lack the ability to specify ACTION-SUCCESS.
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AX_CHECK_COMPILE_FLAG([-fsanitize=[]mysan], [
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AX_CHECK_LINK_FLAG([-fsanitize=[]mysan], [
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AX_APPEND_FLAG([-fsanitize=[]mysan], [])
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dnl If and only if libtool is being used, LDFLAGS needs to contain -Wc,-fsanitize=….
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dnl See e.g. https://sources.debian.net/src/systemd/231-7/configure.ac/?hl=128#L135
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dnl TODO: how can recognize that situation and add -Wc,?
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AX_APPEND_FLAG([-fsanitize=[]mysan], [LDFLAGS])
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dnl TODO: add -fPIE -pie for memory
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# -fno-omit-frame-pointer results in nicer stack traces in error
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# messages, see http://clang.llvm.org/docs/AddressSanitizer.html#usage
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AX_CHECK_COMPILE_FLAG([-fno-omit-frame-pointer], [
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AX_APPEND_FLAG([-fno-omit-frame-pointer], [])])
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dnl TODO: at least for clang, we should specify exactly -O1, not -O2 or -O0, so that performance is reasonable but stacktraces are not tampered with (due to inlining), see http://clang.llvm.org/docs/AddressSanitizer.html#usage
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m4_default([$3], :)
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ax_enabled_sanitizers="[]mysan $ax_enabled_sanitizers"
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])
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])
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])
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])dnl
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])dnl AX_SANITIZERS
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