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# Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# Processes --with-sanitizer, --with-fuzzer, and --with-oss-fuzz flags, checks
# if the options are supported by the compiler, and sets the following
# variables accordingly:
#
# - sanitizer_CFLAGS -fsanitize=...
# - fuzzer_CLAGS -fsanitize=...
# - fuzzer_LDLAGS -fsanitize=...
#
AC_DEFUN([AX_SANITIZER], [
# Configure options
AC_ARG_WITH([sanitizer],
[AS_HELP_STRING([--with-sanitizer], [Compile with sanitizer [default=no]])],
[],
[with_sanitizer=no]
)
AC_ARG_WITH([fuzzer],
[AS_HELP_STRING([--with-fuzzer], [Compile with libfuzzer [default=no]])],
[],
[with_fuzzer=no]
)
AC_ARG_WITH([oss-fuzz],
[AS_HELP_STRING([--with-oss-fuzz], [Link for oss-fuzz environment [default=no]])],
[],
[with_oss_fuzz=no]
)
# Using -fsanitize=fuzzer requires clang >= 6.0
AS_IF([test "$with_fuzzer" != "no"],[
# Get clang version if empty
AS_IF([test -z "$CC_CLANG_VERSION"],[AX_CC_CLANG])
AX_COMPARE_VERSION([$CC_CLANG_VERSION],ge,[6.0],[],[
AC_MSG_ERROR([clang >= 6.0 required for fuzzer])])])
# Default values
AS_IF([test "$with_sanitizer" = "yes"], [ with_sanitizer=address ])
AS_IF([test "$with_fuzzer" = "yes"], [ with_fuzzer=fuzzer ])
# Construct output variables
sanitizer_CFLAGS=
fuzzer_CFLAGS=
fuzzer_LDFLAGS=
AS_IF([test "$with_sanitizer" != "no"], [
sanitizer_CFLAGS="-fsanitize=${with_sanitizer}"
])
AS_IF([test "$with_fuzzer" != "no"], [
fuzzer_CFLAGS="-fsanitize=${with_fuzzer}"
fuzzer_LDFLAGS="-fsanitize=${with_fuzzer}"
])
AC_SUBST(fuzzer_CFLAGS)
AC_SUBST(fuzzer_LDFLAGS)
# Test compiler support
AS_IF([test -n "$sanitizer_CFLAGS" -o -n "$fuzzer_CFLAGS"], [
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $sanitizer_CFLAGS $fuzzer_CFLAGS"
AC_MSG_CHECKING([whether compiler accepts '${sanitizer_CFLAGS} ${fuzzer_CFLAGS}'])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
AC_MSG_RESULT([yes])
], [
AC_MSG_RESULT([no])
AC_MSG_ERROR([Options are not supported.])
])
CFLAGS="$save_CFLAGS"
])
]) # AX_SANITIZER
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