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a3090c2c98
The 30379efad1 added _FORTIFY_SOURCE checks without check if compiler
does support all used fortify levels. This patch fixes it by first
checking at configure time the maximum support fortify level and using
it instead of a pre-defined one.
Checked on x86_64 with gcc 11, 12, and 13.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Tested-by: Florian Weimer <fweimer@redhat.com>
143 lines
4.7 KiB
Bash
143 lines
4.7 KiB
Bash
#! /bin/sh
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# Copyright (C) 2016-2023 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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# For each installed header, confirm that it's possible to compile a
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# file that includes that header and does nothing else, in several
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# different compilation modes.
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# These compilation switches assume GCC or compatible, which is probably
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# fine since we also assume that when _building_ glibc.
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c_modes="-std=c89 -std=gnu89 -std=c11 -std=gnu11"
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cxx_modes="-std=c++98 -std=gnu++98 -std=c++11 -std=gnu++11"
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# An exhaustive test of feature selection macros would take far too long.
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# These are probably the most commonly used three.
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lib_modes="-D_DEFAULT_SOURCE=1 -D_GNU_SOURCE=1 -D_XOPEN_SOURCE=700"
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# Also check for fortify modes, since it might be enabled as default. The
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# maximum value to be checked is define by maximum_fortify argument.
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fortify_modes=""
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if [ $# -lt 3 ]; then
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echo "usage: $0 c|c++ maximum_fortify \"compile command\" header header header..." >&2
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exit 2
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fi
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case "$1" in
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(c)
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lang_modes="$c_modes"
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cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.c)
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;;
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(c++)
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lang_modes="$cxx_modes"
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cih_test_c=$(mktemp ${TMPDIR-/tmp}/cih_test_XXXXXX.cc)
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;;
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(*)
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echo "usage: $0 c|c++ \"compile command\" header header header..." >&2
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exit 2;;
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esac
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shift
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fortify_modes=$(seq -s' ' 1 $1)
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shift
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cc_cmd="$1"
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shift
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trap "rm -f '$cih_test_c'" 0
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failed=0
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is_x86_64=unknown
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for header in "$@"; do
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# Skip various headers for which this test gets a false failure.
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case "$header" in
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# bits/* are not meant to be included directly and usually #error
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# out if you try it.
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# regexp.h is a stub containing only an #error.
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# Sun RPC's .x files are traditionally installed in
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# $prefix/include/rpcsvc, but they are not C header files.
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(bits/* | regexp.h | rpcsvc/*.x)
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continue;;
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# All extant versions of sys/elf.h contain nothing more than an
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# exhortation (either a #warning or an #error) to use sys/procfs.h
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# instead, plus an inclusion of that header.
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(sys/elf.h)
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continue;;
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# Skip Fortran headers.
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(finclude/*)
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continue;;
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# sys/vm86.h is "unsupported on x86-64" and errors out on that target.
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(sys/vm86.h)
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case "$is_x86_64" in
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(yes) continue;;
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(no) ;;
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(unknown)
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cat >"$cih_test_c" <<EOF
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#if defined __x86_64__ && __x86_64__
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#error "is x86-64"
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#endif
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EOF
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if $cc_cmd -fsyntax-only "$cih_test_c" > /dev/null 2>&1
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then
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is_x86_64=no
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else
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is_x86_64=yes
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continue
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fi
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;;
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esac
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;;
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esac
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echo :: "$header"
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for lang_mode in "" $lang_modes; do
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for lib_mode in "" $lib_modes; do
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for fortify_mode in "" $fortify_modes; do
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if [ -z "$lib_mode" ]; then
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expanded_lib_mode='/* default library mode */'
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else
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expanded_lib_mode=$(echo : $lib_mode | \
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sed 's/^: -D/#define /; s/=/ /')
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fi
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if [ ! -z $fortify_mode ]; then
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fortify_mode="#define _FORTIFY_SOURCE $fortify_mode"
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fi
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echo :::: $lang_mode $lib_mode $fortify_mode
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cat >"$cih_test_c" <<EOF
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/* These macros may have been defined on the command line. They are
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inappropriate for this test. */
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#undef _LIBC
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#undef _GNU_SOURCE
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#undef _FORTIFY_SOURCE
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$fortify_mode
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/* The library mode is selected here rather than on the command line to
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ensure that this selection wins. */
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$expanded_lib_mode
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#include <$header>
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int avoid_empty_translation_unit;
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EOF
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if $cc_cmd -finput-charset=ascii -fsyntax-only $lang_mode \
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"$cih_test_c" 2>&1
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then :
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else failed=1
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fi
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done
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done
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done
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done
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exit $failed
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