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# libguestfs
# Copyright (C) 2009-2023 Red Hat Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
dnl The C compiler environment.
dnl Define the host CPU architecture (defines 'host_cpu')
AC_CANONICAL_HOST
dnl Check for basic C environment.
AC_PROG_CC_STDC
AC_PROG_INSTALL
AC_PROG_CPP
AC_C_PROTOTYPES
test "x$U" != "x" && AC_MSG_ERROR([Compiler not ANSI compliant])
AM_PROG_CC_C_O
AC_ARG_ENABLE([werror],
[AS_HELP_STRING([--enable-werror],
[turn on lots of GCC warnings (for developers)])],
[case $enableval in
yes|no) ;;
*) AC_MSG_ERROR([bad value $enableval for werror option]) ;;
esac
gcc_warnings=$enableval],
[gcc_warnings=no]
)
WARN_CFLAGS="-Wall"
AC_SUBST([WARN_CFLAGS])
if test "x$gcc_warnings" = "xyes"; then
WERROR_CFLAGS="-Werror"
fi
AC_SUBST([WERROR_CFLAGS])
# Provide a global place to set CFLAGS. (Note that setting AM_CFLAGS
# is no use because it doesn't override target_CFLAGS).
#---
# Kill -fstrict-overflow which is a license for the C compiler to make
# dubious and often unsafe optimizations, in a time-wasting attempt to
# deal with CPU architectures that do not exist.
CFLAGS="$CFLAGS -fno-strict-overflow -Wno-strict-overflow"
dnl Work out how to specify the linker script to the linker.
AS_CASE([$host_os],
[darwin*], [MAP_SCRIPT_FLAGS="-Wl,-map"],
[MAP_SCRIPT_FLAGS="-Wl,-M"])
VERSION_SCRIPT_FLAGS=-Wl,--version-script=
`/usr/bin/ld --help 2>&1 | grep -- --version-script >/dev/null` || \
VERSION_SCRIPT_FLAGS="$MAP_SCRIPT_FLAGS -Wl,"
AC_SUBST(VERSION_SCRIPT_FLAGS)
dnl Use -fvisibility=hidden by default in the library.
dnl http://gcc.gnu.org/wiki/Visibility
AS_IF([test -n "$GCC"],
[AC_SUBST([GCC_VISIBILITY_HIDDEN], [-fvisibility=hidden])],
[AC_SUBST([GCC_VISIBILITY_HIDDEN], [:])])
dnl Check support for 64 bit file offsets.
AC_SYS_LARGEFILE
dnl Check sizeof long.
AC_CHECK_SIZEOF([long])
dnl Check if __attribute__((cleanup(...))) works.
dnl Set -Werror, otherwise gcc will only emit a warning for attributes
dnl that it doesn't understand.
acx_nbdkit_save_CFLAGS="${CFLAGS}"
CFLAGS="${CFLAGS} -Werror"
AC_MSG_CHECKING([if __attribute__((cleanup(...))) works with this compiler])
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([[
#include <stdio.h>
#include <stdlib.h>
void
freep (void *ptr)
{
exit (EXIT_SUCCESS);
}
void
test (void)
{
__attribute__((cleanup(freep))) char *ptr = malloc (100);
}
int
main (int argc, char *argv[])
{
test ();
exit (EXIT_FAILURE);
}
]])
],[
AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_ATTRIBUTE_CLEANUP],[1],[Define to 1 if '__attribute__((cleanup(...)))' works with this compiler.])
],[
AC_MSG_ERROR(
['__attribute__((cleanup(...)))' does not work.
You may not be using a sufficiently recent version of GCC or CLANG, or
you may be using a C compiler which does not support this attribute,
or the configure test may be wrong.])])
dnl restore CFLAGS
CFLAGS="${acx_nbdkit_save_CFLAGS}"
dnl Define this so that include/guestfs.h is included
dnl instead of the possibly installed <guestfs.h>. This is
dnl only needed when compiling libguestfs itself. It is
dnl expanded in common/ submodule. For other packages like
dnl virt-v2v which also use common/ it is empty.
AC_SUBST([INCLUDE_DIRECTORY], [-I\$\(top_srcdir\)/include])
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