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# Process this file with autoconf to produce a configure script, like so:
#
# aclocal -I .. -I ../config && autoconf && autoheader && automake
AC_PREREQ(2.64)
AC_INIT(libssp, 1.0)
AC_CONFIG_SRCDIR(ssp.c)
AC_CANONICAL_SYSTEM
ACX_NONCANONICAL_TARGET
AM_INIT_AUTOMAKE([no-dist])
AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE(version-specific-runtime-libs,
[ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
[case "$enableval" in
yes) version_specific_libs=yes ;;
no) version_specific_libs=no ;;
*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
esac],
[version_specific_libs=no])
AC_MSG_RESULT($version_specific_libs)
AM_MAINTAINER_MODE
GCC_NO_EXECUTABLES
AM_ENABLE_MULTILIB(, ..)
target_alias=${target_alias-$host_alias}
AC_SUBST(target_alias)
AC_CONFIG_HEADERS(config.h)
AC_LANG_C
# The same as in boehm-gc and libstdc++. Have to borrow it from there.
# We must force CC to /not/ be precious variables; otherwise
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.
m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
AC_SUBST(CFLAGS)
if test "x$GCC" != "xyes"; then
AC_MSG_ERROR([libssp must be built with GCC])
fi
AC_PROG_CPP
AC_MSG_CHECKING([whether -fstack-protector works])
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fstack-protector -Werror"
AC_TRY_COMPILE([
void __attribute__((noinline)) bar (char *x)
{
__builtin_memset (x, 0, 64);
}],[char buf[64]; bar (buf);],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)])
CFLAGS="$save_CFLAGS"
AC_MSG_CHECKING([whether hidden visibility is supported])
AC_TRY_COMPILE([
void __attribute__((visibility ("hidden"))) bar (void) {}],,
[ssp_hidden=yes],[ssp_hidden=no])
AC_MSG_RESULT($ssp_hidden)
if test x$ssp_hidden = xyes; then
AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
fi
AC_MSG_CHECKING([whether symbol versioning is supported])
AC_ARG_ENABLE(symvers,
AS_HELP_STRING([--disable-symvers],
[disable symbol versioning for libssp]),
ssp_use_symver=$enableval,
ssp_use_symver=yes)
if test "x$ssp_use_symver" != xno; then
if test x$gcc_no_link = xyes; then
# If we cannot link, we cannot build shared libraries, so do not use
# symbol versioning.
ssp_use_symver=no
else
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
cat > conftest.map <<EOF
FOO_1.0 {
global: *foo*; bar; local: *;
};
EOF
AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
if test x$ssp_use_symver = xno; then
case "$target_os" in
solaris2*)
LDFLAGS="$save_LDFLAGS"
LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
# Sun ld cannot handle wildcards and treats all entries as undefined.
cat > conftest.map <<EOF
FOO_1.0 {
global: foo; local: *;
};
EOF
AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
;;
esac
fi
LDFLAGS="$save_LDFLAGS"
fi
fi
AC_MSG_RESULT($ssp_use_symver)
AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
if test x$gcc_no_link = xyes; then
# Presume the ISO C functions are available; add target-specific
# configuration here if required.
AC_DEFINE(HAVE_STRNCPY)
AC_DEFINE(HAVE_STRNCAT)
else
AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
fi
AC_MSG_CHECKING([whether vsnprintf is usable])
AC_RUN_IFELSE(AC_LANG_PROGRAM([
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
int foo (char *buf, size_t n, const char *fmt, ...)
{
va_list ap;
int ret;
va_start (ap, fmt);
ret = vsnprintf (buf, n, fmt, ap);
va_end (ap);
return ret;
}],
[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
if (foo (buf, 4, ".%s.", "CDEFG") != 7)
return 1;
return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
[ssp_have_usable_vsnprintf=define],
[ssp_have_usable_vsnprintf=undef],
# Google-local: Assume this always works if cross-compiling.
[ssp_have_usable_vsnprintf=define])
if test "x$ssp_have_usable_vsnprintf" = xdefine; then
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
else
AC_MSG_RESULT(no)
fi
AC_SUBST(ssp_have_usable_vsnprintf)
AM_PROG_LIBTOOL
ACX_LT_HOST_FLAGS
AC_SUBST(enable_shared)
AC_SUBST(enable_static)
# Calculate toolexeclibdir
# Also toolexecdir, though it's only used in toolexeclibdir
case ${version_specific_libs} in
yes)
# Need the gcc compiler version to know where to install libraries
# and header files if --enable-version-specific-runtime-libs option
# is selected.
toolexecdir='$(libdir)/gcc/$(target_alias)'
toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
;;
no)
if test -n "$with_cross_host" &&
test x"$with_cross_host" != x"no"; then
# Install a library built with a cross compiler in tooldir, not libdir.
toolexecdir='$(exec_prefix)/$(target_alias)'
toolexeclibdir='$(toolexecdir)/lib'
else
toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
toolexeclibdir='$(libdir)'
fi
multi_os_directory=`$CC -print-multi-os-directory`
case $multi_os_directory in
.) ;; # Avoid trailing /.
*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
esac
;;
esac
AC_SUBST(toolexecdir)
AC_SUBST(toolexeclibdir)
if test ${multilib} = yes; then
multilib_arg="--enable-multilib"
else
multilib_arg=
fi
AC_CONFIG_FILES([Makefile ssp/ssp.h])
AC_OUTPUT
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