175 lines
4.9 KiB
Plaintext
175 lines
4.9 KiB
Plaintext
# Process this file with autoconf to produce a configure script, like so:
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#
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# aclocal -I .. -I ../config && autoconf && autoheader && automake
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AC_PREREQ(2.59)
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AC_INIT(libssp, 1.0)
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AC_CONFIG_SRCDIR(ssp.c)
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AC_CANONICAL_SYSTEM
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ACX_NONCANONICAL_TARGET
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AM_INIT_AUTOMAKE
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AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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AC_ARG_ENABLE(version-specific-runtime-libs,
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[ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
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[case "$enableval" in
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yes) version_specific_libs=yes ;;
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no) version_specific_libs=no ;;
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*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
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esac],
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[version_specific_libs=no])
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AC_MSG_RESULT($version_specific_libs)
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AM_MAINTAINER_MODE
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GCC_NO_EXECUTABLES
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AM_ENABLE_MULTILIB(, ..)
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target_alias=${target_alias-$host_alias}
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AC_SUBST(target_alias)
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AC_CONFIG_HEADERS(config.h)
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AC_LANG_C
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# The same as in boehm-gc and libstdc++. Have to borrow it from there.
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# We must force CC to /not/ be precious variables; otherwise
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# the wrong, non-multilib-adjusted value will be used in multilibs.
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# As a side effect, we have to subst CFLAGS ourselves.
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m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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m4_define([_AC_ARG_VAR_PRECIOUS],[])
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AC_PROG_CC
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m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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AC_SUBST(CFLAGS)
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if test "x$GCC" != "xyes"; then
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AC_MSG_ERROR([libssp must be built with GCC])
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fi
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AC_PROG_CPP
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AC_MSG_CHECKING([whether -fstack-protector works])
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -fstack-protector -Werror"
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AC_TRY_COMPILE([
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void __attribute__((noinline)) bar (char *x)
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{
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__builtin_memset (x, 0, 64);
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}],[char buf[64]; bar (buf);],
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[AC_MSG_RESULT(yes)],
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[AC_MSG_RESULT(no)])
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CFLAGS="$save_CFLAGS"
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AC_MSG_CHECKING([whether hidden visibility is supported])
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AC_TRY_COMPILE([
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void __attribute__((visibility ("hidden"))) bar (void) {}],,
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[ssp_hidden=yes],[ssp_hidden=no])
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AC_MSG_RESULT($ssp_hidden)
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if test x$ssp_hidden = xyes; then
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AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
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fi
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AC_MSG_CHECKING([whether symbol versioning is supported])
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cat > conftest.map <<EOF
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FOO_1.0 {
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global: *foo*; bar; local: *;
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};
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EOF
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save_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
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if test x$gcc_no_link = xyes; then
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# If we cannot link, we cannot build shared libraries, so do not use
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# symbol versioning.
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ssp_use_symver=no
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else
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AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no])
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fi
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LDFLAGS="$save_LDFLAGS"
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AC_MSG_RESULT($ssp_use_symver)
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AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes])
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AC_CHECK_HEADERS(alloca.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
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if test x$gcc_no_link = xyes; then
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# Presume the ISO C functions are available; add target-specific
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# configuration here if required.
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AC_DEFINE(HAVE_STRNCPY)
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AC_DEFINE(HAVE_STRNCAT)
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else
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AC_CHECK_FUNCS(mempcpy strncpy strncat)
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fi
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AC_MSG_CHECKING([whether vsnprintf is usable])
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AC_RUN_IFELSE(AC_LANG_PROGRAM([
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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int foo (char *buf, size_t n, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start (ap, fmt);
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ret = vsnprintf (buf, n, fmt, ap);
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va_end (ap);
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return ret;
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}],
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[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
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if (foo (buf, 4, ".%s.", "CDEFG") != 7)
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return 1;
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return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
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[ssp_have_usable_vsnprintf=define],
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[ssp_have_usable_vsnprintf=undef],
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[ssp_have_usable_vsnprintf=undef])
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if test "x$ssp_have_usable_vsnprintf" = xdefine; then
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AC_MSG_RESULT(yes)
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AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
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else
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AC_MSG_RESULT(no)
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fi
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AC_SUBST(ssp_have_usable_vsnprintf)
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AM_PROG_LIBTOOL
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AC_SUBST(enable_shared)
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AC_SUBST(enable_static)
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# Calculate toolexeclibdir
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# Also toolexecdir, though it's only used in toolexeclibdir
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case ${version_specific_libs} in
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yes)
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# Need the gcc compiler version to know where to install libraries
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# and header files if --enable-version-specific-runtime-libs option
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# is selected.
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toolexecdir='$(libdir)/gcc/$(target_alias)'
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toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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;;
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no)
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if test -n "$with_cross_host" &&
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test x"$with_cross_host" != x"no"; then
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# Install a library built with a cross compiler in tooldir, not libdir.
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toolexecdir='$(exec_prefix)/$(target_alias)'
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toolexeclibdir='$(toolexecdir)/lib'
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else
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toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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toolexeclibdir='$(libdir)'
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fi
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multi_os_directory=`$CC -print-multi-os-directory`
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case $multi_os_directory in
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.) ;; # Avoid trailing /.
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*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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esac
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;;
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esac
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AC_SUBST(toolexecdir)
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AC_SUBST(toolexeclibdir)
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if test ${multilib} = yes; then
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multilib_arg="--enable-multilib"
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else
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multilib_arg=
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fi
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AC_CONFIG_FILES([Makefile ssp/ssp.h])
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AC_OUTPUT
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