1 # Process this file with autoconf to produce a configure script, like so:
3 # aclocal -I .. -I ../config && autoconf && autoheader && automake
7 AC_CONFIG_SRCDIR(ssp.c)
9 ACX_NONCANONICAL_TARGET
13 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
14 AC_ARG_ENABLE(version-specific-runtime-libs,
15 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
17 yes) version_specific_libs=yes ;;
18 no) version_specific_libs=no ;;
19 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
21 [version_specific_libs=no])
22 AC_MSG_RESULT($version_specific_libs)
28 AM_ENABLE_MULTILIB(, ..)
30 target_alias=${target_alias-$host_alias}
31 AC_SUBST(target_alias)
33 AC_CONFIG_HEADERS(config.h)
36 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
37 # We must force CC to /not/ be precious variables; otherwise
38 # the wrong, non-multilib-adjusted value will be used in multilibs.
39 # As a side effect, we have to subst CFLAGS ourselves.
41 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
42 m4_define([_AC_ARG_VAR_PRECIOUS],[])
44 m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
48 if test "x$GCC" != "xyes"; then
49 AC_MSG_ERROR([libssp must be built with GCC])
53 AC_MSG_CHECKING([whether -fstack-protector works])
55 CFLAGS="$CFLAGS -fstack-protector -Werror"
57 void __attribute__((noinline)) bar (char *x)
59 __builtin_memset (x, 0, 64);
60 }],[char buf[64]; bar (buf);],
65 AC_MSG_CHECKING([whether hidden visibility is supported])
67 void __attribute__((visibility ("hidden"))) bar (void) {}],,
68 [ssp_hidden=yes],[ssp_hidden=no])
69 AC_MSG_RESULT($ssp_hidden)
70 if test x$ssp_hidden = xyes; then
71 AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
74 AC_MSG_CHECKING([whether symbol versioning is supported])
75 cat > conftest.map <<EOF
77 global: *foo*; bar; local: *;
80 save_LDFLAGS="$LDFLAGS"
81 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
82 if test x$gcc_no_link = xyes; then
83 # If we cannot link, we cannot build shared libraries, so do not use
87 AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no])
89 LDFLAGS="$save_LDFLAGS"
90 AC_MSG_RESULT($ssp_use_symver)
91 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes])
93 AC_CHECK_HEADERS(alloca.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
95 if test x$gcc_no_link = xyes; then
96 # Presume the ISO C functions are available; add target-specific
97 # configuration here if required.
98 AC_DEFINE(HAVE_STRNCPY)
99 AC_DEFINE(HAVE_STRNCAT)
101 AC_CHECK_FUNCS(mempcpy strncpy strncat)
104 AC_MSG_CHECKING([whether vsnprintf is usable])
105 AC_RUN_IFELSE(AC_LANG_PROGRAM([
109 int foo (char *buf, size_t n, const char *fmt, ...)
114 ret = vsnprintf (buf, n, fmt, ap);
118 [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
119 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
121 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
122 [ssp_have_usable_vsnprintf=define],
123 [ssp_have_usable_vsnprintf=undef],
124 [ssp_have_usable_vsnprintf=undef])
125 if test "x$ssp_have_usable_vsnprintf" = xdefine; then
127 AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
131 AC_SUBST(ssp_have_usable_vsnprintf)
134 AC_SUBST(enable_shared)
135 AC_SUBST(enable_static)
137 # Calculate toolexeclibdir
138 # Also toolexecdir, though it's only used in toolexeclibdir
139 case ${version_specific_libs} in
141 # Need the gcc compiler version to know where to install libraries
142 # and header files if --enable-version-specific-runtime-libs option
144 toolexecdir='$(libdir)/gcc/$(target_alias)'
145 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
148 if test -n "$with_cross_host" &&
149 test x"$with_cross_host" != x"no"; then
150 # Install a library built with a cross compiler in tooldir, not libdir.
151 toolexecdir='$(exec_prefix)/$(target_alias)'
152 toolexeclibdir='$(toolexecdir)/lib'
154 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
155 toolexeclibdir='$(libdir)'
157 multi_os_directory=`$CC -print-multi-os-directory`
158 case $multi_os_directory in
159 .) ;; # Avoid trailing /.
160 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
164 AC_SUBST(toolexecdir)
165 AC_SUBST(toolexeclibdir)
167 if test ${multilib} = yes; then
168 multilib_arg="--enable-multilib"
173 AC_CONFIG_FILES([Makefile ssp/ssp.h])