1 # Process this file with autoconf to produce a configure script, like so:
3 # aclocal -I .. -I ../config && autoconf && autoheader && automake
6 AC_CONFIG_SRCDIR(ssp.c)
8 ACX_NONCANONICAL_TARGET
10 AM_INIT_AUTOMAKE([no-dist])
12 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
13 AC_ARG_ENABLE(version-specific-runtime-libs,
14 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
16 yes) version_specific_libs=yes ;;
17 no) version_specific_libs=no ;;
18 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
20 [version_specific_libs=no])
21 AC_MSG_RESULT($version_specific_libs)
27 AM_ENABLE_MULTILIB(, ..)
29 target_alias=${target_alias-$host_alias}
30 AC_SUBST(target_alias)
32 AC_CONFIG_HEADERS(config.h)
35 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
36 # We must force CC to /not/ be precious variables; otherwise
37 # the wrong, non-multilib-adjusted value will be used in multilibs.
38 # As a side effect, we have to subst CFLAGS ourselves.
40 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
41 m4_define([_AC_ARG_VAR_PRECIOUS],[])
43 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
47 if test "x$GCC" != "xyes"; then
48 AC_MSG_ERROR([libssp must be built with GCC])
52 AC_MSG_CHECKING([whether -fstack-protector works])
54 CFLAGS="$CFLAGS -fstack-protector -Werror"
56 void __attribute__((noinline)) bar (char *x)
58 __builtin_memset (x, 0, 64);
59 }],[char buf[64]; bar (buf);],
64 # Add CET specific flags if CET is enabled
65 GCC_CET_FLAGS(CET_FLAGS)
66 XCFLAGS="$XCFLAGS $CET_FLAGS"
69 AC_MSG_CHECKING([whether hidden visibility is supported])
71 void __attribute__((visibility ("hidden"))) bar (void) {}],,
72 [ssp_hidden=yes],[ssp_hidden=no])
73 AC_MSG_RESULT($ssp_hidden)
74 if test x$ssp_hidden = xyes; then
75 AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
78 AC_MSG_CHECKING([whether symbol versioning is supported])
79 AC_ARG_ENABLE(symvers,
80 AS_HELP_STRING([--disable-symvers],
81 [disable symbol versioning for libssp]),
82 ssp_use_symver=$enableval,
84 if test "x$ssp_use_symver" != xno; then
85 if test x$gcc_no_link = xyes; then
86 # If we cannot link, we cannot build shared libraries, so do not use
90 save_LDFLAGS="$LDFLAGS"
91 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
92 cat > conftest.map <<EOF
94 global: *foo*; bar; local: *;
97 AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
98 if test x$ssp_use_symver = xno; then
101 LDFLAGS="$save_LDFLAGS"
102 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
103 # Sun ld cannot handle wildcards and treats all entries as undefined.
104 cat > conftest.map <<EOF
106 global: foo; local: *;
109 AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
113 LDFLAGS="$save_LDFLAGS"
116 AC_MSG_RESULT($ssp_use_symver)
117 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
118 AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
119 AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
121 AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
123 if test x$gcc_no_link = xyes; then
124 # Presume the ISO C functions are available; add target-specific
125 # configuration here if required.
126 AC_DEFINE(HAVE_STRNCPY)
127 AC_DEFINE(HAVE_STRNCAT)
129 AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
132 AC_MSG_CHECKING([whether vsnprintf is usable])
133 AC_RUN_IFELSE([AC_LANG_PROGRAM([
137 int foo (char *buf, size_t n, const char *fmt, ...)
142 ret = vsnprintf (buf, n, fmt, ap);
146 [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
147 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
149 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;])],
150 [ssp_have_usable_vsnprintf=define],
151 [ssp_have_usable_vsnprintf=undef],
152 [ssp_have_usable_vsnprintf=undef])
153 if test "x$ssp_have_usable_vsnprintf" = xdefine; then
155 AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
159 AC_SUBST(ssp_have_usable_vsnprintf)
163 AC_SUBST(enable_shared)
164 AC_SUBST(enable_static)
166 GCC_WITH_TOOLEXECLIBDIR
168 # Calculate toolexeclibdir
169 # Also toolexecdir, though it's only used in toolexeclibdir
170 case ${version_specific_libs} in
172 # Need the gcc compiler version to know where to install libraries
173 # and header files if --enable-version-specific-runtime-libs option
175 toolexecdir='$(libdir)/gcc/$(target_alias)'
176 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
179 if test -n "$with_cross_host" &&
180 test x"$with_cross_host" != x"no"; then
181 # Install a library built with a cross compiler in tooldir, not libdir.
182 toolexecdir='$(exec_prefix)/$(target_alias)'
183 case ${with_toolexeclibdir} in
185 toolexeclibdir='$(toolexecdir)/lib'
188 toolexeclibdir=${with_toolexeclibdir}
192 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
193 toolexeclibdir='$(libdir)'
195 multi_os_directory=`$CC -print-multi-os-directory`
196 case $multi_os_directory in
197 .) ;; # Avoid trailing /.
198 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
202 AC_SUBST(toolexecdir)
203 AC_SUBST(toolexeclibdir)
205 if test ${multilib} = yes; then
206 multilib_arg="--enable-multilib"
211 # Determine what GCC version number to use in filesystem paths.
214 AC_CONFIG_FILES([Makefile ssp/ssp.h])