1# Process this file with autoconf to produce a configure script, like so:
2#
3# aclocal -I .. -I ../config && autoconf && autoheader && automake
4
5AC_INIT(libssp, 1.0)
6AC_CONFIG_SRCDIR(ssp.c)
7AC_CANONICAL_SYSTEM
8ACX_NONCANONICAL_TARGET
9
10AM_INIT_AUTOMAKE([no-dist])
11
12AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
13AC_ARG_ENABLE(version-specific-runtime-libs,
14[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
15[case "$enableval" in
16 yes) version_specific_libs=yes ;;
17 no)  version_specific_libs=no ;;
18 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
19 esac],
20[version_specific_libs=no])
21AC_MSG_RESULT($version_specific_libs)
22
23AM_MAINTAINER_MODE
24
25GCC_NO_EXECUTABLES
26
27AM_ENABLE_MULTILIB(, ..)
28
29target_alias=${target_alias-$host_alias}
30AC_SUBST(target_alias)
31
32AC_CONFIG_HEADERS(config.h)
33
34AC_LANG_C
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.
39
40m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
41m4_define([_AC_ARG_VAR_PRECIOUS],[])
42AC_PROG_CC
43m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
44
45AC_SUBST(CFLAGS)
46
47if test "x$GCC" != "xyes"; then
48  AC_MSG_ERROR([libssp must be built with GCC])
49fi
50AC_PROG_CPP
51
52AC_MSG_CHECKING([whether -fstack-protector works])
53save_CFLAGS="$CFLAGS"
54CFLAGS="$CFLAGS -fstack-protector -Werror"
55AC_TRY_COMPILE([
56void __attribute__((noinline)) bar (char *x)
57{
58  __builtin_memset (x, 0, 64);
59}],[char buf[64]; bar (buf);],
60[AC_MSG_RESULT(yes)],
61[AC_MSG_RESULT(no)])
62CFLAGS="$save_CFLAGS"
63
64# Add CET specific flags if CET is enabled
65GCC_CET_FLAGS(CET_FLAGS)
66XCFLAGS="$XCFLAGS $CET_FLAGS"
67AC_SUBST(XCFLAGS)
68
69AC_MSG_CHECKING([whether hidden visibility is supported])
70AC_TRY_COMPILE([
71void __attribute__((visibility ("hidden"))) bar (void) {}],,
72[ssp_hidden=yes],[ssp_hidden=no])
73AC_MSG_RESULT($ssp_hidden)
74if test x$ssp_hidden = xyes; then
75  AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
76fi
77
78AC_MSG_CHECKING([whether symbol versioning is supported])
79AC_ARG_ENABLE(symvers,
80AS_HELP_STRING([--disable-symvers],
81  [disable symbol versioning for libssp]),
82ssp_use_symver=$enableval,
83ssp_use_symver=yes)
84if 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
87    # symbol versioning.
88    ssp_use_symver=no
89  else
90    save_LDFLAGS="$LDFLAGS"
91    LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
92    cat > conftest.map <<EOF
93FOO_1.0 {
94  global: *foo*; bar; local: *;
95};
96EOF
97    AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
98    if test x$ssp_use_symver = xno; then
99      case "$target_os" in
100        solaris2*)
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
105FOO_1.0 {
106  global: foo; local: *;
107};
108EOF
109          AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
110	  ;;
111      esac
112    fi
113    LDFLAGS="$save_LDFLAGS"
114  fi
115fi
116AC_MSG_RESULT($ssp_use_symver)
117AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
118AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
119AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
120
121AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
122
123if test x$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)
128else
129  AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
130fi
131
132AC_MSG_CHECKING([whether vsnprintf is usable])
133AC_RUN_IFELSE([AC_LANG_PROGRAM([
134#include <stdarg.h>
135#include <string.h>
136#include <stdio.h>
137int foo (char *buf, size_t n, const char *fmt, ...)
138{
139  va_list ap;
140  int ret;
141  va_start (ap, fmt);
142  ret = vsnprintf (buf, n, fmt, ap);
143  va_end (ap);
144  return ret;
145}],
146[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
147 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
148   return 1;
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])
153if test "x$ssp_have_usable_vsnprintf" = xdefine; then
154  AC_MSG_RESULT(yes)
155  AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
156else
157  AC_MSG_RESULT(no)
158fi
159AC_SUBST(ssp_have_usable_vsnprintf)
160
161AM_PROG_LIBTOOL
162ACX_LT_HOST_FLAGS
163AC_SUBST(enable_shared)
164AC_SUBST(enable_static)
165
166GCC_WITH_TOOLEXECLIBDIR
167
168# Calculate toolexeclibdir
169# Also toolexecdir, though it's only used in toolexeclibdir
170case ${version_specific_libs} in
171  yes)
172    # Need the gcc compiler version to know where to install libraries
173    # and header files if --enable-version-specific-runtime-libs option
174    # is selected.
175    toolexecdir='$(libdir)/gcc/$(target_alias)'
176    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
177    ;;
178  no)
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 ${with_toolexeclibdir} in
184	no)
185	  toolexeclibdir='$(toolexecdir)/lib'
186	  ;;
187	*)
188	  toolexeclibdir=${with_toolexeclibdir}
189	  ;;
190      esac
191    else
192      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
193      toolexeclibdir='$(libdir)'
194    fi
195    multi_os_directory=`$CC -print-multi-os-directory`
196    case $multi_os_directory in
197      .) ;; # Avoid trailing /.
198      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
199    esac
200    ;;
201esac
202AC_SUBST(toolexecdir)
203AC_SUBST(toolexeclibdir)
204
205if test ${multilib} = yes; then
206  multilib_arg="--enable-multilib"
207else
208  multilib_arg=
209fi
210
211# Determine what GCC version number to use in filesystem paths.
212GCC_BASE_VER
213
214AC_CONFIG_FILES([Makefile ssp/ssp.h])
215AC_OUTPUT
216