1# Process this file with autoconf to produce a configure script, like so:
2# 
3# aclocal -I .. -I ../config && autoconf && autoheader && automake
4
5AC_PREREQ(2.59)
6AC_INIT(libssp, 1.0)
7AC_CONFIG_SRCDIR(ssp.c)
8AC_CANONICAL_SYSTEM
9ACX_NONCANONICAL_TARGET
10
11AM_INIT_AUTOMAKE
12
13AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
14AC_ARG_ENABLE(version-specific-runtime-libs,
15[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
16[case "$enableval" in
17 yes) version_specific_libs=yes ;;
18 no)  version_specific_libs=no ;;
19 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
20 esac],
21[version_specific_libs=no])
22AC_MSG_RESULT($version_specific_libs)
23
24AM_MAINTAINER_MODE
25
26GCC_NO_EXECUTABLES
27
28AM_ENABLE_MULTILIB(, ..)
29
30target_alias=${target_alias-$host_alias}
31AC_SUBST(target_alias)
32
33AC_CONFIG_HEADERS(config.h)
34
35AC_LANG_C
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.
40
41m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
42m4_define([_AC_ARG_VAR_PRECIOUS],[])
43AC_PROG_CC
44m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
45
46AC_SUBST(CFLAGS)
47
48if test "x$GCC" != "xyes"; then
49  AC_MSG_ERROR([libssp must be built with GCC])
50fi
51AC_PROG_CPP
52
53AC_MSG_CHECKING([whether -fstack-protector works])
54save_CFLAGS="$CFLAGS"
55CFLAGS="$CFLAGS -fstack-protector -Werror"
56AC_TRY_COMPILE([
57void __attribute__((noinline)) bar (char *x)
58{
59  __builtin_memset (x, 0, 64);
60}],[char buf[64]; bar (buf);],
61[AC_MSG_RESULT(yes)],
62[AC_MSG_RESULT(no)])
63CFLAGS="$save_CFLAGS"
64
65AC_MSG_CHECKING([whether hidden visibility is supported])
66AC_TRY_COMPILE([
67void __attribute__((visibility ("hidden"))) bar (void) {}],,
68[ssp_hidden=yes],[ssp_hidden=no])
69AC_MSG_RESULT($ssp_hidden)
70if test x$ssp_hidden = xyes; then
71  AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
72fi
73
74AC_MSG_CHECKING([whether symbol versioning is supported])
75cat > conftest.map <<EOF
76FOO_1.0 {
77  global: *foo*; bar; local: *;
78};
79EOF
80save_LDFLAGS="$LDFLAGS"
81LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
82if test x$gcc_no_link = xyes; then
83  # If we cannot link, we cannot build shared libraries, so do not use
84  # symbol versioning.
85  ssp_use_symver=no
86else
87  AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no])
88fi
89LDFLAGS="$save_LDFLAGS"
90AC_MSG_RESULT($ssp_use_symver)
91AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes])
92
93AC_CHECK_HEADERS(alloca.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
94
95if test x$gcc_no_link = xyes; then
96  # Presume the ISO C functions are available; add target-specific
97  # configuration here if required.
98  AC_DEFINE(HAVE_STRNCPY)
99  AC_DEFINE(HAVE_STRNCAT)
100else
101  AC_CHECK_FUNCS(mempcpy strncpy strncat)
102fi
103
104AC_MSG_CHECKING([whether vsnprintf is usable])
105AC_RUN_IFELSE(AC_LANG_PROGRAM([
106#include <stdarg.h>
107#include <string.h>
108#include <stdio.h>
109int foo (char *buf, size_t n, const char *fmt, ...)
110{
111  va_list ap;
112  int ret;
113  va_start (ap, fmt);
114  ret = vsnprintf (buf, n, fmt, ap);
115  va_end (ap);
116  return ret;
117}],
118[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
119 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
120   return 1;
121 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
122[ssp_have_usable_vsnprintf=define],
123[ssp_have_usable_vsnprintf=undef],
124[ssp_have_usable_vsnprintf=undef])
125if test "x$ssp_have_usable_vsnprintf" = xdefine; then
126  AC_MSG_RESULT(yes)
127  AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
128else
129  AC_MSG_RESULT(no)
130fi
131AC_SUBST(ssp_have_usable_vsnprintf)
132
133AM_PROG_LIBTOOL
134AC_SUBST(enable_shared)
135AC_SUBST(enable_static)
136
137# Calculate toolexeclibdir
138# Also toolexecdir, though it's only used in toolexeclibdir
139case ${version_specific_libs} in
140  yes)
141    # Need the gcc compiler version to know where to install libraries
142    # and header files if --enable-version-specific-runtime-libs option
143    # is selected.
144    toolexecdir='$(libdir)/gcc/$(target_alias)'
145    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
146    ;;
147  no)
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='$(toolexecdir)/lib'
153    else
154      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
155      toolexeclibdir='$(libdir)'
156    fi
157    multi_os_directory=`$CC -print-multi-os-directory`
158    case $multi_os_directory in
159      .) ;; # Avoid trailing /.
160      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
161    esac
162    ;;
163esac
164AC_SUBST(toolexecdir)
165AC_SUBST(toolexeclibdir)
166
167if test ${multilib} = yes; then
168  multilib_arg="--enable-multilib"
169else
170  multilib_arg=
171fi
172
173AC_CONFIG_FILES([Makefile ssp/ssp.h])
174AC_OUTPUT
175