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(2.64)
6AC_INIT(libssp, 1.0)
7AC_CONFIG_SRCDIR(ssp.c)
8AC_CANONICAL_SYSTEM
9ACX_NONCANONICAL_TARGET
10
11AM_INIT_AUTOMAKE([no-dist])
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_force([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])
75AC_ARG_ENABLE(symvers,
76AS_HELP_STRING([--disable-symvers],
77  [disable symbol versioning for libssp]),
78ssp_use_symver=$enableval,
79ssp_use_symver=yes)
80if test "x$ssp_use_symver" != xno; then
81  if test x$gcc_no_link = xyes; then
82    # If we cannot link, we cannot build shared libraries, so do not use
83    # symbol versioning.
84    ssp_use_symver=no
85  else
86    save_LDFLAGS="$LDFLAGS"
87    LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
88    cat > conftest.map <<EOF
89FOO_1.0 {
90  global: *foo*; bar; local: *;
91};
92EOF
93    AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
94    if test x$ssp_use_symver = xno; then
95      case "$target_os" in
96        solaris2*)
97          LDFLAGS="$save_LDFLAGS"
98          LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
99          # Sun ld cannot handle wildcards and treats all entries as undefined.
100          cat > conftest.map <<EOF
101FOO_1.0 {
102  global: foo; local: *;
103};
104EOF
105          AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
106	  ;;
107      esac
108    fi
109    LDFLAGS="$save_LDFLAGS"
110  fi
111fi
112AC_MSG_RESULT($ssp_use_symver)
113AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
114AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
115AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
116
117AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
118
119if test x$gcc_no_link = xyes; then
120  # Presume the ISO C functions are available; add target-specific
121  # configuration here if required.
122  AC_DEFINE(HAVE_STRNCPY)
123  AC_DEFINE(HAVE_STRNCAT)
124else
125  AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
126fi
127
128AC_MSG_CHECKING([whether vsnprintf is usable])
129AC_RUN_IFELSE(AC_LANG_PROGRAM([
130#include <stdarg.h>
131#include <string.h>
132#include <stdio.h>
133int foo (char *buf, size_t n, const char *fmt, ...)
134{
135  va_list ap;
136  int ret;
137  va_start (ap, fmt);
138  ret = vsnprintf (buf, n, fmt, ap);
139  va_end (ap);
140  return ret;
141}],
142[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
143 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
144   return 1;
145 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
146[ssp_have_usable_vsnprintf=define],
147[ssp_have_usable_vsnprintf=undef],
148[ssp_have_usable_vsnprintf=undef])
149if test "x$ssp_have_usable_vsnprintf" = xdefine; then
150  AC_MSG_RESULT(yes)
151  AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
152else
153  AC_MSG_RESULT(no)
154fi
155AC_SUBST(ssp_have_usable_vsnprintf)
156
157AM_PROG_LIBTOOL
158ACX_LT_HOST_FLAGS
159AC_SUBST(enable_shared)
160AC_SUBST(enable_static)
161
162# Calculate toolexeclibdir
163# Also toolexecdir, though it's only used in toolexeclibdir
164case ${version_specific_libs} in
165  yes)
166    # Need the gcc compiler version to know where to install libraries
167    # and header files if --enable-version-specific-runtime-libs option
168    # is selected.
169    toolexecdir='$(libdir)/gcc/$(target_alias)'
170    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
171    ;;
172  no)
173    if test -n "$with_cross_host" &&
174       test x"$with_cross_host" != x"no"; then
175      # Install a library built with a cross compiler in tooldir, not libdir.
176      toolexecdir='$(exec_prefix)/$(target_alias)'
177      toolexeclibdir='$(toolexecdir)/lib'
178    else
179      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
180      toolexeclibdir='$(libdir)'
181    fi
182    multi_os_directory=`$CC -print-multi-os-directory`
183    case $multi_os_directory in
184      .) ;; # Avoid trailing /.
185      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
186    esac
187    ;;
188esac
189AC_SUBST(toolexecdir)
190AC_SUBST(toolexeclibdir)
191
192if test ${multilib} = yes; then
193  multilib_arg="--enable-multilib"
194else
195  multilib_arg=
196fi
197
198AC_CONFIG_FILES([Makefile ssp/ssp.h])
199AC_OUTPUT
200