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
65# Add CET specific flags if CET is enabled
66GCC_CET_FLAGS(CET_FLAGS)
67XCFLAGS="$XCFLAGS $CET_FLAGS"
68AC_SUBST(XCFLAGS)
69
70AC_MSG_CHECKING([whether hidden visibility is supported])
71AC_TRY_COMPILE([
72void __attribute__((visibility ("hidden"))) bar (void) {}],,
73[ssp_hidden=yes],[ssp_hidden=no])
74AC_MSG_RESULT($ssp_hidden)
75if test x$ssp_hidden = xyes; then
76  AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
77fi
78
79AC_MSG_CHECKING([whether symbol versioning is supported])
80AC_ARG_ENABLE(symvers,
81AS_HELP_STRING([--disable-symvers],
82  [disable symbol versioning for libssp]),
83ssp_use_symver=$enableval,
84ssp_use_symver=yes)
85if test "x$ssp_use_symver" != xno; then
86  if test x$gcc_no_link = xyes; then
87    # If we cannot link, we cannot build shared libraries, so do not use
88    # symbol versioning.
89    ssp_use_symver=no
90  else
91    save_LDFLAGS="$LDFLAGS"
92    LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
93    cat > conftest.map <<EOF
94FOO_1.0 {
95  global: *foo*; bar; local: *;
96};
97EOF
98    AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
99    if test x$ssp_use_symver = xno; then
100      case "$target_os" in
101        solaris2*)
102          LDFLAGS="$save_LDFLAGS"
103          LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
104          # Sun ld cannot handle wildcards and treats all entries as undefined.
105          cat > conftest.map <<EOF
106FOO_1.0 {
107  global: foo; local: *;
108};
109EOF
110          AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
111	  ;;
112      esac
113    fi
114    LDFLAGS="$save_LDFLAGS"
115  fi
116fi
117AC_MSG_RESULT($ssp_use_symver)
118AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
119AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
120AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
121
122AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
123
124if test x$gcc_no_link = xyes; then
125  # Presume the ISO C functions are available; add target-specific
126  # configuration here if required.
127  AC_DEFINE(HAVE_STRNCPY)
128  AC_DEFINE(HAVE_STRNCAT)
129else
130  AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
131fi
132
133AC_MSG_CHECKING([whether vsnprintf is usable])
134AC_RUN_IFELSE(AC_LANG_PROGRAM([
135#include <stdarg.h>
136#include <string.h>
137#include <stdio.h>
138int foo (char *buf, size_t n, const char *fmt, ...)
139{
140  va_list ap;
141  int ret;
142  va_start (ap, fmt);
143  ret = vsnprintf (buf, n, fmt, ap);
144  va_end (ap);
145  return ret;
146}],
147[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
148 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
149   return 1;
150 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
151[ssp_have_usable_vsnprintf=define],
152[ssp_have_usable_vsnprintf=undef],
153[ssp_have_usable_vsnprintf=undef])
154if test "x$ssp_have_usable_vsnprintf" = xdefine; then
155  AC_MSG_RESULT(yes)
156  AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
157else
158  AC_MSG_RESULT(no)
159fi
160AC_SUBST(ssp_have_usable_vsnprintf)
161
162AM_PROG_LIBTOOL
163ACX_LT_HOST_FLAGS
164AC_SUBST(enable_shared)
165AC_SUBST(enable_static)
166
167# Calculate toolexeclibdir
168# Also toolexecdir, though it's only used in toolexeclibdir
169case ${version_specific_libs} in
170  yes)
171    # Need the gcc compiler version to know where to install libraries
172    # and header files if --enable-version-specific-runtime-libs option
173    # is selected.
174    toolexecdir='$(libdir)/gcc/$(target_alias)'
175    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
176    ;;
177  no)
178    if test -n "$with_cross_host" &&
179       test x"$with_cross_host" != x"no"; then
180      # Install a library built with a cross compiler in tooldir, not libdir.
181      toolexecdir='$(exec_prefix)/$(target_alias)'
182      toolexeclibdir='$(toolexecdir)/lib'
183    else
184      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
185      toolexeclibdir='$(libdir)'
186    fi
187    multi_os_directory=`$CC -print-multi-os-directory`
188    case $multi_os_directory in
189      .) ;; # Avoid trailing /.
190      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
191    esac
192    ;;
193esac
194AC_SUBST(toolexecdir)
195AC_SUBST(toolexeclibdir)
196
197if test ${multilib} = yes; then
198  multilib_arg="--enable-multilib"
199else
200  multilib_arg=
201fi
202
203# Determine what GCC version number to use in filesystem paths.
204GCC_BASE_VER
205
206AC_CONFIG_FILES([Makefile ssp/ssp.h])
207AC_OUTPUT
208