libssp/configure.ac

   1 # Process this file with autoconf to produce a configure script, like so:
   2 #
   3 # aclocal -I .. -I ../config && autoconf && autoheader && automake
   4
   5 AC_PREREQ(2.64)
   6 AC_INIT(libssp, 1.0)
   7 AC_CONFIG_SRCDIR(ssp.c)
   8 AC_CANONICAL_SYSTEM
   9 ACX_NONCANONICAL_TARGET
  10
  11 AM_INIT_AUTOMAKE([no-dist])
  12
  13 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  14 AC_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 "$enableval" in
  17  yes) version_specific_libs=yes ;;
  18  no)  version_specific_libs=no ;;
  19  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  20  esac],
  21 [version_specific_libs=no])
  22 AC_MSG_RESULT($version_specific_libs)
  23
  24 AM_MAINTAINER_MODE
  25
  26 GCC_NO_EXECUTABLES
  27
  28 AM_ENABLE_MULTILIB(, ..)
  29
  30 target_alias=${target_alias-$host_alias}
  31 AC_SUBST(target_alias)
  32
  33 AC_CONFIG_HEADERS(config.h)
  34
  35 AC_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
  41 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
  42 m4_define([_AC_ARG_VAR_PRECIOUS],[])
  43 AC_PROG_CC
  44 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
  45
  46 AC_SUBST(CFLAGS)
  47
  48 if test "x$GCC" != "xyes"; then
  49   AC_MSG_ERROR([libssp must be built with GCC])
  50 fi
  51 AC_PROG_CPP
  52
  53 AC_MSG_CHECKING([whether -fstack-protector works])
  54 save_CFLAGS="$CFLAGS"
  55 CFLAGS="$CFLAGS -fstack-protector -Werror"
  56 AC_TRY_COMPILE([
  57 void __attribute__((noinline)) bar (char *x)
  58 {
  59   __builtin_memset (x, 0, 64);
  60 }],[char buf[64]; bar (buf);],
  61 [AC_MSG_RESULT(yes)],
  62 [AC_MSG_RESULT(no)])
  63 CFLAGS="$save_CFLAGS"
  64
  65 AC_MSG_CHECKING([whether hidden visibility is supported])
  66 AC_TRY_COMPILE([
  67 void __attribute__((visibility ("hidden"))) bar (void) {}],,
  68 [ssp_hidden=yes],[ssp_hidden=no])
  69 AC_MSG_RESULT($ssp_hidden)
  70 if test x$ssp_hidden = xyes; then
  71   AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
  72 fi
  73
  74 AC_MSG_CHECKING([whether symbol versioning is supported])
  75 if test x$gcc_no_link = xyes; then
  76   # If we cannot link, we cannot build shared libraries, so do not use
  77   # symbol versioning.
  78   ssp_use_symver=no
  79 else
  80   save_LDFLAGS="$LDFLAGS"
  81   LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
  82   cat > conftest.map <<EOF
  83 FOO_1.0 {
  84   global: *foo*; bar; local: *;
  85 };
  86 EOF
  87   AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
  88   if test x$ssp_use_symver = xno; then
  89     case "$target_os" in
  90       solaris2*)
  91         LDFLAGS="$save_LDFLAGS"
  92         LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
  93         # Sun ld cannot handle wildcards and treats all entries as undefined.
  94         cat > conftest.map <<EOF
  95 FOO_1.0 {
  96   global: foo; local: *;
  97 };
  98 EOF
  99         AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
 100         ;;
 101     esac
 102   fi
 103   LDFLAGS="$save_LDFLAGS"
 104 fi
 105 AC_MSG_RESULT($ssp_use_symver)
 106 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
 107 AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
 108 AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
 109
 110 AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
 111
 112 if test x$gcc_no_link = xyes; then
 113   # Presume the ISO C functions are available; add target-specific
 114   # configuration here if required.
 115   AC_DEFINE(HAVE_STRNCPY)
 116   AC_DEFINE(HAVE_STRNCAT)
 117 else
 118   AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
 119 fi
 120
 121 AC_MSG_CHECKING([whether vsnprintf is usable])
 122 AC_RUN_IFELSE(AC_LANG_PROGRAM([
 123 #include <stdarg.h>
 124 #include <string.h>
 125 #include <stdio.h>
 126 int foo (char *buf, size_t n, const char *fmt, ...)
 127 {
 128   va_list ap;
 129   int ret;
 130   va_start (ap, fmt);
 131   ret = vsnprintf (buf, n, fmt, ap);
 132   va_end (ap);
 133   return ret;
 134 }],
 135 [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
 136  if (foo (buf, 4, ".%s.", "CDEFG") != 7)
 137    return 1;
 138  return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
 139 [ssp_have_usable_vsnprintf=define],
 140 [ssp_have_usable_vsnprintf=undef],
 141 [ssp_have_usable_vsnprintf=undef])
 142 if test "x$ssp_have_usable_vsnprintf" = xdefine; then
 143   AC_MSG_RESULT(yes)
 144   AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
 145 else
 146   AC_MSG_RESULT(no)
 147 fi
 148 AC_SUBST(ssp_have_usable_vsnprintf)
 149
 150 AM_PROG_LIBTOOL
 151 AC_SUBST(enable_shared)
 152 AC_SUBST(enable_static)
 153
 154 # Calculate toolexeclibdir
 155 # Also toolexecdir, though it's only used in toolexeclibdir
 156 case ${version_specific_libs} in
 157   yes)
 158     # Need the gcc compiler version to know where to install libraries
 159     # and header files if --enable-version-specific-runtime-libs option
 160     # is selected.
 161     toolexecdir='$(libdir)/gcc/$(target_alias)'
 162     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
 163     ;;
 164   no)
 165     if test -n "$with_cross_host" &&
 166        test x"$with_cross_host" != x"no"; then
 167       # Install a library built with a cross compiler in tooldir, not libdir.
 168       toolexecdir='$(exec_prefix)/$(target_alias)'
 169       toolexeclibdir='$(toolexecdir)/lib'
 170     else
 171       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
 172       toolexeclibdir='$(libdir)'
 173     fi
 174     multi_os_directory=`$CC -print-multi-os-directory`
 175     case $multi_os_directory in
 176       .) ;; # Avoid trailing /.
 177       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
 178     esac
 179     ;;
 180 esac
 181 AC_SUBST(toolexecdir)
 182 AC_SUBST(toolexeclibdir)
 183
 184 if test ${multilib} = yes; then
 185   multilib_arg="--enable-multilib"
 186 else
 187   multilib_arg=
 188 fi
 189
 190 AC_CONFIG_FILES([Makefile ssp/ssp.h])
 191 AC_OUTPUT