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      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_INIT(libssp, 1.0)
      6 AC_CONFIG_SRCDIR(ssp.c)
      7 AC_CANONICAL_SYSTEM
      8 ACX_NONCANONICAL_TARGET
      9 
     10 AM_INIT_AUTOMAKE([no-dist])
     11 
     12 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
     13 AC_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 "$enableval" in
     16  yes) version_specific_libs=yes ;;
     17  no)  version_specific_libs=no ;;
     18  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
     19  esac],
     20 [version_specific_libs=no])
     21 AC_MSG_RESULT($version_specific_libs)
     22 
     23 AM_MAINTAINER_MODE
     24 
     25 GCC_NO_EXECUTABLES
     26 
     27 AM_ENABLE_MULTILIB(, ..)
     28 
     29 target_alias=${target_alias-$host_alias}
     30 AC_SUBST(target_alias)
     31 
     32 AC_CONFIG_HEADERS(config.h)
     33 
     34 AC_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 
     40 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
     41 m4_define([_AC_ARG_VAR_PRECIOUS],[])
     42 AC_PROG_CC
     43 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
     44 
     45 AC_SUBST(CFLAGS)
     46 
     47 if test "x$GCC" != "xyes"; then
     48   AC_MSG_ERROR([libssp must be built with GCC])
     49 fi
     50 AC_PROG_CPP
     51 
     52 AC_MSG_CHECKING([whether -fstack-protector works])
     53 save_CFLAGS="$CFLAGS"
     54 CFLAGS="$CFLAGS -fstack-protector -Werror"
     55 AC_TRY_COMPILE([
     56 void __attribute__((noinline)) bar (char *x)
     57 {
     58   __builtin_memset (x, 0, 64);
     59 }],[char buf[64]; bar (buf);],
     60 [AC_MSG_RESULT(yes)],
     61 [AC_MSG_RESULT(no)])
     62 CFLAGS="$save_CFLAGS"
     63 
     64 # Add CET specific flags if CET is enabled
     65 GCC_CET_FLAGS(CET_FLAGS)
     66 XCFLAGS="$XCFLAGS $CET_FLAGS"
     67 AC_SUBST(XCFLAGS)
     68 
     69 AC_MSG_CHECKING([whether hidden visibility is supported])
     70 AC_TRY_COMPILE([
     71 void __attribute__((visibility ("hidden"))) bar (void) {}],,
     72 [ssp_hidden=yes],[ssp_hidden=no])
     73 AC_MSG_RESULT($ssp_hidden)
     74 if test x$ssp_hidden = xyes; then
     75   AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
     76 fi
     77 
     78 AC_MSG_CHECKING([whether symbol versioning is supported])
     79 AC_ARG_ENABLE(symvers,
     80 AS_HELP_STRING([--disable-symvers],
     81   [disable symbol versioning for libssp]),
     82 ssp_use_symver=$enableval,
     83 ssp_use_symver=yes)
     84 if 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
     93 FOO_1.0 {
     94   global: *foo*; bar; local: *;
     95 };
     96 EOF
     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
    105 FOO_1.0 {
    106   global: foo; local: *;
    107 };
    108 EOF
    109           AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
    110 	  ;;
    111       esac
    112     fi
    113     LDFLAGS="$save_LDFLAGS"
    114   fi
    115 fi
    116 AC_MSG_RESULT($ssp_use_symver)
    117 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])
    118 AM_CONDITIONAL(LIBSSP_USE_SYMVER_GNU, [test "x$ssp_use_symver" = xgnu])
    119 AM_CONDITIONAL(LIBSSP_USE_SYMVER_SUN, [test "x$ssp_use_symver" = xsun])
    120 
    121 AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
    122 
    123 if test x$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)
    128 else
    129   AC_CHECK_FUNCS(memmove mempcpy strncpy strncat)
    130 fi
    131 AC_CHECK_DECLS([gets])
    132 
    133 AC_MSG_CHECKING([whether vsnprintf is usable])
    134 AC_RUN_IFELSE([AC_LANG_PROGRAM([
    135 #include <stdarg.h>
    136 #include <string.h>
    137 #include <stdio.h>
    138 int 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])
    154 if test "x$ssp_have_usable_vsnprintf" = xdefine; then
    155   AC_MSG_RESULT(yes)
    156   AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
    157 else
    158   AC_MSG_RESULT(no)
    159 fi
    160 AC_SUBST(ssp_have_usable_vsnprintf)
    161 
    162 AM_PROG_LIBTOOL
    163 ACX_LT_HOST_FLAGS
    164 AC_SUBST(enable_shared)
    165 AC_SUBST(enable_static)
    166 
    167 GCC_WITH_TOOLEXECLIBDIR
    168 
    169 AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
    170 
    171 # Calculate toolexeclibdir
    172 # Also toolexecdir, though it's only used in toolexeclibdir
    173 case ${version_specific_libs} in
    174   yes)
    175     # Need the gcc compiler version to know where to install libraries
    176     # and header files if --enable-version-specific-runtime-libs option
    177     # is selected.
    178     toolexecdir='$(libdir)/gcc/$(target_alias)'
    179     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
    180     ;;
    181   no)
    182     if test -n "$with_cross_host" &&
    183        test x"$with_cross_host" != x"no"; then
    184       # Install a library built with a cross compiler in tooldir, not libdir.
    185       toolexecdir='$(exec_prefix)/$(target_alias)'
    186       case ${with_toolexeclibdir} in
    187 	no)
    188 	  toolexeclibdir='$(toolexecdir)/lib'
    189 	  ;;
    190 	*)
    191 	  toolexeclibdir=${with_toolexeclibdir}
    192 	  ;;
    193       esac
    194     else
    195       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
    196       toolexeclibdir='$(libdir)'
    197     fi
    198     multi_os_directory=`$CC -print-multi-os-directory`
    199     case $multi_os_directory in
    200       .) ;; # Avoid trailing /.
    201       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
    202     esac
    203     ;;
    204 esac
    205 AC_SUBST(toolexecdir)
    206 AC_SUBST(toolexeclibdir)
    207 
    208 if test ${multilib} = yes; then
    209   multilib_arg="--enable-multilib"
    210 else
    211   multilib_arg=
    212 fi
    213 
    214 # Determine what GCC version number to use in filesystem paths.
    215 GCC_BASE_VER
    216 
    217 AC_CONFIG_FILES([Makefile ssp/ssp.h])
    218 AC_OUTPUT
    219