Merge branch 'dfsg-orig'

[debian/gnuradio] / gr-howto-write-a-block / config / gr_lib64.m4

diff --git a/gr-howto-write-a-block/config/gr_lib64.m4 b/gr-howto-write-a-block/config/gr_lib64.m4
new file mode 100644 (file)
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+++ b/gr-howto-write-a-block/config/gr_lib64.m4
@@ -0,0 +1,85 @@
+dnl
+dnl Copyright 2005,2008 Free Software Foundation, Inc.
+dnl 
+dnl This file is part of GNU Radio
+dnl 
+dnl GNU Radio is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3, or (at your option)
+dnl any later version.
+dnl 
+dnl GNU Radio is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl 
+dnl You should have received a copy of the GNU General Public License
+dnl along with GNU Radio; see the file COPYING.  If not, write to
+dnl the Free Software Foundation, Inc., 51 Franklin Street,
+dnl Boston, MA 02110-1301, USA.
+dnl 
+
+dnl GR_LIB64()
+dnl
+dnl Checks to see if we're on a x86_64 or powerpc64 machine, and if so, determine
+dnl if libdir should end in "64" or not.
+dnl
+dnl Sets gr_libdir_suffix to "" or "64" and calls AC_SUBST(gr_libdir_suffix)
+dnl May append "64" to libdir.
+dnl
+dnl The current heuristic is:
+dnl   if the host_cpu isn't x86_64 or powerpc64, then ""
+dnl   if the host_os isn't linux, then ""
+dnl   if we're cross-compiling, ask the linker, by way of the selected compiler
+dnl   if we're x86_64 and there's a /lib64 and it's not a symlink, then "64", else ""
+dnl   else ask the compiler
+dnl
+AC_DEFUN([GR_LIB64],[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AC_PROG_CXX])
+
+  AC_MSG_CHECKING([gr_libdir_suffix])
+  gr_libdir_suffix=""
+  AC_SUBST(gr_libdir_suffix)
+
+  case "$host_os" in
+    linux*) is_linux=yes ;;
+    *)      is_linux=no  ;;
+  esac
+
+  if test "$is_linux" = no || test "$host_cpu" != "x86_64" && test "$host_cpu" != "powerpc64"; then
+    gr_libdir_suffix=""
+  elif test "$cross_compiling" = yes; then
+    _GR_LIB64_ASK_COMPILER
+  elif test "$host_cpu" = "x86_64"; then
+    if test -d /lib64 && test ! -L /lib64; then
+      gr_libdir_suffix=64
+    fi
+  else
+    _GR_LIB64_ASK_COMPILER  
+  fi
+  AC_MSG_RESULT([$gr_libdir_suffix])
+
+
+  AC_MSG_CHECKING([whether to append 64 to libdir])
+  t=${libdir##*/lib}
+  if test "$t" != 64 && test "$gr_libdir_suffix" = "64"; then
+    libdir=${libdir}64
+    AC_MSG_RESULT([yes. Setting libdir to $libdir])
+  else
+    AC_MSG_RESULT([no])
+  fi
+])
+
+dnl If we're using g++, extract the first SEARCH_DIR("...") entry from the linker script
+dnl and see if it contains a suffix after the final .../lib part of the path.
+dnl (This works because the linker script varies depending on whether we're generating
+dnl 32-bit or 64-bit executables)
+dnl
+AC_DEFUN([_GR_LIB64_ASK_COMPILER],[
+  if test "$ac_cv_cxx_compiler_gnu" = "yes";
+  then
+    gr_libdir_suffix=`$CXX -Wl,--verbose 2>/dev/null | sed -n -e '/SEARCH_DIR/{s/;.*$//; s,^.*/,,; s/".*$//; s/^lib//; p}'`
+  fi
+])
+