Wed Apr 16 16:55:36 1997 Marcus G. Daniels <marcus@cathcart.sysc.pdx.edu>

	* configure.in: Replace AC_PROG_CC with AC_PROG_CC_LOCAL.
	If cross compiling do Lex/Yacc checks with BUILD_CC.
        Check CC and BUILD_CC for libraries having the needed support,
	and substitute discovery in installed_clib.

	* aclocal.m4: New file.  These replacement macros are to handle
	the case where there is a cross compiler but no supporting files.

	* Makefile.in (installed-clib): Don't hardwire a Hurd libcrt.a.
	(cross_linkable): Only define cross-migcom variable when it will
	be possible to build it.
	(all, install): Use $(cross-migcom).
	(install): Install cross-migcom only if was to be built.
	(mkinstalldirs): Add $(bindir), $(includedir)/mach/exec
	(cross-lexxer.o lexxer.o): lexxer.o needs cpu.h.
	(./cross-migcom): Prevent dependency generation for cross-* MiG files
	unless they can actually be built.

1 files changed, 43 insertions, 4 deletions

diff --git a/configure.in b/configure.in
index 50aabe4..1683d3f 100644
--- a/configure.in
+++ b/configure.in
@@ -39,16 +39,55 @@ AC_PREFIX_DEFAULT()
 #
 # Programs
 #
-AC_PROG_CC
+AC_PROG_CC_LOCAL
 AC_PROG_AWK
 AC_PROG_INSTALL
-AC_PROG_LEX
-AC_PROG_YACC
 AC_CHECK_TOOL(MIG, mig, mig)
 
-if test $host != $build; then
+if test $cross_compiling = yes; then
   AC_CHECK_PROG(BUILD_CC, gcc cc)
+  CC=$BUILD_CC
+fi
+
+AC_PROG_LEX
+AC_PROG_YACC
+
+if test $cross_compiling = yes ; then
+  CC=$ac_cv_prog_CC
+fi
+
+
+usable_libc='yes'
+needed_funcs='memcpy memset bcopy bzero htonl ntohl ntohs'
+AC_CHECK_FUNCS($needed_funcs, , usable_libc=no)
+if test $usable_libc = no ; then
+  echo "Support functions not found using $CC, trying $BUILD_CC."
+  CC="$BUILD_CC"
+  for i in $needed_funcs ; do
+    unset ac_cv_func_$i
+  done
+  usable_libc=yes
+  AC_CHECK_FUNCS($needed_funcs, , usable_libc=no)
+  if test $usable_libc = no ; then
+    echo "Configuration problem:" 1>&2
+    echo "Please set installed-clib in the toplevel Makefile so the functions:"
+    echo "$needed_funcs are available."
+    exit 1
+  else
+    changequote(,)
+    set -- `$BUILD_CC -v 2>&1 | sed -n 's/.*from \(.*\)\/lib\/gcc-lib\/\([^/][^/]*\).*/\1 \2/p'`
+    changequote([,])
+    if test -f "$1/$2/lib/libc.a" ; then
+      installed_clib=$1/$2/lib/libc.a
+    else
+      installed_clib=$1/lib/libc.a
+    fi
+  fi
+  CC=$ac_cv_prog_CC
+else
+  installed_clib=$prefix/lib/libcrt.a
 fi
+AC_SUBST(installed_clib)
 
 # Set up `machine' link in build directory for easier header file location.
 AC_LINK_FILES(${systype}/${systype},machine)