Patch from Ralf Corsepius <corsepiu@faw.uni-ulm.de>:

The patch below actuallly consists of two patches:
1) moving librpc to c/src/librpc similar to what has been done to librtems++
2) reworked configure scripts, many safety and dependency checks added to
aclocal/*.m4 macros + configuration fixes.

To apply:

mkdir c/src/librpc
mkdir c/src/librpc/src
cp c/src/lib/librpc/*.c c/src/librpc/src
cp c/src/lib/librpc/Makefile.in c/src/librpc/src
mkdir c/src/librpc/include
mkdir c/src/librpc/include/rpc
cp c/src/lib/include/rpc/* c/src/librpc/include/rpc
patch -p1 < ../rtems-rc-19990820-7.diff
rm -rf c/src/lib/librpc
rm -rf c/src/lib/include/rpc
./autogen

The additional checks in aclocal/*m4 macros add rather restrictive, sometimes
unnecessarily restrictive constraints on the sequence of how macros can be
used in a configure.in script. Adding them has let my problems with some more
complicated configuration options vanish. Apparently some macros had not been
in the required order .

----

Now I still get some linking errors for some cpus and bsps, esp when linking
cdtest, but also at other locations:

e.g. this happens for mips64orion/p4600:

# make[5]: Entering directory
`/lfs/poseidon/users/rtems/src/multi/build/mips64orion-rtems/c/p4600/tests/samples/hello'

/opt/rtems/bin/mips64orion-rtems-gcc --pipe -B../../../../../../p4600/lib/
-specs bsp_specs -qrtems -DP4000 -DCPU_R4000 -DP3_DIAG -D_R4000 -D__mips=3
-mcpu=4600 -G0   -I../../../../../../p4600/lib/include/networking  -g -Wall
-ansi -fasm  -O4 -fomit-frame-pointer     -o o-p4600/hello.exe
o-p4600/init.o ../../../../../../p4600/lib/no-dpmem.rel
../../../../../../p4600/lib/no-event.rel
../../../../../../p4600/lib/no-msg.rel ../../../../../../p4600/lib/no-mp.rel
../../../../../../p4600/lib/no-part.rel
../../../../../../p4600/lib/no-signal.rel
../../../../../../p4600/lib/no-timer.rel
../../../../../../p4600/lib/no-rtmon.rel
/opt/rtems/mips64orion-rtems/lib/libc.a(dtoa.o): In function `_dtoa_r':
/opt/hermes/embedded/build/build-mips64orion-tools/mips64orion-rtems/newlib/libc/stdlib/../../../../../src/newlib/libc/stdlib/dtoa.c:348: relocation truncated to fit: R_MIPS_LITERAL no symbol
/opt/hermes/embedded/build/build-mips64orion-tools/mips64orion-rtems/newlib/libc/stdlib/../../../../../src/newlib/libc/stdlib/dtoa.c:348: relocation truncated to fit: R_MIPS_LITERAL no symbol
/opt/hermes/embedded/build/build-mips64orion-tools/mips64orion-rtems/newlib/libc/stdlib/../../../../../src/newlib/libc/stdlib/dtoa.c:348: relocation truncated to fit: R_MIPS_LITERAL no symbol
collect2: ld returned 1 exit status

# mips64orion-rtems-gcc -v
Reading specs from /opt/rtems/lib/gcc-lib/mips64orion-rtems/2.95.1/specs
gcc version 2.95.1 19990816 (release)

# mips64orion-rtems-ld -v
GNU ld version 2.9.5 (with BFD 2.9.5)

aclocal/check-bsps.m4

@@ -39,6 +39,8 @@ AC_MSG_RESULT([[$]$1 .. done])
 
 AC_DEFUN(RTEMS_CHECK_CUSTOM_BSP,
 [dnl
+AC_REQUIRE([RTEMS_TOP])
+
 AC_MSG_CHECKING([for make/custom/[$]$1.cfg])
 if test -r "$srcdir/$RTEMS_TOPdir/make/custom/[$]$1.cfg"; then
   AC_MSG_RESULT([yes])

aclocal/check-cpu.m4

@@ -5,6 +5,8 @@ AC_DEFUN(RTEMS_CHECK_CPU,
 [dnl
 AC_REQUIRE([RTEMS_TOP])
 AC_REQUIRE([RTEMS_CANONICAL_TARGET_CPU])
+AC_BEFORE([$0], [RTEMS_CHECK_POSIX_API])dnl
+
 # Is this a supported CPU?
 AC_MSG_CHECKING([if cpu $RTEMS_CPU is supported])
 if test -d "$srcdir/$RTEMS_TOPdir/c/src/exec/score/cpu/$RTEMS_CPU"; then

aclocal/check-multiprocessing.m4

@@ -6,6 +6,8 @@ AC_DEFUN(RTEMS_CHECK_MULTIPROCESSING,
 [dnl
 AC_REQUIRE([RTEMS_TOP])dnl
 AC_REQUIRE([RTEMS_CHECK_CPU])dnl
+AC_REQUIRE([RTEMS_ENABLE_MULTIPROCESSING])dnl
+
 AC_CACHE_CHECK([whether BSP supports multiprocessing],
   rtems_cv_HAS_MP,
   [dnl

aclocal/check-networking.m4

@@ -3,6 +3,9 @@ dnl
 AC_DEFUN(RTEMS_CHECK_NETWORKING,
 [dnl
 AC_REQUIRE([RTEMS_CHECK_CPU])dnl
+AC_REQUIRE([RTEMS_ENABLE_NETWORKING])dnl
+AC_BEFORE([$0], [RTEMS_CHECK_RDBG])dnl
+
 AC_CACHE_CHECK([whether BSP supports networking],
   rtems_cv_HAS_NETWORKING,
   [dnl

aclocal/check-posix.m4

@@ -3,6 +3,8 @@ dnl
 AC_DEFUN(RTEMS_CHECK_POSIX_API,
 [dnl
 AC_REQUIRE([RTEMS_CHECK_CPU])dnl
+AC_REQUIRE([RTEMS_ENABLE_POSIX])dnl
+
 AC_CACHE_CHECK([whether BSP supports libposix],
   rtems_cv_HAS_POSIX_API,
   [dnl

aclocal/check-rdbg.m4

@@ -4,6 +4,8 @@ AC_DEFUN(RTEMS_CHECK_RDBG,
 [dnl
 AC_REQUIRE([RTEMS_TOP])dnl
 AC_REQUIRE([RTEMS_CHECK_CPU])dnl
+AC_REQUIRE([RTEMS_CHECK_NETWORKING])dnl
+AC_REQUIRE([RTEMS_ENABLE_RDBG])dnl
 AC_CACHE_CHECK([whether BSP supports librdbg],
   rtems_cv_HAS_RDBG,
   [

aclocal/enable-networking.m4

@@ -2,6 +2,8 @@ dnl $Id$
 
 AC_DEFUN(RTEMS_ENABLE_NETWORKING,
 [
+AC_BEFORE([$0], [RTEMS_CHECK_NETWORKING])dnl
+
 AC_ARG_ENABLE(networking,
 [  --enable-networking                  enable TCP/IP stack],
 [case "${enableval}" in

aclocal/enable-posix.m4

@@ -2,6 +2,8 @@ dnl $Id$
 
 AC_DEFUN(RTEMS_ENABLE_POSIX,
 [
+AC_BEFORE([$0], [RTEMS_CHECK_POSIX_API])dnl
+
 AC_ARG_ENABLE(posix,
 [  --enable-posix                       enable posix interface],
 [case "${enableval}" in 

aclocal/enable-rdbg.m4

@@ -2,6 +2,8 @@ dnl $Id$
 
 AC_DEFUN(RTEMS_ENABLE_RDBG,
 [
+AC_BEFORE([$0], [RTEMS_CHECK_RDBG])dnl
+
 AC_ARG_ENABLE(rdbg,
 [  --enable-rdbg                        enable remote debugger],
 [case "${enableval}" in

aclocal/enable-rtemsbsp.m4

@@ -5,6 +5,7 @@ dnl used by the toplevel configure script
 dnl RTEMS_ENABLE_RTEMSBSP(rtems_bsp_list)
 AC_DEFUN(RTEMS_ENABLE_RTEMSBSP,
 [
+AC_BEFORE([$0], [RTEMS_ENV_RTEMSBSP])dnl
 AC_ARG_ENABLE(rtemsbsp,
 [  --enable-rtemsbsp=bsp1 bsp2 ..      BSPs to include in build],
 [case "${enableval}" in
@@ -17,6 +18,12 @@ dnl Pass a single BSP via an environment variable
 dnl used by per BSP configure scripts
 AC_DEFUN(RTEMS_ENV_RTEMSBSP,
 [dnl
+AC_BEFORE([$0], [RTEMS_ENABLE_RTEMSBSP])dnl
+AC_BEFORE([$0], [RTEMS_PROJECT_ROOT])dnl
+AC_BEFORE([$0], [RTEMS_CHECK_CUSTOM_BSP])dnl
+AC_BEFORE([$0], [RTEMS_CHECK_MULTIPROCESSING])dnl
+AC_BEFORE([$0], [RTEMS_CHECK_POSIX_API])dnl
+
 AC_MSG_CHECKING([for RTEMS_BSP])
 AC_CACHE_VAL(rtems_cv_RTEMS_BSP,
 [dnl

aclocal/gcc-specs.m4

@@ -3,8 +3,6 @@ dnl $Id$
 dnl
 dnl Check whether the target compiler accepts -specs
 dnl
-dnl 98/02/11 Ralf Corsepius 	corsepiu@faw.uni-ulm.de
-dnl
 
 AC_DEFUN(RTEMS_GCC_SPECS,
 [AC_REQUIRE([RTEMS_PROG_CC])

aclocal/prog-cc.m4

@@ -10,6 +10,7 @@ AC_DEFUN(RTEMS_PROG_CC,
 [
 AC_BEFORE([$0], [AC_PROG_CPP])dnl
 AC_BEFORE([$0], [AC_PROG_CC])dnl
+AC_BEFORE([$0], [RTEMS_CANONICALIZE_TOOLS])dnl
 AC_REQUIRE([RTEMS_TOOL_PREFIX])dnl
 
 dnl Only accept gcc and cc

aclocal/prog-cxx.m4

@@ -10,6 +10,7 @@ AC_DEFUN(RTEMS_PROG_CXX,
 [
 AC_BEFORE([$0], [AC_PROG_CXXCPP])dnl
 AC_BEFORE([$0], [AC_PROG_CXX])dnl
+AC_BEFORE([$0], [RTEMS_CANONICALIZE_TOOLS])dnl
 AC_REQUIRE([RTEMS_TOOL_PREFIX])dnl
 
 dnl Only accept g++ and c++

aclocal/rtems-top.m4

@@ -7,6 +7,9 @@ dnl $1 .. relative path from this configure.in to the toplevel configure.in
 dnl
 AC_DEFUN(RTEMS_TOP,
 [dnl
+AC_BEFORE([$0], [AC_CONFIG_AUX_DIR])dnl
+AC_BEFORE([$0], [AM_INIT_AUTOMAKE])dnl
+
 AC_ARG_WITH(target-subdir,
 [  --with-target-subdir=DIR],
 TARGET_SUBDIR="$withval",