Big patch form Ralf Corsepius described in this email:

  Here is the result of my nightly work to get RTEMS_ROOT=$srcdir working
  with different shells and relative/absolute paths.

  What I did is relatively simple in principle:
  Instead of setting RTEMS_ROOT in configure.in and then let configure
  substitute @RTEMS_ROOT@ inside the Makefiles, I now let each Makefile
  set RTEMS_ROOT from each Makefile's @top_srcdir@ value.

  The difference is subtile, but with enormous side effects:
  - If RTEMS_ROOT is set in configure, then the same single value will be
  propagated to all Makefiles. This breaks using relative paths, as the
  relative path to the root of the source tree is used inside of all
  subdirectory Makefiles.
  - Now each Makefile.in sets RTEMS_ROOT = @top_srcdir@.  top_srcdir  is
  computed individually by configure for each single Makefile.in, hereby
  receiving the correct value, no matter if relative or absolute paths are
  used.

  To get this working, I needed to remove setting RTEMS_ROOT from
  target.cfg.in, because this overrides the value of RTEMS_ROOT from each
  individual Makefile.


  Furthermore, I removed RTEMS_CUSTOM from the Makefiles and replaced all
  "include $(RTEMS_CUSTOM)" directives with"include
  $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP)". Perhaps you don't like this,
  but I think, to have one variable less is clearer and easier to
  understand than having several variables refering to the next one.


  I enclose a small patch to this mail, which
  - fixes the config.h problem (to finally clearify misunderstands)
  - removes assignment/subsitution of RTEMS_ROOT from configure.in
  - contains a workaround for the application Makefile's RTEMS_ROOT
  problem (reported by Eric)
  - removes some unused lines from the toplevel Makefile.in
  - removes assignment of RTEMS_ROOT from make/target.cfg.in

8 files changed, 16 insertions, 32 deletions

diff --git a/c/src/lib/libbsp/m68k/mvme136/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/Makefile.in
index 0e705b50ab..7a8d6260ed 100644
--- a/c/src/lib/libbsp/m68k/mvme136/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/Makefile.in
@@ -4,13 +4,11 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/directory.cfg
 
 # wrapup is the one that actually builds and installs the library
diff --git a/c/src/lib/libbsp/m68k/mvme136/clock/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/clock/Makefile.in
index 0e980c84a5..d882f1d00f 100644
--- a/c/src/lib/libbsp/m68k/mvme136/clock/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/clock/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 PGM=${ARCH}/clock.rel
 
@@ -22,7 +20,7 @@ H_FILES=
 SRCS=$(C_FILES) $(H_FILES)
 OBJS=$(C_O_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 
diff --git a/c/src/lib/libbsp/m68k/mvme136/console/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/console/Makefile.in
index 580c9e9c7d..fd05ddfedd 100644
--- a/c/src/lib/libbsp/m68k/mvme136/console/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/console/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 PGM=${ARCH}/console.rel
 
@@ -22,7 +20,7 @@ H_FILES=
 SRCS=$(C_FILES) $(H_FILES)
 OBJS=$(C_O_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 #
diff --git a/c/src/lib/libbsp/m68k/mvme136/include/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/include/Makefile.in
index 83a810f42b..7d8581095f 100644
--- a/c/src/lib/libbsp/m68k/mvme136/include/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/include/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 H_FILES = $(srcdir)/bsp.h $(srcdir)/coverhd.h
 
@@ -24,7 +22,7 @@ EQ_FILES =
 
 SRCS=$(H_FILES) $(EQ_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 CLEAN_ADDITIONS +=
diff --git a/c/src/lib/libbsp/m68k/mvme136/shmsupp/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/shmsupp/Makefile.in
index 71f9604301..031a0aa0cd 100644
--- a/c/src/lib/libbsp/m68k/mvme136/shmsupp/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/shmsupp/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 PGM=${ARCH}/shmsupp.rel
 
@@ -22,7 +20,7 @@ H_FILES=
 SRCS=$(C_FILES) $(H_FILES)
 OBJS=$(C_O_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 #
diff --git a/c/src/lib/libbsp/m68k/mvme136/startup/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/startup/Makefile.in
index 883e0b7a95..6937330b60 100644
--- a/c/src/lib/libbsp/m68k/mvme136/startup/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/startup/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@:@srcdir@/../../shared:@srcdir@/../../../shared
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 PGM=${ARCH}/startup.rel
 
@@ -22,7 +20,7 @@ H_FILES=
 SRCS=$(srcdir)/linkcmds $(C_FILES) $(H_FILES)
 OBJS=$(C_O_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 #
diff --git a/c/src/lib/libbsp/m68k/mvme136/timer/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/timer/Makefile.in
index 62d7c793d5..24809cbed8 100644
--- a/c/src/lib/libbsp/m68k/mvme136/timer/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/timer/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 PGM=${ARCH}/timer.rel
 
@@ -27,7 +25,7 @@ S_O_FILES=$(S_FILES:%.s=${ARCH}/%.o)
 SRCS=$(C_FILES) $(H_FILES) $(S_FILES)
 OBJS=$(C_O_FILES) $(S_O_FILES)
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/leaf.cfg
 
 #
diff --git a/c/src/lib/libbsp/m68k/mvme136/wrapup/Makefile.in b/c/src/lib/libbsp/m68k/mvme136/wrapup/Makefile.in
index 2ab7a96f34..4dc4ea5208 100644
--- a/c/src/lib/libbsp/m68k/mvme136/wrapup/Makefile.in
+++ b/c/src/lib/libbsp/m68k/mvme136/wrapup/Makefile.in
@@ -4,11 +4,9 @@
 
 @SET_MAKE@
 srcdir = @srcdir@
-top_srcdir = @top_srcdir@
 VPATH = @srcdir@
-RTEMS_ROOT = @RTEMS_ROOT@
+RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
-RTEMS_CUSTOM = $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 
 BSP_PIECES=startup clock console shmsupp timer
 GENERIC_PIECES=shmdr
@@ -18,7 +16,7 @@ OBJS=$(foreach piece, $(BSP_PIECES), ../$(piece)/$(ARCH)/$(piece).rel) \
      $(foreach piece, $(GENERIC_PIECES), ../../../$(piece)/$(ARCH)/$(piece).rel)
 LIB=$(ARCH)/libbsp.a
 
-include $(RTEMS_CUSTOM)
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
 include $(RTEMS_ROOT)/make/lib.cfg
 
 #