make target selection fully configurable
This commit is contained in:
David MacKenzie
parent
379dd96582
commit
5f9a2245d8
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@ -1,3 +1,34 @@
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Sat Aug 7 09:14:21 1993 David J. Mackenzie (djm@thepub.cygnus.com)
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* PORTING, TODO, config/README: Update to reflect below changes.
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* configure.in: Replace MINIMIZE and --with-minimal-bfd with
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--with-bfd-targets="target1,target2,..." and the special target
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"all" to get the previous default behavior.
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Figure out which architecture and backend .o files are needed from
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DEFAULT_VECTOR, SELECT_VECS, and SELECT_ARCHITECTURES as set in
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the .mt files. Define TDEFAULTS based on them, also.
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* Makefile.in: Remove references to MINIMIZE.
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* archures.c, targets.c: Ditto.
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* config/*.mt: Define DEFAULT_VECTOR, SELECT_VECS, and
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SELECT_ARCHITECTURES as variables rather than as -D arguments to
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TDEFAULTS.
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* config/a29k-coff.mt,alphaosf.mt, i386-sco.mt, i960-bout.mt,
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i960-coff.mt (TDEFAULTS): Don't put the default vector in
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SELECT_VECS manually; it's automatic now.
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* config/i386-sco.mt (TDEFAULTS): Don't put &sco_core_vec in
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SELECT_VECS manually; -DSCO_CORE does it automatically now.
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* config/h8300-coff.mt,h8500-coff.mt,sh-coff.mt,st2000.mt,z8k-coff.mt
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(TDEFAULTS): Don't define BFD; not used.
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* config/hppaosf.mh (HDEFINES): Don't define SELECT_ARCHITECTURES;
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this is a host, not a target.
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Sat Aug 7 05:28:03 1993 Fred Fish (fnf@deneb.cygnus.com)
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* elfcode.h (elf_object_p): Add comment about what this function
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@ -23,7 +54,7 @@ Fri Aug 6 12:00:03 1993 David J. Mackenzie (djm@thepub.cygnus.com)
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* config/i386isc.mh (ALLOCA),
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* config/go32.mh (EXTRALIBS): Don't define; not used.
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* config/solaris2.mh (HDEFINES): Renamed from H_DEFINES.
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* config/alphaosf.mt (TDEFINES): alphaosf.mt: Set it, not HDEFINES.
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* config/alphaosf.mt (TDEFINES): Set it, not HDEFINES.
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* config/z8k-coff.mt (CC): Don't define. It's a target, not a host.
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* config/.Sanitize (Things-to-keep): Add README.
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@ -107,9 +107,6 @@ OPTIONAL_BACKENDS = trad-core.o sco-core.o aix386-core.o hpux-core.o
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# These are defined by configure.in:
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# WORDSIZE=32
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# BFD_BACKENDS = $(BFD32_BACKENDS)
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# Change this (to MINIMIZE=1) to save space in executables.
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# Currently, all this does is control the target_vector in targets.c.
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# MINIMIZE=0
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all:
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@ -177,9 +174,8 @@ install-info: force
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# Various kinds of .o files to put in libbfd.a:
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# BFD_LIBS Generic routines, always needed.
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# BFD_BACKENDS Routines the target needs if it is the configured target.
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# BFD_MACHINES Architecture-specific routines in cpu-*.o.
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# Always set to ALL_MACHINES for now.
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# BFD_BACKENDS Routines the configured targets need.
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# BFD_MACHINES Architecture-specific routines the configured targets need.
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# HDEPFILES Routines the host needs, regardless of target.
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# TDEPFILES Routines the target needs, regardless of host.
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OFILES = $(BFD_LIBS) $(BFD_BACKENDS) $(BFD_MACHINES) $(HDEPFILES) $(TDEPFILES)
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@ -206,10 +202,10 @@ $(TARGETLIB): $(OFILES) ofiles
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targets.o: targets.c Makefile
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$(CC) -c $(CFLAGS) $(HDEFINES) $(TDEFINES) $(CSEARCH) $(CSWITCHES) -DMINIMIZE=$(MINIMIZE) $(TDEFAULTS) $<
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$(CC) -c $(CFLAGS) $(HDEFINES) $(TDEFINES) $(CSEARCH) $(CSWITCHES) $(TDEFAULTS) $<
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archures.o: archures.c Makefile
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$(CC) -c $(CFLAGS) $(HDEFINES) $(TDEFINES) $(CSEARCH) $(CSWITCHES) -DMINIMIZE=$(MINIMIZE) $(TDEFAULTS) $<
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$(CC) -c $(CFLAGS) $(HDEFINES) $(TDEFINES) $(CSEARCH) $(CSWITCHES) $(TDEFAULTS) $<
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subdir_do: force
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@for i in $(DODIRS); do \
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@ -0,0 +1,73 @@
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Preliminary Notes on Porting BFD
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--------------------------------
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The 'host' is the system a tool runs *on*.
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The 'target' is the system a tool runs *for*, i.e.
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a tool can read/write the binaries of the target.
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Porting to a new host
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---------------------
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Pick a name for your host. Call that <host>.
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(<host> might be sun4, ...)
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Create a file hosts/h-<host>.
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Porting to a new target
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-----------------------
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Pick a name for your target. Call that <target>.
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You need to create <target>.c and config/mt-<target>.
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config/mt-<target> is a Makefile fragment.
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The following is usually enough:
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DEFAULT_VECTOR=<target>_vec
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SELECT_ARCHITECTURES=bfd_<cpu>_arch
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See the list of cpu types in archures.c, or "ls cpu-*.c".
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The file <target>.c is the hard part. It implements the
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bfd_target <target>_vec, which includes pointers to
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functions that do the actual <target>-specific methods.
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Porting to a <target> that uses the a.out binary format
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-------------------------------------------------------
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In this case, the include file aout-target.h probaby does most
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of what you need. The program gen-aout generates <target>.c for
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you automatically for many a.out systems. Do:
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make gen-aout
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./gen-aout <target> > <target>.c
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(This only works if you are building on the target ("native").
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If you must make a cross-port from scratch, copy the most
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similar existing file that includes aout-target.h, and fix what is wrong.)
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Check the parameters in <target>.c, and fix anything that is wrong.
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(Also let us know about it; perhaps we can improve gen-aout.c.)
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TARGET_IS_BIG_ENDIAN_P
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Should be defined if <target> is big-endian.
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N_HEADER_IN_TEXT(x)
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See discussion in ../include/aout/aout32.h.
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BYTES_IN_WORD
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Number of bytes per word. (Usually 4 but can be 8.)
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ARCH
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Number of bits per word. (Usually 32, but can be 64.)
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ENTRY_CAN_BE_ZERO
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Define if the extry point (start address of an
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executable program) can be 0x0.
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TEXT_START_ADDR
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The address of the start of the text segemnt in
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virtual memory. Normally, the same as the entry point.
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PAGE_SIZE
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SEGMENT_SIZE
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Usually, the same as the PAGE_SIZE.
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Alignment needed for the data segment.
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TARGETNAME
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The name of the target, for run-time lookups.
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Usually "a.out-<target>"
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48
bfd/TODO
48
bfd/TODO
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@ -1,41 +1,25 @@
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Things that still need to be handled: -*- Text -*-
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Things that still need to be done: -*- Text -*-
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o - A source of space lossage is that all the target-dependent
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code is in a single bfd_target structure. Hence all the code
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for *writing* object files is still pulled into all the applications
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that only care about *reading* (gdb, nm, objdump), while gas
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has to carry along all the unneded baggage for reading objects.
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And so one. This would be a much more substantial change,
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and the payoff would be less (essentially none if bfd is
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used as a shared library).
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o - The storage needed by BFD data structures is also larger than strictly
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needed. This may be difficult to do much about.
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o - change the memory usage to reflect the message which follows the
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page break.
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o - implement bfd_abort, which should close the bfd but not alter the
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filesystem.
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o - update the bfd doc; write a how-to-write-a-backend doc.
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o - change reloc handling as per Steve's suggestion.
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(more details please.....)
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Changing the way bfd uses memory. The new convention is simple:
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o - bfd will never write into user-supplied memory, nor attempt to
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free it.
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o - closing a bfd may reclaim all bfd-allocated memory associated
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with that bfd.
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- - bfd_target_list will be the one exception; you must reclaim the
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returned vector yourself.
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o - update the bfd doc; write a how-to-write-a-backend doc, take out
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the stupid quips and fill in all the blanks.
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Interface implications are minor (get_symcount_upper_bound will go
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away; bfd_cannicalize_symtab will allocate its own memory, etc).
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o - upgrade the reloc handling as per Steve's suggestion.
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Certain operations consume a lot of memory; for them manual
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reclaimation is available:
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o - bfd_canonicalize_symtab will return a pointer to a
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null-terminated vector of symbols. Subsequent calls may or may
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not return the same pointer.
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bfd_canonicalize_relocs will do the same; returning a pointer to
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an array of arelocs. Calling this function will read symbols in
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too.
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o - bfd_reclaim_relocs will free the memory used by these relocs.
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the symbols will be untouched.
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bfd_reclaim_symtab (ne bfd_reclaim_symbol_table) will free the
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memory allocated by canonialize_symtab.
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Since relocations point to symbols, any relocations obtained by a
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call to bfd_canonicalize_relocs will be reclaimed as well.
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o - if you don't call the reclaim_ functions, the memory will be
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reclaimed at bfd_close time.
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167
bfd/configure.in
167
bfd/configure.in
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@ -31,6 +31,11 @@ fi
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# per-target:
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if [ "x$target" = "xall" ]; then
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echo "*** 'all' can not be the default target" 1>&2
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exit 1
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fi
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# WHEN ADDING ENTRIES TO THIS MATRIX:
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# Make sure that the left side always has two dashes. Otherwise you
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# can get spurious matches. Even for unambiguous cases, do this as a
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@ -60,6 +65,7 @@ case "${target}" in
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i[34]86-*-elf) bfd_target=i386-elf ;;
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i[34]86-*-netware*) bfd_target=i386-nlm ;;
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i[34]86-*-linux*) bfd_target=i386-linux ;;
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i[34]86-*-lynx*) bfd_target=i386-lynx ;;
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i[34]86-none-*) bfd_target=i386-coff ;;
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i960-*-vxworks) bfd_target=i960-bout ;;
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i960-*-aout) bfd_target=i960-bout ;;
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@ -89,7 +95,10 @@ case "${target}" in
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sparc-*-solaris2*) bfd_target=sparc-elf ;;
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sparc-*-sysv4*) bfd_target=sparc-elf ;;
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# start-sanitize-v9
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sparc64-*-aout*) bfd_target=sparc-aout ; target64=true ;;
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# Don't set target64=true for sparc64-*-aout*. Keep it using the 32bit stuff
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# so we continue to have something that works (until the 64 bit support is
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# rock solid).
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sparc64-*-aout*) bfd_target=sparc-aout ;;
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sparc64-*-elf*) bfd_target=sparc64-elf ; target64=true ;;
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# end-sanitize-v9
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sparc*-*-*) bfd_target=sparc-aout ;;
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@ -119,17 +128,32 @@ case "${target}" in
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*-tandem-*) bfd_target=st2000 ;;
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esac
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if [ ! -f ${srcdir}/config/${bfd_target}.mt ] ; then
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if [ -n "${bfd_target}" ] ; then
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echo '***' No file ${srcdir}/config/${bfd_target}.mt 1>&2
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fi
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echo '***' BFD does not support target ${target} 1>&2
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echo '***' Look in bfd/configure.in for supported targets 1>&2
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exit 1
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fi
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target_makefile_frag=config/${bfd_target}.mt
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[ -z "$bfd_target" ] && bfd_target="$target" # For error message.
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# We don't do any links based on the target system, just very minor makefile
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all_targets=false
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for targ in $bfd_target `echo $with_bfd_targets | sed 's/,/ /g'`
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do
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if [ "x$targ" = "xall" ]; then
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all_targets=true
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else
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if [ ! -f ${srcdir}/config/${targ}.mt ] ; then
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if [ -n "${targ}" ] ; then
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echo '***' No file ${srcdir}/config/${targ}.mt 1>&2
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fi
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echo '***' BFD does not support target ${targ} 1>&2
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echo '***' Look in bfd/configure.in for supported targets 1>&2
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exit 1
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fi
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if [ "x$bfd_target" = "x$targ" ]; then
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target_makefile_frag=${srcdir}/config/${targ}.mt
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else
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target_extra_frags="$target_extra_frags ${srcdir}/config/${targ}.mt"
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fi
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fi
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done
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# We don't do any links based on the target system, just minor makefile
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# config.
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# post-target:
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@ -137,16 +161,6 @@ target_makefile_frag=config/${bfd_target}.mt
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rm -f Makefile.tmp Makefile.2
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mv Makefile Makefile.tmp
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case ${with_minimal_bfd} in
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yes) echo MINIMIZE=1 > Makefile.2 ;;
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no | "") echo MINIMIZE=0 > Makefile.2 ;;
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*)
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echo "*** bad value \"${with_minimal_bfd}\" for minimal-bfd flag; ignored" 1>&2
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with_minimal_bfd=no
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echo MINIMIZE=0 > Makefile.2
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;;
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esac
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case ${with_64_bit_bfd} in
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yes) want64=true ;;
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no | "") want64=false ;;
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@ -166,19 +180,108 @@ case ${host64}-${target64}-${want64} in
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;;
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esac
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if [ x${with_minimal_bfd} = xyes ] \
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&& grep -s TARGET_BACKENDS ${srcdir}/${target_makefile_frag} ; then
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echo 'BFD_BACKENDS = $(TARGET_BACKENDS)' >> Makefile.2
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else
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echo 'BFD_BACKENDS = $(ALL_BACKENDS)' >> Makefile.2
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fi
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# The default vector in the primary target.
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DEFAULT_VECTOR=`sed -n '
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s/DEFAULT_VECTOR[ ]*=[ ]*\([^ ]*\)/\1/p
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' $target_makefile_frag`
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if [ x${with_minimal_bfd} = xyes ] \
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&& grep -s TARGET_CPUS ${srcdir}/${target_makefile_frag} ; then
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echo 'BFD_MACHINES = $(TARGET_CPUS)' >> Makefile.2
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else
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if [ x${all_targets} = xfalse ]; then
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allfrags="$target_makefile_frag $target_extra_frags"
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# The default and selected vectors in all the configured targets.
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SELECT_VECS=`sed -n '
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s/DEFAULT_VECTOR[ ]*=[ ]*\([^ ]*\)/\1/p
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s/SELECT_VECS[ ]*=[ ]*\([^ ]*\)/\1/p
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' $allfrags | sort -u`
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# The architectures in all the configured targets.
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SELECT_ARCHITECTURES=`sed -n '
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s/SELECT_ARCHITECTURES[ ]*=[ ]*//p
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' $allfrags | sort -u`
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# Target backend .o files.
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tb=
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for vec in $SELECT_VECS
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do
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case "$vec" in
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a29kcoff_big_vec) tb="$tb coff-a29k.o" ;;
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a_out_adobe_vec) tb="$tb aout-adobe.o" ;;
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aout_mips_little_vec) tb="$tb mipsbsd.o" ;;
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b_out_vec_big_host) tb="$tb bout.o" ;;
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b_out_vec_little_host) tb="$tb bout.o" ;;
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bfd_elf32_hppa_vec) tb="$tb elf32-hppa.o elf32.o elf.o" ;;
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bfd_elf32_i386_vec) tb="$tb elf32-i386.o elf32.o elf.o" ;;
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bfd_elf32_i860_vec) tb="$tb elf32-i860.o elf32.o elf.o" ;;
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bfd_elf32_m68k_vec) tb="$tb elf32-m68k.o elf32.o elf.o" ;;
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bfd_elf32_sparc_vec) tb="$tb elf32-sparc.o elf32.o elf.o" ;;
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# start-sanitize-v9
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bfd_elf64_sparc_vec) tb="$tb elf64-sparc.o elf64.o elf.o" ;;
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# end-sanitize-v9
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bfd_nlm32_i386_vec) tb="$tb nlm32-i386.o" ;;
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ecoff_big_vec) tb="$tb coff-mips.o" ;;
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ecoff_little_vec) tb="$tb coff-mips.o" ;;
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ecoffalpha_little_vec) tb="$tb coff-alpha.o" ;;
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h8300coff_vec) tb="$tb coff-h8300.o" ;;
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h8500coff_vec) tb="$tb coff-h8500.o" ;;
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host_aout_vec) tb="$tb host-aout.o" ;;
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hp300bsd_vec) tb="$tb hp300bsd.o" ;;
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hp300hpux_vec) tb="$tb hp300hpux.o" ;;
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hppa_vec) tb="$tb hppa.o" ;;
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i386aout_vec) tb="$tb i386aout.o" ;;
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i386bsd_vec) tb="$tb i386bsd.o" ;;
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i386coff_vec) tb="$tb coff-i386.o" ;;
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i386linux_vec) tb="$tb i386linux.o" ;;
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i386lynx_vec) tb="$tb i386lynx.o" ;;
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icoff_big_vec) tb="$tb coff-i960.o" ;;
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icoff_little_vec) tb="$tb coff-i960.o" ;;
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ieee_vec) tb="$tb ieee.o" ;;
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m68kcoff_vec) tb="$tb coff-m68k.o" ;;
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m68kcoffun_vec) tb="$tb coff-u68k.o" ;;
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m88kbcs_vec) tb="$tb coff-m88k.o" ;;
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newsos3_vec) tb="$tb newsos3.o" ;;
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rs6000coff_vec) tb="$tb coff-rs6000.o" ;;
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shcoff_vec) tb="$tb coff-sh.o" ;;
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srec_vec) tb="$tb srec.o" ;;
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sunos_big_vec) tb="$tb sunos.o aout32.o stab-syms.o" ;;
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symbolsrec_vec) tb="$tb srec.o" ;;
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we32kcoff_vec) tb="$tb coff-we32k.o" ;;
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z8kcoff_vec) tb="$tb coff-z8k.o" ;;
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"") ;;
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*) echo "*** unknown target vector $vec in $f" 1>&2; exit 1 ;;
|
||||
esac
|
||||
done
|
||||
|
||||
# Target architecture .o files.
|
||||
ta=`echo $SELECT_ARCHITECTURES | sed -e s/bfd_/cpu-/g -e s/_arch/.o/g`
|
||||
|
||||
# Weed out duplicate .o files.
|
||||
tb=`echo $tb | tr -s ' ' '\012' | sort -u | tr '\012' ' '`
|
||||
ta=`echo $ta | tr -s ' ' '\012' | sort -u | tr '\012' ' '`
|
||||
|
||||
echo "BFD_BACKENDS = $tb" >> Makefile.2
|
||||
echo "BFD_MACHINES = $ta" >> Makefile.2
|
||||
|
||||
# Only set these if they will be nonempty, for the clever echo.
|
||||
test -n "$SELECT_VECS" &&
|
||||
selvecs=`echo $SELECT_VECS | sed -e 's/^/\&/' -e 's/ \(.\)/,\&\1/g'`
|
||||
test -n "SELECT_ARCHITECTURES" &&
|
||||
selarchs=`echo $SELECT_ARCHITECTURES | sed -e 's/ \(.\)/,\1/g'`
|
||||
|
||||
else # all_targets is true
|
||||
echo 'BFD_BACKENDS = $(ALL_BACKENDS)' >> Makefile.2
|
||||
echo 'BFD_MACHINES = $(ALL_MACHINES)' >> Makefile.2
|
||||
fi
|
||||
fi # all_targets is true
|
||||
|
||||
test -n "$DEFAULT_VECTOR" && defvec="$DEFAULT_VECTOR"
|
||||
|
||||
echo "TDEFAULTS = \
|
||||
${defvec+-DDEFAULT_VECTOR=$defvec} \
|
||||
${selvecs+-DSELECT_VECS='$selvecs'} \
|
||||
${selarchs+-DSELECT_ARCHITECTURES='$selarchs'}" \
|
||||
>> Makefile.2
|
||||
|
||||
cat Makefile.tmp >> Makefile.2
|
||||
rm -f Makefile.tmp
|
||||
|
|
|
|||
|
|
@ -318,31 +318,6 @@ in this structure.
|
|||
|
||||
*/
|
||||
|
||||
/* The default is to define a target_vector containing all the targets.
|
||||
By setting MINIMIZE=1 on the "make" command line, the user can change this
|
||||
to a vector containing just DEFAULT_VECTOR and any required
|
||||
traditional-core-file handler. (This is to save space in the executables.)
|
||||
The config files can also override the default large vector by giving an
|
||||
explicit SELECT_VECS macro. */
|
||||
|
||||
#if MINIMIZE && defined(DEFAULT_VECTOR) && !defined(SELECT_VECS)
|
||||
#ifdef TRAD_CORE
|
||||
#define SELECT_VECS &DEFAULT_VECTOR,&trad_core_vec
|
||||
#endif
|
||||
#ifdef SCO_CORE
|
||||
#define SELECT_VECS &DEFAULT_VECTOR,&sco_core_vec
|
||||
#endif
|
||||
#ifdef AIX386_CORE
|
||||
#define SELECT_VECS &DEFAULT_VECTOR,&aix386_core_vec
|
||||
#endif
|
||||
#ifdef HPUX_CORE
|
||||
#define SELECT_VECS &DEFAULT_VECTOR,&hpux_core_vec
|
||||
#endif
|
||||
#ifndef SELECT_VECS
|
||||
#define SELECT_VECS &DEFAULT_VECTOR
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* All known xvecs. They are listed a second time below, since
|
||||
we can't intermix extern's and initializers. */
|
||||
extern bfd_target i386lynx_vec;
|
||||
|
|
@ -397,14 +372,7 @@ extern bfd_target we32kcoff_vec;
|
|||
extern bfd_target shcoff_vec;
|
||||
extern bfd_target hp300hpux_vec;
|
||||
extern bfd_target hp300bsd_vec;
|
||||
|
||||
#if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD)
|
||||
extern bfd_target hppa_vec;
|
||||
#endif
|
||||
|
||||
#ifdef DEFAULT_VECTOR
|
||||
extern bfd_target DEFAULT_VECTOR;
|
||||
#endif
|
||||
|
||||
bfd_target *target_vector[] = {
|
||||
|
||||
|
|
@ -414,10 +382,6 @@ bfd_target *target_vector[] = {
|
|||
|
||||
#else /* not SELECT_VECS */
|
||||
|
||||
#ifdef DEFAULT_VECTOR
|
||||
&DEFAULT_VECTOR,
|
||||
#endif
|
||||
|
||||
&i386coff_vec,
|
||||
&i386aout_vec,
|
||||
&i386lynx_vec,
|
||||
|
|
@ -431,7 +395,7 @@ bfd_target *target_vector[] = {
|
|||
anymore. If you want to test the stuff yourself, go ahead...
|
||||
steve@cygnus.com
|
||||
Worse, since there is no magic number for archives, there
|
||||
can annoying target mis-matches. */
|
||||
can be annoying target mis-matches. */
|
||||
&oasys_vec,
|
||||
#endif
|
||||
&sunos_big_vec,
|
||||
|
|
@ -443,7 +407,9 @@ bfd_target *target_vector[] = {
|
|||
&m88kbcs_vec,
|
||||
&srec_vec,
|
||||
&symbolsrec_vec,
|
||||
/* &tekhex_vec,*/
|
||||
#if 0
|
||||
&tekhex_vec,
|
||||
#endif
|
||||
&icoff_little_vec,
|
||||
&icoff_big_vec,
|
||||
&bfd_elf32_sparc_vec,
|
||||
|
|
@ -478,6 +444,10 @@ bfd_target *target_vector[] = {
|
|||
&hp300bsd_vec,
|
||||
&we32kcoff_vec,
|
||||
|
||||
#endif /* not SELECT_VECS */
|
||||
|
||||
/* Add any required traditional-core-file-handler. */
|
||||
|
||||
#ifdef TRAD_CORE
|
||||
&trad_core_vec,
|
||||
#endif
|
||||
|
|
@ -491,8 +461,7 @@ bfd_target *target_vector[] = {
|
|||
&hpux_core_vec,
|
||||
#endif
|
||||
|
||||
#endif /* not SELECT_VECS */
|
||||
NULL, /* end of list marker */
|
||||
NULL /* end of list marker */
|
||||
};
|
||||
|
||||
/* default_vector[0] contains either the address of the default vector,
|
||||
|
|
@ -502,7 +471,7 @@ bfd_target *default_vector[] = {
|
|||
#ifdef DEFAULT_VECTOR
|
||||
&DEFAULT_VECTOR,
|
||||
#endif
|
||||
0,
|
||||
NULL
|
||||
};
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue