Fail to build libgcc_s for 060

[Anders Lindgren <ali%dflund.se@localhost>]

/*
 * Background: netbsd is hideously slow on 68060, and takes well over six
 * minutes to boot to a login prompt. When I first tried to investigate it
 * on 8.0_BETA on my A4000/060 the other year, it seemed to spend
 * disproportionate amounts of time taking emultraps, so I want to build
 * a fully 68060-tuned netbsd for comparison.
 */

In my (low intensity) quest to build a (w)hol(l)y 68060 tuned netbsd 
release, I've had problems getting both kernels and userland built for 
060, but I think I've got that part sorted out - in theory at least:

* First, I built all kernels (only) with "build.sh ... tools kernels" 
letting the kernel config(s) do the work to get the compiler flags right, 
and this works a charm afaict.

* Then I returned to build the userland ("build.sh -u ... release"), 
pointing $MAKECONF to a file containing only "CPUFLAGS=-m68060". This used 
to work fine for userland, but cause problems when I tried to build all in 
one go, because it would invariably spill into kernel builds and break the 
asm files - but now I got all kernels built beforehand.

However, with yesterday's -current source, this latter step now appears to 
break userland, while building the target libgcc:

#     build  libgcc_s/libgcc_s.so.1.0
rm -f libgcc_s.so.1.0
/storage/NetBSD/builds/amiga060/tools/bin/m68k--netbsdelf-gcc 
-nodefaultlibs -shared -Wl,-soname,libgcc_s.so.1  -Wl,--warn-shared-textrel -Wl,-Map=libgcc_s.so.1.map   --sysroot=/storage/NetBSD/builds/amiga060/obj/usr/src/destdir.amiga -nodefaultlibs -Wl,-z -Wl,nodelete -Wl,--version-script=/storage/NetBSD/builds/amiga060/obj/usr/src/external/gpl3/gcc/lib/libgcc/libgcc_s/libgcc.map  -o libgcc_s.so.1.0.tmp  -Wl,-rpath,/lib  -L=/lib -Wl,-x  -Wl,--whole-archive libgcc_s_pic.a  -Wl,--no-whole-archive/storage/NetBSD/builds/amiga060/tools/lib/gcc/m68k--netbsdelf/7.4.0/../../../../m68k--netbsdelf/bin/ld: libgcc_s_pic.a(_float.pico):(.text+0x8): relocation truncated to fit: R_68K_PLT16 against symbol `$_exception_handler' defined in .text section in libgcc_s_pic.a(_floatex.pico)
/storage/NetBSD/builds/amiga060/tools/lib/gcc/m68k--netbsdelf/7.4.0/../../../../m68k--netbsdelf/bin/ld: libgcc_s_pic.a(_float.pico):(.text+0x18): relocation truncated to fit: R_68K_PLT16 against symbol `$_exception_handler' defined in .text section in libgcc_s_pic.a(_floatex.pico)
/storage/NetBSD/builds/amiga060/tools/lib/gcc/m68k--netbsdelf/7.4.0/../../../../m68k--netbsdelf/bin/ld: libgcc_s_pic.a(_float.pico):(.text+0x22): relocation truncated to fit: R_68K_PLT16 against symbol `$_exception_handler' defined in .text section in libgcc_s_pic.a(_floatex.pico)
/storage/NetBSD/builds/amiga060/tools/lib/gcc/m68k--netbsdelf/7.4.0/../../../../m68k--netbsdelf/bin/ld: libgcc_s_pic.a(_float.pico):(.text+0x2c): relocation truncated to fit: R_68K_PLT16 against symbol `$_exception_handler' defined in .text section in libgcc_s_pic.a(_floatex.pico)
/storage/NetBSD/builds/amiga060/tools/lib/gcc/m68k--netbsdelf/7.4.0/../../../../m68k--netbsdelf/bin/ld: libgcc_s_pic.a(_float.pico):(.text+0x3c): relocation truncated to fit: R_68K_PLT16 against symbol `$_exception_handler' defined in .text section in libgcc_s_pic.a(_floatex.pico)
collect2: error: ld returned 1 exit status

*** Failed target:  libgcc_s.so.1.0
*** Failed command: 
/storage/NetBSD/builds/amiga060/tools/bin/m68k--netbsdelf-gcc -nodefaultlibs -shared -Wl,-soname,libgcc_s.so.1 -Wl,--warn-shared-textrel -Wl,-Map=libgcc_s.so.1.map --sysroot=/storage/NetBSD/builds/amiga060/obj/usr/src/destdir.amiga -nodefaultlibs -Wl,-z -Wl,nodelete -Wl,--version-script=/storage/NetBSD/builds/amiga060/obj/usr/src/external/gpl3/gcc/lib/libgcc/libgcc_s/libgcc.map -o libgcc_s.so.1.0.tmp -Wl,-rpath,/lib -L=/lib -Wl,-x -Wl,--whole-archive libgcc_s_pic.a -Wl,--no-whole-archive
*** Error code 1

Stop.
nbmake[8]: stopped in /usr/src/external/gpl3/gcc/lib/libgcc/libgcc_s

*** Failed target:  dependall
*** Failed command: cd "/usr/src/external/gpl3/gcc/lib/libgcc/libgcc_s"; /storage/NetBSD/builds/amiga060/tools/bin/nbmake realall

It seems strange that libgcc would not build for 68060, but -m68060 is 
really the only thing I've manipulated here; looking at the compile flags 
for the (generated asm) floatex.pico, it looks like:

#   compile  libgcc_s/_floatex.pico
/storage/NetBSD/builds/amiga060/tools/bin/m68k--netbsdelf-gcc  -m68060 -fPIE --sysroot=/storage/NetBSD/builds/amiga060/obj/usr/src/destdir.amiga -I/usr/src/external/gpl3/gcc/lib/libgcc/libgcc_s -I/usr/src/external/gpl3/gcc/lib/libgcc/arch/m68k -I/usr/src/external/gpl3/gcc/usr.bin/gcc/arch/m68k -DIN_GCC -DIN_LIBGCC2 -I/usr/src/external/gpl3/gcc/dist/libgcc -I/usr/src/external/gpl3/gcc/dist/libgcc/. -I/usr/src/external/gpl3/gcc/dist/libgcc/../gcc -I/usr/src/external/gpl3/gcc/dist/libgcc/../include  -fPIC -fbuilding-libgcc -fno-stack-protector -I/usr/src/external/gpl3/gcc/dist/gcc/config/m68k -I/usr/src/external/gpl3/gcc/dist/gcc/ginclude -I/usr/src/external/gpl3/gcc/dist/libgcc -I/usr/src/external/gpl3/gcc/dist/libgcc/config -I/usr/src/external/gpl3/gcc/dist/libgcc/config/m68k -I/usr/src/external/gpl3/gcc/dist/gcc -I/usr/src/external/gpl3/gcc/dist/include -I. -DHAVE_CC_TLS -I/storage/NetBSD/builds/amiga060/obj/usr/src/external/gpl3/gcc/usr.bin/backend  -x assembler-with-cpp -c -fPIC   
 _floatex.S -o _floatex.pico

..and there's indeed nothing else funky going on with the compiler flags.

This whole build machinery is pretty opaque to me, so I'm not sure how to 
proceed. Surely it must be possible to build the target gcc specifically 
for 68060?

(CPUFLAGS spilling into the libgcc build would indicate that the target 
system's gcc might become unable to build anything but 68060 binaries, but 
that's fine for now)

Best regards,
Ali:)