ELF section flag SHF_EXCLUDE

[Alan Modra]

commit 18ae9cc1db made SHF_EXCLUDE generic.  Prior to that the flag
was only defined for sparc, ppc, or32, and i370.  The problem is that
the flag was left in the very limited SHF_MASKPROC processor specific
range rather than being put in the generic range, and it clashes with
other processor specific section flags.  aarch64, arm, hppa, mcore,
microblaze, mips, mmix, nfp, score and v850 all define flags with the
same value.  This means SHF_EXCLUDE as is really shouldn't be used on
any of those machines.

aarch64.h:#define SHF_COMDEF		0x80000000
arm.h:#define SHF_COMDEF         	0x80000000
hppa.h:#define SHF_PARISC_SBP		0x80000000
mcore.h:#define SHF_MCORE_NOREAD	0x80000000
microblaze.h:#define SHF_MICROBLAZE_NOREAD	0x80000000
mips.h:#define SHF_MIPS_STRING		0x80000000
mmix.h:#define SHF_MMIX_CANRELAX	0x80000000
nfp.h:#define SHF_NFP_INIT		0x80000000
score.h:#define SHF_SCORE_STRING	0x80000000
v850.h:#define SHF_RENESAS_ABS		0x80000000

SHF_PARISC_SBP, SHF_MCORE_NOREAD, SHF_MICROBLAZE_NOREAD,
SHF_MIPS_STRING, SHF_MMIX_CANRELAX, SHF_SCORE_STRING, and
SHF_RENESAS_ABS only appear in include/elf/*.h above.  I haven't
searched any of the relevant ABI docs, if such exist.

SHF_COMDEF is decoded by readelf (once you disable SHF_EXCLUDE for arm
and aarch64), but is described in arm docs by: "the legacy SHF_COMDEF
ELF section flag is deprecated".

SHF_NFP_INIT is used in opcodes/nfp-dis.c but not set by
bfd/elf64-nfp.c.

So what to do?  Disabling the flag and assembler support for 'e' in
flags is one possibility, but not a good idea for a 10 year old
feature.

-- 
Alan Modra
Australia Development Lab, IBM