Date: Sat, 21 Jan 2017 14:16:33 -0800 From: Mark Millard <markmi@dsl-only.net> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: 3.9.1's lld and powerpc64 for -pie use: can't create dynamic relocation R_PPC64_REL24 against readonly segment Message-ID: <5FF1F3C4-E169-4967-9B08-F97A52B33E6F@dsl-only.net>
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For:
# more main.c static volatile char big_area[67001] = "This is a test";
int main ()
{
big_area[67000] = '9';
}
I get (the -fPIE is not required for the behavior):
# clang -fuse-ld=lld -Wl,-t -pie -fPIE main.c
/usr/lib/Scrt1.o
/usr/lib/crti.o
/usr/lib/crtbeginS.o
/tmp/main-c6f752.o
/usr/lib/libgcc_s.so
/lib/libc.so.7
/usr/lib/libgcc_s.so
/usr/lib/crtendS.o
/usr/lib/crtn.o
can't create dynamic relocation R_PPC64_REL24 against readonly segment
can't create dynamic relocation R_PPC64_REL24 against readonly segment
can't create dynamic relocation R_PPC64_REL24 against readonly segment
can't create dynamic relocation R_PPC64_REL24 against readonly segment
can't create dynamic relocation R_PPC64_REL24 against readonly segment
can't create dynamic relocation R_PPC64_REL24 against readonly segment
clang: error: linker command failed with exit code 1 (use -v to see invocation)
(This is difficult to study because it does not leave even a
partial a.out and it does not report the specifics of what
segment or what symbol or the like.)
Even an empty source produces that, but also including the
expected:
undefined symbol: main in /usr/lib/Scrt1.o
It appears that the R_PPC64_REL24's are some subset of. . .
/usr/lib/Scrt1.o :
00000000000000cc R_PPC64_REL24 atexit
00000000000000d8 R_PPC64_REL24 _init_tls
00000000000000f8 R_PPC64_REL24 atexit
00000000000001b4 R_PPC64_REL24 _init
0000000000000240 R_PPC64_REL24 main
0000000000000248 R_PPC64_REL24 exit
00000000000002fc R_PPC64_REL24 _fini
(That would be 6 by ignoring main, matching
the message count.)
/usr/lib/crtbeginS.o :
0000000000000040 R_PPC64_REL24 __cxa_finalize
0000000000000000 R_PPC64_REL24 .opd
0000000000000000 R_PPC64_REL24 .opd+0x0000000000000018
/usr/lib/crtendS.o :
0000000000000000 R_PPC64_REL24 .opd
main.o , if I have it produced, does not have R_PPC64_REL24
in it.
===
Mark Millard
markmi at dsl-only.net
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