As I prepared the 0.12 release for Debian, I noticed that libust.so was
not PIC:
$ readelf -d libust/.libs/libust.so.0.0.0 | grep TEXTREL
0x0000000000000016 (TEXTREL) 0x0
Since all of the objects in libust are built with -fPIC, I thought
perhaps there was some assembly added between 0.11 and 0.12 that
contained text relocations. I bisected the two tags down to the
offending commit:
eb5d20c68aaf73661ffc02ba8fea3683c0358702
Within that commit, it seems to be a problem in include/ust/marker.h
with these lines:
@@ -129,7 +124,12 @@ struct marker {
[...]
+ /*".section __markers_ptrs\n\t"*/ \
+ ".section __markers_ptrs,\"a\",@progbits\n\t"
\
If I make the __markers_ptrs section writable, with:
".section __markers_ptrs,\"aw\"\n\t
TEXTREL goes away and everything seems okay, tests pass. Is this
a correct solution? I don't understand why the section must be writable
to avoid relocations, can anyone explain?
Cheers
Jon
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