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authorAlan Modra <amodra@gmail.com>2017-07-31 10:18:46 +0930
committerAlan Modra <amodra@gmail.com>2017-07-31 13:20:44 +0930
commitd44c746aedeb31aacd867edc2da30dedc1e63e15 (patch)
tree2e8e6f68db504b37e84bfc8644321e4ccfc983c5 /ld
parent93e0a1eab1c7963d77513aa503b129ea03cd6d39 (diff)
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PR 21847, PowerPC64 --plt-localentry again
This makes ld warn about --plt-localentry if a version of glibc without the necessary ld.so checks is detected, and revises the documentation. bfd/ * elf64-ppc.c (ppc64_elf_tls_setup): Warn on --plt-localentry without ld.so checks. gold/ * powerpc.cc (Target_powerpc::scan_relocs): Warn on --plt-localentry without ld.so checks. ld/ * ld.texinfo (plt-localentry): Revise.
Diffstat (limited to 'ld')
-rw-r--r--ld/ChangeLog4
-rw-r--r--ld/ld.texinfo7
2 files changed, 9 insertions, 2 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog
index 2a371b9..3c918e6 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,7 @@
+2017-07-31 Alan Modra <amodra@gmail.com>
+
+ * ld.texinfo (plt-localentry): Revise.
+
2017-07-29 Alan Modra <amodra@gmail.com>
* ld.texinfo (plt-localentry): Document.
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 172c1dd..ebe7e7b 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -7613,8 +7613,11 @@ Such an external function can be called via the PLT without saving r2
or restoring it on return, avoiding a common load-hit-store for small
functions. The optimization is attractive, with up to 40% reduction
in execution time for a small function, but can result in symbol
-interposition failures. Use with care. @option{--no-plt-localentry}
-is the default.
+interposition failures. Also, minor changes in a shared library,
+including system libraries, can cause a function that was localentry:0
+to become localentry:8. This will result in a dynamic loader
+complaint and failure to run. The option is experimental, use with
+care. @option{--no-plt-localentry} is the default.
@end table
@ifclear GENERIC