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3 Commits

Author SHA1 Message Date
Evgeniy Stepanov
d991cdd50b [asan] A clang flag to enable ELF globals-gc. 
This feature is subtly broken when the linker is gold 2.26 or
earlier. See the following bug for details:
  https://sourceware.org/bugzilla/show_bug.cgi?id=19002

Since the decision needs to be made at compilation time, we can not
test the linker version. The flag is off by default on ELF targets,
and on otherwise.

llvm-svn: 302591
 2017-05-09 21:57:43 +00:00
Evgeniy Stepanov
c7b90947bd [asan] Unconditionally enable GC of globals on COFF. 
This change restores pre-r301225 behavior, where linker GC compatible global
instrumentation was used on COFF targets disregarding -f(no-)data-sections and/or
/Gw flags.

This instrumentation puts each global in a COMDAT with an ASan descriptor for that global.
It effectively enables -fdata-sections, but limits it to ASan-instrumented globals.

llvm-svn: 301374
 2017-04-26 00:51:06 +00:00
Evgeniy Stepanov
df217a2f3c [asan] Disable ASan global-GC depending on the target and compiler flags. 
llvm-svn: 301225
 2017-04-24 19:34:12 +00:00