[lld] r322041 - Do not use parallelForEach to call maybeCompress().

[Rui Ueyama via llvm-commits]

Author: ruiu
Date: Mon Jan  8 15:12:42 2018
New Revision: 322041

URL: http://llvm.org/viewvc/llvm-project?rev=322041&view=rev
Log:
Do not use parallelForEach to call maybeCompress().

Currently LLVM's paralellForEach has a problem with reentracy.
That caused https://bugs.llvm.org/show_bug.cgi?id=35788 (lld somtimes
hangs while linking Ruby 2.4) because maybeCompress calls writeTo which
uses paralellForEach.

This patch is to avoid using paralellForEach to call maybeCompress
to workaround the issue.

Modified:
    lld/trunk/ELF/Writer.cpp

Modified: lld/trunk/ELF/Writer.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Writer.cpp?rev=322041&r1=322040&r2=322041&view=diff
==============================================================================
--- lld/trunk/ELF/Writer.cpp (original)
+++ lld/trunk/ELF/Writer.cpp Mon Jan  8 15:12:42 2018
@@ -432,8 +432,8 @@ template <class ELFT> void Writer<ELFT>:
   // If -compressed-debug-sections is specified, we need to compress
   // .debug_* sections. Do it right now because it changes the size of
   // output sections.
-  parallelForEach(OutputSections,
-                  [](OutputSection *Sec) { Sec->maybeCompress<ELFT>(); });
+  for (OutputSection *Sec : OutputSections)
+    Sec->maybeCompress<ELFT>();
 
   Script->allocateHeaders(Phdrs);