[PATCH, PR d/87824] Committed fix for failing EH execution test on i386.

[Iain Buclaw <ibuclaw@gdcproject.org>]

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Hi,

This patches fixes one of the problems noted in PR d/87824, where
exception chaining does not work as per expected semantics if
-forder-blocks-and-partition is enabled on i386.

Having it default off if not explicitly given seems the most
reasonable thing to do, as there's no alternative way to determine if
two in-flight exceptions should be chained at run-time if this
optimization is turned on.

Bootstrapped and tested on x86_64-linux-gnu /
RUNTESTFLAGS="--target_board=unix/-m32"

Committed to trunk as r267985.

-- 
Iain
---
gcc/d/ChangeLog:

2019-01-16  Iain Buclaw  <ibuclaw@gdcproject.org>

    PR d/87824
    * d-lang.cc (d_post_options): Disable implicit
    -forder-blocks-and-partition.
---

[-- Attachment #2: noreorder.patch --]
[-- Type: text/x-patch, Size: 738 bytes --]

diff --git a/gcc/d/d-lang.cc b/gcc/d/d-lang.cc
index 109bf4bf139..b53e56e65a2 100644
--- a/gcc/d/d-lang.cc
+++ b/gcc/d/d-lang.cc
@@ -725,6 +725,12 @@ d_post_options (const char ** fn)
 	global.params.useSwitchError = false;
     }
 
+  /* Turn off partitioning unless it was explicitly requested, as it doesn't
+     work with D exception chaining, where EH handler uses LSDA to determine
+     whether two thrown exception are in the same context.  */
+  if (!global_options_set.x_flag_reorder_blocks_and_partition)
+    global_options.x_flag_reorder_blocks_and_partition = 0;
+
   /* Error about use of deprecated features.  */
   if (global.params.useDeprecated == DIAGNOSTICinform
       && global.params.warnings == DIAGNOSTICerror)