From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 23 Mar 2015 20:20:27 +0000 (+0100)
Subject: Issue #23654: Fix faulthandler._stack_overflow() for the Intel C Compiler (ICC)
X-Git-Tag: v3.5.0a3~80^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=19276f184f00829ce55ce0e98f8db06d93b7d665;p=thirdparty%2FPython%2Fcpython.git

Issue #23654: Fix faulthandler._stack_overflow() for the Intel C Compiler (ICC)

Issue #23654: Turn off ICC's tail call optimization for the stack_overflow
generator. ICC turns the recursive tail call into a loop.

Patch written by Matt Frank.
---

diff --git a/Misc/ACKS b/Misc/ACKS
index cdee1bbcf8fe..d0d5e257d255 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -436,6 +436,7 @@ Doug Fort
 Chris Foster
 John Fouhy
 Andrew Francis
+Matt Frank
 Stefan Franke
 Martin Franklin
 Kent Frazier
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index 01e7beb25500..c729414a4979 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -911,7 +911,14 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
 }
 
 #if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
-static Py_uintptr_t
+#ifdef __INTEL_COMPILER
+   /* Issue #23654: Turn off ICC's tail call optimization for the
+    * stack_overflow generator. ICC turns the recursive tail call into
+    * a loop. */
+#  pragma intel optimization_level 0
+#endif
+static
+Py_uintptr_t
 stack_overflow(Py_uintptr_t min_sp, Py_uintptr_t max_sp, size_t *depth)
 {
     /* allocate 4096 bytes on the stack at each call */