Bug#905536: python3.7: disable -O3 on ia64 due to compiler bug

Source: python3.7
Severity: normal
Tags: patch
User: [email protected]
Usertags: ia64

Dear Maintainer,

The attached patch includes a number of fixes to python3.7's
debian/rules:
1) Due to a gcc bug[1], -O3 needs to be disabled on ia64.
2) The -O2 override for m68k added for Debian bug #326903 is
no longer needed, and was removed
3) The -mieee and -O2 overrides for DEC Alpha added for Debian
bug #212912 are no longer needed, and were removed

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85412

-- System Information:
Debian Release: buster/sid
  APT prefers unreleased
  APT policy: (500, 'unreleased'), (500, 'unstable')
Architecture: ia64

Kernel: Linux 4.17.0-1-mckinley (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

--- debian/rules.orig	2018-08-05 13:09:54.027342191 -0400
+++ debian/rules	2018-08-05 13:12:50.900361875 -0400
@@ -160,14 +160,9 @@
 OPT_CFLAGS   := $(filter-out -O%,$(DPKG_CFLAGS)) # default is -O3
 DEBUG_CFLAGS := $(patsubst -O%,-Og,$(DPKG_CFLAGS))
 
-# on alpha, use -O2 only, use -mieee
-ifeq ($(DEB_HOST_ARCH),alpha)
-    OPT_CFLAGS += -mieee
-    DEBUG_CFLAGS += -mieee
-    EXTRA_OPT_FLAGS += -O2
-endif
-ifeq ($(DEB_HOST_ARCH),m68k)
-    EXTRA_OPT_FLAGS += -O2
+# on ia64, disable -O3 until gcc bug #85412 is fixed
+ifeq ($(DEB_HOST_ARCH),ia64)
+    EXTRA_OPT_CFLAGS += -O2
 endif
 ifneq (,$(filter $(DEB_HOST_ARCH), ppc64 ppc64el))
     OPT_CFLAGS += -fexceptions