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Bug#855197: gcc-6: Please use --with-cpu on sparc without biarch

Source: gcc-6
Version: 6.3.0-6
Severity: normal
Tags: patch
User: helmutg@debian.org
Usertags: rebootstrap


The rebootstrap for sparc with nobiarch still fails [1].

This is because we're using --with-cpu-32=ultrasparc for all
sparc configurations although we have to use --with-cpu=ultrasparc

An alternative approach would be to apply the patch for PR libstdc++/64735
on sparc as well and use --with-cpu-32=ultrasparc on biarch configurations
as well. This means, we'd be defaulting to SPARCv7 on nobiarch confiurations
while UltraSPARC (SPARCv8+) would be use for biarch configurations. This
would allow the "sparc" port to be bootstrapped for old sun4m hardware.

However, after a quick discussion in #sparc, we have come to the conclusion
to pin sparc to UltraSPARC for now and create a new GNU triplet for SPARCv7
in the future.

The attached patch fixes the FTCBFS issue for sparc-nobiarch.


> [1] https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_sparc_gcc6_nobiarch/

 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
--- gcc-6-6.3.0/debian/rules2.old	2017-02-15 11:51:16.000000000 +0100
+++ gcc-6-6.3.0/debian/rules2	2017-02-15 11:53:56.619034818 +0100
@@ -544,9 +544,11 @@
 ifneq (,$(findstring sparc-linux,$(DEB_TARGET_GNU_TYPE)))
-  CONFARGS += --with-cpu-32=ultrasparc
   ifeq ($(biarch64),yes)
     CONFARGS += --enable-targets=all
+    CONFARGS += --with-cpu-32=ultrasparc
+  else
+    CONFARGS += --with-cpu=ultrasparc

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