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Re: Better communication about spectre/meltdown



On Tue, 2018-04-03 at 05:52 -0400, Roberto C. Sánchez wrote:
> On Mon, Apr 02, 2018 at 01:45:40AM +0100, Ben Hutchings wrote:
> > 
> > I would suggest looking at how non-default compiler versions are built
> > in other suites.
> > 
> > Ben.
> > 
> 
> Hi Ben,
> 
> Could you provide some more specific pointers at what I should look at?
> I tried looking at gcc-4.8 in jessie, but I was not able to figure out
> what is different about it that makes it only build a subset of the
> packages built by gcc-4.9.

I didn't know how it worked, only that it does work.  Anyway, I've
looked now and I think you need to apply the following patch:

--- gcc-4.9-4.9.2/debian/rules.conf
+++ gcc-4.9-4.9.2/debian/rules.conf
@@ -392,7 +392,7 @@
 # ensure that the common libs, built from the next GCC version are available
 ifeq ($(PKGSOURCE),gcc-$(BASE_VERSION))
   ifneq ($(with_common_libs),yes)
-    BASE_BUILD_DEP = gcc-4.10-base,
+    BASE_BUILD_DEP = gcc-4.7-base,
   endif
 endif
 
--- gcc-4.9-4.9.2/debian/rules.defs
+++ gcc-4.9-4.9.2/debian/rules.defs
@@ -373,9 +373,9 @@
 # common things ---------------
 # build common packages, where package names don't differ in different
 # gcc versions (fixincludes, libgcj-common) ...
-with_common_pkgs := yes
+with_common_pkgs := no
 # ... and some libraries, which do not change (libgcc1, libssp0).
-with_common_libs := yes
+with_common_libs := no
 # XXX: should with_common_libs be "yes" only if this is the default compiler
 # version on the targeted arch?
 
--- END ---

and then run 'debian/rules control' to update debian/control etc.

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                       - Robert Coveyou

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