[Pkg-electronics-devel] Bug#959622: gcc-xtensa-lx106: FTBFS: patches fail to apply

Sun May 3 13:53:43 BST 2020

Source: gcc-xtensa-lx106
Version: 6
Severity: serious
Justification: FTBFS on amd64
Tags: bullseye sid ftbfs
Usertags: ftbfs-20200501 ftbfs-bullseye

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

Relevant part (hopefully):
> make[1]: Entering directory '/<<PKGBUILDDIR>>'
> tar xf /usr/src/gcc-9/gcc-9.3.0-dfsg.tar.xz
> ln -s gcc-9* gcc-source
> cp debian/overlay/include/xtensa-config.h gcc-source/include/
> mkdir -p debian/stamp
> cp /usr/share/doc/gcc-9-source/copyright debian/copyright-gcc
> touch debian/stamp/tar
> set -ex; \
> 	cd /<<PKGBUILDDIR>>/gcc-source; \
> 	for patch in git-updates.diff; do \
> 		echo Applying patch "$patch"; \
> 		patch -p2 < /usr/src/gcc-9/patches/$patch; \
> 	done
> + cd /<<PKGBUILDDIR>>/gcc-source
> + echo Applying patch git-updates.diff
> Applying patch git-updates.diff
> + patch -p2
> patching file ChangeLog
> patching file gcc/ChangeLog
> patching file gcc/DATESTAMP
> patching file gcc/builtins.c
> patching file gcc/c/ChangeLog
> patching file gcc/c/c-decl.c
> patching file gcc/c/c-parser.c
> patching file gcc/c/c-tree.h
> patching file gcc/c/c-typeck.c
> patching file gcc/cgraphunit.c
> patching file gcc/common/config/aarch64/aarch64-common.c
> patching file gcc/config/aarch64/aarch64-protos.h
> patching file gcc/config/aarch64/aarch64-simd.md
> patching file gcc/config/aarch64/aarch64.c
> patching file gcc/config/aarch64/aarch64.opt
> patching file gcc/config/aarch64/atomics.md
> patching file gcc/config/aarch64/constraints.md
> patching file gcc/config/aarch64/falkor-tag-collision-avoidance.c
> patching file gcc/config/aarch64/iterators.md
> patching file gcc/config/arc/linux.h
> patching file gcc/config/arm/arm.md
> patching file gcc/config/i386/darwin.h
> patching file gcc/config/i386/i386-builtin.def
> patching file gcc/config/i386/i386.c
> patching file gcc/config/i386/i386.h
> patching file gcc/config/i386/sse.md
> patching file gcc/config/pa/pa.h
> patching file gcc/config/pdp11/pdp11.c
> patching file gcc/config/rs6000/altivec.h
> patching file gcc/config/rs6000/rs6000-c.c
> patching file gcc/config/rs6000/rs6000-cpus.def
> patching file gcc/config/rs6000/rs6000.c
> patching file gcc/config/rs6000/vsx.md
> patching file gcc/config/xtensa/xtensa.c
> patching file gcc/config/xtensa/xtensa.md
> patching file gcc/coverage.c
> patching file gcc/cp/ChangeLog
> patching file gcc/cp/constexpr.c
> patching file gcc/cp/cp-gimplify.c
> patching file gcc/cp/cp-tree.h
> patching file gcc/cp/decl.c
> patching file gcc/cp/expr.c
> patching file gcc/cp/mangle.c
> patching file gcc/cp/name-lookup.c
> patching file gcc/cp/parser.c
> patching file gcc/cp/pt.c
> patching file gcc/cp/semantics.c
> patching file gcc/cp/tree.c
> patching file gcc/d/ChangeLog
> patching file gcc/d/typeinfo.cc
> patching file gcc/dfp.c
> patching file gcc/dwarf2out.c
> patching file gcc/fold-const.c
> patching file gcc/fortran/ChangeLog
> patching file gcc/fortran/array.c
> patching file gcc/fortran/check.c
> patching file gcc/fortran/decl.c
> patching file gcc/fortran/expr.c
> patching file gcc/fortran/interface.c
> patching file gcc/fortran/match.c
> patching file gcc/fortran/resolve.c
> patching file gcc/fortran/trans-decl.c
> patching file gcc/gimple-fold.c
> patching file gcc/gimplify.c
> patching file gcc/ipa-icf-gimple.c
> patching file gcc/params.def
> patching file gcc/print-rtl.c
> patching file gcc/reorg.c
> patching file gcc/resource.c
> patching file gcc/resource.h
> patching file gcc/testsuite/ChangeLog
> patching file gcc/testsuite/c-c++-common/pr94385.c
> patching file gcc/testsuite/g++.dg/abi/mangle72.C
> patching file gcc/testsuite/g++.dg/abi/mangle75.C
> patching file gcc/testsuite/g++.dg/cpp0x/enum40.C
> patching file gcc/testsuite/g++.dg/cpp0x/lambda/lambda-93597.C
> patching file gcc/testsuite/g++.dg/cpp0x/lambda/lambda-constexpr1.C
> patching file gcc/testsuite/g++.dg/cpp0x/lambda/lambda-variadic10.C
> patching file gcc/testsuite/g++.dg/cpp0x/variadic-alias2.C
> patching file gcc/testsuite/g++.dg/cpp0x/variadic178.C
> patching file gcc/testsuite/g++.dg/cpp1z/class-deduction71.C
> patching file gcc/testsuite/g++.dg/cpp1z/fold11.C
> patching file gcc/testsuite/g++.dg/cpp2a/nontype-class36.C
> patching file gcc/testsuite/g++.dg/cpp2a/nontype-class37.C
> patching file gcc/testsuite/g++.dg/debug/pr94459.C
> patching file gcc/testsuite/g++.dg/gomp/pr94477.C
> patching file gcc/testsuite/g++.dg/gomp/pr94512.C
> patching file gcc/testsuite/g++.dg/guality/pr93888.C
> patching file gcc/testsuite/g++.dg/init/array58.C
> patching file gcc/testsuite/g++.dg/init/array59.C
> patching file gcc/testsuite/g++.dg/lookup/pr84733.C
> patching file gcc/testsuite/g++.dg/template/dependent-name14.C
> patching file gcc/testsuite/g++.dg/torture/pr94303.C
> patching file gcc/testsuite/g++.target/aarch64/pr94052.C
> patching file gcc/testsuite/gcc.c-torture/compile/pr94488.c
> patching file gcc/testsuite/gcc.c-torture/execute/pr94130.c
> patching file gcc/testsuite/gcc.c-torture/execute/pr94134.c
> patching file gcc/testsuite/gcc.c-torture/execute/pr94412.c
> patching file gcc/testsuite/gcc.dg/dfp/pr94111.c
> patching file gcc/testsuite/gcc.dg/pr93399.c
> patching file gcc/testsuite/gcc.dg/pr94001.c
> patching file gcc/testsuite/gcc.dg/pr94114.c
> patching file gcc/testsuite/gcc.dg/pr94121.c
> patching file gcc/testsuite/gcc.dg/pr94167.c
> patching file gcc/testsuite/gcc.dg/pr94172-1.c
> patching file gcc/testsuite/gcc.dg/pr94172-2.c
> patching file gcc/testsuite/gcc.dg/pr94189.c
> patching file gcc/testsuite/gcc.dg/pr94211.c
> patching file gcc/testsuite/gcc.dg/pr94277.c
> patching file gcc/testsuite/gcc.dg/pr94283.c
> patching file gcc/testsuite/gcc.dg/pr94368.c
> patching file gcc/testsuite/gcc.dg/torture/pr94206.c
> patching file gcc/testsuite/gcc.dg/torture/pr94479.c
> patching file gcc/testsuite/gcc.dg/torture/pr94482.c
> patching file gcc/testsuite/gcc.dg/tree-ssa/pr93435.c
> patching file gcc/testsuite/gcc.dg/tree-ssa/pr94125.c
> patching file gcc/testsuite/gcc.dg/tree-ssa/pr94482-2.c
> patching file gcc/testsuite/gcc.dg/ubsan/pr94423.c
> patching file gcc/testsuite/gcc.dg/vect/bb-slp-over-widen-2.c
> patching file gcc/testsuite/gcc.dg/vect/pr93069.c
> patching file gcc/testsuite/gcc.dg/vect/pr94443.c
> patching file gcc/testsuite/gcc.dg/vect/slp-perm-12.c
> patching file gcc/testsuite/gcc.dg/vect/vect-over-widen-17.c
> patching file gcc/testsuite/gcc.misc-tests/gcov-pr94029.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-comp-swap-release-acquire.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-acq_rel.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-acquire.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-char.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-consume.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-imm.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-int.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-long.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-relaxed.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-release.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-seq_cst.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic-op-short.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic_cmp_exchange_zero_reg_1.c
> patching file gcc/testsuite/gcc.target/aarch64/atomic_cmp_exchange_zero_strong_1.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_11.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_12.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_13.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_14.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_15.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_16.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_17.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_18.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_19.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_20.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_21.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_22.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_23.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_24.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_25.c
> patching file gcc/testsuite/gcc.target/aarch64/options_set_26.c
> patching file gcc/testsuite/gcc.target/aarch64/pr94435.c
> patching file gcc/testsuite/gcc.target/aarch64/pr94530.c
> patching file gcc/testsuite/gcc.target/aarch64/sync-comp-swap.c
> patching file gcc/testsuite/gcc.target/aarch64/sync-op-acquire.c
> patching file gcc/testsuite/gcc.target/aarch64/sync-op-full.c
> patching file gcc/testsuite/gcc.target/i386/avx2-pr94460.c
> patching file gcc/testsuite/gcc.target/i386/avx512bw-pr94500.c
> patching file gcc/testsuite/gcc.target/i386/avx512bw-pr94509-1.c
> patching file gcc/testsuite/gcc.target/i386/avx512bw-pr94509-2.c
> patching file gcc/testsuite/gcc.target/i386/avx512vl-pr93069.c
> patching file gcc/testsuite/gcc.target/i386/pr94103.c
> patching file gcc/testsuite/gcc.target/i386/pr94283.c
> patching file gcc/testsuite/gcc.target/i386/pr94417-1.c
> patching file gcc/testsuite/gcc.target/i386/pr94417-2.c
> patching file gcc/testsuite/gcc.target/i386/pr94417-3.c
> patching file gcc/testsuite/gcc.target/i386/pr94494.c
> patching file gcc/testsuite/gcc.target/i386/pr94603.c
> patching file gcc/testsuite/gcc.target/powerpc/p9-minmax-3.c
> patching file gcc/testsuite/gcc.target/powerpc/pr90763.c
> patching file gcc/testsuite/gcc.target/powerpc/pr93800.c
> patching file gcc/testsuite/gcc.target/powerpc/pragma_misc9.c
> patching file gcc/testsuite/gcc.target/powerpc/pragma_power6.c
> patching file gcc/testsuite/gcc.target/powerpc/pragma_power7.c
> patching file gcc/testsuite/gcc.target/powerpc/pragma_power8.c
> patching file gcc/testsuite/gcc.target/powerpc/pragma_power9.c
> patching file gcc/testsuite/gcc.target/powerpc/vsu/vec-all-nez-7.c
> patching file gcc/testsuite/gcc.target/powerpc/vsu/vec-any-eqz-7.c
> patching file gcc/testsuite/gcc.target/xtensa/pr91880.c
> patching file gcc/testsuite/gcc.target/xtensa/pr94584.c
> patching file gcc/testsuite/gcc.target/xtensa/xtensa.exp
> patching file gcc/testsuite/gfortran.dg/dec_structure_28.f90
> patching file gcc/testsuite/gfortran.dg/graphite/vect-pr94043.f90
> patching file gcc/testsuite/gfortran.dg/module_procedure_3.f90
> patching file gcc/testsuite/gfortran.dg/pointer_assign_13.f90
> patching file gcc/testsuite/gfortran.dg/pr91913.f90
> patching file gcc/testsuite/gfortran.dg/pr93364.f90
> patching file gcc/testsuite/gfortran.dg/pr93484_1.f90
> patching file gcc/testsuite/gfortran.dg/pr93484_2.f90
> patching file gcc/testsuite/gfortran.dg/pr93498_1.f90
> patching file gcc/testsuite/gfortran.dg/pr93498_2.f90
> patching file gcc/testsuite/gfortran.dg/pr93686_1.f90
> patching file gcc/testsuite/gfortran.dg/pr93686_2.f90
> patching file gcc/testsuite/gfortran.dg/pr93686_3.f90
> patching file gcc/testsuite/gfortran.dg/pr93686_4.f90
> patching file gcc/testsuite/gfortran.dg/pr94030_1.f90
> patching file gcc/testsuite/gfortran.dg/pr94030_2.f90
> patching file gcc/testsuite/gfortran.dg/pr94329.f90
> patching file gcc/testsuite/gfortran.dg/warn_unused_dummy_argument_6.f90
> patching file gcc/tree-if-conv.c
> patching file gcc/tree-inline.c
> patching file gcc/tree-loop-distribution.c
> patching file gcc/tree-nested.c
> patching file gcc/tree-object-size.c
> patching file gcc/tree-pretty-print.c
> patching file gcc/tree-pretty-print.h
> patching file gcc/tree-sra.c
> patching file gcc/tree-ssa-dse.c
> patching file gcc/tree-ssa-forwprop.c
> patching file gcc/tree-ssa-phiopt.c
> patching file gcc/tree-ssa-pre.c
> patching file gcc/tree-ssa-reassoc.c
> patching file gcc/tree-ssa-sccvn.c
> patching file gcc/tree-tailcall.c
> patching file gcc/tree-vect-loop.c
> patching file gcc/varasm.c
> patching file include/ChangeLog
> patching file include/filenames.h
> patching file libatomic/ChangeLog
> patching file libatomic/config/x86/fenv.c
> patching file libgcc/ChangeLog
> patching file libgcc/config.host
> patching file libgcc/config.in
> patching file libgcc/config/aarch64/lse-init.c
> patching file libgcc/config/aarch64/lse.S
> patching file libgcc/config/aarch64/t-lse
> patching file libgcc/config/i386/sfp-exceptions.c
> patching file libgcc/configure
> patching file libgcc/configure.ac
> patching file libgfortran/ChangeLog
> patching file libgfortran/config/fpu-387.h
> patching file libgomp/ChangeLog
> patching file libgomp/testsuite/libgomp.c++/pr93931.C
> patching file libgomp/testsuite/libgomp.c/pr93566.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-1-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-1.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-2-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-2.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-3-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-3.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-4-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-4.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-5-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-5.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-6-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-6.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-7-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-7.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-8-lib.c
> patching file libgomp/testsuite/libgomp.oacc-c-c++-common/structured-dynamic-lifetimes-8.c
> patching file libstdc++-v3/ChangeLog
> patching file libstdc++-v3/doc/Makefile.am
> patching file libstdc++-v3/doc/Makefile.in
> patching file libstdc++-v3/doc/html/manual/status.html
> patching file libstdc++-v3/doc/xml/manual/status_cxx1998.xml
> patching file libstdc++-v3/doc/xml/manual/status_cxx2011.xml
> patching file libstdc++-v3/doc/xml/manual/status_cxx2014.xml
> patching file libstdc++-v3/doc/xml/manual/status_cxx2017.xml
> patching file libstdc++-v3/include/bits/erase_if.h
> patching file libstdc++-v3/include/bits/fs_path.h
> patching file libstdc++-v3/include/bits/ptr_traits.h
> patching file libstdc++-v3/include/bits/stl_iterator.h
> patching file libstdc++-v3/include/bits/stl_map.h
> patching file libstdc++-v3/include/bits/unordered_map.h
> patching file libstdc++-v3/include/experimental/executor
> patching file libstdc++-v3/include/experimental/socket
> patching file libstdc++-v3/include/std/bit
> patching file libstdc++-v3/include/std/complex
> patching file libstdc++-v3/include/std/deque
> patching file libstdc++-v3/include/std/execution
> patching file libstdc++-v3/include/std/forward_list
> patching file libstdc++-v3/include/std/functional
> patching file libstdc++-v3/include/std/list
> patching file libstdc++-v3/include/std/memory
> patching file libstdc++-v3/include/std/memory_resource
> patching file libstdc++-v3/include/std/string
> patching file libstdc++-v3/include/std/string_view
> patching file libstdc++-v3/include/std/type_traits
> patching file libstdc++-v3/include/std/vector
> patching file libstdc++-v3/include/std/version
> patching file libstdc++-v3/src/c++17/fs_path.cc
> patching file libstdc++-v3/testsuite/20_util/to_address/1_neg.cc
> patching file libstdc++-v3/testsuite/20_util/to_address/debug.cc
> patching file libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc
> patching file libstdc++-v3/testsuite/20_util/unwrap_reference/3.cc
> patching file libstdc++-v3/testsuite/21_strings/basic_string/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/array/element_access/constexpr_c++17.cc
> patching file libstdc++-v3/testsuite/23_containers/array/requirements/constexpr_iter.cc
> patching file libstdc++-v3/testsuite/23_containers/deque/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/forward_list/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/list/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/map/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/set/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/unordered_map/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/unordered_set/erasure.cc
> patching file libstdc++-v3/testsuite/23_containers/vector/erasure.cc
> patching file libstdc++-v3/testsuite/25_algorithms/pstl/feature_test-2.cc
> patching file libstdc++-v3/testsuite/25_algorithms/pstl/feature_test-3.cc
> patching file libstdc++-v3/testsuite/25_algorithms/pstl/feature_test-4.cc
> patching file libstdc++-v3/testsuite/25_algorithms/pstl/feature_test-5.cc
> patching file libstdc++-v3/testsuite/25_algorithms/pstl/feature_test.cc
> patching file libstdc++-v3/testsuite/26_numerics/bit/header-2.cc
> patching file libstdc++-v3/testsuite/26_numerics/bit/header.cc
> patching file libstdc++-v3/testsuite/26_numerics/complex/1.cc
> patching file libstdc++-v3/testsuite/26_numerics/complex/2.cc
> patching file libstdc++-v3/testsuite/27_io/filesystem/operations/last_write_time.cc
> patching file libstdc++-v3/testsuite/27_io/filesystem/path/concat/94063.cc
> patching file libstdc++-v3/testsuite/27_io/filesystem/path/generic/generic_string.cc
> patching file libstdc++-v3/testsuite/27_io/filesystem/path/generic/utf.cc
> patching file libstdc++-v3/testsuite/27_io/filesystem/path/generic/wchar_t.cc
> patching file libstdc++-v3/testsuite/experimental/filesystem/operations/last_write_time.cc
> patching file libstdc++-v3/testsuite/experimental/net/execution_context/make_service.cc
> patching file libstdc++-v3/testsuite/experimental/net/executor/1.cc
> patching file libstdc++-v3/testsuite/lib/libstdc++.exp
> patching file libstdc++-v3/testsuite/tr1/8_c_compatibility/cstdlib/functions.cc
> patching file ltmain.sh
> patching file maintainer-scripts/ChangeLog
> patching file maintainer-scripts/gcc_release
> set -ex; \
> 	cd gcc-*; \
> 	for patch in ../debian/local-patches/[0-9]*.patch; do \
> 		echo Applying patch "$patch"; \
> 		patch -p1 < "$patch"; \
> 	done
> + cd gcc-9.3.0 gcc-source
> + echo Applying patch ../debian/local-patches/0001-add-mforce-l32.patch
> Applying patch ../debian/local-patches/0001-add-mforce-l32.patch
> + patch -p1
> patching file gcc/config/xtensa/constraints.md
> patching file gcc/config/xtensa/xtensa.c
> Hunk #1 succeeded at 1839 (offset 38 lines).
> Hunk #2 succeeded at 2360 (offset 74 lines).
> Hunk #3 succeeded at 2371 (offset 74 lines).
> Hunk #4 succeeded at 2522 (offset 75 lines).
> patching file gcc/config/xtensa/xtensa.md
> Hunk #1 FAILED at 532.
> Hunk #2 FAILED at 569.
> Hunk #3 succeeded at 798 (offset 1 line).
> Hunk #4 succeeded at 808 (offset 1 line).
> Hunk #5 succeeded at 828 (offset 1 line).
> Hunk #6 succeeded at 837 (offset 1 line).
> 2 out of 6 hunks FAILED -- saving rejects to file gcc/config/xtensa/xtensa.md.rej
> patching file gcc/config/xtensa/xtensa.opt
> make[1]: *** [debian/rules:90: debian/stamp/unpack] Error 1

The full build log is available from:
   http://qa-logs.debian.net/2020/05/01/gcc-xtensa-lx106_6_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.