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From 656e495d515b0fc1f01add164aa4bba9a49ceb31 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Tue, 13 Mar 2018 15:20:34 -0400
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Subject: [PATCH 23/25] Call ar in deterministic mode.
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We need the x86_64 and i686 builds of .a's to be the same, and that
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means we need to not have timestamps. Also force the timestamps on disk
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just in case that doesn't work, because RHEL's ar /silently ignores -D/.
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v2: use "ar rvD" not "ar rv -D".
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It's a wonder anybody ever gets these command line options right, if
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"ar rv -D libfoo.a foo.o" doesn't use deterministic mode (or
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complain), but "ar rvD libfoo.a foo.o" does.
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v3: Add a bunch of junk to try to set timestamps to 0 manually
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For some reason I'm still getting timestamps in the .a even though ar seems to
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be invoked correctly. When I do "mock -r rhel-7-build --shell" and run make
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manually, they're fine. Very strange.
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v4: go back to v2, the problem isn't in the make process.
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"ar rDv" works just fine, but /usr/lib/rpm/redhat/brp-strip-static-archive is
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calling "%{__strip} -g $for_each.a", and it's rewriting our binary from
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ts/uid/gid of 0/0/0 to $epoch/$UID/$GID. Awesomely /usr/bin/strip it seems to
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have 3 modes of operation:
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-U: the default, which adds $epoch/$UID/$GID to your binary archive
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instead of just removing stuff. Clearly the Principle of Least
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Surprise is strong here.
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-p: preserve the timestamp from the original .a, but add UID and GID,
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because this is 1980 and people use ar(1) for archiving stuff they
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might want that out of.
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-D: Condescend at you in a command line error and explain that -D both
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is and is not a valid option:
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/usr/bin/strip: invalid option -- 'D'
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Usage: /usr/bin/strip <option(s)> in-file(s)
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Removes symbols and sections from files
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The options are:
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...
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-D --enable-deterministic-archives
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Produce deterministic output when stripping archives
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So I agree that it's invalid, but I think we may be pronouncing that
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second vowel differently. They say in-VAL-id, I say IN-vuh-lid.
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Nobody should ever have to run "strace -ttt -v -f -o make.strace make all",
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just to discover the problem isn't even in there.
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Related: rhbz#1310782
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Signed-off-by: Peter Jones <pjones@redhat.com>
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Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
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---
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Make.defaults | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/Make.defaults b/Make.defaults
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index ed4b60c2423..ba743f17893 100755
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--- a/Make.defaults
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+++ b/Make.defaults
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@@ -177,7 +177,7 @@ CFLAGS += $(ARCH3264) -g -O2 -Wall -Wextra -Werror \
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$(if $(findstring gcc,$(CC)),-fno-merge-all-constants,)
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endif
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-ARFLAGS += -U
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+ARFLAGS := rDv
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ASFLAGS += $(ARCH3264)
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LDFLAGS += -nostdlib --warn-common --no-undefined --fatal-warnings \
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--build-id=sha1
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--
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2.15.0
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