Source: linux Severity: normal Tags: patch User: reproducible-builds@lists.alioth.debian.org Usertags: buildpath X-Debbugs-Cc: reproducible-bugs@lists.alioth.debian.org The build path is embedded in various binaries: https://tests.reproducible-builds.org/debian/rb-pkg/unstable/i386/diffoscope-results/linux.html /usr/sbin/bpftool /build/1st/linux-6.1.20/tools/lib/bpf/libbpf.c:805 vs. /build/2/linux-6.1.20/2nd/tools/lib/bpf/libbpf.c:805 This *seems* like a regression from earlier versions, though I have not tracked down when the tools started embedding the build paths... The attached patches fix this for some of the binary packages and corresponding dbgsym packages (bpftool, hyperv-daemons, *cpupower*) by explicitly passing the -ffile-prefix-map argument (to avoid embedding the build path) in the CFLAGS or EXTRA_CFLAGS variables in debian/rules.d/. I unsuccessfully tried applying similar patches for other tools packages (rtla, perf, usbip) but was not able to convince the tools to take the passed flags... It would, of course, be better to figure out a way to get the various tools to respect the default CFLAGS, as -ffile-prefix-map is included in the default CFLAGS. Unfortunately, these patches do not fix all reproducibility issues, but applying these patches could reduce some of the noise and make it easier to debug the remaining issues. Thanks for maintaining linux! live well, vagrant
From 7dcacfb3415c5ec4caea8933dd2c12fb401bea52 Mon Sep 17 00:00:00 2001 From: Vagrant Cascadian <vagrant@reproducible-builds.org> Date: Tue, 28 Mar 2023 14:49:01 -0700 Subject: [PATCH 1/4] debian/rules.d/tools/bpf/bpftool/Makefile: Pass -ffile-prefix-map via EXTRA_CFLAGS. --- debian/rules.d/tools/bpf/bpftool/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/debian/rules.d/tools/bpf/bpftool/Makefile b/debian/rules.d/tools/bpf/bpftool/Makefile index 17c27c104..9d3017e42 100644 --- a/debian/rules.d/tools/bpf/bpftool/Makefile +++ b/debian/rules.d/tools/bpf/bpftool/Makefile @@ -5,7 +5,7 @@ MAKE_BPFTOOL += prefix=/usr MAKE_BPFTOOL += mandir=/usr/share/man MAKE_BPFTOOL += V=1 MAKE_BPFTOOL += ARCH=$(KERNEL_ARCH) -MAKE_BPFTOOL += EXTRA_CFLAGS='$(CFLAGS) $(CPPFLAGS)' +MAKE_BPFTOOL += EXTRA_CFLAGS='$(CFLAGS) $(CPPFLAGS) -ffile-prefix-map=$(top_srcdir)=.' MAKE_BPFTOOL += EXTRA_LDFLAGS='$(LDFLAGS)' # dynamically linking with libbfd is not allowed in Debian -- 2.39.2
From cb11c490a41a0afbdeb00f272fa8a71cc3c69be1 Mon Sep 17 00:00:00 2001 From: Vagrant Cascadian <vagrant@reproducible-builds.org> Date: Tue, 28 Mar 2023 15:48:05 -0700 Subject: [PATCH 2/4] debian/rules.d/tools/power/cpupower/Makefile: Pass -ffile-prefix-map via MAKE_CPUPOWER CFLAGS. --- debian/rules.d/tools/power/cpupower/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/debian/rules.d/tools/power/cpupower/Makefile b/debian/rules.d/tools/power/cpupower/Makefile index e4bd5202d..28ccf7004 100644 --- a/debian/rules.d/tools/power/cpupower/Makefile +++ b/debian/rules.d/tools/power/cpupower/Makefile @@ -1,6 +1,6 @@ include $(top_rulesdir)/Makefile.inc -MAKE_CPUPOWER := CFLAGS='$(CFLAGS) $(CPPFLAGS)' LDFLAGS='$(LDFLAGS)' $(MAKE) O=$(CURDIR) CPUFREQ_BENCH=false V=true mandir=/usr/share/man +MAKE_CPUPOWER := CFLAGS='$(CFLAGS) -ffile-prefix-map=$(top_srcdir)=. $(CPPFLAGS)' LDFLAGS='$(LDFLAGS)' $(MAKE) O=$(CURDIR) CPUFREQ_BENCH=false V=true mandir=/usr/share/man MAKE_CPUPOWER += DEBUG=$(if $(filter noopt,$(DEB_BUILD_OPTIONS)),true,) -- 2.39.2
From 2cf67982526879524548e37df0efac5f8b37e0d3 Mon Sep 17 00:00:00 2001 From: Vagrant Cascadian <vagrant@reproducible-builds.org> Date: Tue, 28 Mar 2023 16:57:01 -0700 Subject: [PATCH 3/4] debian/rules.d/tools/power/x86/*/Makefile: Add -ffile-prefix-map to CFLAGS. --- debian/rules.d/tools/power/x86/turbostat/Makefile | 2 ++ debian/rules.d/tools/power/x86/x86_energy_perf_policy/Makefile | 2 ++ 2 files changed, 4 insertions(+) diff --git a/debian/rules.d/tools/power/x86/turbostat/Makefile b/debian/rules.d/tools/power/x86/turbostat/Makefile index eb5124d3a..019fcbde6 100644 --- a/debian/rules.d/tools/power/x86/turbostat/Makefile +++ b/debian/rules.d/tools/power/x86/turbostat/Makefile @@ -7,3 +7,5 @@ include $(top_rulesdir)/Makefile.inc CPPFLAGS += -I"$(top_srcdir)/tools/include" -DMSRHEADER='"$(top_srcdir)/arch/x86/include/asm/msr-index.h"' -DINTEL_FAMILY_HEADER='"$(top_srcdir)/arch/x86/include/asm/intel-family.h"' LDLIBS += -lcap -lrt + +CFLAGS += -ffile-prefix-map=$(top_srcdir)=. diff --git a/debian/rules.d/tools/power/x86/x86_energy_perf_policy/Makefile b/debian/rules.d/tools/power/x86/x86_energy_perf_policy/Makefile index b9ec56c89..a86da0f1e 100644 --- a/debian/rules.d/tools/power/x86/x86_energy_perf_policy/Makefile +++ b/debian/rules.d/tools/power/x86/x86_energy_perf_policy/Makefile @@ -5,3 +5,5 @@ installdir = /usr/sbin include $(top_rulesdir)/Makefile.inc CPPFLAGS += -I"$(top_srcdir)/tools/include" -DMSRHEADER='"$(top_srcdir)/arch/x86/include/asm/msr-index.h"' + +CFLAGS += -ffile-prefix-map=$(top_srcdir)=. -- 2.39.2
From 36e49dee5adf4ba4b566cb87bea35dd0158f8ff3 Mon Sep 17 00:00:00 2001 From: Vagrant Cascadian <vagrant@reproducible-builds.org> Date: Tue, 28 Mar 2023 21:44:05 -0700 Subject: [PATCH 4/4] debian/rules.d/tools/hv/Makefile: Add -ffile-prefix-map to CFLAGS. --- debian/rules.d/tools/hv/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/debian/rules.d/tools/hv/Makefile b/debian/rules.d/tools/hv/Makefile index 5f00f5513..ed8ed967d 100644 --- a/debian/rules.d/tools/hv/Makefile +++ b/debian/rules.d/tools/hv/Makefile @@ -14,4 +14,6 @@ installdir = /usr/sbin include $(top_rulesdir)/Makefile.inc +CFLAGS += -ffile-prefix-map=$(top_srcdir)=. + endif -- 2.39.2
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