• ReproducibleBuilds
• Base

Most of FreeBSD builds "reproducibly" (aka. with two builds producing identical binaries) but there are a few deviations from this. It would be great if these could be eliminated.

Reproducible Builds

The Reproducible Builds website has more information on the Reproducible Builds initiative, including the Reproducible Builds Definition.

Known problem files in the base system

/boot/{loader, pxeboot, userboot.so, zfsloader}

Contain build time/date. Option to disable added in r310268.

/boot/kernel/kernel

Contains time/date, user, and host. See https://reviews.freebsd.org/D4347. Beginning of fix in r310112. Option to disable added in r310128.

Kernel modules with full paths (in non-debug sections)

Reported by the Debian GNU/kFreeBSD folks. Specifying .PATH: $(.CURDIR)/foo/bar in a Makefile expands ${.CURDIR} to an absolute path. Debian used relative paths instead: .PATH foo/bar. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=757629

From the Debian report,

* modules are built with -DKLD_MODULE
* KLD_MODULE causes LOCK_DEBUG to be defined (sys/lock.h)
* LOCK_DEBUG causes mtx_assert() to use __FILE__ in debug messages (sys/mutex.h)

Triage required

The build option survey (from phk@, recently resurrected by bz@) demonstrated possible non-reproducibility in a number of files unrelated to the option being tested - for example:

                usr/lib/debug/boot/kernel/aacraid.ko.debug file size=429288
                usr/lib/debug/boot/kernel/aacraid.ko.debug file size=429280
                usr/lib/debug/boot/kernel/acpi_asus.ko.debug file size=72032
                usr/lib/debug/boot/kernel/acpi_asus.ko.debug file size=72024

Failures appear to be a variety of different kernel module .debug files.

Different version of yacc used in build

Perhaps a build race?

--- obj-repro.a/sparc64.sparc64/scratch/tmp/emaste/freebsd/tmp/scratch/tmp/emaste/freebsd/usr.sbin/config/y.tab.c       2016-12-20 14:13:03.000000000 -0500
+++ obj-repro.b/sparc64.sparc64/scratch/tmp/emaste/freebsd/tmp/scratch/tmp/emaste/freebsd/usr.sbin/config/y.tab.c       2016-12-21 07:56:10.000000000 -0500
@@ -5,7 +5,7 @@
 #define YYBYACC 1
 #define YYMAJOR 1
 #define YYMINOR 9
-#define YYPATCH 20161202
+#define YYPATCH 20160324
 
 #define YYEMPTY        (-1)
 #define yyclearin      (yychar = YYEMPTY)
...

Resolved issues