From 8b0aff6608c42bf3c04381697b9ab57ffbd93456 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Wed, 7 Dec 2016 15:40:45 +0100
Subject: Add option 'deterministic' for reproducible builds

Add the option 'deterministic' to make it easier to
achieve reproducible builds.

This option omits the {options,...} and {source,...} tuples in
M:module_info(compile), because those options may contain absolute
paths.

The author of ERL-310 suggested that only compiler options that
may contain absolute paths (such as {i,...}) should be excluded. But I
find it confusing to keep only some options.

Alternatives considered: Always omitting this information. Since this
information has been available for a long time, that would probably
break some workflows. As an example that some people care about
{source,...}, 2d785c07fbf9 made it possible to give a compiler option
to set {source,...}.

ERL-310
---
 lib/compiler/doc/src/compile.xml | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib/compiler/doc/src')

diff --git a/lib/compiler/doc/src/compile.xml b/lib/compiler/doc/src/compile.xml
index e93da85f6c..bd488a39a5 100644
--- a/lib/compiler/doc/src/compile.xml
+++ b/lib/compiler/doc/src/compile.xml
@@ -176,6 +176,14 @@
               <seealso marker="stdlib:beam_lib#debug_info">beam_lib(3)</seealso>.</p>
           </item>
 
+          <tag><c>deterministic</c></tag>
+          <item>
+            <p>Omit the <c>options</c> and <c>source</c> tuples in
+	    the list returned by <c>Module:module_info(compile)</c>.
+	    This option will make it easier to achieve reproducible builds.
+	    </p>
+          </item>
+
           <tag><c>makedep</c></tag>
           <item>
             <p>Produces a Makefile rule to track headers dependencies.
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