beamPackages: turn on debug_info for beam packages

This allows you to turn on debug infor for all the beam packages in the
system with a single change at the top level. This is required for
debugging and dialyzer work. It also allows you to switch it on on a
package by package basis.

pkgs/development/beam-modules/build-erlang-mk.nix

@@ -1,4 +1,4 @@
-{ stdenv, writeText, erlang, perl, which, gitMinimal, wget }:
+{ stdenv, writeText, erlang, perl, which, gitMinimal, wget, lib }:
 
 { name, version
 , src
@@ -11,11 +11,14 @@
 , buildPhase ? null
 , configurePhase ? null
 , meta ? {}
+, enableDebugInfo ? false
 , ... }@attrs:
 
 with stdenv.lib;
 
 let
+  debugInfoFlag = lib.optionalString (enableDebugInfo || erlang.debugInfo) "+debug_info";
+
   shell = drv: stdenv.mkDerivation {
           name = "interactive-shell-${drv.name}";
           buildInputs = [ drv ];
@@ -55,7 +58,7 @@ let
     then ''
         runHook preBuild
 
-        make SKIP_DEPS=1
+        make SKIP_DEPS=1 ERL_OPTS="$ERL_OPTS ${debugInfoFlag}"
 
         runHook postBuild
     ''

pkgs/development/beam-modules/build-mix.nix

@@ -1,4 +1,4 @@
-{ stdenv, writeText, elixir, erlang, hexRegistrySnapshot, hex }:
+{ stdenv, writeText, elixir, erlang, hexRegistrySnapshot, hex, lib }:
 
 { name
 , version
@@ -12,11 +12,15 @@
 , buildPhase ? null
 , configurePhase ? null
 , meta ? {}
+, enableDebugInfo ? false
 , ... }@attrs:
 
 with stdenv.lib;
 
 let
+
+  debugInfoFlag = lib.optionalString (enableDebugInfo || elixir.debugInfo) "--debug-info";
+
   shell = drv: stdenv.mkDerivation {
           name = "interactive-shell-${drv.name}";
           buildInputs = [ drv ];
@@ -58,7 +62,7 @@ let
         export HEX_HOME=`pwd`
         export MIX_ENV=prod
 
-        MIX_ENV=prod mix compile --debug-info --no-deps-check
+        MIX_ENV=prod mix compile ${debugInfoFlag} --no-deps-check
 
         runHook postBuild
     ''

pkgs/development/beam-modules/build-rebar3.nix

@@ -1,5 +1,5 @@
 { stdenv, writeText, erlang, rebar3, openssl, libyaml,
-  pc, buildEnv }:
+  pc, buildEnv, lib }:
 
 { name, version
 , src
@@ -11,11 +11,14 @@
 , buildPhase ? null
 , configurePhase ? null
 , meta ? {}
+, enableDebugInfo ? false
 , ... }@attrs:
 
 with stdenv.lib;
 
 let
+  debugInfoFlag = lib.optionalString (enableDebugInfo || erlang.debugInfo) "debug-info";
+
   ownPlugins = buildPlugins ++ (if compilePorts then [pc] else []);
 
   shell = drv: stdenv.mkDerivation {
@@ -51,7 +54,7 @@ let
     configurePhase = if configurePhase == null
     then ''
       runHook preConfigure
-      ${erlang}/bin/escript ${rebar3.bootstrapper}
+      ${erlang}/bin/escript ${rebar3.bootstrapper} ${debugInfoFlag}
       runHook postConfigure
     ''
     else configurePhase;