Original bug ID: 4422
Reporter: jessicah
Assigned to: @xclerc
Status: closed (set by @xavierleroy on 2015-12-11T18:20:55Z)
Resolution: unable to duplicate
Priority: normal
Severity: major
Version: 3.10.0
Target version: 4.01.0+dev
Category: -for ocamlbuild use https://github.com/ocaml/ocamlbuild/issues

Bug description

This is probably user-error, as I can't find quite enough documentation on ocamlbuild, being how new and experimental it is... ;-)

I have a myocamlbuild plugin that replaces the link step using ocamlopt to a custom command using ld, but sometimes it doesn't perform this part of the build even if dependencies were rebuilt.

My ocamlbuild plugin looks something like:

let ld_linker tags deps out =
Cmd (S [A"ld"; A"-nostdlib"; A"-export-dynamic"; A"-T";
A"../libkernel/kernel.lds"; flags_of_pathname out;
A"-s"; P"startup/stage1.o"; P"startup/stage2.o";
P"libasmrun/libasmrun.a";
atomize_paths deps; T tags; A"-o"; Px out]);;

let ld_native_link x =
OComp.link_gen "cmx" "cmxa" "a" ["o"; "cmi"] ld_linker
(fun tags -> tags++"ocaml"++"link"++"native"++"program") x;;

rule "cmx* & o* -> native"
~tags:["ocaml"; "native"; "program"]
~prod:"%.native"
~deps:["%.cmx"; "%.o"; "%.startup"]
~insert:`top
(ld_native_link "%.cmx" "%.native");;

Pathname.define_context "" ["snowflake"; "snowflake/net"];;

In the root dir, I have snowflake.ml, that calls a function in a module, snowflake/soundblaster16.ml.

Often times, when I make changes to soundblaster16.ml and run ocamlbuild, it will rebuild soundblaster16.ml, but it doesn't rebuild snowflake.native.

I often end up having to clean my tree and start building from scratch to get a successful build, which is frustrating. Things like changing the values of constants always fails to trigger a rebuild of snowflake.native.

Thanks,

Jessica