[build] Split stdlib to it's own opam package.

We introduce a new package structure for Coq:

- `coq-core`: Coq's OCaml tools code and plugins
- `coq-stdlib`: Coq's stdlib [.vo files]
- `coq`: meta-package that pulls `coq-{core,stdlib}`

This has several advantages, in particular it allows to install Coq
without the stdlib which is useful in several scenarios, it also open
the door towards a versioning of the stdlib at the package level.

The main user-visible change is that Coq's ML development files now
live in `$lib/coq-core`, for compatibility in the regular build we
install a symlink and support both setups for a while.

Note that plugin developers and even `coq_makefile` should actually
rely on `ocamlfind` to locate Coq's OCaml libs as to be more robust.

There is a transient state where we actually look for both
`$coqlib/plugins` and `$coqlib/../coq-core/plugins` as to support
the non-ocamlfind plus custom variables.

This will be much improved once #13617 is merged (which requires this
PR first), then, we will introduce a `coq.boot` library so finally
`coqdep`, `coqchk`, etc... can share the same path setup code.

IMHO the plan should work fine.

4 files changed, 10 insertions, 5 deletions

diff --git a/test-suite/Makefile b/test-suite/Makefile
index 245c717d42..2a2f62e23f 100644
--- a/test-suite/Makefile
+++ b/test-suite/Makefile
@@ -46,7 +46,11 @@ BIN := $(ROOT)/bin/
 
 COQLIB?=
 ifeq ($(COQLIB),)
+ ifeq ($(LOCAL),true)
   COQLIB := $(shell ocaml ocaml_pwd.ml ..)
+ else
+  COQLIB := $(shell ocaml ocaml_pwd.ml $(COQLIBINSTALL))
+ endif
 endif
 endif # exists ../_build
 export COQLIB
@@ -320,7 +324,7 @@ unit-tests: $(UNIT_LOGFILES)
 # Build executable, run it to generate log file
 unit-tests/%.ml.log: unit-tests/%.ml unit-tests/src/$(UNIT_LINK)
 	$(SHOW) 'TEST      $<'
-	$(HIDE)$(OCAMLBEST) -linkall -linkpkg -package coq.toplevel,ounit2 \
+	$(HIDE)$(OCAMLBEST) -linkall -linkpkg -package coq-core.toplevel,ounit2 \
 	     -I unit-tests/src $(UNIT_LINK) $< -o $<.test;
 	$(HIDE)./$<.test
 
diff --git a/test-suite/coq-makefile/timing/precomputed-time-tests/007-no-output-sync/time-of-build.log.in b/test-suite/coq-makefile/timing/precomputed-time-tests/007-no-output-sync/time-of-build.log.in
index 47d0e09e1a..258eb04271 100644
--- a/test-suite/coq-makefile/timing/precomputed-time-tests/007-no-output-sync/time-of-build.log.in
+++ b/test-suite/coq-makefile/timing/precomputed-time-tests/007-no-output-sync/time-of-build.log.in
@@ -744,7 +744,7 @@ CONTRIBUTING.md
 CREDITS
 INSTALL.md
 LICENSE
-META.coq.in
+META.coq-core.in
 Makefile
 Makefile.build
 Makefile.checker
@@ -5626,4 +5626,4 @@ ValueError: too many values to unpack
 Makefile.ci:90: recipe for target 'ci-metacoq' failed
 make: *** [ci-metacoq] Error 1
 section_end:1598965182:build_script
section_start:1598965182:after_script
section_end:1598965184:after_script
section_start:1598965184:upload_artifacts_on_failure
section_end:1598965189:upload_artifacts_on_failure
ERROR: Job failed: exit code 1
-
\ No newline at end of file
+
diff --git a/test-suite/dune b/test-suite/dune
index 1864153021..09597fc864 100644
--- a/test-suite/dune
+++ b/test-suite/dune
@@ -35,7 +35,8 @@
    ; For the changelog test
    ../config/coq_config.py
    (source_tree doc/changelog)
-   (package coq)
+   (package coq-core)
+   (package coq-stdlib)
    ; For fake_ide
    (package coqide-server)
    (source_tree .))
diff --git a/test-suite/misc/coq_environment.sh b/test-suite/misc/coq_environment.sh
index 667d11f89e..6f7b11c8f1 100755
--- a/test-suite/misc/coq_environment.sh
+++ b/test-suite/misc/coq_environment.sh
@@ -16,7 +16,7 @@ EOT
 cp $BIN/coqc .
 cp $BIN/coq_makefile .
 mkdir -p overridden/tools/
-cp $COQLIB/tools/CoqMakefile.in overridden/tools/
+cp $COQLIB/tools/CoqMakefile.in overridden/tools/ || cp $COQLIB/../coq-core/tools/CoqMakefile.in overridden/tools/
 
 unset COQLIB
 N=`./coqc -config | grep COQLIB | grep /overridden | wc -l`