From 8e8353395fef722474cd3ffae8d6dc9acd412144 Mon Sep 17 00:00:00 2001
From: Ralf Jung <jung@mpi-sws.org>
Date: Tue, 6 Oct 2020 17:01:33 +0200
Subject: [PATCH] update build system

---
 .gitignore            |  2 +-
 Makefile              | 50 +++++++++++++++++++++++++------------------
 opam => coq-iris.opam |  1 -
 3 files changed, 30 insertions(+), 23 deletions(-)
 rename opam => coq-iris.opam (97%)

diff --git a/.gitignore b/.gitignore
index 5c8d7df69..bfd0941de 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,7 @@
 *.bak
 .coqdeps.d
 .coq-native/
-build-dep/
+builddep/
 Makefile.coq
 Makefile.coq.conf
 *.crashcoqide
diff --git a/Makefile b/Makefile
index 163ff30fb..69d14288d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,18 +1,22 @@
+# Default target
+all: Makefile.coq
+	+@make -f Makefile.coq all
+.PHONY: all
+
 # Permit local customization
 -include Makefile.local
 
 # Forward most targets to Coq makefile (with some trick to make this phony)
 %: Makefile.coq phony
+	@#echo "Forwarding $@"
 	+@make -f Makefile.coq $@
-
-all: Makefile.coq
-	+@make -f Makefile.coq all
-.PHONY: all
+phony: ;
+.PHONY: phony
 
 clean: Makefile.coq
 	+@make -f Makefile.coq clean
 	find theories tests exercises solutions \( -name "*.d" -o -name "*.vo" -o -name "*.vo[sk]" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete || true
-	rm -f Makefile.coq .lia.cache
+	rm -f Makefile.coq .lia.cache builddep/*
 .PHONY: clean
 
 # Create Coq Makefile.
@@ -20,27 +24,31 @@ Makefile.coq: _CoqProject Makefile
 	"$(COQBIN)coq_makefile" -f _CoqProject -o Makefile.coq $(EXTRA_COQFILES)
 
 # Install build-dependencies
-build-dep/opam: opam Makefile
-	@echo "# Creating build-dep package."
-	@mkdir -p build-dep
-	@sed <opam -E 's/^(build|install|remove):.*/\1: []/; s/^name: *"(.*)" */name: "\1-builddep"/' >build-dep/opam
-	@fgrep builddep build-dep/opam >/dev/null || (echo "sed failed to fix the package name" && exit 1) # sanity check
+OPAMFILES=$(wildcard *.opam)
+BUILDDEPFILES=$(addsuffix -builddep.opam, $(addprefix builddep/,$(basename $(OPAMFILES))))
+
+builddep/%-builddep.opam: %.opam Makefile
+	@echo "# Creating builddep package for $<."
+	@mkdir -p builddep
+	@sed <$< -E 's/^(build|install|remove):.*/\1: []/; s/"(.*)"(.*= *version.*)$$/"\1-builddep"\2/;' >$@
 
-build-dep: build-dep/opam phony
+builddep-opamfiles: $(BUILDDEPFILES)
+.PHONY: builddep-opamfiles
+
+builddep: builddep-opamfiles
 	@# We want opam to not just instal the build-deps now, but to also keep satisfying these
 	@# constraints.  Otherwise, `opam upgrade` may well update some packages to versions
 	@# that are incompatible with our build requirements.
 	@# To achieve this, we create a fake opam package that has our build-dependencies as
 	@# dependencies, but does not actually install anything itself.
-	@echo "# Installing build-dep package."
-	@opam install $(OPAMFLAGS) build-dep/
+	@echo "# Installing builddep packages."
+	@opam install $(OPAMFLAGS) $(BUILDDEPFILES)
+.PHONY: builddep
 
-# Some files that do *not* need to be forwarded to Makefile.coq
-Makefile: ;
-_CoqProject: ;
-opam: ;
-Makefile.local: ;
+# Backwards compatibility target
+build-dep: builddep
+.PHONY: build-dep
 
-# Phony wildcard targets
-phony: ;
-.PHONY: phony
+# Some files that do *not* need to be forwarded to Makefile.coq.
+# ("::" lets Makefile.local overwrite this.)
+Makefile Makefile.local _CoqProject $(OPAMFILES):: ;
diff --git a/opam b/coq-iris.opam
similarity index 97%
rename from opam
rename to coq-iris.opam
index d8d6d73dc..87e22af29 100644
--- a/opam
+++ b/coq-iris.opam
@@ -1,5 +1,4 @@
 opam-version: "2.0"
-name: "coq-iris"
 maintainer: "Ralf Jung <jung@mpi-sws.org>"
 authors: "The Iris Team"
 license: "BSD-3-Clause"
-- 
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