Enforce use of a custom Nim compiler

Use a custom Nim compiler at '/usr/local/genode-nim' that can be built
with a makefile at 'tool/tool_chain_nim'.

Fix #2545

repos/base/mk/generic.mk

@@ -94,11 +94,16 @@ ifeq ($(NIM_CPU),)
 $(warning NIM_CPU not defined for any of the following SPECS: $(SPECS))
 else
 
+ifeq ($(wildcard $(NIM)),)
+$(error Nim compiler not found at $(NIM), see the 'tool/tool_chain_nim' script)
+endif
+
 NIM_MAKEFILES := $(foreach X,$(SRC_NIM),$(X).mk)
+
 NIM_ARGS  = --compileOnly --os:genode --cpu:$(NIM_CPU)
 NIM_ARGS += --verbosity:0 --hint[Processing]:off --nimcache:.
 NIM_ARGS += --noCppExceptions
-NIM_ARGS += $(foreach X,$(call select_from_repositories,include/nim),--path:$(X))
+NIM_ARGS += $(foreach DIR,$(foreach REP,$(REPOSITORIES),$(wildcard $(REP)/include/nim)), --path:$(DIR))
 NIM_ARGS += $(NIM_OPT)
 
 # Generate the C++ sources and compilation info

repos/base/mk/global.mk

@@ -55,7 +55,7 @@ HOST_CC  = $(CUSTOM_HOST_CC)
 #
 # Nim toolchain
 #
-NIM ?= nim
+NIM ?= /usr/local/genode-nim/bin/nim
 
 #
 # JSON parsing utility

repos/libports/ports/nim-csources.hash

@@ -0,0 +1 @@
+83abcf5efae001cbe80d473b18d8e5314f1e1500

repos/libports/ports/nim-csources.port

@@ -0,0 +1,11 @@
+LICENSE   := MIT
+VERSION   := 0.17.2
+DOWNLOADS := nim-csources.archive
+
+OWNER = nim-lang
+REPO  = csources
+REV = 08c310bb8277611711ca06619526ec08f1feffaf
+
+URL(nim-csources) := https://github.com/$(OWNER)/$(REPO)/archive/$(REV).tar.gz
+SHA(nim-csources) := 659cbaf6081ede035342dbb05c70fd9184d1446b
+DIR(nim-csources) := .

repos/libports/ports/nim.hash

@@ -0,0 +1 @@
+11b0318a9b77aacfb46ec52a5d4df36bce2fd954

repos/libports/ports/nim.port

@@ -0,0 +1,11 @@
+LICENSE   := MIT
+VERSION   := 0.17.2
+DOWNLOADS := nim.archive
+
+OWNER := ehmry
+REPO  := nim
+REV := c129528e8eff8ec8b84664d0b64e8ca89745df2a
+
+URL(nim) := https://github.com/$(OWNER)/$(REPO)/archive/$(REV).tar.gz
+SHA(nim) := 5350686dfb42a871f6bdbbd634e30b68b39b9d46
+DIR(nim) := .

repos/libports/run/nim.run

@@ -32,7 +32,7 @@ set config {
 		<resource name="RAM" quantum="1M"/>
 		<provides> <service name="Rtc"/> </provides>
 	</start>
-	<start name="test-nim">
+	<start name="test-nim" caps="128">
 		<resource name="RAM" quantum="10M"/>
 		<config>
 			<vfs>

repos/libports/src/test/nim/main.nim

@@ -110,3 +110,4 @@ suite "garbage collector":
   echo GC_getStatistics()
 
 echo "done"
+quit 0

tool/tool_chain_nim

@@ -0,0 +1,73 @@
+#!/usr/bin/make -f
+#
+# \brief  Tool for preparing the Nim tool-chain for the Genode OS Framework
+# \author Emery Hemingway
+# \date   2017-07-04
+#
+
+help:
+	@$(ECHO)
+	@$(ECHO) "Build Nim compiler for the Genode OS Framework tool chain"
+	@$(ECHO)
+	@$(ECHO) "--- available commands ---"
+	@$(ECHO) "build         - build Nim compiler"
+	@$(ECHO) "clean         - clean everything except contrib sources"
+	@$(ECHO) "install       - copy Nim compiler and standard library to '$(INSTALL_LOCATION)'"
+	@$(ECHO)
+
+.PHONY: build help install
+
+GENODE_DIR ?= $(realpath $(dir $(firstword $(MAKEFILE_LIST)))/..)
+include $(GENODE_DIR)/tool/ports/mk/common.inc
+
+LOCAL_INSTALL_LOCATION ?= /usr/local
+INSTALL_LOCATION := $(LOCAL_INSTALL_LOCATION)/genode-nim
+
+NIM_CONTRIB_DIR = $(shell $(GENODE_DIR)/tool/ports/current nim)
+NIM_CSOURCES_CONTRIB_DIR = $(shell $(GENODE_DIR)/tool/ports/current nim-csources)
+
+BUILD_DIR = build/nim
+
+build: $(BUILD_DIR)/bin/nim $(BUILD_DIR)/koch
+
+$(BUILD_DIR)/bin/nim: $(BUILD_DIR)/koch
+	@$(ECHO) "$(BRIGHT_COL)building Nim compiler...$(DEFAULT_COL)"
+	$(VERBOSE)cd $(BUILD_DIR) && ./koch boot -d:release --verbosity:0 --hint[Processing]:off
+
+$(BUILD_DIR)/koch: $(BUILD_DIR)/koch.nim $(BUILD_DIR)/.bootstrap.tag
+	@$(ECHO) "$(BRIGHT_COL)building Koch...$(DEFAULT_COL)"
+	$(VERBOSE)cd $(BUILD_DIR) && ./bin/nim c koch
+
+$(BUILD_DIR)/.bootstrap.tag: $(BUILD_DIR)/csources
+	@$(ECHO) "$(BRIGHT_COL)building bootstrap compiler...$(DEFAULT_COL)"
+	$(VERBOSE)cd $(BUILD_DIR)/csources && sh build.sh
+	@touch $@
+
+$(BUILD_DIR)/csources: $(NIM_CSOURCES_CONTRIB_DIR) $(BUILD_DIR)/koch.nim
+	@$(ECHO) "$(BRIGHT_COL)copying Nim C sources...$(DEFAULT_COL)"
+	$(VERBOSE)mkdir -p $@
+	$(VERBOSE)cp -a $</* $@
+
+$(BUILD_DIR)/koch.nim: $(NIM_CONTRIB_DIR)
+	@$(ECHO) "$(BRIGHT_COL)copying Nim sources...$(DEFAULT_COL)"
+	$(VERBOSE)mkdir -p $(BUILD_DIR)
+	$(VERBOSE)cp -a $</* $(BUILD_DIR)
+
+$(NIM_CONTRIB_DIR):
+	@$(ECHO) "$(BRIGHT_COL)preparing Nim...$(DEFAULT_COL)"
+	$(VERBOSE)$(GENODE_DIR)/tool/ports/prepare_port nim
+
+$(NIM_CSOURCES_CONTRIB_DIR):
+	@$(ECHO) "$(BRIGHT_COL)preparing Nim C sources...$(DEFAULT_COL)"
+	$(VERBOSE)$(GENODE_DIR)/tool/ports/prepare_port nim-csources
+
+copy: build
+	@$(ECHO) "$(BRIGHT_COL)installing Nim to '$(INSTALL_LOCATION)'...$(DEFAULT_COL)"
+	$(VERBOSE)rm -r $(BUILD_DIR)/csources
+	$(VERBOSE)sudo mkdir -p $(INSTALL_LOCATION)
+	$(VERBOSE)sudo cp -a $(BUILD_DIR)/* $(INSTALL_LOCATION)
+
+install: copy
+
+clean:
+	$(VERBOSE)rm -rf $(BUILD_DIR)