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authorAndré Draszik <andre.draszik@jci.com>2018-04-25 16:06:46 +0100
committerRichard Leitner <richard.leitner@skidata.com>2018-06-19 09:55:05 +0200
commit42c47497cf51deab3c9946c2e9e10d4d222e9dc9 (patch)
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docs: add bootstrap-flow.txt
Summarises the bootstrap of the java envrionment, rather than having to find this described in some wiki page that was copied over from OE-classic and never updated. Signed-off-by: André Draszik <andre.draszik@jci.com> Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
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+* first jikes-native is compiled
+ * a Java 1.4-capable compiler that does not need a runtime or
+ (strictly) a class library to work
+* jikes-initial-native is a wrapper around it
+
+* with this compiler we compile the initial (preliminary)
+ runtime (package virtual/java-initial-native)
+ * virtual/java-initial-native can be: cacao-initial-native (0.98)
+ or jamvm-initial-native (1.4.5)
+ * cacao is preferred, as it has a JIT, but doesn't compile
+ on all hosts
+ * cacao-initial-native and jamvm-initial-native both need
+ classpath-initial-native (0.93) and jikes-initial-native
+
+* now libecj-bootstrap-native is built
+ * this needs jikes-initial-native virtual/java-initial-native
+* now ecj-initial is built
+ * this needs libecj-bootstrap-native and
+ virtual/java-initial-native during runtime
+ * at that point we have a 1.5-capable compiler (ecj-initial)
+ running on a Java 1.4 compatible VM (cacao-inital-native
+ or jamvm-initial-native)
+
+* with this compiler (ecj-initial), we compile the final runtime
+ and compiler (virtual/java-native and virtual/javac-native)
+ * virtual/java-native can be: cacao-native (1.6.1) or
+ jamvm-native (2.0.0~pre)
+ * cacao vs jamvm as above
+ * cacao-native and jamvm-native both need
+ classpath-initial-native (0.93) and classpath-native (0.99)
+ and ecj-initial-native and virtual/java-initial-native
+ * virtual/javac-native can be: ecj-bootstrap-native
+ * ecj-bootstrap-native needs libecj-bootstrap-native
+ and virtual/java-native
+ * at that point we have a 1.5-capable compiler (ecj-bootstrap-native)
+ running on a Java 1.5 compatible VN (cacao-native or
+ jamvm-native)