RFR(S): 8056246 : Fix AIX build after the Modular Source Code change 8054834

[Volker Simonis]

Hi,

could somebody please review the following small changes to fix the
AIX build after the Modular Source Code change 8054834. I've also done
a little cleanup which is detailed below:

http://cr.openjdk.java.net/~simonis/webrevs/8056246/
https://bugs.openjdk.java.net/browse/JDK-8056246

make/lib/Awt2dLibraries.gmk

LIBAWT_CFLAGS contains quite some duplicate include parameters which
can be removed.

-I$(JDK_TOPDIR)/src/java.desktop/$(OPENJDK_TARGET_OS_API_DIR)/native/common/sun/awt
isn't required because the path
$(JDK_TOPDIR)/src/java.desktop/$(OPENJDK_TARGET_OS_API_DIR)/native/common/sun/awt
is already part of LIBAWT_DIRS and the corresponding include parameter
is already generated by $(addprefix -I, $(shell find $(LIBAWT_DIRS)
-type d))
$(foreach dir, $(LIBAWT_DIRS), -I$(dir)) isn't required either,
because $(addprefix -I, $(shell find $(LIBAWT_DIRS) -type d)) not only
creates include parameters for every sub-directory contained in
LIBAWT_DIRS, but also for the directories themselves.

make/rmic/Rmic-java.management.gmk

This change is a little bit hacky, but it's the best I could find for
the moment. The problem is that find on AIX (but also GNU find before
version 4.2) are buggy in the sense that they will report an error if
"-exec \+" is used in cases where the find command won't find any
files.

Therefore, the following make rule will fail for incremental builds if
the $(RMIC_GENSRC_DIR) directory won't contain any *.class files any
more. These class files are deleted during the first invocation of the
rule. However, the rule will be re-executed for every new build
because its target depends on the deleted files.

$(RMIC_GENSRC_DIR)/_the.classes.removed: $(RMI_IIOP) $(RMI_SRC)
       $(FIND) $(RMIC_GENSRC_DIR) -name "*.class" $(FIND_DELETE)
       $(TOUCH) $@

I've therefore added the file _the.classes.removed to the find
pattern. That way, the find command will always match at least one
file and the buggy "-exec \+" won't complain.

$(RMIC_GENSRC_DIR)/_the.classes.removed: $(RMI_IIOP) $(RMI_SRC)
       $(FIND) $(RMIC_GENSRC_DIR) \( -name "*.class" -o -name $(@F) \)
$(FIND_DELETE)
       $(TOUCH) $@

Notice, that deleting _the.classes.removed is no problem here, because
the the file will be recreated by the following touch command.

I've build and smoke tested these changes on Linux/x86_64,
Linux/ppc64, MacOS X, Solaris10/SPARC and AIX.

Thank you and best regards,
Volker

PS: I would also like to do some further cleanup in
NetworkingLibraries.gmk in a follow-up change. I think now that we
have all the corresponding directories in place we could rename
{solaris,linux,bsd}_close.c to just close.c and move them to
$(JDK_TOPDIR)/src/java.base/$(OPENJDK_TARGET_OS)/native/libnet. We
could than get rid of the platform dependent  LIBNET_EXCLUDE_FILES in
NetworkingLibraries.gmk. What's your opinion?