jdk8 extra c/cxx - flags settings

[David Holmes]

Hi Matthias,

On 22/11/2013 10:55 PM, Baesken, Matthias wrote:
>
> I had the need for setting additional C/C++ compilation flags in my OpenJDK8 build.
> It seems they are used for most jdk C/C++ compilation, but at least the generators from
>
> jdk/makefiles/gensrc/GensrcMisc.gmk
>
> seem to be an exception.

The "extra flags' variables are intended for use when compiling the 
actual JDK sources, not for compiling auxiliary tools used during the 
build process. There is currently no means, that I am aware of, to 
customize those invocations.

To expand further on this the primary role of the "extra flags" is to 
provide values needed for cross-compilation of the JDK sources. I'm sure 
you can see that it wouldn't make sense to pass cross-compiler options 
to the compilation of the build tools on the host build machine.

David
-----

> Example :
>
> configure --with-extra-cflags=-DTESTMYEXTRAFLAGC --with-extra-cxxflags=-DTESTMYEXTRAFLAGCXX
>
> does not lead to the expected flags in the build for  genSocketOptionRegistry.c  :
>
> ...
> /usr/local/bin/gcc  -DTHIS_FILE='"genSocketOptionRegistry.c"' -c -MMD -MF /mydir/open_jdk/jdk8/linuxx86_64_opt/jdk/gensrc/genSocketOptionRegistry/genSocketOptionRegistry.d
> -o /mydir/open_jdk/jdk8/linuxx86_64_opt/jdk/gensrc/genSocketOptionRegistry/genSocketOptionRegistry.o /mydir/open_jdk/jdk8/openjdk8/jdk/src/share/native/sun/nio/ch/genSocketOptionRegistry.c
> ...
>
> (while the flags show up for "normal" C/C++ files .)
>
> Is there another option (available  /   planned?) to configure the extra C/C++ compile flags for this special case ?
>
>
> Thanks,
>         Matthias
>