Building JDK8 b106 with sysroot and isystem

[David Holmes]

On 17/09/2013 4:14 AM, Jungwoo Ha wrote:
> Hi,
>
> I am trying to build jdk8 b106 with customized compiler and libc.
> I'm trying to add sysroot and isystem wherever necessary.
> The new configure seems to have --with-extra-*flags and --with-sys-root,
> but here are problems I found so far.
>
> 1) It doesn't seem that --with-sys-root/--with-extra-*flags parameter is
> actually used during the compilation

--with-extra-* flags are used as follows:

CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"

# Hotspot needs these set in their legacy form
LEGACY_EXTRA_CFLAGS=$with_extra_cflags
LEGACY_EXTRA_CXXFLAGS=$with_extra_cxxflags
LEGACY_EXTRA_LDFLAGS=$with_extra_ldflags


> 2) When specifying --with-tool-dir, configure script doesn't use
> --with-sys-root to check if the compilation and linking is done correctly.
> 3) LDFLAGS doesn't work all the time. Many makefile still contains old
> LFLAGS.

In the new build system? The old makefiles are under the jdk/make 
directory. The new build system is under the jdk/makefiles directory - 
no use of LFLAGS in there.

> 4) I can add these flags on CFLAGS and CXXFLAGS, but jdk/ doesn't propagate
> these properly.
> 5) For example,  BUILD_GENSRC_SOR_EXE in jdk, when calling
> SetupNativeCompilation, it doesn't pass CXXFLAGS.

The flags are intended for building JDK components, not compiling helper 
utilities. But I can understand you would want the helper compiled using 
your compiler and libc etc.

> So are these new configure & make still work-in-progress, or
> are these supposed to work?

For my mind there are too many similar but different aspects here ie 
tool-kits and sysroots that complicate things - there seem to be 
multiple possible ways to use them. For true cross-compilation things 
work fine and very simply.

David

> Thanks,
> Jungwoo
>