I agree that it's not clear how this should be done. We have support for compiling with a custom compiler and sysroot, though it's not yet the official way of building the OracleJDK. The following configure options are used for this:

--with-tools-dir, use as a path variable to point to directories containing executables, like compilers. --with-sys-root, point to a directory root for headers and libs to compile and link against. --with-devkit, a shortcut for setting both of the above if the layout of the devkit follows a certain standard.

When inspecting how this is treated by configure, I notice that we don't actually add the --sysroot option to the compile and link lines when setting --with-sys-root, we just use that path for looking for X11 and other libs we depend on. Our internal devkit was constructed to be a self contained toolchain, so the --sysroot parameter is already compiled into gcc and isn't needed, which is why it works for us.

So basically, this could use some fixing.

/Erik

On 2013-09-16 20:14, 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
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.
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.

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

Thanks,
Jungwoo

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