On Fri, 2008-08-08 at 11:14 -0500, Joel Sherrill wrote: > Samuel Tardieu wrote: > >>>>>> "Thomas" == Thomas Quinot <[EMAIL PROTECTED]> writes: > >>>>>> > > > > Thomas> As an alternative to Arno's suggestion, maybe you could use > > Thomas> the --with-sysroot configure parameter to make the required > > Thomas> headers available to the build process. I know others have > > Thomas> used this method on some cross targets. > > > > Do you mean --with-build-sysroot? > > > I tried that and got a variation on the theme to work. > I used CFLAGS_FOR_TARGETS to pass in where the > OS include files where. I posted a patch to gcc-patches > and ACATS results to gcc-testresults. > > Thanks for the hint. Hopefully the patch is OK. It isn't big. > > FWIW cd2a24e now has a gnat bug box on sparc and powerpc. > I filed it as PR 35298. > > > For those who care, --sysroot does not work RTEMS because: > > (1) Apparently the RTEMS standard binutils RPMs do > not support sysroots. Not quite. We don't use sysroot, because we don't need it.
> /home/joel/work-gnat/svn//install/powerpc-rtems4.9/bin/ld: this linker > was not configured to use sysroots > collect2: ld returned 1 exit status Correct. We don't have a sysroot, because all of our headers are inside of GCC's standard include directories. > (2) RTEMS doesn't install into a /usr/include structure. It does. What you seem to be missing is our toolchains being cross-compilers. This means our headers land in $exec_prefix/$target/include (e.g. /opt/rtems-4.9/sparc-rtems4.9/include) instead of $exec_prefix/include ... AFTER building (!) [newlib based, one-tree style building: Headers have not yet been installed while building. Building picks them up from temporary directories inside of the build tree] > According to > the gcc documentation--sysroot DIR looks in DIR/usr/[include|lib]. Not true: # touch tmp.c # /opt/rtems-4.9/bin/sparc-rtems4.9-gcc -v -c tmp.c ... ignoring nonexistent directory "/opt/rtems-4.9/lib64/gcc/sparc-rtems4.9/4.3.1/../../../../sparc-rtems4.9/sys-include" ... => /opt/rtems-4.9/sparc-rtems4.9/sys-include => the default is $exec_prefix/$target/sys-include Ralf
