Re: PL/1 frontend

[Richard Guenther <richard dot guenther at gmail dot com>]

On Thu, Nov 11, 2010 at 3:47 PM, Merrick, Thomas
<Thomas.Merrick@tamucc.edu> wrote:
> I would like to resurrect the PL/1 frontend which appears to have stopped development about 3 years ago. ?I plan to start with the preprocessor, which is a PL/1 subset interpreter.
>
> First of all, is this the correct list to ask questions about writing a frontend? ?I plan on using GCC 4.5.1 and most of the example frontends seem to be made for 4.4.3 or earlier and do not work against 4.5.1. ?Is there a good example that works on 4.5.1? ?I just need the minimal subset right now as the preprocessor does not output, except for debugging and the input stream for the main PL/1 processor.
>
> When I wrote a minimal frontend program, I get the following during linking:
>
> /a0/staff/tmerrick/gcc-4.5.1/host-i686-pc-linux-gnu/prev-gcc/xgcc -B/a0/staff/tmerrick/gcc-4.5.1/host-i686-pc-linux-gnu/prev-gcc/ -B/usr/local/i686-pc-linux-gnu/bin/ -B/usr/local/i686-pc-linux-gnu/bin/ -B/usr/local/i686-pc-linux-gnu/lib/ -isystem /usr/local/i686-pc-linux-gnu/include -isystem /usr/local/i686-pc-linux-gnu/sys-include ? ? -g -O2 -fomit-frame-pointer -gtoggle -DIN_GCC ? -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wc++-compat ? -DHAVE_CONFIG_H ?-o pl11 \
> ? ? ? ?pl1/pl11.o main.o ?libbackend.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a ../libcpp/libcpp.a ? ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a ?attribs.o ? -L/a0/staff/tmerrick/gcc-4.5.1/host-i686-pc-linux-gnu/gmp/.libs -L/a0/staff/tmerrick/gcc-4.5.1/host-i686-pc-linux-gnu/mpfr/.libs -L/a0/staff/tmerrick/gcc-4.5.1/host-i686-pc-linux-gnu/mpc/src/.libs -lmpc -lmpfr -lgmp -rdynamic -ldl ?-L../zlib -lz -lelf
> libbackend.a(coverage.o):(.rodata+0x20): undefined reference to `gt_ggc_mx_lang_tree_node'
> libbackend.a(coverage.o):(.rodata+0x24): undefined reference to `gt_pch_nx_lang_tree_node'
> libbackend.a(dbxout.o):(.rodata+0x180): undefined reference to `gt_ggc_mx_lang_tree_node'
> libbackend.a(dbxout.o):(.rodata+0x184): undefined reference to `gt_pch_nx_lang_tree_node'
>
> With the last 4 lines repeated about 100 times for various parts of the backend. ?I am not sure if this is for debugging or inline code, but there is obviously something that I am missing. ?Any ideas?

You need to define a lang_tree_node type, even if its empty.  See
the lto frontend example.

>
> Tom Merrick
> IT Manager
> College of Science & Technology
> Texas A&M University
> CI 352
> 6300 Ocean Drive
> Corpus Christi, TX 78412-5806
> Phone: 361-825-2435
> Fax: 361-825-5789
>
>