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?
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
