[Bug fortran/110996] New: RISC-V vector Fortran: SEGV ICE during parsing

["jeremy.bennett at embecosm dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110996

            Bug ID: 110996
           Summary: RISC-V vector Fortran: SEGV ICE during parsing
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jeremy.bennett at embecosm dot com
  Target Milestone: ---

Created attachment 55726
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55726&action=edit
Fortran 90 source code for the test case

This appears to be a failure in the Fortran parser, which only occurs if the
RISC-V vector ISA extension is specified.

This is the reproducer (testcase.f90):

  CONTAINS
   SUBROUTINE a
   END
   SUBROUTINE b
   END
   SUBROUTINE c(d) e
SUBROUTINE f
      END
END

(which has a syntax error with the stray "e" at the end of the declaration of
"SUBROUTINE c").

This is compiled with:

riscv64-unknown-linux-gnu-gfortran -march=rv64gcv -mabi=lp64d -c \
    -Ofast testcase.f90

NOTE. The error only occurs if the "v" extensions is specified in the "-march"
string.

The output is:

testcase.f90:6:20:

    6 |    SUBROUTINE c(d) e
      |                    1
Error: Syntax error in SUBROUTINE statement at (1)
f951: internal compiler error: Segmentation fault
0x112a263 crash_signal
        /home/jeremy/gittrees/mustang/gcc/gcc/toplev.cc:314
0x7fdd1203c4af ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0xaaea0a resolve_symbol
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/resolve.cc:16643
0xadadc2 do_traverse_symtree
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/symbol.cc:4190
0xab95ed resolve_types
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/resolve.cc:17963
0xab9697 resolve_types
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/resolve.cc:17977
0xac08ec gfc_resolve(gfc_namespace*)
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/resolve.cc:18083
0xa9f250 resolve_all_program_units
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/parse.cc:6909
0xa9f250 gfc_parse_file()
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/parse.cc:7165
0xaf3533 gfc_be_parse_file
        /home/jeremy/gittrees/mustang/gcc/gcc/fortran/f95-lang.cc:229
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

System information
------------------

Using built-in specs.
COLLECT_GCC=riscv64-unknown-linux-gnu-gfortran
COLLECT_LTO_WRAPPER=/home/jeremy/gittrees/mustang/install/libexec/gcc/riscv64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /home/jeremy/gittrees/mustang/gcc/configure
--target=riscv64-unknown-linux-gnu
--prefix=/home/jeremy/gittrees/mustang/install
--with-sysroot=/home/jeremy/gittrees/mustang/install/sysroot
--with-pkgversion=g68783211f66 --with-system-zlib --enable-shared --enable-tls
--enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
--disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap
--src=/home/jeremy/gittrees/mustang/gcc --enable-multilib --with-abi=lp64d
--with-arch=rv64gc --with-tune= --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2
   -mcmodel=medany' 'CXXFLAGS_FOR_TARGET=-O2    -mcmodel=medany'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230811 (experimental) (g68783211f66)