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List:       gcc-bugs
Subject:    [Bug c/93108] New: mmix generates invalid assembly on newlib (-fstack-protector-strong -ffunction-se
From:       "slyfox at inbox dot ru" <gcc-bugzilla () gcc ! gnu ! org>
Date:       2019-12-30 21:43:59
Message-ID: bug-93108-4 () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93108

            Bug ID: 93108
           Summary: mmix generates invalid assembly on newlib
                    (-fstack-protector-strong -ffunction-sections):
                    internal error: fixup not contained within frag
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at inbox dot ru
  Target Milestone: ---

Created attachment 47572
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47572&action=edit
bug.c

Attached example is a self-contained preprocessed version of
newlib-3.1.0/newlib/libc/stdio/vfprintf.c

The crash looks like that:

  $ ./xgcc -B. -fstack-protector-strong -ffunction-sections -c bug.c -o bug.o
  bug.c: Assembler messages:
  bug.c:3419: Error: internal error: fixup not contained within frag

  $ ./xgcc -B. -v
  Reading specs from ./specs
  COLLECT_GCC=./xgcc
  COLLECT_LTO_WRAPPER=./lto-wrapper
  Target: mmix
  Configured with: ../gcc/configure --target=mmix
--prefix=/home/slyfox/dev/git/gcc-mmix/../gcc-mmix-installed
--with-sysroot=/usr/mmix --disable-bootstrap --enable-languages=c --disable-nls
--with-native-system-header-dir=/include CFLAGS=-O0 CXXFLAGS=-O0
  Thread model: single
  Supported LTO compression algorithms: zlib zstd
  gcc version 10.0.0 20191230 (experimental) (GCC)=
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