[Bug 1810606] Re: gcc compile fail with internal error while compiling structs

[Matthias Klose]

GCC 8 and newer have the correct error message:

struct.cc:29:1: error: initialization of flexible array member in a nested context
   29 | };
      | ^
struct.cc:29:1: error: initialization of flexible array member in a nested context


** Changed in: gcc-defaults (Ubuntu)
       Status: New => Fix Released

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Title:
  gcc compile fail with internal error while compiling structs

Status in gcc-defaults package in Ubuntu:
  Fix Released

Bug description:
  Having the below struct-structure, the compiler fails with internal
  error:

  struct xxxx_option
  {
      const char *option;
      const char *description;
  };

  struct xxxx_menu_sub
  {
      const char *category;
      struct xxxx_option option [];
  };

  struct xxxx_menu_sub menu [] =
  {
      {
          "MENU1",
          {
              { "a", "AAA" },
              { "b", "BBB" }
          }
      },
      {
          "MENU2",
          {
              { "c", "CCC" },
              { "d", "DDD" }
          }
      }
  };

  # cc src/structerror.cpp -o build/structerror
  src/structerror.cpp:45:1: internal compiler error: in output_constructor_regular_field, at varasm.c:5030
   }
   ^
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.

  Removing "MENU2", "c" and "d": The compilation works.

  # gcc -v
  Using built-in specs.
  COLLECT_GCC=gcc
  COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
  OFFLOAD_TARGET_NAMES=nvptx-none
  OFFLOAD_TARGET_DEFAULT=1
  Target: x86_64-linux-gnu
  Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-27ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
  Thread model: posix
  gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04)

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