toolchain/55265: NetBSD/sh3el 9.0 gcc 7.4.0 ICE by -fdce

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         55265
>Category:       toolchain
>Synopsis:       NetBSD/sh3el 9.0 gcc 7.4.0 ICE by -fdce
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 14 22:10:00 +0000 2020
>Originator:     Izumi Tsutsui
>Release:        NetBSD 9.0
>Organization:
>Environment:
System: NetBSD lantank 9.0 NetBSD 9.0 (LANTANK) #1: Sun May  3 17:58:04 JST 2020  tsutsui@mirage:/s/netbsd-9/src/sys/arch/landisk/compile/LANTANK landisk
Architecture: sh3el
Machine: landisk
>Description:
During pkgsrc/x11/mlterm build on NetBSD/landisk 9.0, gcc 7.4.0 gets ICE:

---
../../libtool --mode=compile gcc   -I../../baselib/include -I../../encodefilter/include  -I/usr/pkg/include/fribidi    -Os -freorder-blocks -D_FORTIFY_SOURCE=2 -I/usr/pkg/include -I/usr/X11R7/include -I/usr/include -I/usr/X11R7/include/freetype2 -I/usr/pkg/include/glib-2.0 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include -DPNG_NO_ASSEMBLER_CODE -I/usr/pkg/include -I/usr/X11R7/include -I/usr/include -I/usr/X11R7/include/freetype2 -I/usr/pkg/include/glib-2.0 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include  -I/usr/pkg/include -DLIBDIR=\"/usr/pkg/lib\" -c   -I../../baselib/include -I../../encodefilter/include  -I/usr/pkg/include/fribidi    -Os -freorder-blocks -D_FORTIFY_SOURCE=2 -I/usr/pkg/include -I/usr/X11R7/include -I/usr/include -I/usr/X11R7/include/freetype2 -I/usr/pkg/include/glib-2.0 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include -DPNG_NO_ASSEMBLER_CODE -I/usr/pkg/include -I/usr/X11R7/include -I/usr/include -I/usr/X11R7/inc!
 lude/freetype2 -I/usr/pkg/include/glib-2.0 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include  -I/usr/pkg/include -DLIBDIR=\"/usr/pkg/lib\" vt_line_bidi.c
libtool: compile:  gcc -I../../baselib/include -I../../encodefilter/include -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.buildlink/include/fribidi -Os -freorder-blocks -D_FORTIFY_SOURCE=2 -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.buildlink/include -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.x11-buildlink/include -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.x11-buildlink/include/freetype2 -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.buildlink/include/glib-2.0 -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.buildlink/include/gio-unix-2.0 -I/usr/obj.sh3el/pkgsrc/x11/mlterm/work.sh3el/.buildlink/lib/glib-2.0/include -DPNG_NO_ASSEMBLER_CODE -DLIBDIR=\"/usr/pkg/lib\" -c -Os -freorder-blocks -D_FORTIFY_SOURCE=2 -DPNG_NO_ASSEMBLER_CODE -DLIBDIR=\"/usr/pkg/lib\" vt_line_bidi.c  -fPIC -DPIC -o .libs/vt_line_bidi.o
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
vt_line_bidi.c: In function 'vt_line_bidi_render':
vt_line_bidi.c:144:1: internal compiler error: Abort trap
 }
 ^
no stack trace because unwind library not available
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/support/send-pr.html> for instructions.
*** Error code 1

Stop.
---

>How-To-Repeat:
This ICE also happens on cross compiler on NetBSD/i386 9.0.

A sample code to reproduce is as the following:

---
struct vt_bidi_state {
  char rtl_state;
};
typedef struct vt_bidi_state *vt_bidi_state_t;

typedef struct ctl_info {
  vt_bidi_state_t bidi;
} ctl_info_t;

typedef struct vt_line {
  ctl_info_t ctl_info;
} vt_line_t;

#define BASE_IS_RTL(state) ((((state)->rtl_state) >> 1) & 0x1)

extern int f1(void), f2(void), f3(void), f4(void);

int vt_line_bidi_render(vt_line_t *line)
{
  int ret;

  if (f1()) {
    int base_was_rtl;

    base_was_rtl = BASE_IS_RTL(line->ctl_info.bidi);
    if ((ret = f2()) <= 0) {
      if (base_was_rtl) {
        f3();
      }
      return ret;
    }
    if (base_was_rtl != BASE_IS_RTL(line->ctl_info.bidi)) {
      return 1;
    }
  }
  if (ret == 2) {
    f4();
  }
  return 1;
}
---

On NetBSD/i386 9.0 with 9.0 toolchain:
---
% /s/netbsd-9/src/obj.landisk/tooldir.NetBSD-9.0-i386/bin/shle--netbsdelf-gcc -O -c ~/vt_line_bidi.c
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
/home/tsutsui/vt_line_bidi.c: In function 'vt_line_bidi_render':
/home/tsutsui/vt_line_bidi.c:40:1: internal compiler error: Abort trap
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://www.NetBSD.org/Misc/send-pr.html> for instructions.
% /s/netbsd-9/src/obj.landisk/tooldir.NetBSD-9.0-i386/bin/shle--netbsdelf-gcc -O -fno-dce -c ~/vt_line_bidi.c
% 
---

Also available on github gist:
 https://gist.github.com/tsutsui/914960ca1739f2d696445024c13c9543

>Fix:
No idea.
"-fno-dce" works around on pkgsrc mlterm build as above.

---
Izumi Tsutsui