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From: "Matt Sexton via gcc-help" <gcc-help@gcc.gnu.org>
Reply-To: Matt Sexton <matt.sexton@redlinetrading.com>
Date: Fri, 19 Jan 2018 15:54:00 -0000
Message-ID: <CAMp6Wr_9=cvY4tCVq_orUspdWQNQ57AFbkShtC3BaiPwCeYWDA@mail.gmail.com>
Subject: Re: internal compiler error
To: gcc-help <gcc-help@gcc.gnu.org>
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And here's a different piece of code that triggers a segfault:

$ cat bug.c

typedef enum { a } b;

typedef struct { b action } c;

d;

inline e(void *p1) {

  long *f = p1;

  long g = f[g] = d;

}

typedef struct { int h } i;

__thread i j;

k() {

  int *l = &j.h;

  c *entryp = l;

  int m = &entryp[m];

  for (;;) {

    e(&entryp[m]);

    entryp[m].action = a;

  }

}


$ x86_64-w64-mingw32-gcc -c -O -ftree-pre bug.c

*bug.c:2:27:* *warning: *no semicolon at end of struct or union

 typedef struct { b action *}* c;

                           *^*

*bug.c:3:1:* *warning: *data definition has no type or storage class

 *d*;

 *^*

*bug.c:3:1:* *warning: *type defaults to '*int*' in declaration of '*d*' [
*-Wimplicit-int*]

*bug.c:4:8:* *warning: *return type defaults to '*int*' [*-Wimplicit-int*]

 inline *e*(void *p1) {

        *^*

*bug.c:8:24:* *warning: *no semicolon at end of struct or union

 typedef struct { int h *}* i;

                        *^*

*bug.c:10:1:* *warning: *return type defaults to '*int*' [*-Wimplicit-int*]

 *k*() {

 *^*

*bug.c:* In function '*k*':

*bug.c:12:15:* *warning: *initialization from incompatible pointer type [
*-Wincompatible-pointer-types*]

   c *entryp = *l*;

               *^*

*bug.c:13:11:* *warning: *initialization makes integer from pointer without
a cast [*-Wint-conversion*]

   int m = *&*entryp[m];

           *^*

*bug.c:10:1:* *internal compiler error: *Segmentation fault

 *k*() {

 *^*

Please submit a full bug report,

with preprocessed source if appropriate.

See <http://bugzilla.redhat.com/bugzilla> for instructions.