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From: "dev-zero at gentoo dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/95889] corrupt size vs. prev_size and hang when
 using __has_include with -traditional-cpp
Date: Thu, 25 Jun 2020 07:22:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95889

--- Comment #1 from Tiziano M=C3=BCller <dev-zero at gentoo dot org> ---
Unfortunately `__has_include` is even being parsed (in traditional-cpp mode=
) if
enclosed in a `if 0 ... endif`:

****snip****
#if 0
#if __has_include(<foo.h>)
#endif
#endif
****snip****

which gives:

****snip****
# 32 "<command-line>" 2
# 1 "test2.h"
test2.h:3: error: missing '(' before "__has_include" operand
    3 | #if __has_include(<foo.h>)
      |=20
test2.h:3: error: operator "__has_include" requires a header-name
*** Error in
`/data/tiziano/cp2k/tools/toolchain/install/gcc-10.1.0/lib/gcc/x86_64-pc-li=
nux-gnu/10.1.0/cc1':
corrupted size vs. prev_size: 0x000000000249a7e0 ***
test2.h:1: confused by earlier errors, bailing out
****snip****

while enclosing it in parenthesis at least fixes that, such that the follow=
ing
parses fine:

****snip****
#if 0
#if (__has_include(<foo.h>))
#endif
#endif
****snip****=