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From: =?UTF-8?B?SmnFmcOtIEVuZ2VsdGhhbGVy?= <engycz AT gmail DOT com>
Date: Tue, 27 Nov 2018 11:32:54 +0100
Message-ID: <CAHODtZSGx4ix7baJwYDyieJ_p0QGBHRK4cPgt0Fo7yFa+QRL5w@mail.gmail.com>
Subject: GCC: Precompiled headers - Segmentation fault
To: cygwin AT cygwin DOT com
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Hi,
  I have a problem with GCC 7.3.0 (problem is in all versions) and
precompiled headers.
I have the sample file http://ge.tt/7fRLk1t2 which causes Segmentation
fault in cc1.
The test passes normally on Linux. I searched why and found that the result
here
https://github.com/gcc-mirror/gcc/blob/gcc-7_3_0-release/gcc/ggc-common.c#L626
is 1 in Linux and -1 in CygWin.

In Linux the method called is
https://github.com/gcc-mirror/gcc/blob/gcc-7_3_0-release/gcc/config/host-linux.c#L182

In Cygwin the method called is
https://github.com/gcc-mirror/gcc/blob/gcc-7_3_0-release/gcc/ggc-common.c#L708
- mmap return address is not equal to base address.

There are also some reports in gcc bugzilla.

Regards
  Jiří Engelthaler

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