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Cygwin testsuite regressions: -dirafter and system files
- To: gcc-gnats at gcc dot gnu dot org
- Subject: Cygwin testsuite regressions: -dirafter and system files
- From: David dot Billinghurst at riotinto dot com
- Date: 2 Mar 2001 03:13:39 -0000
- CC: cygwin at sources dot redhat dot com
- Reply-To: David dot Billinghurst at riotinto dot com
>Category: preprocessor
>Synopsis: Cygwin testsuite regressions: -dirafter and system files
>Confidential: no
>Severity: serious
>Priority: medium
>Class: sw-bug
>Submitter-Id: net
>Originator: David Billinghurst
>Release: gcc 3.0 prerelease
>Environment:
NT4 SP1 / cygwin
>Description:
This report summarises recent discussions on gcc-patches and gcc-bugs concerning a gcc 3.0 pre-release regression from gcc-2.95.2 on cygwin.
The following five testsuite tests pass with gcc-2.95.2 but fail with gcc 3.0.
The tests that fail are:
gcc.dg/cpp/19990407-1.c
gcc.dg/cpp/19990703-1.c
gcc.dg/cpp/20000625-2.c
gcc.dg/cpp/strp1.c
gcc.dg/cpp/strp2.c
Each test gnerates warnings of the form "/usr/include/sys/types.h:110: ISO C89 does not support `long long'"
The errors occur because /usr/include/sys/types.h is not treated as system header. To be treated as a system header /usr/include must be referenced in the specs using -isystem /usr/include, but it is referenced using -dirafter /usr/include.
>How-To-Repeat:
>Fix:
There are at least two fixes.
1. Treat paths given with -dirafter as system files, see http://gcc.gnu.org/ml/gcc-patches/2001-02/msg01742.html. I can confirm this bootstraps and fixes the regressions. This change is relatively safe, as only a couple of targets use -idirafter.
2. Change the cygwin specs to that we use -isystem rather than -dirafter. This approach could also work - see http://gcc.gnu.org/ml/gcc-bugs/2001-02/msg00678.html but see the follow-up posts as there are some issues to resolve as the use of -dirafter was deliberate.
>Unformatted:
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