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sr #110265: document a problem with AC_EGREP_CPP and AC_EGREP_HEADER

Submitter:  Bruno Haible <haible>
Submitted:  Tue 14 Jul 2020 07:35:10 PM UTC
   
 
Priority:  * 5 - Unprioritized Severity:  3 - Normal
Status:  Done Privacy:  Public
Assigned to:  None Open/Closed:  Closed
Operating System:  None
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Wed 15 Jul 2020 11:29:18 PM UTC, comment #1: 

Thanks, I installed the attached patch.

(file #49490)

Paul Eggert <eggert>
Group administrator
Tue 14 Jul 2020 07:35:10 PM UTC, original submission:  

Add documentation to AC_EGREP_CPP and AC_EGREP_HEADER, warning about the problem described in
https://lists.gnu.org/archive/html/bug-autoconf/2017-02/msg00001.html
Namely:

Some uses of AC_EGREP_CPP and AC_EGREP_HEADER probably assume that when no continuation lines (backslash-newline) and no multiline macro invocations are involved, each source line produces at most one output line.

This is no longer the case with GCC >= 5.

Bruno Haible <haible>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2020-07-15 eggert Attached File- Added 0001-Document-AC_EGREP-better.patch, #49490
        StatusNone Done
        Open/ClosedOpen Closed

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