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Subject: Cygwin build from source is broken since binutils-2.42-1
To: cygwin AT cygwin DOT com
Message-ID: <ad23413c-3b72-884a-178f-4b1e8be3ee65@t-online.de>
Date: Mon, 12 Feb 2024 11:10:58 +0100
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From: Christian Franke via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Christian Franke <Christian DOT Franke AT t-online DOT de>
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This is not a binutils regression: A build from cygwin 3.5.0-1 src 
package or current newlib-cygwin git main (bfb68a9) with new 
binutils-2.42-1 fails with:

"
In file included from ../../../../winsup/utils/dumper.cc:23:
/usr/include/bfd.h:2748:1: error: expected initializer before 
‘ATTRIBUTE_WARN_UNUSED_RESULT’
"

Downgrading to binutils 2.41-3 fixes the problem.

A diff of /usr/include/bsd.h shows that ATTRIBUTE_WARN_UNUSED_RESULT is 
a new addition in 2.42-1. This requires /usr/include/ansidecl.h. It is 
included by /usr/include/bsd.h but this has no effect because Cygwin 
source tree provides its own ansidecl.h which lacks 
ATTRIBUTE_WARN_UNUSED_RESULT:

$ g++ ....MANY_OPTIONS... -E ../../../../winsup/utils/dumper.cc
...
# 1 "../../../../winsup/utils/dumper.cc"
...
# 1 "../../../../winsup/../include/ansidecl.h" 1  <== #define _ANSIDECL_H
...
# 1 "/usr/include/bfd.h" 1 3 4
...
# 1 "/usr/include/ansidecl.h" 1 3 4  <== #ifndef _ANSIDECL_H
...

-- 
Regards,
Christian


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