((warn_unused_result))
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[PR25509] can't disable __attribute__((warn_unused_result))
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] can't disable __attribute__((warn_unused_result))
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Title:
[PR25509] can't disable __attribute__((warn_unused_result))
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nused_result))
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sable __attribute__((warn_unused_result))
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Title:
[PR25509] can't disable __attribute__((warn_unused_result))
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https://bugs.launchpad.net/bugs/305176
Title:
[PR25509] can't disable __attribute__((warn_unused_result))
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://bugs.launchpad.net/bugs/305176
Title:
[PR25509] can't disable __attribute__((warn_unused_result))
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Title:
[PR25509] can't disable __attribute__((warn_unused_result))
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main()
{
(void) foo();
return 0;
}
=== Cut ===
g++ -Wall -W -O2 -c unused.cc
unused.cc: In function 'int main()':
unused.cc:4: warning: ignoring return value of 'int foo()', declared with
attribute warn_unused_result
Reply at: https://bugs.launchpad.net/glibc/+bug/305176/comments/0
** Branch linked: lp:debian/sid/gnat-4.4
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[PR25509] can't disable __attribute__((warn_unused_result))
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** Changed in: glibc
Status: Confirmed = Fix Released
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[PR25509] can't disable __attribute__((warn_unused_result))
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It is possible to turn off this warning! Just turn off all
optimizations :(
If you pass -O0, this program doesn't warn. If you pass -O1 or -O2, ...
the program warns.
This is especially bad for things that used to build with -Wall.
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[PR25509] can't disable
As I said in the edited bug description, -U_FORTIFY_SOURCE works too.
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I agree that this warning is sometimes excessive and inconvenient,
particularly for logging writes which are, as you put it, fire and
forget.
Notwithstanding that, though, I would note that it *is* good practice to
check non-logging writes. Contrary to popular belief, write() is not
guaranteed to
On Wed, Jan 21, 2009 at 8:11 AM, Colin Watson cjwat...@canonical.com wrote:
I agree that this warning is sometimes excessive and inconvenient,
particularly for logging writes which are, as you put it, fire and
forget.
Notwithstanding that, though, I would note that it *is* good practice to
Public bug reported:
Binary package hint: gcc
This might be in one of the libs, but the problem is fundamentally in
gcc.
There is a recent attribute (warn_unused_result) that has been applied
to nearly every function that isn't declared a void. This includes
things like write and fwrite (and
** Also affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: GCC Bugzilla #25509
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509
** Also affects: glibc via
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509
Importance: Unknown
Status: Unknown
** Changed in: glibc
Status: Unknown = Confirmed
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[PR25509] can't disable __attribute__((warn_unused_result))
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While this doesn't solve the issue of needing a -Wno-warn-unused-
result, or the lack of warnings on fprintf, it may help to disable the
pre-processor option causing the warnings to be used
(-D_FORTIFY_SOURCE=2). If you want to risk losing the other compile-
time and run-time protections, you can
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