[Bug c++/48026] New: #pragma optimize ignored for C++

[Bug c++/48026] New: #pragma optimize ignored for C++

[sam at robots dot org.uk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

           Summary: #pragma optimize ignored for C++
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sam@robots.org.uk


#pragma optimize seems to be ignored for C++.


=== Makefile ===
all: opt_c.s opt_cxx.s
.PHONY: all

opt_c.s: opt.c
    gcc -S -o $@ -O2 $<

opt_cxx.s: opt.c
    g++ -S -o $@ -O2 $<

clean:
    rm -f *.s
.PHONY: clean

=== opt.c ===
#pragma GCC optimize ("O0")

#ifdef __OPTIMIZE__
#error help!
#endif

int main () {
    int i;
    for (i = 0; i < 2000000000; ++i)
        ;
}

=== test output ===
$ make -k
gcc -S -o opt_c.s -O2 opt.c
g++ -S -o opt_cxx.s -O2 opt.c
opt.c:4:2: error: #error help!
make: *** [opt_cxx.s] Error 1
make: Target `all' not remade because of errors.

[Bug c++/48026] #pragma optimize ignored for C++

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-02-02
         Depends on|                            |41201
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-02-02 06:24:46 UTC ---
Confirmed, this is most likely the same issue as PR 41201.

[Bug c++/48026] #pragma optimize ignored for C++

[linux at carewolf dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Allan Jensen <linux at carewolf dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |linux at carewolf dot com

--- Comment #2 from Allan Jensen <linux at carewolf dot com> 2012-07-25 12:40:22 UTC ---
(In reply to comment #1)
> Confirmed, this is most likely the same issue as PR 41201.

Well, not completely the same. The original issue reported in PR 41201 is about
defining the macros, but the possible fix in
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201#c6 is about this bug.

[Bug c++/48026] #pragma optimize ignored for C++

[f.boesing at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Frank <f.boesing at gmx dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |f.boesing at gmx dot de

--- Comment #3 from Frank <f.boesing at gmx dot de> ---
Still existent in 4.8.4

[Bug c++/48026] #pragma optimize ignored for C++

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
This is probably because the preprocessor runs before the #pragmas are handled.
If so, this is the same issue as for #pragma GCC diagnostics in C++ (PR53431).
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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/64336] Template functions are not instrumented at -O0 and -Og
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd336

--- Comment #3 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Yes, this patch seems to work...

But why did this only cause problems with template expansions and nothing else
?

[Bug c++/48026] #pragma optimize ignored for C++ for preprocessor

[gb.devel at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Gwenole Beauchesne <gb.devel at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gb.devel at gmail dot com

--- Comment #5 from Gwenole Beauchesne <gb.devel at gmail dot com> ---
Created attachment 56811
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56811&action=edit
Proposed patch against trunk

Here is a proposed patch against trunk, which includes a fix for PR
preprocessor/87299 (#pragma GCC target).

[Bug c++/48026] #pragma optimize ignored for C++ for preprocessor

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026
Bug 48026 depends on bug 41201, which changed state.

Bug 41201 Summary: #pragma GCC target ("sse2") doesn't alter __SSE2__ in C++ (as it does in C)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

[Bug c++/48026] #pragma optimize ignored for C++ for preprocessor

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

--- Comment #6 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Gwenole Beauchesne from comment #5)
> Created attachment 56811 [details]
> Proposed patch against trunk
> 
> Here is a proposed patch against trunk, which includes a fix for PR
> preprocessor/87299 (#pragma GCC target).

Could you send this to the mailing list if it's still relevant? Thanks.

(https://gcc.gnu.org/contribute.html)

[Bug c++/48026] #pragma optimize ignored for C++ for preprocessor

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48026

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tellowkrinkle at gmail dot com

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 114370 has been marked as a duplicate of this bug. ***