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* [Bug target/17989] New: Add a warning for more than one -march option on command line
@ 2004-10-14 3:25 giovannibajo at libero dot it
2004-10-14 13:29 ` [Bug target/17989] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: giovannibajo at libero dot it @ 2004-10-14 3:25 UTC (permalink / raw)
To: gcc-bugs
It looks like conflicting -march options are not handled correctly.
Specifically, if you specify both "-march=athlon-xp -march=pentium" on the
command line, GCC still emits MMX instructions.
I think that the code parsing the -march option in the backend assumes that
only one option is specified at a time. My suggestion is to emit a warning() if
more than one option is found on the command line, which is easier to code and
does not need to be maintained in future.
--
Summary: Add a warning for more than one -march option on command
line
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: giovannibajo at libero dot it
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: x86-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17989
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/17989] Add a warning for more than one -march option on command line
2004-10-14 3:25 [Bug target/17989] New: Add a warning for more than one -march option on command line giovannibajo at libero dot it
@ 2004-10-14 13:29 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-10-14 13:29 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-10-14 13:29 -------
This bug report was a response to PR 17990 where we thought that -march=pentium was coming after
the other march but I just tested that and it works. With -march=pentium we don't output mmx/sse
instructions at all.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17989
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2004-10-14 3:25 [Bug target/17989] New: Add a warning for more than one -march option on command line giovannibajo at libero dot it
2004-10-14 13:29 ` [Bug target/17989] " pinskia at gcc dot gnu dot org
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