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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/98943] [11 Regression] gcc driver does not fail on
 unknown files: tricks configure scripts to recognize /W4 and -diag-disable
 1,2,3,4 options
Date: Wed, 03 Feb 2021 14:11:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98943

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For -diag-disable , even gcc 10 would just warn on that rather than error:
gcc -S -diag-disable -xc /dev/null
cc1: warning: unrecognized gcc debugging option: i
cc1: warning: unrecognized gcc debugging option: g
cc1: warning: unrecognized gcc debugging option: -
cc1: warning: unrecognized gcc debugging option: d
cc1: warning: unrecognized gcc debugging option: i
cc1: warning: unrecognized gcc debugging option: s
cc1: warning: unrecognized gcc debugging option: b
cc1: warning: unrecognized gcc debugging option: l
cc1: warning: unrecognized gcc debugging option: e

It is just that one got error because 188,1684,... wasn't an existing filen=
ame.=