https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100067
Bug ID: 100067
Summary: Unexpected warning for -mcpu=neoverse-n1 when
configured with --with-fpu
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rearnsha at gcc dot gnu.org
Target Milestone: ---
If the compiler is configured with (for example):
--with-arch=armv7-a --with-fpu=neon --with-float=hard
then compiling with
gcc -S -mcpu=neoverse-n1 <any-c-file>
leads to an unexpected warning:
cc1: warning: switch ‘-mcpu=neoverse-n1’ conflicts with ‘-march=armv8.2-a’
switch
The same can be seen if -mfpu is passed explicitly on the command-line (which,
while it shouldn't happen, is slightly less surprising).
If -mfpu is specified to be anything other than auto (via command line or
configuration), it is expected that this will override *all* features from the
cpu/arch setting that relate to the use of the FPU.
Note, we should probably at this point progress the deprecation process for
-mfpu by deprecating the config option that allows this to be set during
configure.
