https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107201
Bug ID: 107201
Summary: [avr] -nodevicelib not working for devices
-mmcu=avr...
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
The -nodevicelib option can be used so that the executable is not linked
against -l<device> when a device is specified as -mmcu=<device>. This is
useful if such a library is not avilable.
This is achieved by the following spec in the device-specs file specs-<device>:
*avrlibc_devicelib:
%{!nodevicelib:-lavr64dd64}
However, in a spec function, the driver in
./gcc/config/avr/driver-avr.c[c]::avr_devicespecs_file() removes that option
because it thinks that -mmcu=avr* is a device *family* like avr25 or avrxmega2
etc.:
#if defined (WITH_AVRLIBC)
" %{mmcu=avr*:" X_NODEVLIB "} %{!mmcu=*:" X_NODEVLIB "}",
#else
where X_NODEVLIB resolves to "%<nodevicelib %<nodevicespecs"
This means that -nodevicelib is removed also for -mmcu=avr* devices, not only
for -mmcu=avr* cores.
All this worked because up to now, no AVR devices where named "avr*", so that
"avr*" worked to identify cores.
