Re: [PUSHED] amdgcn: Provide stub 'gettimeofday'

I notice that model arches seem to support both GPU component clock cycle counts 
(TIME) and RTC constant frequency counts (REALTIME) instructions 
S_MEM_REALTIME/TIME or registers (RDNA3+) that would allow implementations to 
provide useful values.

Adjustments to Unix time are left as exercises for the implementers GD&R ;^>

On 2026-04-14 00:04, Brian Inglis wrote:
 > On 2026-04-13 15:40, Thomas Schwinge wrote:
>> Similar to nvptx commit 52cb9370044d11a29ae0dc1120ffdf246f5abc20
>> "nvptx: Provide stub 'gettimeofday'": instead of them FAILing due to
>> 'ld: error: undefined symbol: gettimeofday', this makes PASS a number of GCC
>> 'gfortran.dg' test cases, for example.
>> ---
>>   newlib/Makefile.in                    | 23 +++++++++++++++++++++--
>>   newlib/libc/sys/amdgcn/Makefile.inc   |  2 +-
>>   newlib/libc/sys/amdgcn/gettimeofday.c |  9 +++++++++
>>   3 files changed, 31 insertions(+), 3 deletions(-)
>>   create mode 100644 newlib/libc/sys/amdgcn/gettimeofday.c
> 
>> diff --git a/newlib/libc/sys/amdgcn/gettimeofday.c b/newlib/libc/sys/amdgcn/ 
>> gettimeofday.c
>> new file mode 100644
>> index 0000000000..8ce09a210c
>> --- /dev/null
>> +++ b/newlib/libc/sys/amdgcn/gettimeofday.c
>> @@ -0,0 +1,9 @@
>> +#include <sys/time.h>
>> +#include <errno.h>
>> +
>> +int
>> +gettimeofday (struct timeval *tv, void *tz)
>> +{
>> +  errno = ENOSYS;
>> +  return -1;
>> +}
> 
> Would be nice to make the declarations and definitions match POSIX (and Cygwin), 
> and add the embedded function docs like other man pages; see Timefns:
> 
> https://cygwin.com/git?p=newlib-cygwin.git;a=blob_plain;f=newlib/libc/time/time.tex
> 
> https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/time/time.c
> 
> and Posix:
> 
> https://cygwin.com/git?p=newlib-cygwin.git;a=blob_plain;f=newlib/libc/posix/ 
> posix.tex
> 
> https://cygwin.com/git?p=newlib-cygwin.git;a=blob_plain;f=newlib/libc/posix/popen.c
> 
> so they will be generated in the newlib libc info pages; see also:
> 
> https://git.kernel.org/pub/scm/docs/man-pages/man-pages-posix.git/tree/man- 
> pages-posix-2017/man3p/gettimeofday.3p
> 
> '\" et
> .TH GETTIMEOFDAY "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
> .\" modified Linux -> newlib
> .SH PROLOG
> This manual page is part of the POSIX Programmer's Manual.
> The newlib implementation of this interface may differ (consult
> the corresponding newlib manual page for details of newlib behavior),
> or the interface may not be implemented in newlib.
> .\"
> .SH NAME
> gettimeofday
> \(em get the date and time
> SH SYNOPSIS
> .LP
> .nf
> #include <sys/time.h>
> .P
> int gettimeofday(struct timeval *restrict \fItp\fP, void *restrict \fItzp\fP);
> .fi
> ...
> .SH "RETURN VALUE"
> The
> \fIgettimeofday\fR()
> function shall return 0 and no value shall be reserved to indicate
> an error.
> .SH ERRORS
> No errors are defined.
> ...
-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry