The linked fixes commit added an #include "dwarf-aux.h" to disasm.h
which gets picked up in a lot of places. Without
HAVE_DWARF_GETLOCATIONS_SUPPORT the stubs return an errno, so include
errno.h to fix the following build error:

  In file included from util/disasm.h:8,
                 from util/annotate.h:16,
                 from builtin-top.c:23:
  util/dwarf-aux.h: In function 'die_get_var_range':
  util/dwarf-aux.h:183:10: error: 'ENOTSUP' undeclared (first use in this function)
    183 |  return -ENOTSUP;
        |          ^~~~~~~

Fixes: 782959ac248a ("perf annotate: Add "update_insn_state" callback function to handle arch specific instruction tracking")
Signed-off-by: James Clark <james.clark@linaro.org>
---
 tools/perf/util/dwarf-aux.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
index 336a3a183a78..bd7505812569 100644
--- a/tools/perf/util/dwarf-aux.h
+++ b/tools/perf/util/dwarf-aux.h
@@ -9,6 +9,7 @@
 #include <elfutils/libdw.h>
 #include <elfutils/libdwfl.h>
 #include <elfutils/version.h>
+#include <errno.h>
 
 struct strbuf;
 
-- 
2.34.1

On Tue, Oct 01, 2024 at 01:36:25PM +0100, James Clark wrote:
> The linked fixes commit added an #include "dwarf-aux.h" to disasm.h
> which gets picked up in a lot of places. Without
> HAVE_DWARF_GETLOCATIONS_SUPPORT the stubs return an errno, so include
> errno.h to fix the following build error:
> 
>   In file included from util/disasm.h:8,
>                  from util/annotate.h:16,
>                  from builtin-top.c:23:
>   util/dwarf-aux.h: In function 'die_get_var_range':
>   util/dwarf-aux.h:183:10: error: 'ENOTSUP' undeclared (first use in this function)
>     183 |  return -ENOTSUP;
>         |          ^~~~~~~
> 
> Fixes: 782959ac248a ("perf annotate: Add "update_insn_state" callback function to handle arch specific instruction tracking")
> Signed-off-by: James Clark <james.clark@linaro.org>
> ---
>  tools/perf/util/dwarf-aux.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
> index 336a3a183a78..bd7505812569 100644
> --- a/tools/perf/util/dwarf-aux.h
> +++ b/tools/perf/util/dwarf-aux.h
> @@ -9,6 +9,7 @@
>  #include <elfutils/libdw.h>
>  #include <elfutils/libdwfl.h>
>  #include <elfutils/version.h>
> +#include <errno.h>

Simple enough, thanks, applied to perf-tools/perf-tools.

- Arnaldo
  
>  struct strbuf;
>  
> -- 
> 2.34.1
>

On Tue, Oct 1, 2024 at 6:47 AM Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
>
> On Tue, Oct 01, 2024 at 01:36:25PM +0100, James Clark wrote:
> > The linked fixes commit added an #include "dwarf-aux.h" to disasm.h
> > which gets picked up in a lot of places. Without
> > HAVE_DWARF_GETLOCATIONS_SUPPORT the stubs return an errno, so include
> > errno.h to fix the following build error:
> >
> >   In file included from util/disasm.h:8,
> >                  from util/annotate.h:16,
> >                  from builtin-top.c:23:
> >   util/dwarf-aux.h: In function 'die_get_var_range':
> >   util/dwarf-aux.h:183:10: error: 'ENOTSUP' undeclared (first use in this function)
> >     183 |  return -ENOTSUP;
> >         |          ^~~~~~~
> >
> > Fixes: 782959ac248a ("perf annotate: Add "update_insn_state" callback function to handle arch specific instruction tracking")
> > Signed-off-by: James Clark <james.clark@linaro.org>

There are a few variants of this same patch flying around:
https://lore.kernel.org/lkml/20240919013513.118527-4-yangjihong@bytedance.com/
https://lore.kernel.org/lkml/20240924003720.617258-4-irogers@google.com/
Just a heads up that we only need to apply 1.

Thanks,
Ian

> > ---
> >  tools/perf/util/dwarf-aux.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
> > index 336a3a183a78..bd7505812569 100644
> > --- a/tools/perf/util/dwarf-aux.h
> > +++ b/tools/perf/util/dwarf-aux.h
> > @@ -9,6 +9,7 @@
> >  #include <elfutils/libdw.h>
> >  #include <elfutils/libdwfl.h>
> >  #include <elfutils/version.h>
> > +#include <errno.h>
>
> Simple enough, thanks, applied to perf-tools/perf-tools.
>
> - Arnaldo
>
> >  struct strbuf;
> >
> > --
> > 2.34.1
> >

On 01/10/2024 2:51 pm, Ian Rogers wrote:
> On Tue, Oct 1, 2024 at 6:47 AM Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
>>
>> On Tue, Oct 01, 2024 at 01:36:25PM +0100, James Clark wrote:
>>> The linked fixes commit added an #include "dwarf-aux.h" to disasm.h
>>> which gets picked up in a lot of places. Without
>>> HAVE_DWARF_GETLOCATIONS_SUPPORT the stubs return an errno, so include
>>> errno.h to fix the following build error:
>>>
>>>    In file included from util/disasm.h:8,
>>>                   from util/annotate.h:16,
>>>                   from builtin-top.c:23:
>>>    util/dwarf-aux.h: In function 'die_get_var_range':
>>>    util/dwarf-aux.h:183:10: error: 'ENOTSUP' undeclared (first use in this function)
>>>      183 |  return -ENOTSUP;
>>>          |          ^~~~~~~
>>>
>>> Fixes: 782959ac248a ("perf annotate: Add "update_insn_state" callback function to handle arch specific instruction tracking")
>>> Signed-off-by: James Clark <james.clark@linaro.org>
> 
> There are a few variants of this same patch flying around:
> https://lore.kernel.org/lkml/20240919013513.118527-4-yangjihong@bytedance.com/
> https://lore.kernel.org/lkml/20240924003720.617258-4-irogers@google.com/
> Just a heads up that we only need to apply 1.
> 
> Thanks,
> Ian
> 

Oops thanks for the heads up. Usually I check if it was already posted 
but this time it was so small I didn't do it. I'll check next time...

I don't think the fixes commit on 
https://lore.kernel.org/lkml/20240919013513.118527-4-yangjihong@bytedance.com/ 
is quite right though, so maybe this one is slightly better.