[PATCH V4] tracing: install trace events file only if necessary

[PATCH V4] tracing: install trace events file only if necessary

[casantos]

From: Carlos Santos <casantos@redhat.com>

It is not useful when configuring with --enable-trace-backends=nop.

Signed-off-by: Carlos Santos <casantos@redhat.com>
---
Changes v1->v2:
  Install based on chosen trace backend, not on chosen emulators.
Changes v2->v3:
  Add missing comma
Changes v3->v4:
  Fix array comparison:
    get_option('trace_backends') != [ 'nop' ]
  not
    get_option('trace_backends') != 'nop'
---
 trace/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/trace/meson.build b/trace/meson.build
index 8e80be895c..30b1d942eb 100644
--- a/trace/meson.build
+++ b/trace/meson.build
@@ -64,7 +64,7 @@ trace_events_all = custom_target('trace-events-all',
                                  input: trace_events_files,
                                  command: [ 'cat', '@INPUT@' ],
                                  capture: true,
-                                 install: true,
+                                 install: get_option('trace_backends') != [ 'nop' ],
                                  install_dir: qemu_datadir)
 
 if 'ust' in get_option('trace_backends')
-- 
2.31.1

Re: [PATCH V4] tracing: install trace events file only if necessary

[Daniel P. Berrangé]

Copying Stefan as the trace subsystem maintainer

On Fri, Apr 07, 2023 at 10:04:10PM -0300, casantos@redhat.com wrote:
> From: Carlos Santos <casantos@redhat.com>
> 
> It is not useful when configuring with --enable-trace-backends=nop.
> 
> Signed-off-by: Carlos Santos <casantos@redhat.com>
> ---
> Changes v1->v2:
>   Install based on chosen trace backend, not on chosen emulators.
> Changes v2->v3:
>   Add missing comma
> Changes v3->v4:
>   Fix array comparison:
>     get_option('trace_backends') != [ 'nop' ]
>   not
>     get_option('trace_backends') != 'nop'
> ---
>  trace/meson.build | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/trace/meson.build b/trace/meson.build
> index 8e80be895c..30b1d942eb 100644
> --- a/trace/meson.build
> +++ b/trace/meson.build
> @@ -64,7 +64,7 @@ trace_events_all = custom_target('trace-events-all',
>                                   input: trace_events_files,
>                                   command: [ 'cat', '@INPUT@' ],
>                                   capture: true,
> -                                 install: true,
> +                                 install: get_option('trace_backends') != [ 'nop' ],
>                                   install_dir: qemu_datadir)
>  
>  if 'ust' in get_option('trace_backends')
> -- 
> 2.31.1
> 
> 

With regards,
Daniel
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Re: [PATCH V4] tracing: install trace events file only if necessary

[Stefan Hajnoczi]

On Fri, 7 Apr 2023 at 21:05, <casantos@redhat.com> wrote:
>
> From: Carlos Santos <casantos@redhat.com>
>
> It is not useful when configuring with --enable-trace-backends=nop.
>
> Signed-off-by: Carlos Santos <casantos@redhat.com>
> ---
> Changes v1->v2:
>   Install based on chosen trace backend, not on chosen emulators.
> Changes v2->v3:
>   Add missing comma
> Changes v3->v4:
>   Fix array comparison:
>     get_option('trace_backends') != [ 'nop' ]
>   not
>     get_option('trace_backends') != 'nop'
> ---
>  trace/meson.build | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks, applied to my block-next tree:
https://gitlab.com/stefanha/qemu/-/commit/d0380c64b4002e6da3b6e205468030d9e76dcc4a

Stefan