tools lib traceevent: Robustify do_generate_dynamic_list_file

The dynamic-list-file used to export dynamic symbols introduced in

commit e3d09ec8126f ("tools lib traceevent: Export dynamic symbols
used by traceevent plugins")

is generated without any sort of error checking.

I experienced problems due to an old version of nm (v 0.158) that outputs
in a format distinct from the assumed by the script.

Robustify the built of dynamic symbol list  by enforcing that the second
column of $(NM) -u <files> is either "U" (Undefined), "W" or "w" (undefined
weak), which are the possible outputs from non-ancient $(NM) versions.
Print an error if format is unexpected.

v2: Accept "W" and "w" symbol options.

Signed-off-by: David Carrillo-Cisneros <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: He Kuang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Paul Turner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Uwe Kleine-König <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Use STRING1 = STRING1 instead of == to make this work on Ubuntu systems ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions