[PATCH] profile-manual: Document the PACKAGE_KEEP_SECTIONS variable.

[Mathieu Othacehe <othacehe@gnu.org>]

Document the 'PACKAGE_KEEP_SECTIONS' variable that can be used to keep some
specific ELF sections while stripping binaries and libraries.

That one can then be used to keep the .debug_frame section around for
example, this way:

PACKAGE_KEEP_SECTIONS = ".debug_frame"

By using libunwind + minidebuginfo, that provides a way for users to get
debug_frame based backtraces on target.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
---
 documentation/profile-manual/intro.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/documentation/profile-manual/intro.rst b/documentation/profile-manual/intro.rst
index 317912552..a7243c1ca 100644
--- a/documentation/profile-manual/intro.rst
+++ b/documentation/profile-manual/intro.rst
@@ -75,3 +75,9 @@ Additionally, in order to generate the right type of debug info, we also need to
 set :term:`PACKAGE_DEBUG_SPLIT_STYLE` in the ``local.conf`` file::
 
    PACKAGE_DEBUG_SPLIT_STYLE = 'debug-file-directory'
+
+When you are building a stripped image, you can also keep some specific ELF
+sections in the image by setting :term:`PACKAGE_KEEP_SECTIONS` in the
+``local.conf`` file::
+
+   PACKAGE_KEEP_SECTIONS = ".debug_frame"
-- 
2.47.1