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[PATCH] doc: hint about GIT_DEBUGGER

We check for a handy environment variable GIT_DEBUGGER when running via
bin-wrappers/, but this feature is undocumented. Add a hint to how to
use it into the CodingGuidelines (which is where other useful
environment settings like DEVELOPER are documented).

It looks like you can use GIT_DEBUGGER to pick gdb by default, or you
can hand it your own debugger if you like to use something else (or if
you want custom flags for gdb). Hopefully document that intent within

Signed-off-by: Emily Shaffer <emilyshaffer@xxxxxxxxxx>
Maybe this isn't the right place for this patch. But right now git grep
reveals that GIT_DEBUGGER is completely undocumented.

Alternatively, it might make sense to only add a short blurb about using
GIT_DEBUGGER flag to CodingGuidelines and then documenting how to use it
inside of wrap-for-bin.sh.

 Documentation/CodingGuidelines | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 32210a4386..e17cd75b50 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -412,6 +412,11 @@ For C programs:
    must be declared with "extern" in header files. However, function
    declarations should not use "extern", as that is already the default.
+ - You can launch gdb around your program using the shorthand GIT_DEBUGGER.
+   Run `GIT_DEBUGGER=1 ./bin-wrappers/git foo` to simply use gdb as is, or
+   run `GIT_DEBUGGER=debugger-binary some-args ./bin-wrappers/git foo` to
+   use your own debugger and arguments. (See `wrap-for-bin.sh`.)
 For Perl programs:
  - Most of the C guidelines above apply.