commit 2337a3b8864bdf4e700a9af020f665e9f4bec56d
author Gilles Peskine <Gilles.Peskine@arm.com> Fri Dec 22 13:25:18 2023 +0100
committer Gilles Peskine <Gilles.Peskine@arm.com> Fri Dec 22 14:16:21 2023 +0100
tree 688d82844e9972d4d0d0c8a82680b601d5f4aab7
parent 259df9897267d95e97d6c2a813b4112f11c39637

Explain the use of control

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

scripts/common.make

diff --git a/scripts/common.make b/scripts/common.make
index a2d1449..6d2fbc3 100644
--- a/scripts/common.make
+++ b/scripts/common.make
@@ -66,6 +66,10 @@
   SHARED_SUFFIX=
   ifndef THREADING
     # Auto-detect configurations with pthread.
+    # If the call to remove_unset_options returns "control", the symbols
+    # are confirmed set and we link with pthread.
+    # If the auto-detection fails, the result of the call is empty and
+    # we keep THREADING undefined.
     ifeq (control,$(call remove_unset_options,control MBEDTLS_THREADING_C MBEDTLS_THREADING_PTHREAD))
       THREADING := pthread
     endif