[Buildroot] [PATCH] manual: fix manual generation with BR2_EXTERNAL support

[Samuel Martin]

Reported-by: Ryan Barnett <rjbarnet at rockwellcollins.com>
Signed-off-by: Samuel Martin <s.martin49 at gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 docs/manual/manual.mk         | 1 +
 support/scripts/kconfiglib.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/manual/manual.mk b/docs/manual/manual.mk
index d092d3f..99f2b84 100644
--- a/docs/manual/manual.mk
+++ b/docs/manual/manual.mk
@@ -1,6 +1,7 @@
 manual-update-lists:
 	$(Q)$(call MESSAGE,"Updating the manual lists...")
 	$(Q)BR2_DEFCONFIG="" TOPDIR=$(TOPDIR) O=$(O)/docs/manual/.build \
+		BR2_EXTERNAL=$(TOPDIR)/support/dummy-external \
 		$(TOPDIR)/support/scripts/gen-manual-lists.py
 
 ################################################################################
diff --git a/support/scripts/kconfiglib.py b/support/scripts/kconfiglib.py
index 0704cc0..e40947c 100644
--- a/support/scripts/kconfiglib.py
+++ b/support/scripts/kconfiglib.py
@@ -2074,7 +2074,7 @@ set_re   = re.compile(r"CONFIG_(\w+)=(.*)")
 unset_re = re.compile(r"# CONFIG_(\w+) is not set")
 
 # Regular expression for finding $-references to symbols in strings
-sym_ref_re = re.compile(r"\$[A-Za-z_]+")
+sym_ref_re = re.compile(r"\$[A-Za-z_][0-9A-Za-z_]*")
 
 # Integers representing symbol types
 UNKNOWN, BOOL, TRISTATE, STRING, HEX, INT = range(0, 6)
-- 
1.8.4