From f880b206a479bf4cd8ccac26f33a9cc3d490d6b7 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 24 Mar 2021 07:48:28 -0700
Subject: M1: Fix sed issue.

The MacOS sed doesn't accept semicolon termination for
commands involving defining labels or branching to labels.
This is not a new issue, but it is revealed on newer MacOS
because the sed now complains about unused labels.
In the sed command ':x; /whatever/ { ...; tx }', everything
after the initial : is interpreted as a label.

* Makefile (DEPGEN): Split the sed command's syntax up into
logical lines using multiple -e commands, applying some
formatting with indentation to try to keep it readable.
It looks like multiple -e options just glue together to
make a program, as if they were lines of code; one -e
can define a label referenced by another, and even the
closing brace can be treated as a separate command.
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 37eb677d..521b894f 100644
--- a/Makefile
+++ b/Makefile
@@ -112,7 +112,11 @@ ABBREVN = $(if $(VERBOSE),\
 ABBREV3 = $(if $(VERBOSE),@:,@printf "%s %s -> %s\n" $(1) "$(3)" $(2))
 
 define DEPGEN
-$(V)sed ':x; /\\$$/ { N; s/\\\n//; tx }' < $(1) | \
+$(V)sed -e ':x'                                         \
+        -e '/\\$$/ {'                                   \
+        -e   'N; s/\\\n//'                              \
+        -e   'tx'                                       \
+        -e '}' < $(1) |                                 \
   sed -e '1s/^/DEP_/' -e '1s/: [^ ]\+/ :=/' > $(1:.d=.v)
 endef
 
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