From 4ded7c6b1508f22189049539c94be2930f20364d Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 26 Apr 2024 17:54:15 -0400
Subject: config: Just use NOT to implement NOR

---
 config/flags.mk   |  7 ++++---
 config/prelude.mk | 16 ----------------
 2 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/config/flags.mk b/config/flags.mk
index ee13f06..837c30f 100644
--- a/config/flags.mk
+++ b/config/flags.mk
@@ -75,12 +75,13 @@ export TSAN_CFLAGS=${TSAN_CFLAGS,${_TSAN}}
 export UBSAN_CFLAGS=${UBSAN_CFLAGS,${_UBSAN}}
 
 SAN_CFLAGS,y := -fno-sanitize-recover=all
-NO_SAN := ${NOR,${_ASAN},${_LSAN},${_MSAN},${_TSAN},${_UBSAN}}
-SAN := ${NOT,${NO_SAN}}
+INSANE := ${NOT,${_ASAN}${_LSAN}${_MSAN}${_TSAN}${_UBSAN}}
+SAN := ${NOT,${INSANE}}
 export SAN_CFLAGS=${SAN_CFLAGS,${SAN}}
 
 # MSAN and TSAN both need all code to be instrumented
-NOLIBS ?= ${NOT,${NOR,${_MSAN},${_TSAN}}}
+YESLIBS := ${NOT,${_MSAN}${_TSAN}}
+NOLIBS ?= ${NOT,${YESLIBS}}
 export XNOLIBS=${NOLIBS}
 
 # gcov only intercepts fork()/exec() with -std=gnu*
diff --git a/config/prelude.mk b/config/prelude.mk
index 6b0b649..109e60c 100644
--- a/config/prelude.mk
+++ b/config/prelude.mk
@@ -70,24 +70,8 @@ TRUTHY,y := y
 TRUTHY,1 := y
 
 # Boolean operators are also implemented with nested expansion
-NOT,y :=
 NOT,  := y
 
-# Support up to 5 arguments
-AND,y         := y
-AND,y,y       := y
-AND,y,y,y     := y
-AND,y,y,y,y   := y
-AND,y,y,y,y,y := y
-
-# NOR can be defined without combinatorial explosion.
-# OR is just ${NOT,${NOR,...}}
-NOR,     := y
-NOR,,    := y
-NOR,,,   := y
-NOR,,,,  := y
-NOR,,,,, := y
-
 # Normalize ${V} to either "y" or ""
 IS_V := ${TRUTHY,${V}}
 
-- 
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