From e992c6a95939c8e1fe357bfce481e0d0c762c3c6 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 20 Jan 2026 13:06:16 -0300
Subject: Some compilation options configurable from makefile

Compilation options LUA_COMPAT_GLOBAL, LUA_COMPAT_LOOPVAR, and
LUA_READLINELIB do not affect the API, so they can be changed
through the make file.
---
 llex.c           |  2 +-
 lparser.c        |  4 ++--
 ltests.h         |  1 +
 luaconf.h        | 12 ++++++++++--
 manual/manual.of |  6 ++++++
 5 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/llex.c b/llex.c
index f8bb3ea4..7cd9fcaf 100644
--- a/llex.c
+++ b/llex.c
@@ -188,7 +188,7 @@ void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,
      so they cannot be collected */
   ls->envn = luaS_newliteral(L, LUA_ENV);  /* get env string */
   ls->brkn = luaS_newliteral(L, "break");  /* get "break" string */
-#if defined(LUA_COMPAT_GLOBAL)
+#if LUA_COMPAT_GLOBAL
   /* compatibility mode: "global" is not a reserved word */
   ls->glbn = luaS_newliteral(L, "global");  /* get "global" string */
   ls->glbn->extra = 0;  /* mark it as not reserved */
diff --git a/lparser.c b/lparser.c
index b27463af..6b87773e 100644
--- a/lparser.c
+++ b/lparser.c
@@ -1685,7 +1685,7 @@ static void forbody (LexState *ls, int base, int line, int nvars, int isgen) {
 /*
 ** Control whether for-loop control variables are read-only
 */
-#if defined(LUA_COMPAT_LOOPVAR)
+#if LUA_COMPAT_LOOPVAR
 #define LOOPVARKIND	VDKREG
 #else  /* by default, these variables are read only */
 #define LOOPVARKIND	RDKCONST
@@ -2120,7 +2120,7 @@ static void statement (LexState *ls) {
       gotostat(ls, line);
       break;
     }
-#if defined(LUA_COMPAT_GLOBAL)
+#if LUA_COMPAT_GLOBAL
     case TK_NAME: {
       /* compatibility code to parse global keyword when "global"
          is not reserved */
diff --git a/ltests.h b/ltests.h
index 93096da8..f5f14cd6 100644
--- a/ltests.h
+++ b/ltests.h
@@ -14,6 +14,7 @@
 /* test Lua with compatibility code */
 #define LUA_COMPAT_MATHLIB
 #undef LUA_COMPAT_GLOBAL
+#define LUA_COMPAT_GLOBAL	0
 
 
 #define LUA_DEBUG
diff --git a/luaconf.h b/luaconf.h
index f076c984..1b72e338 100644
--- a/luaconf.h
+++ b/luaconf.h
@@ -70,15 +70,19 @@
 #if defined(LUA_USE_LINUX)
 #define LUA_USE_POSIX
 #define LUA_USE_DLOPEN		/* needs an extra library: -ldl */
+#if !defined(LUA_READLINELIB)
 #define LUA_READLINELIB		"libreadline.so"
 #endif
+#endif
 
 
 #if defined(LUA_USE_MACOSX)
 #define LUA_USE_POSIX
 #define LUA_USE_DLOPEN		/* macOS does not need -ldl */
+#if !defined(LUA_READLINELIB)
 #define LUA_READLINELIB		"libedit.dylib"
 #endif
+#endif
 
 
 #if defined(LUA_USE_IOS)
@@ -339,14 +343,18 @@
 /*
 @@ LUA_COMPAT_GLOBAL avoids 'global' being a reserved word
 */
-#define LUA_COMPAT_GLOBAL
+#if !defined(LUA_COMPAT_GLOBAL)
+#define LUA_COMPAT_GLOBAL	1
+#endif
 
 
 /*
 @@ LUA_COMPAT_LOOPVAR makes for-loop control variables not read-only,
 ** as they were in previous versions.
 */
-/* #define LUA_COMPAT_LOOPVAR */
+#if !defined(LUA_COMPAT_LOOPVAR)
+#define LUA_COMPAT_LOOPVAR	0
+#endif
 
 
 /*
diff --git a/manual/manual.of b/manual/manual.of
index 5fa4e097..09075346 100644
--- a/manual/manual.of
+++ b/manual/manual.of
@@ -9594,12 +9594,18 @@ change between versions.
 @item{
 The word @Rw{global} is a reserved word.
 Do not use it as a regular name.
+
+The compilation option @id{LUA_COMPAT_GLOBAL} (see @id{luaconf.h})
+makes @id{global} a regular word.
 }
 
 @item{
 The control variable in @Rw{for} loops is read only.
 If you need to change it,
 declare a local variable with the same name in the loop body.
+
+The compilation option @id{LUA_COMPAT_LOOPVAR} (see @id{luaconf.h})
+makes these variables regular (writable).
 }
 
 @item{
-- 
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