not yet

git-svn-id: https://svn.r-project.org/R/trunk@87681 00db46b3-68df-0310-9c12-caf00c1e9a41

src/include/R_ext/Boolean.h

@@ -1,6 +1,6 @@
 /*
  *  R : A Computer Language for Statistical Data Analysis
- *  Copyright (C) 2000, 2025 The R Core Team.
+ *  Copyright (C) 2000, 2001 The R Core Team.
  *
  *  This header file is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
@@ -29,22 +29,13 @@
 #undef FALSE
 #undef TRUE
 
-// Fer now, only when the compiler claims to be a C23 compiler.
-
-#if defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L
-typedef bool Rboolean;
-# define FALSE false
-# define TRUE true
-# define _R_RBOOLEAN_IS_BOOL_ 1
-#else
-#  ifdef  __cplusplus
+#ifdef  __cplusplus
 extern "C" {
-# endif
+#endif
 typedef enum { FALSE = 0, TRUE /*, MAYBE */ } Rboolean;
 
-# ifdef  __cplusplus
+#ifdef  __cplusplus
 }
-# endif
 #endif
 
 #endif /* R_EXT_BOOLEAN_H_ */

src/include/R_ext/RStartup.h

@@ -73,8 +73,7 @@ typedef struct
     R_SIZE_T max_vsize;
     R_SIZE_T max_nsize;
     R_SIZE_T ppsize;
-    // This used to be Rboolean, but that is not guaraneteed to have >= 16 bits
-    int NoRenviron : 16;
+    Rboolean NoRenviron : 16;
 	/* RstartVersion has been added in R 4.2.0. Earlier, NoRenviron was an
 	   int (normally 32-bit like Rboolean), so on most machines the
 	   version would become 0 when setting NoRenviron to FALSE in