Use new paradigm for hdr file double inclusion guard

We changed to use symbols not likely to be used by non-Perl code that
could conflict, and which have trailing underbars, so they don't look
like a regular Perl #define.

See https://rt.perl.org/Ticket/Display.html?id=131110

There are many more header files which are not guarded.

17 files changed, 47 insertions, 47 deletions

diff --git a/XSUB.h b/XSUB.h
index ec7b58db95..cff8204940 100644
--- a/XSUB.h
+++ b/XSUB.h
@@ -8,8 +8,8 @@
  *
  */
 
-#ifndef _INC_PERL_XSUB_H
-#define _INC_PERL_XSUB_H 1
+#ifndef PERL_XSUB_H_
+#define PERL_XSUB_H_ 1
 
 /* first, some documentation for xsubpp-generated items */
 
@@ -703,7 +703,7 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 #  endif  /* NO_XSLOCKS */
 #endif  /* PERL_IMPLICIT_SYS && !PERL_CORE */
 
-#endif /* _INC_PERL_XSUB_H */		/* include guard */
+#endif /* PERL_XSUB_H_ */		/* include guard */
 
 /*
  * ex: set ts=8 sts=4 sw=4 et:
diff --git a/dquote_inline.h b/dquote_inline.h
index 1c7694d89f..f0ce9d6280 100644
--- a/dquote_inline.h
+++ b/dquote_inline.h
@@ -6,8 +6,8 @@
  *    License or the Artistic License, as specified in the README file.
  */
 
-#ifndef DQUOTE_INLINE_H /* Guard against nested #inclusion */
-#define DQUOTE_INLINE_H
+#ifndef PERL_DQUOTE_INLINE_H_ /* Guard against nested #inclusion */
+#define PERL_DQUOTE_INLINE_H_
 
 /*
  - regcurly - a little FSA that accepts {\d+,?\d*}
@@ -64,4 +64,4 @@ S_form_short_octal_warning(pTHX_
                      (int) (s - sans_leading_zeros), sans_leading_zeros,
                      *s);
 }
-#endif  /* DQUOTE_INLINE_H */
+#endif  /* PERL_DQUOTE_INLINE_H_ */
diff --git a/ebcdic_tables.h b/ebcdic_tables.h
index c36ab961f0..69ab372d11 100644
--- a/ebcdic_tables.h
+++ b/ebcdic_tables.h
@@ -5,8 +5,8 @@
  */
 
 
-#ifndef H_EBCDIC_TABLES   /* Guard against nested #includes */
-#define H_EBCDIC_TABLES   1
+#ifndef PERL_EBCDIC_TABLES_H_   /* Guard against nested #includes */
+#define PERL_EBCDIC_TABLES_H_   1
 
 /* This file contains definitions for various tables used in EBCDIC handling.
  * More info is in utfebcdic.h */
@@ -437,6 +437,6 @@ EXTCONST U8 PL_fold_latin1[] = {
 
 #endif	/* EBCDIC 037 */
 
-#endif /* H_EBCDIC_TABLES */
+#endif /* PERL_EBCDIC_TABLES_H_ */
 
 /* ex: set ro: */
diff --git a/handy.h b/handy.h
index 80f9cf4b76..c3848bfe65 100644
--- a/handy.h
+++ b/handy.h
@@ -11,8 +11,8 @@
 /* IMPORTANT NOTE: Everything whose name begins with an underscore is for
  * internal core Perl use only. */
 
-#ifndef HANDY_H /* Guard against nested #inclusion */
-#define HANDY_H
+#ifndef PERL_HANDY_H_ /* Guard against nested #inclusion */
+#define PERL_HANDY_H_
 
 #if !defined(__STDC__)
 #ifdef NULL
@@ -2521,7 +2521,7 @@ void Perl_mem_log_del_sv(const SV *sv, const char *filename, const int linenumbe
 
 #endif
 
-#endif  /* HANDY_H */
+#endif  /* PERL_HANDY_H_ */
 
 /*
  * ex: set ts=8 sts=4 sw=4 et:
diff --git a/malloc_ctl.h b/malloc_ctl.h
index d74637289b..0c72e9afcf 100644
--- a/malloc_ctl.h
+++ b/malloc_ctl.h
@@ -1,5 +1,5 @@
-#ifndef MALLOC_CTL_H
-#  define MALLOC_CTL_H
+#ifndef PERL_MALLOC_CTL_H_
+#  define PERL_MALLOC_CTL_H_
 
 struct perl_mstats {
     UV *nfree;
diff --git a/perlio.h b/perlio.h
index 1a3d480f43..d515020618 100644
--- a/perlio.h
+++ b/perlio.h
@@ -8,8 +8,8 @@
  *
  */
 
-#ifndef _PERLIO_H
-#define _PERLIO_H
+#ifndef PERLIO_H_
+#define PERLIO_H_
 /*
   Interface for perl to IO functions.
   There is a hierarchy of Configure determined #define controls:
@@ -336,7 +336,7 @@ typedef struct PerlIO_list_s PerlIO_list_t;
 #endif
 
 END_EXTERN_C
-#endif				/* _PERLIO_H */
+#endif				/* PERLIO_H_ */
 
 /*
  * ex: set ts=8 sts=4 sw=4 et:
diff --git a/perliol.h b/perliol.h
index d15c937150..40b4224e50 100644
--- a/perliol.h
+++ b/perliol.h
@@ -1,5 +1,5 @@
-#ifndef _PERLIOL_H
-#define _PERLIOL_H
+#ifndef PERLIOL_H_
+#define PERLIOL_H_
 
 typedef struct {
     PerlIO_funcs *funcs;
@@ -286,7 +286,7 @@ PERL_CALLCONV SSize_t   PerlIOUnix_write(pTHX_ PerlIO *f, const void *vbuf, Size
 /* Utf8 */
 PERL_CALLCONV IV        PerlIOUtf8_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab);
 
-#endif				/* _PERLIOL_H */
+#endif				/* PERLIOL_H_ */
 
 /*
  * ex: set ts=8 sts=4 sw=4 et:
diff --git a/reentr.h b/reentr.h
index b1f3c80615..b220b1ee53 100644
--- a/reentr.h
+++ b/reentr.h
@@ -12,8 +12,8 @@
  * Any changes made here will be lost!
  */
 
-#ifndef REENTR_H
-#define REENTR_H
+#ifndef PERL_REENTR_H_
+#define PERL_REENTR_H_
 
 /* If compiling for a threaded perl, we will macro-wrap the system/library
  * interfaces (e.g. getpwent()) which have threaded versions
diff --git a/regcharclass.h b/regcharclass.h
index ff00207ec0..787957414c 100644
--- a/regcharclass.h
+++ b/regcharclass.h
@@ -15,8 +15,8 @@
  */
 
 
-#ifndef H_REGCHARCLASS   /* Guard against nested #includes */
-#define H_REGCHARCLASS 1
+#ifndef PERL_REGCHARCLASS_H_ /* Guard against nested #includes */
+#define PERL_REGCHARCLASS_H_
 
 #if 'A' == 65 /* ASCII/Latin1 */
 /*
@@ -1851,7 +1851,7 @@
 
 #endif	/* EBCDIC 037 */
 
-#endif /* H_REGCHARCLASS */
+#endif /* PERL_REGCHARCLASS_H_ */
 
 /* Generated from:
  * 59e717586b720a821ee0d7397679d5322e38b49f6fb7840545aedf669c733b70 lib/Unicode/UCD.pm
@@ -1900,6 +1900,6 @@
  * 717985d5fe0830f5b72ca21287a7d9f15ba6a383c29fbd3c47231d5f63edb68b lib/unicore/mktables
  * cdecb300baad839a6f62791229f551a4fa33f3cbdca08e378dc976466354e778 lib/unicore/version
  * 913d2f93f3cb6cdf1664db888bf840bc4eb074eef824e082fceda24a9445e60c regen/charset_translations.pl
- * c468aea5062ef84422219d74e83b6f3216f2823544b445f53ee1af71deeb2044 regen/regcharclass.pl
+ * 9ea6338945a7d70e5ea4b31ac7856c0b521df96be002e94b4b3b7d31debbf3ab regen/regcharclass.pl
  * 393f8d882713a3ba227351ad0f00ea4839fda74fcf77dcd1cdf31519925adba5 regen/regcharclass_multi_char_folds.pl
  * ex: set ro: */
diff --git a/regen/ebcdic.pl b/regen/ebcdic.pl
index a3e049d2ad..5fd4ecda14 100644
--- a/regen/ebcdic.pl
+++ b/regen/ebcdic.pl
@@ -46,8 +46,8 @@ sub output_table ($$;$) {
 
 print $out_fh <<END;
 
-#ifndef H_EBCDIC_TABLES   /* Guard against nested #includes */
-#define H_EBCDIC_TABLES   1
+#ifndef PERL_EBCDIC_TABLES_H_   /* Guard against nested #includes */
+#define PERL_EBCDIC_TABLES_H_   1
 
 /* This file contains definitions for various tables used in EBCDIC handling.
  * More info is in utfebcdic.h */
@@ -222,6 +222,6 @@ END
     print $out_fh get_conditional_compile_line_end();
 }
 
-print $out_fh "\n#endif /* H_EBCDIC_TABLES */\n";
+print $out_fh "\n#endif /* PERL_EBCDIC_TABLES_H_ */\n";
 
 read_only_bottom_close_and_rename($out_fh);
diff --git a/regen/reentr.pl b/regen/reentr.pl
index b73193ce56..1fc14e21ca 100644
--- a/regen/reentr.pl
+++ b/regen/reentr.pl
@@ -62,8 +62,8 @@ sub open_print_header {
 
 my $h = open_print_header('reentr.h');
 print $h <<EOF;
-#ifndef REENTR_H
-#define REENTR_H
+#ifndef PERL_REENTR_H_
+#define PERL_REENTR_H_
 
 /* If compiling for a threaded perl, we will macro-wrap the system/library
  * interfaces (e.g. getpwent()) which have threaded versions
diff --git a/regen/regcharclass.pl b/regen/regcharclass.pl
index 510fb8931d..83925e19d5 100755
--- a/regen/regcharclass.pl
+++ b/regen/regcharclass.pl
@@ -1364,7 +1364,7 @@ WARNING: These macros are for internal Perl core use only, and may be
 changed or removed without notice.
 EOF
     );
-    print $out_fh "\n#ifndef H_REGCHARCLASS   /* Guard against nested #includes */\n#define H_REGCHARCLASS 1\n";
+    print $out_fh "\n#ifndef PERL_REGCHARCLASS_H_ /* Guard against nested #includes */\n#define PERL_REGCHARCLASS_H_\n";
 
     my ( $op, $title, @txt, @types, %mods );
     my $doit= sub ($) {
@@ -1452,7 +1452,7 @@ EOF
         print $out_fh get_conditional_compile_line_end();
     }
 
-    print $out_fh "\n#endif /* H_REGCHARCLASS */\n";
+    print $out_fh "\n#endif /* PERL_REGCHARCLASS_H_ */\n";
 
     if($path eq '-') {
 	print $out_fh "/* ex: set ro: */\n";
diff --git a/regen/unicode_constants.pl b/regen/unicode_constants.pl
index cbe317926c..64ae84a649 100644
--- a/regen/unicode_constants.pl
+++ b/regen/unicode_constants.pl
@@ -12,8 +12,8 @@ my $out_fh = open_new('unicode_constants.h', '>',
 
 print $out_fh <<END;
 
-#ifndef H_UNICODE_CONSTANTS   /* Guard against nested #includes */
-#define H_UNICODE_CONSTANTS   1
+#ifndef PERL_UNICODE_CONSTANTS_H_   /* Guard against nested #includes */
+#define PERL_UNICODE_CONSTANTS_H_   1
 
 /* This file contains #defines for the version of Unicode being used and
  * various Unicode code points.  The values the code point macros expand to
@@ -198,7 +198,7 @@ if (@cwcm) {
     }
 }
 
-print $out_fh "\n#endif /* H_UNICODE_CONSTANTS */\n";
+print $out_fh "\n#endif /* PERL_UNICODE_CONSTANTS_H_ */\n";
 
 read_only_bottom_close_and_rename($out_fh);
 
diff --git a/time64.h b/time64.h
index 78efc73489..c0657665e9 100644
--- a/time64.h
+++ b/time64.h
@@ -1,8 +1,8 @@
 #include <time.h>
 #include "time64_config.h"
 
-#ifndef TIME64_H
-#    define TIME64_H
+#ifndef PERL_TIME64_H_
+#    define PERL_TIME64_H_
 
 
 /* Set our custom types */
diff --git a/time64_config.h b/time64_config.h
index 42cc12c88e..0bebebb53c 100644
--- a/time64_config.h
+++ b/time64_config.h
@@ -1,5 +1,5 @@
-#ifndef TIME64_CONFIG_H
-#    define TIME64_CONFIG_H
+#ifndef PERL_TIME64_CONFIG_H_
+#    define PERL_TIME64_CONFIG_H_
 
 /* Configuration
    -------------
@@ -82,4 +82,4 @@
 #define SYSTEM_GMTIME_MAX       CAT2(GMTIME_MAX,.0)
 #define SYSTEM_GMTIME_MIN       CAT2(GMTIME_MIN,.0)
 
-#endif /* TIME64_CONFIG_H */
+#endif /* PERL_TIME64_CONFIG_H_ */
diff --git a/unicode_constants.h b/unicode_constants.h
index 1c0e62e356..318b9015ae 100644
--- a/unicode_constants.h
+++ b/unicode_constants.h
@@ -5,8 +5,8 @@
  */
 
 
-#ifndef H_UNICODE_CONSTANTS   /* Guard against nested #includes */
-#define H_UNICODE_CONSTANTS   1
+#ifndef PERL_UNICODE_CONSTANTS_H_   /* Guard against nested #includes */
+#define PERL_UNICODE_CONSTANTS_H_   1
 
 /* This file contains #defines for the version of Unicode being used and
  * various Unicode code points.  The values the code point macros expand to
@@ -182,6 +182,6 @@ bytes.
 /* The highest code point that has any type of case change */
 #define HIGHEST_CASE_CHANGING_CP_FOR_USE_ONLY_BY_UTF8_DOT_C  0x1E943
 
-#endif /* H_UNICODE_CONSTANTS */
+#endif /* PERL_UNICODE_CONSTANTS_H_ */
 
 /* ex: set ro: */
diff --git a/utf8.h b/utf8.h
index 7b2ba14aa9..41db2f4b93 100644
--- a/utf8.h
+++ b/utf8.h
@@ -14,8 +14,8 @@
  *
  */
 
-#ifndef H_UTF8      /* Guard against recursive inclusion */
-#define H_UTF8 1
+#ifndef PERL_UTF8_H_      /* Guard against recursive inclusion */
+#define PERL_UTF8_H_ 1
 
 /* Use UTF-8 as the default script encoding?
  * Turning this on will break scripts having non-UTF-8 binary
@@ -1169,7 +1169,7 @@ L</is_utf8_string_loclen_flags> to check entire strings.
  * retained solely for backwards compatibility */
 #define IS_UTF8_CHAR(p, n)      (isUTF8_CHAR(p, (p) + (n)) == n)
 
-#endif /* H_UTF8 */
+#endif /* PERL_UTF8_H_ */
 
 /*
  * ex: set ts=8 sts=4 sw=4 et: