From a44ceb8eed3b07435791041547cd2f83c470d7be Mon Sep 17 00:00:00 2001
From: Charles Bailey <bailey@newman.upenn.edu>
Date: Wed, 9 Feb 2000 10:44:22 +0000
Subject: [PATCH] Work around prefixing bug in older DECC preprocessors

p4raw-id: //depot/vmsperl@5052
---
 vms/vms.c    | 21 +++++++++++++++++++++
 vms/vmsish.h | 30 ++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/vms/vms.c b/vms/vms.c
index a3b0306..fac9243 100644
--- a/vms/vms.c
+++ b/vms/vms.c
@@ -3971,6 +3971,27 @@ static long int utc_offset_secs;
 #  define RTL_USES_UTC 1
 #endif
 
+/*
+ * DEC C previous to 6.0 corrupts the behavior of the /prefix
+ * qualifier with the extern prefix pragma.  This provisional
+ * hack circumvents this prefix pragma problem in previous 
+ * precompilers.
+ */
+#if defined(__VMS_VER) && __VMS_VER >= 70000000 
+#  if defined(VMS_WE_ARE_CASE_SENSITIVE) && (__DECC_VER < 60000000)
+#    pragma __extern_prefix save
+#    pragma __extern_prefix ""  /* set to empty to prevent prefixing */
+#    define gmtime decc$__utctz_gmtime
+#    define localtime decc$__utctz_localtime
+#    define time decc$__utc_time
+#    pragma __extern_prefix restore
+
+     struct tm *gmtime(), *localtime();   
+
+#  endif
+#endif
+
+
 static time_t toutc_dst(time_t loc) {
   struct tm *rsltmp;
 
diff --git a/vms/vmsish.h b/vms/vmsish.h
index e9b47a0..8d4a8ca 100644
--- a/vms/vmsish.h
+++ b/vms/vmsish.h
@@ -198,6 +198,16 @@
  */
 #define ALTERNATE_SHEBANG "$"
 
+/* Lower case entry points for these are missing in some earlier RTLs 
+ * so we borrow the defines and declares from errno.h and upcase them.
+ */
+#if defined(VMS_WE_ARE_CASE_SENSITIVE) && (__DECC_VER < 50500000)
+#  define errno      (*CMA$TIS_ERRNO_GET_ADDR())
+#  define vaxc$errno (*CMA$TIS_VMSERRNO_GET_ADDR())
+   int *CMA$TIS_ERRNO_GET_ADDR     (void);   /* UNIX style error code        */
+   int *CMA$TIS_VMSERRNO_GET_ADDR  (void);   /* VMS error (errno == EVMSERR) */
+#endif
+
 /* Macros to set errno using the VAX thread-safe calls, if present */
 #if (defined(__DECC) || defined(__DECCXX)) && !defined(__ALPHA)
 #  define set_errno(v)      (cma$tis_errno_set_value(v))
@@ -537,6 +547,25 @@ struct mystat
 };
 typedef unsigned mydev_t;
 typedef unsigned myino_t;
+
+/*
+ * DEC C previous to 6.0 corrupts the behavior of the /prefix
+ * qualifier with the extern prefix pragma.  This provisional
+ * hack circumvents this prefix pragma problem in previous 
+ * precompilers.
+ */
+#if defined(__VMS_VER) && __VMS_VER >= 70000000
+#  if defined(VMS_WE_ARE_CASE_SENSITIVE) && (__DECC_VER < 60000000)
+#    pragma __extern_prefix save
+#    pragma __extern_prefix ""  /* set to empty to prevent prefixing */
+#    define geteuid decc$__unix_geteuid
+#    define getuid decc$__unix_getuid
+#    define stat(__p1,__p2)   decc$__utc_stat(__p1,__p2)
+#    define fstat(__p1,__p2)  decc$__utc_fstat(__p1,__p2)
+#    pragma __extern_prefix restore
+#  endif
+#endif
+
 #ifndef DONT_MASK_RTL_CALLS  /* defined for vms.c so we can see RTL calls */
 #  ifdef stat
 #    undef stat
@@ -556,6 +585,7 @@ typedef unsigned myino_t;
 #define S_IDGRP (S_IWGRP | S_IXGRP)
 #define S_IDOTH (S_IWOTH | S_IXOTH)
 
+
 /* Prototypes for functions unique to vms.c.  Don't include replacements
  * for routines in the mainline source files excluded by #ifndef VMS;
  * their prototypes are already in proto.h.
-- 
2.7.4