Assume C89 "volatile" keyword

The Configure changes here were generated using a version of metaconfig
that makes U/perl/perlxv.U assume that the keyword exists, and prevents
U/modified/d_volatile.U from promising to define a "volatile" keyword;
otherwise, those units would bring in the relevant Configure probe anyway.

26 files changed, 13 insertions, 161 deletions

diff --git a/Configure b/Configure
index 6a9dccc308..7dba1da880 100755
--- a/Configure
+++ b/Configure
@@ -928,7 +928,6 @@ d_vfork=''
 usevfork=''
 d_voidsig=''
 signal_t=''
-d_volatile=''
 d_charvspr=''
 d_vprintf=''
 d_wait4=''
@@ -16836,37 +16835,6 @@ eval $inlibc
 set quadmath.h i_quadmath
 eval $inhdr
 
-: check for volatile keyword
-echo " "
-echo 'Checking to see if your C compiler knows about "volatile"...' >&4
-$cat >try.c <<'EOCP'
-int main()
-{
-	typedef struct _goo_struct goo_struct;
-	goo_struct * volatile goo = ((goo_struct *)0);
-	struct _goo_struct {
-		long long_int;
-		int reg_int;
-		char char_var;
-	};
-	typedef unsigned short foo_t;
-	char *volatile foo;
-	volatile int bar;
-	volatile foo_t blech;
-	foo = foo;
-}
-EOCP
-if $cc -c $ccflags try.c >/dev/null 2>&1 ; then
-	val="$define"
-	echo "Yup, it does."
-else
-	val="$undef"
-	echo "Nope, it doesn't."
-fi
-set d_volatile
-eval $setvar
-$rm_try
-
 : Check basic sizes
 echo " "
 $echo "Choosing the C types to be used for Perl's internal types..." >&4
@@ -17060,10 +17028,6 @@ case "$i64type" in
 esac
 
 $echo "Checking how many bits of your UVs your NVs can preserve..." >&4
-: volatile so that the compiler has to store it out to memory.
-if test X"$d_volatile" = X"$define"; then
-	volatile=volatile
-fi
 $cat <<EOP >try.c
 #include <stdio.h>
 #$i_stdlib I_STDLIB
@@ -17073,7 +17037,8 @@ $cat <<EOP >try.c
 #include <sys/types.h>
 #include <signal.h>
 #ifdef SIGFPE
-$volatile int bletched = 0;
+/* volatile so that the compiler has to store it out to memory */
+volatile int bletched = 0;
 $signal_t blech(int s) { bletched = 1; }
 #endif
 int main() {
@@ -17124,10 +17089,6 @@ esac
 $rm_try
 
 $echo "Checking to find the largest integer value your NVs can hold..." >&4
-: volatile so that the compiler has to store it out to memory.
-if test X"$d_volatile" = X"$define"; then
-	volatile=volatile
-fi
 $cat <<EOP >try.c
 #include <stdio.h>
 
@@ -17139,10 +17100,11 @@ main() {
   int count = 1;
 
   while(count < 256) {
-    $volatile NV up = value + 1.0;
-    $volatile NV negated = -value;
-    $volatile NV down = negated - 1.0;
-    $volatile NV got_up = up - value;
+    /* volatile so that the compiler has to store it out to memory */
+    volatile NV up = value + 1.0;
+    volatile NV negated = -value;
+    volatile NV down = negated - 1.0;
+    volatile NV got_up = up - value;
     int up_good = got_up == 1.0;
     int got_down = down - negated;
     int down_good = got_down == -1.0;
@@ -17207,10 +17169,6 @@ fi
 $rm_try
 
 $echo "Checking whether NV 0.0 is all bits zero in memory..." >&4
-: volatile so that the compiler has to store it out to memory.
-if test X"$d_volatile" = X"$define"; then
-	volatile=volatile
-fi
 $cat <<EOP >try.c
 #include <stdio.h>
 #$i_stdlib I_STDLIB
@@ -17226,7 +17184,8 @@ $cat <<EOP >try.c
 #include <sys/types.h>
 #include <signal.h>
 #ifdef SIGFPE
-$volatile int bletched = 0;
+/* volatile so that the compiler has to store it out to memory */
+volatile int bletched = 0;
 $signal_t blech(int s) { bletched = 1; }
 #endif
 
@@ -24946,7 +24905,6 @@ d_vfork='$d_vfork'
 d_void_closedir='$d_void_closedir'
 d_voidsig='$d_voidsig'
 d_voidtty='$d_voidtty'
-d_volatile='$d_volatile'
 d_vprintf='$d_vprintf'
 d_vsnprintf='$d_vsnprintf'
 d_wait4='$d_wait4'
diff --git a/Cross/config.sh-arm-linux b/Cross/config.sh-arm-linux
index 9de265e073..51fca473e8 100644
--- a/Cross/config.sh-arm-linux
+++ b/Cross/config.sh-arm-linux
@@ -624,7 +624,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='define'
 d_wait4='define'
diff --git a/Cross/config.sh-arm-linux-n770 b/Cross/config.sh-arm-linux-n770
index c6903d0d0e..1739595746 100644
--- a/Cross/config.sh-arm-linux-n770
+++ b/Cross/config.sh-arm-linux-n770
@@ -496,7 +496,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='define'
 d_wait4='define'
diff --git a/NetWare/config.wc b/NetWare/config.wc
index 2f8f5553ea..31593db2a6 100644
--- a/NetWare/config.wc
+++ b/NetWare/config.wc
@@ -613,7 +613,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/NetWare/config_H.wc b/NetWare/config_H.wc
index 436b061929..5c67388239 100644
--- a/NetWare/config_H.wc
+++ b/NetWare/config_H.wc
@@ -597,15 +597,6 @@
  */
 /*#define HAS_USLEEP		/**/
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* HAS_WAIT4:
  *	This symbol, if defined, indicates that wait4() exists.
  */
diff --git a/Porting/Glossary b/Porting/Glossary
index 60536723ad..1e1deab174 100644
--- a/Porting/Glossary
+++ b/Porting/Glossary
@@ -2848,11 +2848,6 @@ d_voidtty (i_sysioctl.U):
 	Otherwise (on USG probably), it is enough to close the standard file
 	descriptors and do a setpgrp().
 
-d_volatile (d_volatile.U):
-	This variable conditionally defines the HASVOLATILE symbol, which
-	indicates to the C program that this C compiler knows about the
-	volatile declaration.
-
 d_vprintf (d_vprintf.U):
 	This variable conditionally defines the HAS_VPRINTF symbol, which
 	indicates to the C program that the vprintf() routine is available
diff --git a/Porting/config.sh b/Porting/config.sh
index a050b33ffb..61b921ced9 100644
--- a/Porting/config.sh
+++ b/Porting/config.sh
@@ -637,7 +637,6 @@ d_vfork='define'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='define'
 d_wait4='define'
diff --git a/Porting/config_H b/Porting/config_H
index 8ca64d8901..255303e72e 100644
--- a/Porting/config_H
+++ b/Porting/config_H
@@ -2748,15 +2748,6 @@
  */
 #define Signal_t void	/* Signal handler's return type */
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* I_DIRENT:
  *	This symbol, if defined, indicates to the C program that it should
  *	include <dirent.h>. Using this symbol also triggers the definition
diff --git a/config_h.SH b/config_h.SH
index 66039d3d61..e2ff49dab0 100755
--- a/config_h.SH
+++ b/config_h.SH
@@ -2168,15 +2168,6 @@ sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un
  */
 #define Signal_t $signal_t	/* Signal handler's return type */
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#$d_volatile	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* I_DIRENT:
  *	This symbol, if defined, indicates to the C program that it should
  *	include <dirent.h>. Using this symbol also triggers the definition
diff --git a/configure.com b/configure.com
index db85307a2f..f3048b84aa 100644
--- a/configure.com
+++ b/configure.com
@@ -6469,7 +6469,6 @@ $ WC "d_vms_shorten_long_symbols='" + d_vms_shorten_long_symbols + "'" ! VMS
 $ WC "d_void_closedir='define'"
 $ WC "d_voidsig='undef'"
 $ WC "d_voidtty='" + "'"
-$ WC "d_volatile='define'"
 $ WC "d_vprintf='define'"
 $ WC "d_vsnprintf='" + d_vsnprintf + "'"
 $ WC "d_wait4='" + d_wait4 + "'"
diff --git a/hints/mips.sh b/hints/mips.sh
index bc0b7e8073..61ab39af32 100644
--- a/hints/mips.sh
+++ b/hints/mips.sh
@@ -1,5 +1,4 @@
 perl_cflags='optimize="-g"'
-d_volatile=undef
 d_castneg=undef
 cc=cc
 glibpth="/usr/lib/cmplrs/cc $glibpth"
diff --git a/hints/ultrix_4.sh b/hints/ultrix_4.sh
index e7360821ff..f32f06dba3 100644
--- a/hints/ultrix_4.sh
+++ b/hints/ultrix_4.sh
@@ -38,10 +38,6 @@ case "$cc" in
     *4.2*)	ccflags="$ccflags -DLANGUAGE_C -Olimit 3800"
 		# Prototypes sometimes cause compilation errors in 4.2.
 		prototype=undef   
-		case "$myuname" in
-		*risc*)  d_volatile=undef ;;
-		esac
-		;;
     *4.3*)	ccflags="$ccflags -std1 -DLANGUAGE_C -Olimit 3800" ;;
     *)	ccflags="$ccflags -std -Olimit 3800" ;;
     esac
diff --git a/perl.h b/perl.h
index 7c698cfaab..1623057d20 100644
--- a/perl.h
+++ b/perl.h
@@ -570,11 +570,8 @@
 # define DONT_DECLARE_STD 1
 #endif
 
-#if defined(HASVOLATILE) || defined(STANDARD_C)
-#	define VOL volatile
-#else
-#   define VOL
-#endif
+/* This exists only for back-compat. */
+#define VOL volatile
 
 /* By compiling a perl with -DNO_TAINT_SUPPORT or -DSILENT_NO_TAINT_SUPPORT,
  * you get a perl without taint support, but doubtlessly with a lesser
diff --git a/plan9/config.plan9 b/plan9/config.plan9
index 4a2a305f75..1afcbaf1ea 100644
--- a/plan9/config.plan9
+++ b/plan9/config.plan9
@@ -607,15 +607,6 @@
  */
 /*#define HAS_USLEEP		/ **/
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile	/* config-skip */
-#endif
-
 /* HAS_WAIT4:
  *	This symbol, if defined, indicates that wait4() exists.
  */
diff --git a/plan9/config_h.sample b/plan9/config_h.sample
index 6e76bddca7..766426e1ec 100644
--- a/plan9/config_h.sample
+++ b/plan9/config_h.sample
@@ -565,15 +565,6 @@
  */
 /*#define HAS_USLEEP		/ **/
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* HAS_WAIT4:
  *	This symbol, if defined, indicates that wait4() exists.
  */
diff --git a/plan9/config_sh.sample b/plan9/config_sh.sample
index 6315595cc0..f35bb1fea6 100644
--- a/plan9/config_sh.sample
+++ b/plan9/config_sh.sample
@@ -623,7 +623,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/symbian/config.sh b/symbian/config.sh
index 2af4d0dae3..90980d7921 100644
--- a/symbian/config.sh
+++ b/symbian/config.sh
@@ -571,7 +571,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='undef'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/uconfig.h b/uconfig.h
index 17b0437036..125994bcac 100644
--- a/uconfig.h
+++ b/uconfig.h
@@ -2133,15 +2133,6 @@
  */
 #define Signal_t int	/* Signal handler's return type */
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-/*#define	HASVOLATILE	/ **/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* I_DIRENT:
  *	This symbol, if defined, indicates to the C program that it should
  *	include <dirent.h>. Using this symbol also triggers the definition
@@ -5366,6 +5357,6 @@
 #endif
 
 /* Generated from:
- * b0245f5f4da83b1e4e1dbcd8ffe33f50da89f790dc389b2868fc620cf460c375 config_h.SH
- * f8fa6d0de3a2fb09b8ae480de350caefa12b0272cc67b1bc9f7e02427a3e9a14 uconfig.sh
+ * de64a83defbfab2e684766a378e7304e30db7e2e8545430f86e0239f6850ac8a config_h.SH
+ * 034e09d42cd2ce87573eb1bd11b7169cb5a57d0d0741d379d39c1f3c4fc2f24e uconfig.sh
  * ex: set ro: */
diff --git a/uconfig.sh b/uconfig.sh
index b5a7d2555f..616eab666f 100644
--- a/uconfig.sh
+++ b/uconfig.sh
@@ -562,7 +562,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='undef'
 d_voidtty=''
-d_volatile='undef'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/uconfig64.sh b/uconfig64.sh
index 0751f9ae22..0842bad2fc 100644
--- a/uconfig64.sh
+++ b/uconfig64.sh
@@ -563,7 +563,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='undef'
 d_voidtty=''
-d_volatile='undef'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/win32/config.ce b/win32/config.ce
index 55a5f57726..8ae01597b7 100644
--- a/win32/config.ce
+++ b/win32/config.ce
@@ -611,7 +611,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='undef'
 d_wait4='undef'
diff --git a/win32/config.gc b/win32/config.gc
index 07d9a95afa..528dc93cd1 100644
--- a/win32/config.gc
+++ b/win32/config.gc
@@ -612,7 +612,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='define'
 d_wait4='undef'
diff --git a/win32/config.vc b/win32/config.vc
index a1b116438d..f0dc118b0f 100644
--- a/win32/config.vc
+++ b/win32/config.vc
@@ -612,7 +612,6 @@ d_vfork='undef'
 d_void_closedir='undef'
 d_voidsig='define'
 d_voidtty=''
-d_volatile='define'
 d_vprintf='define'
 d_vsnprintf='define'
 d_wait4='undef'
diff --git a/win32/config_H.ce b/win32/config_H.ce
index 8146c772e4..22cef32b43 100644
--- a/win32/config_H.ce
+++ b/win32/config_H.ce
@@ -547,15 +547,6 @@
  */
 /*#define HAS_USLEEP		/**/
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* HAS_WAIT4:
  *	This symbol, if defined, indicates that wait4() exists.
  */
diff --git a/win32/config_H.gc b/win32/config_H.gc
index f2dbf3125a..ddb834b59c 100644
--- a/win32/config_H.gc
+++ b/win32/config_H.gc
@@ -2142,15 +2142,6 @@
  */
 #define Signal_t void	/* Signal handler's return type */
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* I_DIRENT:
  *	This symbol, if defined, indicates to the C program that it should
  *	include <dirent.h>. Using this symbol also triggers the definition
diff --git a/win32/config_H.vc b/win32/config_H.vc
index 990c330cc3..0eb1f8a277 100644
--- a/win32/config_H.vc
+++ b/win32/config_H.vc
@@ -2133,15 +2133,6 @@
  */
 #define Signal_t void	/* Signal handler's return type */
 
-/* HASVOLATILE:
- *	This symbol, if defined, indicates that this C compiler knows about
- *	the volatile declaration.
- */
-#define	HASVOLATILE	/**/
-#ifndef HASVOLATILE
-#define volatile
-#endif
-
 /* I_DIRENT:
  *	This symbol, if defined, indicates to the C program that it should
  *	include <dirent.h>. Using this symbol also triggers the definition