unused context warnings

Message-ID: <20060221062711.GA16160@petdance.com>

p4raw-id: //depot/perl@27300

21 files changed, 165 insertions, 38 deletions

diff --git a/deb.c b/deb.c
index e246b1aa34..3907201014 100644
--- a/deb.c
+++ b/deb.c
@@ -47,6 +47,7 @@ Perl_deb(pTHX_ const char *pat, ...)
     vdeb(pat, &args);
     va_end(args);
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(pat);
 #endif /* DEBUGGING */
 }
@@ -62,6 +63,7 @@ Perl_vdeb(pTHX_ const char *pat, va_list *args)
 		  (long)CopLINE(PL_curcop));
     (void) PerlIO_vprintf(Perl_debug_log, pat, *args);
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(pat);
     PERL_UNUSED_ARG(args);
 #endif /* DEBUGGING */
@@ -133,6 +135,7 @@ S_deb_stack_n(pTHX_ SV** stack_base, I32 stack_min, I32 stack_max,
     while (1);
     PerlIO_printf(Perl_debug_log, "\n");
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(stack_base);
     PERL_UNUSED_ARG(stack_min);
     PERL_UNUSED_ARG(stack_max);
@@ -306,6 +309,8 @@ Perl_deb_stack_all(pTHX)
     } /* next stackinfo */
 
     PerlIO_printf(Perl_debug_log, "\n");
+#else
+    PERL_UNUSED_CONTEXT;
 #endif /* DEBUGGING */
 }
 
diff --git a/embed.pl b/embed.pl
index b0677c20b2..5aee84fdb7 100755
--- a/embed.pl
+++ b/embed.pl
@@ -876,14 +876,14 @@ START_EXTERN_C
 #undef PERLVARISC
 
 #define PERLVAR(v,t)	t* Perl_##v##_ptr(pTHX)				\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 #define PERLVARA(v,n,t)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 
 #define PERLVARI(v,t,i)	PERLVAR(v,t)
 #define PERLVARIC(v,t,i) PERLVAR(v, const t)
 #define PERLVARISC(v,i)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 
 #include "thrdvar.h"
 #include "intrpvar.h"
@@ -891,16 +891,16 @@ START_EXTERN_C
 #undef PERLVAR
 #undef PERLVARA
 #define PERLVAR(v,t)	t* Perl_##v##_ptr(pTHX)				\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #define PERLVARA(v,n,t)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #undef PERLVARIC
 #undef PERLVARISC
 #define PERLVARIC(v,t,i)	\
 			const t* Perl_##v##_ptr(pTHX)		\
-			{ return (const t *)&(PL_##v); }
+			{ PERL_UNUSED_CONTEXT; return (const t *)&(PL_##v); }
 #define PERLVARISC(v,i)	PL_##v##_t* Perl_##v##_ptr(pTHX)	\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #include "perlvars.h"
 
 #undef PERLVAR
@@ -915,15 +915,18 @@ START_EXTERN_C
 #undef PL_check
 #undef PL_fold_locale
 Perl_ppaddr_t** Perl_Gppaddr_ptr(pTHX) {
-    static const Perl_ppaddr_t* ppaddr_ptr = PL_ppaddr;
+    static const Perl_ppaddr_t* const ppaddr_ptr = PL_ppaddr;
+    PERL_UNUSED_CONTEXT;
     return (Perl_ppaddr_t**)&ppaddr_ptr;
 }
 Perl_check_t**  Perl_Gcheck_ptr(pTHX) {
-    static const Perl_check_t* check_ptr  = PL_check;
+    static const Perl_check_t* const check_ptr  = PL_check;
+    PERL_UNUSED_CONTEXT;
     return (Perl_check_t**)&check_ptr;
 }
 unsigned char** Perl_Gfold_locale_ptr(pTHX) {
-    static const unsigned char* fold_locale_ptr = PL_fold_locale;
+    static const unsigned char* const fold_locale_ptr = PL_fold_locale;
+    PERL_UNUSED_CONTEXT;
     return (unsigned char**)&fold_locale_ptr;
 }
 #endif
diff --git a/hv.c b/hv.c
index f68f38c56c..0923f9077e 100644
--- a/hv.c
+++ b/hv.c
@@ -1969,6 +1969,7 @@ Perl_hv_name_set(pTHX_ HV *hv, const char *name, I32 len, int flags)
 AV **
 Perl_hv_backreferences_p(pTHX_ HV *hv) {
     struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv);
+    PERL_UNUSED_CONTEXT;
     return &(iter->xhv_backreferences);
 }
 
diff --git a/locale.c b/locale.c
index a7f56dd2a8..dd3060f2a6 100644
--- a/locale.c
+++ b/locale.c
@@ -185,6 +185,7 @@ Perl_new_ctype(pTHX_ const char *newctype)
 
 #endif /* USE_LOCALE_CTYPE */
     PERL_UNUSED_ARG(newctype);
+    PERL_UNUSED_CONTEXT;
 }
 
 /*
diff --git a/mathoms.c b/mathoms.c
index 6cc018b30a..3636a9b0fe 100644
--- a/mathoms.c
+++ b/mathoms.c
@@ -1106,6 +1106,7 @@ potentially warn under some level of strict-ness.
 void
 Perl_sv_nolocking(pTHX_ SV *sv)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
 }
 
@@ -1125,6 +1126,7 @@ potentially warn under some level of strict-ness.
 void
 Perl_sv_nounlocking(pTHX_ SV *sv)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
 }
 
diff --git a/mg.c b/mg.c
index 004f3193f8..760517cd22 100644
--- a/mg.c
+++ b/mg.c
@@ -115,6 +115,7 @@ void
 Perl_mg_magical(pTHX_ SV *sv)
 {
     const MAGIC* mg;
+    PERL_UNUSED_CONTEXT;
     for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
 	const MGVTBL* const vtbl = mg->mg_virtual;
 	if (vtbl) {
@@ -347,6 +348,7 @@ Finds the magic pointer for type matching the SV.  See C<sv_magic>.
 MAGIC*
 Perl_mg_find(pTHX_ const SV *sv, int type)
 {
+    PERL_UNUSED_CONTEXT;
     if (sv) {
         MAGIC *mg;
         for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
@@ -2052,6 +2054,7 @@ Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
 int
 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
 {
+    PERL_UNUSED_CONTEXT;
     mg->mg_len = -1;
     SvSCREAM_off(sv);
     return 0;
@@ -2112,6 +2115,7 @@ Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
      * RenE<eacute> Descartes said "I think not."
      * and vanished with a faint plop.
      */
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
     if (mg->mg_ptr) {
 	Safefree(mg->mg_ptr);
@@ -2126,6 +2130,7 @@ Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
 int
 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
     Safefree(mg->mg_ptr);	/* The mg_ptr holds the pos cache. */
     mg->mg_ptr = 0;
@@ -2583,6 +2588,7 @@ I32
 Perl_whichsig(pTHX_ const char *sig)
 {
     register char* const* sigv;
+    PERL_UNUSED_CONTEXT;
 
     for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
 	if (strEQ(sig,*sigv))
diff --git a/miniperlmain.c b/miniperlmain.c
index bb49f5b88f..140711bf7d 100644
--- a/miniperlmain.c
+++ b/miniperlmain.c
@@ -123,6 +123,7 @@ main(int argc, char **argv, char **env)
 static void
 xs_init(pTHX)
 {
+    PERL_UNUSED_CONTEXT;
     dXSUB_SYS;
 }
 
diff --git a/numeric.c b/numeric.c
index 045834265c..6720726cfb 100644
--- a/numeric.c
+++ b/numeric.c
@@ -30,6 +30,7 @@ values, including such things as replacements for the OS's atof() function
 U32
 Perl_cast_ulong(pTHX_ NV f)
 {
+    PERL_UNUSED_CONTEXT;
   if (f < 0.0)
     return f < I32_MIN ? (U32) I32_MIN : (U32)(I32) f;
   if (f < U32_MAX_P1) {
@@ -48,6 +49,7 @@ Perl_cast_ulong(pTHX_ NV f)
 I32
 Perl_cast_i32(pTHX_ NV f)
 {
+    PERL_UNUSED_CONTEXT;
   if (f < I32_MAX_P1)
     return f < I32_MIN ? I32_MIN : (I32) f;
   if (f < U32_MAX_P1) {
@@ -66,6 +68,7 @@ Perl_cast_i32(pTHX_ NV f)
 IV
 Perl_cast_iv(pTHX_ NV f)
 {
+    PERL_UNUSED_CONTEXT;
   if (f < IV_MAX_P1)
     return f < IV_MIN ? IV_MIN : (IV) f;
   if (f < UV_MAX_P1) {
@@ -85,6 +88,7 @@ Perl_cast_iv(pTHX_ NV f)
 UV
 Perl_cast_uv(pTHX_ NV f)
 {
+    PERL_UNUSED_CONTEXT;
   if (f < 0.0)
     return f < IV_MIN ? (UV) IV_MIN : (UV)(IV) f;
   if (f < UV_MAX_P1) {
diff --git a/op.c b/op.c
index 62b0ca2c1a..d65bf1669b 100644
--- a/op.c
+++ b/op.c
@@ -485,6 +485,7 @@ void
 Perl_op_refcnt_lock(pTHX)
 {
     dVAR;
+    PERL_UNUSED_CONTEXT;
     OP_REFCNT_LOCK;
 }
 
@@ -492,6 +493,7 @@ void
 Perl_op_refcnt_unlock(pTHX)
 {
     dVAR;
+    PERL_UNUSED_CONTEXT;
     OP_REFCNT_UNLOCK;
 }
 
@@ -1792,6 +1794,7 @@ Perl_my(pTHX_ OP *o)
 OP *
 Perl_sawparens(pTHX_ OP *o)
 {
+    PERL_UNUSED_CONTEXT;
     if (o)
 	o->op_flags |= OPf_PARENS;
     return o;
@@ -4296,7 +4299,7 @@ Perl_cv_undef(pTHX_ CV *cv)
 	CvCONST_off(cv);
     }
     if (CvISXSUB(cv) && CvXSUB(cv)) {
-        CvXSUB(cv) = 0;
+	CvXSUB(cv) = NULL;
     }
     /* delete all flags except WEAKOUTSIDE */
     CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
@@ -4346,6 +4349,7 @@ L<perlsub/"Constant Functions">.
 SV *
 Perl_cv_const_sv(pTHX_ CV *cv)
 {
+    PERL_UNUSED_CONTEXT;
     if (!cv)
 	return NULL;
     if (!(SvTYPE(cv) == SVt_PVCV || SvTYPE(cv) == SVt_PVFM))
@@ -5205,6 +5209,7 @@ OP *
 Perl_ck_concat(pTHX_ OP *o)
 {
     const OP * const kid = cUNOPo->op_first;
+    PERL_UNUSED_CONTEXT;
     if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
 	    !(kUNOP->op_first->op_flags & OPf_MOD))
         o->op_flags |= OPf_STACKED;
@@ -6125,6 +6130,7 @@ Perl_ck_method(pTHX_ OP *o)
 OP *
 Perl_ck_null(pTHX_ OP *o)
 {
+    PERL_UNUSED_CONTEXT;
     return o;
 }
 
@@ -6759,6 +6765,7 @@ Perl_ck_subr(pTHX_ OP *o)
 OP *
 Perl_ck_svconst(pTHX_ OP *o)
 {
+    PERL_UNUSED_CONTEXT;
     SvREADONLY_on(cSVOPo->op_sv);
     return o;
 }
diff --git a/perl.c b/perl.c
index b970bf348a..d901cd5d4d 100644
--- a/perl.c
+++ b/perl.c
@@ -228,7 +228,7 @@ void
 perl_construct(pTHXx)
 {
     dVAR;
-    PERL_UNUSED_ARG(my_perl);
+    PERL_UNUSED_CONTEXT;
 #ifdef MULTIPLICITY
     init_interp();
     PL_perl_destruct_level = 1;
@@ -404,6 +404,7 @@ no threads.
 int
 Perl_nothreadhook(pTHX)
 {
+    PERL_UNUSED_CONTEXT;
     return 0;
 }
 
@@ -523,7 +524,7 @@ perl_destruct(pTHXx)
     pid_t child;
 #endif
 
-    PERL_UNUSED_ARG(my_perl);
+    PERL_UNUSED_CONTEXT;
 
     /* wait for all pseudo-forked children to finish */
     PERL_WAIT_FOR_CHILDREN;
@@ -2234,7 +2235,7 @@ perl_run(pTHXx)
     int ret = 0;
     dJMPENV;
 
-    PERL_UNUSED_ARG(my_perl);
+    PERL_UNUSED_CONTEXT;
 
     oldscope = PL_scopestack_ix;
 #ifdef VMS
diff --git a/perl.h b/perl.h
index 9f4e8069ca..505c122346 100644
--- a/perl.h
+++ b/perl.h
@@ -137,7 +137,7 @@
 #  endif
 #endif
 
-#define pVAR    register struct perl_vars* my_vars PERL_UNUSED_DECL
+#define pVAR    register struct perl_vars* const my_vars PERL_UNUSED_DECL
 
 #ifdef PERL_GLOBAL_STRUCT
 #  define dVAR		pVAR    = (struct perl_vars*)PERL_GET_VARS()
@@ -234,6 +234,12 @@
 #  define PERL_UNUSED_VAR(x) ((void)x)
 #endif
 
+#ifdef USE_ITHREADS
+#  define PERL_UNUSED_CONTEXT PERL_UNUSED_ARG(my_perl)
+#else
+#  define PERL_UNUSED_CONTEXT
+#endif
+
 #define NOOP (void)0
 #define dNOOP extern int Perl___notused PERL_UNUSED_DECL
 
diff --git a/perlapi.c b/perlapi.c
index 4ed010bb7f..d5ef77f471 100644
--- a/perlapi.c
+++ b/perlapi.c
@@ -38,14 +38,14 @@ START_EXTERN_C
 #undef PERLVARISC
 
 #define PERLVAR(v,t)	t* Perl_##v##_ptr(pTHX)				\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 #define PERLVARA(v,n,t)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 
 #define PERLVARI(v,t,i)	PERLVAR(v,t)
 #define PERLVARIC(v,t,i) PERLVAR(v, const t)
 #define PERLVARISC(v,i)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(aTHX->v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(aTHX->v); }
 
 #include "thrdvar.h"
 #include "intrpvar.h"
@@ -53,16 +53,16 @@ START_EXTERN_C
 #undef PERLVAR
 #undef PERLVARA
 #define PERLVAR(v,t)	t* Perl_##v##_ptr(pTHX)				\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #define PERLVARA(v,n,t)	PL_##v##_t* Perl_##v##_ptr(pTHX)		\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #undef PERLVARIC
 #undef PERLVARISC
 #define PERLVARIC(v,t,i)	\
 			const t* Perl_##v##_ptr(pTHX)		\
-			{ return (const t *)&(PL_##v); }
+			{ PERL_UNUSED_CONTEXT; return (const t *)&(PL_##v); }
 #define PERLVARISC(v,i)	PL_##v##_t* Perl_##v##_ptr(pTHX)	\
-			{ dVAR; return &(PL_##v); }
+			{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
 #include "perlvars.h"
 
 #undef PERLVAR
@@ -77,15 +77,18 @@ START_EXTERN_C
 #undef PL_check
 #undef PL_fold_locale
 Perl_ppaddr_t** Perl_Gppaddr_ptr(pTHX) {
-    static const Perl_ppaddr_t* ppaddr_ptr = PL_ppaddr;
+    static const Perl_ppaddr_t* const ppaddr_ptr = PL_ppaddr;
+    PERL_UNUSED_CONTEXT;
     return (Perl_ppaddr_t**)&ppaddr_ptr;
 }
 Perl_check_t**  Perl_Gcheck_ptr(pTHX) {
-    static const Perl_check_t* check_ptr  = PL_check;
+    static const Perl_check_t* const check_ptr  = PL_check;
+    PERL_UNUSED_CONTEXT;
     return (Perl_check_t**)&check_ptr;
 }
 unsigned char** Perl_Gfold_locale_ptr(pTHX) {
-    static const unsigned char* fold_locale_ptr = PL_fold_locale;
+    static const unsigned char* const fold_locale_ptr = PL_fold_locale;
+    PERL_UNUSED_CONTEXT;
     return (unsigned char**)&fold_locale_ptr;
 }
 #endif
diff --git a/perlio.c b/perlio.c
index f90108797d..92a2879ea1 100644
--- a/perlio.c
+++ b/perlio.c
@@ -358,6 +358,7 @@ Perl_boot_core_PerlIO(pTHX)
 void
 PerlIO_init(pTHX)
 {
+    PERL_UNUSED_CONTEXT;
     /*
      * Does nothing (yet) except force this file to be included in perl
      * binary. That allows this file to force inclusion of other functions
@@ -395,6 +396,7 @@ PerlIO_tmpfile(void)
 void
 PerlIO_init(pTHX)
 {
+    PERL_UNUSED_CONTEXT;
     /*
      * Force this file to be included in perl binary. Which allows this
      * file to force inclusion of other functions that may be required by
@@ -571,6 +573,7 @@ PerlIO_list_t *
 PerlIO_list_alloc(pTHX)
 {
     PerlIO_list_t *list;
+    PERL_UNUSED_CONTEXT;
     Newxz(list, 1, PerlIO_list_t);
     list->refcnt = 1;
     return list;
@@ -1833,6 +1836,7 @@ Perl_PerlIO_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, int cnt)
 IV
 PerlIOUtf8_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(mode);
     PERL_UNUSED_ARG(arg);
     if (PerlIOValid(f)) {
@@ -2000,6 +2004,7 @@ IV
 PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
 {
     PerlIOl * const l = PerlIOBase(f);
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(arg);
 
     l->flags &= ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE |
@@ -2058,6 +2063,7 @@ PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
 IV
 PerlIOBase_popped(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(f);
     return 0;
 }
@@ -2114,6 +2120,7 @@ PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
 IV
 PerlIOBase_noop_ok(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(f);
     return 0;
 }
@@ -2121,6 +2128,7 @@ PerlIOBase_noop_ok(pTHX_ PerlIO *f)
 IV
 PerlIOBase_noop_fail(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(f);
     return -1;
 }
@@ -2157,6 +2165,7 @@ PerlIOBase_close(pTHX_ PerlIO *f)
 IV
 PerlIOBase_eof(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     if (PerlIOValid(f)) {
 	return (PerlIOBase(f)->flags & PERLIO_F_EOF) != 0;
     }
@@ -2166,6 +2175,7 @@ PerlIOBase_eof(pTHX_ PerlIO *f)
 IV
 PerlIOBase_error(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     if (PerlIOValid(f)) {
 	return (PerlIOBase(f)->flags & PERLIO_F_ERROR) != 0;
     }
@@ -2186,6 +2196,7 @@ PerlIOBase_clearerr(pTHX_ PerlIO *f)
 void
 PerlIOBase_setlinebuf(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     if (PerlIOValid(f)) {
 	PerlIOBase(f)->flags |= PERLIO_F_LINEBUF;
     }
@@ -2289,6 +2300,8 @@ PerlIO_init(pTHX)
  /* Place holder for stdstreams call ??? */
 #ifdef USE_THREADS
     MUTEX_INIT(&PerlIO_mutex);
+#else
+    PERL_UNUSED_CONTEXT;
 #endif
 }
 
@@ -2438,6 +2451,7 @@ PerlIOUnix_oflags(const char *mode)
 IV
 PerlIOUnix_fileno(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
     return PerlIOSelf(f, PerlIOUnix)->fd;
 }
 
@@ -2460,6 +2474,7 @@ PerlIOUnix_setfd(pTHX_ PerlIO *f, int fd, int imode)
     s->fd = fd;
     s->oflags = imode;
     PerlIOUnix_refcnt_inc(fd);
+    PERL_UNUSED_CONTEXT;
 }
 
 IV
@@ -2487,6 +2502,7 @@ PerlIOUnix_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
 {
     const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
     Off_t new_loc;
+    PERL_UNUSED_CONTEXT;
     if (PerlIOBase(f)->flags & PERLIO_F_NOTREG) {
 #ifdef  ESPIPE
 	SETERRNO(ESPIPE, LIB_INVARG);
@@ -2630,6 +2646,8 @@ PerlIOUnix_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
 Off_t
 PerlIOUnix_tell(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     return PerlLIO_lseek(PerlIOSelf(f, PerlIOUnix)->fd, 0, SEEK_CUR);
 }
 
@@ -2715,6 +2733,8 @@ typedef struct {
 IV
 PerlIOStdio_fileno(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     if (PerlIOValid(f)) {
 	FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
 	if (s)
@@ -2936,6 +2956,8 @@ PerlIOStdio_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
 static int
 PerlIOStdio_invalidate_fileno(pTHX_ FILE *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     /* XXX this could use PerlIO_canset_fileno() and
      * PerlIO_set_fileno() support from Configure
      */
@@ -3217,6 +3239,8 @@ IV
 PerlIOStdio_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
 {
     FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
+    PERL_UNUSED_CONTEXT;
+
     return PerlSIO_fseek(stdio, offset, whence);
 }
 
@@ -3224,6 +3248,8 @@ Off_t
 PerlIOStdio_tell(pTHX_ PerlIO *f)
 {
     FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
+    PERL_UNUSED_CONTEXT;
+
     return PerlSIO_ftell(stdio);
 }
 
@@ -3231,6 +3257,8 @@ IV
 PerlIOStdio_flush(pTHX_ PerlIO *f)
 {
     FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
+    PERL_UNUSED_CONTEXT;
+
     if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
 	return PerlSIO_fflush(stdio);
     }
@@ -3257,24 +3285,32 @@ PerlIOStdio_flush(pTHX_ PerlIO *f)
 IV
 PerlIOStdio_eof(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     return PerlSIO_feof(PerlIOSelf(f, PerlIOStdio)->stdio);
 }
 
 IV
 PerlIOStdio_error(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     return PerlSIO_ferror(PerlIOSelf(f, PerlIOStdio)->stdio);
 }
 
 void
 PerlIOStdio_clearerr(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
     PerlSIO_clearerr(PerlIOSelf(f, PerlIOStdio)->stdio);
 }
 
 void
 PerlIOStdio_setlinebuf(pTHX_ PerlIO *f)
 {
+    PERL_UNUSED_CONTEXT;
+
 #ifdef HAS_SETLINEBUF
     PerlSIO_setlinebuf(PerlIOSelf(f, PerlIOStdio)->stdio);
 #else
@@ -3359,6 +3395,8 @@ PerlIOStdio_fill(pTHX_ PerlIO *f)
 {
     FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
     int c;
+    PERL_UNUSED_CONTEXT;
+
     /*
      * fflush()ing read-only streams can cause trouble on some stdio-s
      */
@@ -3965,6 +4003,8 @@ STDCHAR *
 PerlIOBuf_get_base(pTHX_ PerlIO *f)
 {
     PerlIOBuf * const b = PerlIOSelf(f, PerlIOBuf);
+    PERL_UNUSED_CONTEXT;
+
     if (!b->buf) {
 	if (!b->bufsiz)
 	    b->bufsiz = 4096;
diff --git a/pp_ctl.c b/pp_ctl.c
index 43cf175195..8d20d6f262 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -304,6 +304,7 @@ Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
 {
     UV *p = (UV*)*rsp;
     U32 i;
+    PERL_UNUSED_CONTEXT;
 
     if (!p || p[1] < rx->nparens) {
 #ifdef PERL_OLD_COPY_ON_WRITE
@@ -341,6 +342,7 @@ Perl_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
 {
     UV *p = (UV*)*rsp;
     U32 i;
+    PERL_UNUSED_CONTEXT;
 
     RX_MATCH_COPY_FREE(rx);
     RX_MATCH_COPIED_set(rx, *p);
@@ -367,6 +369,7 @@ void
 Perl_rxres_free(pTHX_ void **rsp)
 {
     UV * const p = (UV*)*rsp;
+    PERL_UNUSED_CONTEXT;
 
     if (p) {
 #ifdef PERL_POISON
@@ -3656,11 +3659,10 @@ PP(pp_leavegiven)
     I32 gimme;
     SV **newsp;
     PMOP *newpm;
-    SV **mark;
+    PERL_UNUSED_CONTEXT;
 
     POPBLOCK(cx,newpm);
     assert(CxTYPE(cx) == CXt_GIVEN);
-    mark = newsp;
 
     SP = newsp;
     PUTBACK;
diff --git a/regcomp.c b/regcomp.c
index bb109fed54..dba8bfb15a 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -5758,6 +5758,7 @@ Perl_regdump(pTHX_ regexp *r)
         });
     }
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(r);
 #endif	/* DEBUGGING */
 }
@@ -5963,6 +5964,7 @@ Perl_regprop(pTHX_ SV *sv, const regnode *o)
     else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
 	Perl_sv_catpvf(aTHX_ sv, "[-%d]", o->flags);
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
     PERL_UNUSED_ARG(o);
 #endif	/* DEBUGGING */
@@ -5973,6 +5975,8 @@ Perl_re_intuit_string(pTHX_ regexp *prog)
 {				/* Assume that RE_INTUIT is set */
     dVAR;
     GET_RE_DEBUG_FLAGS_DECL;
+    PERL_UNUSED_CONTEXT;
+
     DEBUG_COMPILE_r(
 	{
 	    const char * const s = SvPV_nolen_const(prog->check_substr
diff --git a/scope.c b/scope.c
index afb8678013..ff15c35de4 100644
--- a/scope.c
+++ b/scope.c
@@ -1060,6 +1060,7 @@ Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
 	break;
     }
 #else
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(cx);
 #endif	/* DEBUGGING */
 }
diff --git a/sv.c b/sv.c
index 1dc7283149..1f17c76637 100644
--- a/sv.c
+++ b/sv.c
@@ -435,6 +435,8 @@ Perl_sv_report_used(pTHX)
 {
 #ifdef DEBUGGING
     visit(do_report_used, 0, 0);
+#else
+    PERL_UNUSED_CONTEXT;
 #endif
 }
 
@@ -630,7 +632,7 @@ Perl_sv_free_arenas(pTHX)
 	struct arena_set *next, *aroot = (struct arena_set*) PL_body_arenas;
 	
 	for (; aroot; aroot = next) {
-	    int max = aroot->curr;
+	    const int max = aroot->curr;
 	    for (i=0; i<max; i++) {
 		assert(aroot->set[i].arena);
 		Safefree(aroot->set[i].arena);
@@ -1063,7 +1065,7 @@ S_more_bodies (pTHX_ svtype sv_type)
 {
     dVAR;
     void ** const root = &PL_body_roots[sv_type];
-    const struct body_details *bdp = &bodies_by_type[sv_type];
+    const struct body_details * const bdp = &bodies_by_type[sv_type];
     const size_t body_size = bdp->body_size;
     char *start;
     const char *end;
@@ -1393,6 +1395,7 @@ wrapper instead.
 int
 Perl_sv_backoff(pTHX_ register SV *sv)
 {
+    PERL_UNUSED_CONTEXT;
     assert(SvOOK(sv));
     assert(SvTYPE(sv) != SVt_PVHV);
     assert(SvTYPE(sv) != SVt_PVAV);
@@ -5162,6 +5165,7 @@ instead.
 SV *
 Perl_sv_newref(pTHX_ SV *sv)
 {
+    PERL_UNUSED_CONTEXT;
     if (sv)
 	(SvREFCNT(sv))++;
     return sv;
@@ -9348,6 +9352,7 @@ Perl_fp_dup(pTHX_ PerlIO *fp, char type, CLONE_PARAMS *param)
 DIR *
 Perl_dirp_dup(pTHX_ DIR *dp)
 {
+    PERL_UNUSED_CONTEXT;
     if (!dp)
 	return (DIR*)NULL;
     /* XXX TODO */
@@ -9460,6 +9465,8 @@ PTR_TBL_t *
 Perl_ptr_table_new(pTHX)
 {
     PTR_TBL_t *tbl;
+    PERL_UNUSED_CONTEXT;
+
     Newxz(tbl, 1, PTR_TBL_t);
     tbl->tbl_max	= 511;
     tbl->tbl_items	= 0;
@@ -9497,6 +9504,7 @@ void *
 Perl_ptr_table_fetch(pTHX_ PTR_TBL_t *tbl, const void *sv)
 {
     PTR_TBL_ENT_t const *const tblent = ptr_table_find(tbl, sv);
+    PERL_UNUSED_CONTEXT;
     return tblent ? tblent->newval : (void *) 0;
 }
 
@@ -9506,6 +9514,7 @@ void
 Perl_ptr_table_store(pTHX_ PTR_TBL_t *tbl, const void *oldsv, void *newsv)
 {
     PTR_TBL_ENT_t *tblent = S_ptr_table_find(tbl, oldsv);
+    PERL_UNUSED_CONTEXT;
 
     if (tblent) {
 	tblent->newval = newsv;
@@ -9533,6 +9542,7 @@ Perl_ptr_table_split(pTHX_ PTR_TBL_t *tbl)
     const UV oldsize = tbl->tbl_max + 1;
     UV newsize = oldsize * 2;
     UV i;
+    PERL_UNUSED_CONTEXT;
 
     Renew(ary, newsize, PTR_TBL_ENT_t*);
     Zero(&ary[oldsize], newsize-oldsize, PTR_TBL_ENT_t*);
diff --git a/toke.c b/toke.c
index 44eae03a86..1ef9b1812c 100644
--- a/toke.c
+++ b/toke.c
@@ -1215,7 +1215,7 @@ S_sublex_start(pTHX)
 	if (SvTYPE(sv) == SVt_PVIV) {
 	    /* Overloaded constants, nothing fancy: Convert to SVt_PV: */
 	    STRLEN len;
-	    const char *p = SvPV_const(sv, len);
+	    const char * const p = SvPV_const(sv, len);
 	    SV * const nsv = newSVpvn(p, len);
 	    if (SvUTF8(sv))
 		SvUTF8_on(nsv);
@@ -9552,6 +9552,7 @@ S_scan_ident(pTHX_ register char *s, register const char *send, char *dest, STRL
 void
 Perl_pmflag(pTHX_ U32* pmfl, int ch)
 {
+    PERL_UNUSED_CONTEXT;
     if (ch == 'i')
 	*pmfl |= PMf_FOLD;
     else if (ch == 'g')
@@ -10924,7 +10925,7 @@ S_set_csh(pTHX)
 	PL_cshlen = strlen(PL_cshname);
 #else
 #if defined(USE_ITHREADS)
-    PERL_UNUSED_ARG(my_perl);
+    PERL_UNUSED_CONTEXT;
 #endif
 #endif
 }
diff --git a/universal.c b/universal.c
index 2eeddb612f..98efe0f869 100644
--- a/universal.c
+++ b/universal.c
@@ -819,6 +819,7 @@ XS(XS_Internals_hv_clear_placehold)
 
 XS(XS_Regexp_DESTROY)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(cv);
 }
 
diff --git a/utf8.c b/utf8.c
index 1ab15cc29b..e5079cb709 100644
--- a/utf8.c
+++ b/utf8.c
@@ -238,6 +238,7 @@ STRLEN
 Perl_is_utf8_char(pTHX_ const U8 *s)
 {
     const STRLEN len = UTF8SKIP(s);
+    PERL_UNUSED_CONTEXT;
 #ifdef IS_UTF8_CHAR
     if (IS_UTF8_CHAR_FAST(len))
         return IS_UTF8_CHAR(s, len) ? len : 0;
@@ -264,6 +265,7 @@ Perl_is_utf8_string(pTHX_ const U8 *s, STRLEN len)
     const U8* x = s;
     const U8* send;
 
+    PERL_UNUSED_CONTEXT;
     if (!len)
 	len = strlen((const char *)s);
     send = s + len;
@@ -329,6 +331,7 @@ Perl_is_utf8_string_loclen(pTHX_ const U8 *s, STRLEN len, const U8 **ep, STRLEN
     const U8* x = s;
     const U8* send;
     STRLEN c;
+    PERL_UNUSED_CONTEXT;
 
     if (!len)
         len = strlen((const char *)s);
@@ -755,6 +758,7 @@ on the first byte of character or just after the last byte of a character.
 U8 *
 Perl_utf8_hop(pTHX_ const U8 *s, I32 off)
 {
+    PERL_UNUSED_CONTEXT;
     /* Note: cannot use UTF8_IS_...() too eagerly here since e.g
      * the bitops (especially ~) can create illegal UTF-8.
      * In other words: in Perl UTF-8 is not just for Unicode. */
@@ -835,6 +839,7 @@ Perl_bytes_from_utf8(pTHX_ const U8 *s, STRLEN *len, bool *is_utf8)
     const U8 *send;
     I32 count = 0;
 
+    PERL_UNUSED_CONTEXT;
     if (!*is_utf8)
         return (U8 *)start;
 
@@ -887,6 +892,7 @@ Perl_bytes_to_utf8(pTHX_ const U8 *s, STRLEN *len)
     const U8 * const send = s + (*len);
     U8 *d;
     U8 *dst;
+    PERL_UNUSED_CONTEXT;
 
     Newx(d, (*len) * 2 + 1, U8);
     dst = d;
diff --git a/util.c b/util.c
index 065a4c7e94..4022bb0830 100644
--- a/util.c
+++ b/util.c
@@ -340,6 +340,7 @@ char *
 Perl_delimcpy(pTHX_ register char *to, register const char *toend, register const char *from, register const char *fromend, register int delim, I32 *retlen)
 {
     register I32 tolen;
+    PERL_UNUSED_CONTEXT;
     for (tolen = 0; from < fromend; from++, tolen++) {
 	if (*from == '\\') {
 	    if (from[1] == delim)
@@ -369,6 +370,7 @@ char *
 Perl_instr(pTHX_ register const char *big, register const char *little)
 {
     register I32 first;
+    PERL_UNUSED_CONTEXT;
 
     if (!little)
 	return (char*)big;
@@ -400,6 +402,7 @@ Perl_instr(pTHX_ register const char *big, register const char *little)
 char *
 Perl_ninstr(pTHX_ const char *big, const char *bigend, const char *little, const char *lend)
 {
+    PERL_UNUSED_CONTEXT;
     if (little >= lend)
         return (char*)big;
     {
@@ -428,6 +431,7 @@ Perl_rninstr(pTHX_ register const char *big, const char *bigend, const char *lit
     register const char *bigbeg;
     register const I32 first = *little;
     register const char * const littleend = lend;
+    PERL_UNUSED_CONTEXT;
 
     if (little >= littleend)
 	return (char*)bigend;
@@ -829,6 +833,8 @@ Perl_ibcmp(pTHX_ const char *s1, const char *s2, register I32 len)
 {
     register const U8 *a = (const U8 *)s1;
     register const U8 *b = (const U8 *)s2;
+    PERL_UNUSED_CONTEXT;
+
     while (len--) {
 	if (*a != *b && *a != PL_fold[*b])
 	    return 1;
@@ -843,6 +849,8 @@ Perl_ibcmp_locale(pTHX_ const char *s1, const char *s2, register I32 len)
     dVAR;
     register const U8 *a = (const U8 *)s1;
     register const U8 *b = (const U8 *)s2;
+    PERL_UNUSED_CONTEXT;
+
     while (len--) {
 	if (*a != *b && *a != PL_fold_locale[*b])
 	    return 1;
@@ -869,6 +877,7 @@ be freed with the C<Safefree()> function.
 char *
 Perl_savepv(pTHX_ const char *pv)
 {
+    PERL_UNUSED_CONTEXT;
     if (!pv)
 	return NULL;
     else {
@@ -877,7 +886,6 @@ Perl_savepv(pTHX_ const char *pv)
 	Newx(newaddr,pvlen,char);
 	return memcpy(newaddr,pv,pvlen);
     }
-
 }
 
 /* same thing but with a known length */
@@ -897,6 +905,7 @@ char *
 Perl_savepvn(pTHX_ const char *pv, register I32 len)
 {
     register char *newaddr;
+    PERL_UNUSED_CONTEXT;
 
     Newx(newaddr,len+1,char);
     /* Give a meaning to NULL pointer mainly for the use in sv_magic() */
@@ -1659,6 +1668,7 @@ Perl_setenv_getix(pTHX_ const char *nam)
 {
     register I32 i;
     register const I32 len = strlen(nam);
+    PERL_UNUSED_CONTEXT;
 
     for (i = 0; environ[i]; i++) {
 	if (
@@ -2556,6 +2566,7 @@ Sighandler_t
 Perl_rsignal_state(pTHX_ int signo)
 {
     struct sigaction oact;
+    PERL_UNUSED_CONTEXT;
 
     if (sigaction(signo, (struct sigaction *)NULL, &oact) == -1)
 	return (Sighandler_t) SIG_ERR;
@@ -2861,6 +2872,7 @@ Perl_repeatcpy(pTHX_ register char *to, register const char *from, I32 len, regi
 {
     register I32 todo;
     register const char * const frombase = from;
+    PERL_UNUSED_CONTEXT;
 
     if (len == 1) {
 	register const char c = *from;
@@ -3202,32 +3214,37 @@ Perl_GetVars(pTHX)
 char **
 Perl_get_op_names(pTHX)
 {
- return (char **)PL_op_name;
+    PERL_UNUSED_CONTEXT;
+    return (char **)PL_op_name;
 }
 
 char **
 Perl_get_op_descs(pTHX)
 {
- return (char **)PL_op_desc;
+    PERL_UNUSED_CONTEXT;
+    return (char **)PL_op_desc;
 }
 
 const char *
 Perl_get_no_modify(pTHX)
 {
- return PL_no_modify;
+    PERL_UNUSED_CONTEXT;
+    return PL_no_modify;
 }
 
 U32 *
 Perl_get_opargs(pTHX)
 {
- return (U32 *)PL_opargs;
+    PERL_UNUSED_CONTEXT;
+    return (U32 *)PL_opargs;
 }
 
 PPADDR_t*
 Perl_get_ppaddr(pTHX)
 {
- dVAR;
- return (PPADDR_t*)PL_ppaddr;
+    dVAR;
+    PERL_UNUSED_CONTEXT;
+    return (PPADDR_t*)PL_ppaddr;
 }
 
 #ifndef HAS_GETENV_LEN
@@ -3235,6 +3252,7 @@ char *
 Perl_getenv_len(pTHX_ const char *env_elem, unsigned long *len)
 {
     char * const env_trans = PerlEnv_getenv(env_elem);
+    PERL_UNUSED_CONTEXT;
     if (env_trans)
 	*len = strlen(env_trans);
     return env_trans;
@@ -3246,6 +3264,7 @@ MGVTBL*
 Perl_get_vtbl(pTHX_ int vtbl_id)
 {
     const MGVTBL* result;
+    PERL_UNUSED_CONTEXT;
 
     switch(vtbl_id) {
     case want_vtbl_sv:
@@ -3545,6 +3564,7 @@ Perl_mini_mktime(pTHX_ struct tm *ptm)
     int secs;
     int month, mday, year, jday;
     int odd_cent, odd_year;
+    PERL_UNUSED_CONTEXT;
 
 #define	DAYS_PER_YEAR	365
 #define	DAYS_PER_QYEAR	(4*DAYS_PER_YEAR+1)
@@ -4854,6 +4874,7 @@ potentially warn under some level of strict-ness.
 void
 Perl_sv_nosharing(pTHX_ SV *sv)
 {
+    PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(sv);
 }
 
@@ -5037,6 +5058,7 @@ Perl_stashpv_hvname_match(pTHX_ const COP *c, const HV *hv)
 {
     const char * const stashpv = CopSTASHPV(c);
     const char * const name = HvNAME_get(hv);
+    PERL_UNUSED_CONTEXT;
 
     if (stashpv == name)
 	return TRUE;