Adding support for Visual C's __declspec(noreturn) function declarations to perl

This will reduce the machine code size on Visual C Perl, by removing C stack
clean up opcodes and possible jmp opcodes after croak() and similar
functions.  Perl's existing __attribute__noreturn__ macro (and therefore
GCC's __attribute__((noreturn)) ) is fundamentally incompatible with MS's
implementation for noreturn functions. win32.h already has _MSC_VER
aware code blocks, so adding more isn't a problem.

1 files changed, 4 insertions, 0 deletions

diff --git a/perl.h b/perl.h
index fe659040cc..a7cd37ac21 100644
--- a/perl.h
+++ b/perl.h
@@ -5024,6 +5024,10 @@ struct tempsym; /* defined in pp_pack.c */
 #    define PERL_CALLCONV
 #  endif
 #endif
+#ifndef PERL_CALLCONV_NO_RET
+#    define PERL_CALLCONV_NO_RET PERL_CALLCONV
+#endif
+
 #undef PERL_CKDEF
 #undef PERL_PPDEF
 #define PERL_CKDEF(s)	PERL_CALLCONV OP *s (pTHX_ OP *o);