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I have no idea what this is all about, but it works and Bruce hasn't

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complained so it cannot be entirely bad :-)

I include the email that probably explains it for people who already know:

> >Compiling with -O3 inlines functions.  However the function that is being
> >inlined in makeinfo.c (add_word_args()) is a vararg function and must not be
> >inlined.
> >
> >The code in question is K&R style, and AFIK, there is no way for the compiler
> >to determine that the function uses vararg.  Either change the code to use
> >prototypes, or use stdarg, or add a directive to prevent inlining.
>
> Not declaring a varargs function as varargs before it is used gives
> undefined behaviour.
>
> However, in practice the bug is probably in FreeBSD's <varargs.h>, which
> doesn't use gcc's __builtin_next_arg().  gcc should notice that it is
> used and not inline functions that have it.  <stdarg.h.> uses it, but I
> think there's another gcc builtin that it should be using.

Patch attached.  The ellipsis causes gcc to flag this as a varargs function,
and the name "__builtin_va_alist" is special cased in gcc to hide the last
argument in the arglist.

Reviewed by:	bde & phk
Submitted by:	jlemon@americantv.com (Jonathan Lemon)
This commit is contained in:
Poul-Henning Kamp 1997-02-07 20:22:15 +00:00
parent 9a969423ea
commit b7a652ab84
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=22415
2 changed files with 12 additions and 2 deletions
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7
sys/amd64/include/varargs.h
View File

@ -44,7 +44,12 @@
typedef char *va_list;
#define va_dcl int va_alist;
#ifdef __GNUC__
#define va_alist __builtin_va_alist
#define va_dcl int va_alist; ...
#else /* !__GNUC__ */
#define va_dcl int va_alist;
#endif
#define va_start(ap) \
ap = (char *)&va_alist

7
sys/i386/include/varargs.h
View File

@ -44,7 +44,12 @@
typedef char *va_list;
#define va_dcl int va_alist;
#ifdef __GNUC__
#define va_alist __builtin_va_alist
#define va_dcl int va_alist; ...
#else /* !__GNUC__ */
#define va_dcl int va_alist;
#endif
#define va_start(ap) \
ap = (char *)&va_alist