I've fetched the latest gnulib CVS and tried testing the xvasprintf
module on AIX 5.3:
$ ./gnulib-tool --create-testdir --dir=/home/china/tmp/z xvasprintf
$ cd /home/china/tmp/z
$ ./configure CC=xlc --disable-dependency-tracking
...
$ gmake
...
$ nm -BCpg gllib/libgnu.a|grep va_copy
- U .va_copy
During the build, the following warnings occur:
...
xlc -DHAVE_CONFIG_H -I. -I. -I.. -g -c vasnprintf.c
"/usr/include/stdarg.h", line 89.9: 1506-236 (W) Macro name va_copy has been
redefined.
"/usr/include/stdarg.h", line 89.9: 1506-358 (I) "va_copy" is defined on line
163 of ../config.h.
xlc -DHAVE_CONFIG_H -I. -I. -I.. -g -c vasprintf.c
"/usr/include/stdarg.h", line 89.9: 1506-236 (W) Macro name va_copy has been
redefined.
"/usr/include/stdarg.h", line 89.9: 1506-358 (I) "va_copy" is defined on line
163 of ../config.h.
If I build with the C99 variant of the compiler, va_copy isn't
undefined in gllib/libgnu.a nor are there any warnings during the
build:
$ ./configure CC=xlc CFLAGS=-qlanglvl=extc99 \
--disable-dependency-tracking
I'm not really sure what the xlc compiler is doing with va_copy(). In
<stdarg.h>, we have:
88: #ifdef _ISOC99_SOURCE
89: #define va_copy(__list1,__list2) ((void)(__list1 = __list2))
90: #endif
config.h has:
/* A replacement for va_copy, if needed. */
#define gl_va_copy(a,b) ((a) = (b))
/* Define as a macro for copying va_list variables. */
#define va_copy gl_va_copy
config.log has:
configure:6770: checking for va_copy
configure:6796: xlc -c -g conftest.c >&5
"conftest.c", line 44.35: 1506-045 (S) Undeclared identifier va_copy.
configure:6802: $? = 1
...
configure:6855: xlc -c -g conftest.c >&5
"conftest.c", line 44.1: 1506-045 (S) Undeclared identifier error.
"conftest.c", line 44.13: 1506-275 (S) Unexpected text out encountered.
configure:6861: $? = 1
Consider compiler output for the following program:
$ cat a.c
#include <stdarg.h>
va_copy(a,b)
$ xlc -E a.c
#line 62 "/usr/include/va_list.h"
typedef char *va_list;
#line 2 "a.c"
va_copy(a,b)
$ xlc -qlanglvl=extc99 -E a.c
#line 62 "/usr/include/va_list.h"
typedef char *va_list;
#line 2 "a.c"
__builtin_va_copy(a,b)
$ cat b.c
#define va_copy(a,b) (a)
#include <stdarg.h>
va_copy(a,b)
$ xlc -E b.c
"/usr/include/stdarg.h", line 89.9: 1506-236 (W) Macro name va_copy has been
redefined.
"/usr/include/stdarg.h", line 89.9: 1506-358 (I) "va_copy" is defined on line
1 of b.c.
#line 62 "/usr/include/va_list.h"
typedef char *va_list;
#line 3 "b.c"
va_copy(a,b)
So, if we #define va_copy() before <stdarg.h>, it's obvious that
<stdarg.h> is redefining it. But, to what? It looks like the only way
to get the builtin va_copy() to work on AIX 5.3 is to add
-qlanglvl=extc99 to CFLAGS?
--
albert chin ([EMAIL PROTECTED])
