Hello,
I think I have found a bug in autoconf v2.13 when combining
autoheader, AC_LANG_CPLUSPLUS and AC_C_CONST or AC_C_INLINE .
This results in inline and const being defined as an empty string.
It happens when trying to use the generated configure script with
gcc v2.95.2 .
It does not happen when AC_LANG_CPLUSPLUS is not used.
I do not know what has to happen with autoconf.m4f and autoheader.m4f, so
I am not really sure if the proposed patch is Ok.
My workaround is to copy the edited AC_C_CONST and AC_C_INLINE as
AC_CX_CONST and AC_CX_INLINE into aclocal.m4 in the project direcotry
and use these two macros instead.
Regards
Andreas
p.s. host is Ultra Sparc 1 running Solaris 2.6
excerpt from config.log:
-------------------------------------------------------------------------------
configure:1687: checking for working const
configure:1741: g++ -c -g -O2 conftest.C 1>&5
configure: In function `int main()':
configure:1697: uninitialized const `x'
configure: failed program was:
#line 1692 "configure"
#include "confdefs.h"
int main() {
/* Ultrix mips cc rejects this. */
typedef int charset[2]; const charset x;
/* SunOS 4.1.1 cc rejects this. */
char const *const *ccp;
char **p;
/* NEC SVR4.0.2 mips cc rejects this. */
struct point {int x, y;};
static struct point const zero = {0,0};
/* AIX XL C 1.02.0.0 rejects this.
It does not let you subtract one const X* pointer from another in an arm
of an if-expression whose if-part is not a constant expression */
const char *g = "string";
ccp = &g + (g ? g-g : 0);
/* HPUX 7.0 cc rejects these. */
++ccp;
p = (char**) ccp;
ccp = (char const *const *) p;
{ /* SCO 3.2v4 cc rejects this. */
char *t;
char const *s = 0 ? (char *) 0 : (char const *) 0;
*t++ = 0;
}
{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this. */
int x[] = {25, 17};
const int *foo = &x[0];
++foo;
}
{ /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
typedef const int *iptr;
iptr p = 0;
++p;
}
{ /* AIX XL C 1.02.0.0 rejects this saying
"k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
struct s { int j; const int *ap[3]; };
struct s *b; b->j = 5;
}
{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
const int foo = 10;
}
; return 0; }
configure:1762: checking for inline
configure:1776: g++ -c -g -O2 conftest.C 1>&5
configure:1772: ANSI C++ forbids declaration `foo' with no type
configure: failed program was:
#line 1769 "configure"
#include "confdefs.h"
int main() {
} inline foo() {
; return 0; }
configure:1776: g++ -c -g -O2 conftest.C 1>&5
configure:1772: ANSI C++ forbids declaration `foo' with no type
configure: failed program was:
#line 1769 "configure"
#include "confdefs.h"
int main() {
} __inline__ foo() {
; return 0; }
configure:1776: g++ -c -g -O2 conftest.C 1>&5
configure:1772: ANSI C++ forbids declaration `foo' with no type
configure: failed program was:
#line 1769 "configure"
#include "confdefs.h"
int main() {
} __inline foo() {
; return 0; }
configure:1802: checking for size_t
-------------------------------------------------------------------------------
a proposed patch:
-------------------------------------------------------------------------------
~/wk/autoconf-2.13 $ diff -c acspecific.m4.dist acspecific.m4
*** acspecific.m4.dist Tue Jan 5 14:27:52 1999
--- acspecific.m4 Tue Sep 5 15:30:44 2000
***************
*** 1885,1891 ****
[AC_CACHE_CHECK([for inline], ac_cv_c_inline,
[ac_cv_c_inline=no
for ac_kw in inline __inline__ __inline; do
! AC_TRY_COMPILE(, [} $ac_kw foo() {], [ac_cv_c_inline=$ac_kw; break])
done
])
case "$ac_cv_c_inline" in
--- 1885,1891 ----
[AC_CACHE_CHECK([for inline], ac_cv_c_inline,
[ac_cv_c_inline=no
for ac_kw in inline __inline__ __inline; do
! AC_TRY_COMPILE(, [} $ac_kw int foo() {], [ac_cv_c_inline=$ac_kw; break])
done
])
case "$ac_cv_c_inline" in
***************
*** 1903,1909 ****
changequote(<<, >>)dnl
<<
/* Ultrix mips cc rejects this. */
! typedef int charset[2]; const charset x;
/* SunOS 4.1.1 cc rejects this. */
char const *const *ccp;
char **p;
--- 1903,1909 ----
changequote(<<, >>)dnl
<<
/* Ultrix mips cc rejects this. */
! typedef int charset[2]; const charset x = { 0 };
/* SunOS 4.1.1 cc rejects this. */
char const *const *ccp;
char **p;
~/wk/autoconf-2.13 $
-------------------------------------------------------------------------------
--
Andreas Buschmann [EMAIL PROTECTED]
Advanced System Software GmbH
Vahrenwalder Strasse 205-207 tel: +49 511 37294 267
D-30165 Hannover
