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Port to compilers that moan about K&R func decls

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* lib/autoconf/c.m4 (AC_LANG_CALL, AC_LANG_FUNC_LINK_TRY):
Use '(void)' rather than '()' in function prototypes, as the latter
provokes fatal errors in some compilers nowadays.
* lib/autoconf/functions.m4 (AC_FUNC_STRTOD):
* tests/fortran.at (AC_F77_DUMMY_MAIN usage):
* tests/semantics.at (AC_CHECK_DECLS):
Don’t use () in a function decl.
This commit is contained in:
Paul Eggert 2022-09-01 16:19:50 -05:00
parent 0a647a93cb
commit 8b5e2016c7
5 changed files with 10 additions and 15 deletions
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6
doc/autoconf.texi
View File

@ -5460,9 +5460,7 @@ the @samp{#undef malloc}):
#include <config.h>
#undef malloc
#include <sys/types.h>
void *malloc ();
#include <stdlib.h>
/* Allocate an N-byte block of memory from the heap.
If N is zero, allocate a 1-byte block. */
@ -8297,7 +8295,7 @@ needed:
# ifdef __cplusplus
extern "C"
# endif
int F77_DUMMY_MAIN () @{ return 1; @}
int F77_DUMMY_MAIN (void) @{ return 1; @}
#endif
@end example

6
lib/autoconf/c.m4
View File

@ -133,7 +133,7 @@ m4_if([$2], [main], ,
#ifdef __cplusplus
extern "C"
#endif
char $2 ();])], [return $2 ();])])
char $2 (void);])], [return $2 ();])])
# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
@ -157,7 +157,7 @@ m4_define([AC_LANG_FUNC_LINK_TRY(C)],
#define $1 innocuous_$1
/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $1 (); below. */
which can conflict with char $1 (void); below. */
#include <limits.h>
#undef $1
@ -168,7 +168,7 @@ m4_define([AC_LANG_FUNC_LINK_TRY(C)],
#ifdef __cplusplus
extern "C"
#endif
char $1 ();
char $1 (void);
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */

3
lib/autoconf/functions.m4
View File

@ -1613,9 +1613,6 @@ AC_DEFUN([AC_FUNC_STRTOD],
AC_CACHE_CHECK(for working strtod, ac_cv_func_strtod,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
]AC_INCLUDES_DEFAULT[
#ifndef strtod
double strtod ();
#endif
int
main (void)
{

8
tests/fortran.at
View File

@ -233,7 +233,7 @@ void FOOBAR_F77 (double *x, double *y);
# ifdef __cplusplus
extern "C"
# endif
int F77_DUMMY_MAIN () { return 1; }
int F77_DUMMY_MAIN (void) { return 1; }
#endif
int main(int argc, char *argv[])
@ -315,7 +315,7 @@ void FOOBAR_FC(double *x, double *y);
# ifdef __cplusplus
extern "C"
# endif
int FC_DUMMY_MAIN () { return 1; }
int FC_DUMMY_MAIN (void) { return 1; }
#endif
int main (int argc, char *argv[])
@ -561,7 +561,7 @@ void @foobar@ (int *x);
# ifdef __cplusplus
extern "C"
# endif
int F77_DUMMY_MAIN () { return 1; }
int F77_DUMMY_MAIN (void) { return 1; }
#endif
int main(int argc, char *argv[])
@ -637,7 +637,7 @@ void @foobar@ (int *x);
# ifdef __cplusplus
extern "C"
# endif
int FC_DUMMY_MAIN () { return 1; }
int FC_DUMMY_MAIN (void) { return 1; }
#endif
int main(int argc, char *argv[])

2
tests/semantics.at
View File

@ -207,7 +207,7 @@ AT_CHECK_MACRO([AC_CHECK_DECLS],
[[extern int yes;
enum { myenum };
extern struct mystruct_s { int x[20]; } mystruct;
extern int myfunc();
extern int myfunc (int);
#define mymacro1(arg) arg
#define mymacro2]])
# Ensure we can detect missing declarations of functions whose