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build: fix -Wstrict-prototypes (Clang 16)

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Clang 16 warns on -Wstrict-prototypes in preparation for C23 which can
among other things, lead to some configure tests silently failing/returning the wrong result.

Fixes this error:
```
-ignoreme: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
+ignoreme: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
 main ()
```

For more information, see LWN.net [0] or LLVM's Discourse [1], gentoo-dev@ [2],
or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/
[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
[2] https://archives.gentoo.org/gentoo-dev/message/dd9f2d3082b8b6f8dfbccb0639e6e240
[3] hosted at lists.linux.dev.

Bug: https://bugs.gentoo.org/879747
Signed-off-by: Sam James <sam@gentoo.org>
---
This commit is contained in:
Sam James 2022-11-08 06:42:59 +00:00 committed by David Goulet
parent 7a851e8983
commit ee38514cc4
1 changed files with 5 additions and 5 deletions
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10
configure.ac
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@ -1982,7 +1982,7 @@ AC_CACHE_CHECK([whether memset(0) sets pointers to NULL], tor_cv_null_is_zero,
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
int main () { char *p1,*p2; p1=NULL; memset(&p2,0,sizeof(p2));
int main (void) { char *p1,*p2; p1=NULL; memset(&p2,0,sizeof(p2));
return memcmp(&p1,&p2,sizeof(char*))?1:0; }]])],
[tor_cv_null_is_zero=yes],
[tor_cv_null_is_zero=no],
@ -2006,7 +2006,7 @@ AC_CACHE_CHECK([whether memset(0) sets doubles to 0.0], tor_cv_dbl0_is_zero,
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
int main () { double d1,d2; d1=0; memset(&d2,0,sizeof(d2));
int main (void) { double d1,d2; d1=0; memset(&d2,0,sizeof(d2));
return memcmp(&d1,&d2,sizeof(d1))?1:0; }]])],
[tor_cv_dbl0_is_zero=yes],
[tor_cv_dbl0_is_zero=no],
@ -2031,7 +2031,7 @@ AC_CACHE_CHECK([whether we can malloc(0) safely.], tor_cv_malloc_zero_works,
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
int main () { return malloc(0)?0:1; }]])],
int main (void) { return malloc(0)?0:1; }]])],
[tor_cv_malloc_zero_works=yes],
[tor_cv_malloc_zero_works=no],
[tor_cv_malloc_zero_works=cross])])
@ -2049,7 +2049,7 @@ fi
# whether we seem to be in a 2s-complement world.
AC_CACHE_CHECK([whether we are using 2s-complement arithmetic], tor_cv_twos_complement,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[int main () { int problem = ((-99) != (~99)+1);
[[int main (void) { int problem = ((-99) != (~99)+1);
return problem ? 1 : 0; }]])],
[tor_cv_twos_complement=yes],
[tor_cv_twos_complement=no],
@ -2069,7 +2069,7 @@ fi
# What does shifting a negative value do?
AC_CACHE_CHECK([whether right-shift on negative values does sign-extension], tor_cv_sign_extend,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[int main () { int okay = (-60 >> 8) == -1; return okay ? 0 : 1; }]])],
[[int main (void) { int okay = (-60 >> 8) == -1; return okay ? 0 : 1; }]])],
[tor_cv_sign_extend=yes],
[tor_cv_sign_extend=no],
[tor_cv_sign_extend=cross])])