From: Petr Vorel <[email protected]>
Implicit ‘int’ (e.g. ‘extern foo();’ meaning the same thing as
‘extern int foo();’) was dropped from the C standard in its 1999
edition. Twenty-five years later, free C compilers are finally
starting to make this an error by default, so let’s not use it
anymore in config.guess probe programs.
(Note: As of this writing, GCC 14 and Clang 16 are both more lenient
for ‘main() { … }’ specifically than for other uses of implicit int.
Still, the writing is clearly on the wall.)
We continue to use ‘int main() { … }’, instead of ‘int main(void) { … }’,
because these programs may be compiled by truly ancient compilers that
do not recognize the keyword ‘void’. This leaves open the possibility
of a compiler that errors by default on an empty argument list in a
function definition, which, prior to the 2024 C standard, is technically
still an “old-style” function definition; but we can worry about that
if and when it comes up.
Signed-off-by: Petr Vorel <[email protected]>
Co-authored-by: Zack Weinberg <[email protected]>
---
config.guess | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/config.guess b/config.guess
index f6d217a..b7f5e24 100755
--- a/config.guess
+++ b/config.guess
@@ -4,7 +4,7 @@
# shellcheck disable=SC2006,SC2268 # see below for rationale
-timestamp='2024-01-01'
+timestamp='2024-04-03'
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
@@ -634,7 +634,8 @@ EOF
sed 's/^ //' << EOF > "$dummy.c"
#include <sys/systemcfg.h>
- main()
+ int
+ main ()
{
if (!__power_pc())
exit(1);
@@ -718,7 +719,8 @@ EOF
#include <stdlib.h>
#include <unistd.h>
- int main ()
+ int
+ main ()
{
#if defined(_SC_KERNEL_BITS)
long bits = sysconf(_SC_KERNEL_BITS);
@@ -1621,6 +1623,7 @@ cat > "$dummy.c" <<EOF
#endif
#endif
#endif
+int
main ()
{
#if defined (sony)
--
2.43.2
