trofi opened a new pull request #25:
URL: https://github.com/apache/apr/pull/25
The failure is observed on `autoconf-2.69d` (soon to be released
as `autoconf-2.70`). There `int64_t` detection fails as:
```
$ autoreconf && ./configure
...
checking whether int64_t and int use fmt %d... no
checking whether int64_t and long use fmt %ld... no
checking whether int64_t and long long use fmt %lld... no
configure: error: could not determine the string function for int64_t
```
This happens because `./configure` always stumbles on warning:
```
configure:3350: gcc -c -g -O2 -Werror conftest.c >&5
In file included from conftest.c:31:
confdefs.h:22: error: "__STDC_WANT_IEC_60559_ATTRIBS_EXT__" redefined
[-Werror]
22 | #define __STDC_WANT_IEC_60559_ATTRIBS_EXT__ 1
|
```
It's triggered by double inclusion of `"confdefs.h"` contents:
explicitly in `APR_TRY_COMPILE_NO_WARNING` macro and implicitly
via `AC_LANG_SOURCE` use.
To fix it and avoid having to define `main()` declaration the change
uses `AC_LANG_PROGRAM` instead.
Tested on both `autoconf-2.69` and `autoconf-2.69d`.
Bug: https://bugs.gentoo.org/738156
Bug: https://bugs.gentoo.org/750353
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