Hi, On 2023-09-23, Detlef Riekenberg <wine.dev@xxxxxx> wrote: > During testing of tcc 0.9.28rc, > I found a strange bug in autoconf 2.71 with `AC_CHECK_DEFINE` for > `__unix__`. The word AC_CHECK_DEFINE is not found anywhere in the Autoconf source code or documentation. So I am afraid it is a bit difficult to understand this report. [snip] > Please test this snipped with the current 2.72rc: > ``` > AC_CHECK_DEFINE(__unix, CFLAGS="-DFOUND__unix $CFLAGS") > AC_CHECK_DEFINE(__unix__, CFLAGS="-DFOUND__unix__ $CFLAGS") > AC_CHECK_DEFINE(__linux__, CFLAGS="-DFOUND__linux__ $CFLAGS") As expected, if I translate this into an "obvious" configure.ac by adding the mandatory AC_INIT and AC_OUTPUT expansions, I just get: configure.ac:3: error: possibly undefined macro: AC_CHECK_DEFINE [...] So it sounds lkie there must be some third party code involved which is defining this macro (and this code is defining macros in the AC_* namespace to make it look like it came from Autoconf when in fact it did not). That doesn't mean there isn't a bug in Autoconf. It would be helpful if you could produce a complete self-contained test case which demonstrates the problem, one that doesn't depend on code from outside of Autoconf which we don't necessarily have. Cheers, Nick
