getcwd(NULL,0) fails on Solaris causing -g dwarf2 to crash

[bird-yasm@…]

getcwd(NULL, 0) is undefined behavior according to SuS. On GNU/Linux and *BSD it work like you expect, while on Solaris it will fail (because size is 0) and crash when the NULL pointer is accessed.

A quick workaround would be to pass PATH_MAX (limits.h) instead of 0 on Solaris.

[peter]

(In [2004]) Fix #118: Don't use getcwd(NULL, 0), as it's platform-specific behavior.

Instead write our own yasmgetcwd() which retries getcwd() with increasing buffer sizes until the path fits (as the initial size is 1024, in basically all cases it'll succeed on the first try).

Reported by: bird-yasm@…

[bird-yasm@…]

Tested the fix on Solaris with both 1024 and with 4 as the initial buffer size, it works like a charm. Thanks!