[PATCH 2/9] utils.c: pathconf call, check for _PC_PATH_MAX instead of HAVE_UNISTD_H.

Pedro Alves
2013-06-27T18:52:18Z

This check in utils.c for HAVE_UNISTD_H is being used as proxy for
"HAVE_PATHCONF", as pathconf is supposed to be declared in unistd.h.

It's possible that there are systems out there that have realpath,
unistd.h and alloca, but not pathconf+_PC_PATH_MAX. I don't know of
any by heart, but if we import gnulib's unistd module (which a
following patch will do), then unistd.h ends up always available, so
the check ends up incorrect. As pathconf is being called with
_PC_PATH_MAX, check for that instead.

gdb/
2013-06-27 Pedro Alves <palves@redhat.com>

* utils.c <pathconf/_PC_PATH_MAX use>: Check if _PC_PATH_MAX is
defined instead of checking HAVE_UNISTD_H.
---
gdb/utils.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/utils.c b/gdb/utils.c
index f5c1339..a2015a8 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -3179,7 +3179,7 @@ gdb_realpath (const char *filename)
pathconf()) making it impossible to pass a correctly sized buffer
to realpath() (it could always overflow). On those systems, we
skip this. */
-#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H) && defined(HAVE_ALLOCA)
+#if defined (HAVE_REALPATH) && defined (_PC_PATH_MAX) && defined(HAVE_ALLOCA)
{
/* Find out the max path size. */
long path_max = pathconf ("/", _PC_PATH_MAX);