Avoid attempt for runtime checks if all environments are defined

getconf has the capability to do a runtime check for environment
support in cases where there is optional support for an environment
(_POSIX_V7_ILP32_OFF32 on x86_64 for example) and this is indicated by
not defining the _POSIX_V7_ILP32_OFF32 macro, which results in getconf
doing an additional execve of _POSIX_V7_ILP32_OFF32 in the
$GETCONF_DIR.

The default bits/environments.h however does not leave any environment
macros undefined, which means that no such additional execve is
needed.  gcc trunk catches this as a build failure since it finds that
the code block inside switch(specs[i].num) is not reachable.  Avoid
this error by not bothering about the additional exec (and looking in
specific environments) when all environments are defined.

Tested on aarch64.

	* posix/getconf.c: Define ALL_ENVIRONMENTS_DEFINED if all
	environment macros are defined.
	(main): Avoid execve if ALL_ENVIRONMENTS_DEFINED is defined.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index ce5070fe39..66bb323fc7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-06-23  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+
+	* posix/getconf.c: Define ALL_ENVIRONMENTS_DEFINED if all
+	environment macros are defined.
+	(main): Avoid execve if ALL_ENVIRONMENTS_DEFINED is defined.
+
 2016-06-23  Florian Weimer  <fweimer@redhat.com>
 
 	[BZ #20191]