[OE-core] [PATCH] apr: remove conflict with ccache

[Dmitry Eremin-Solenikov]

If ccache is enabled, compiling apr-utils fails with the following error
messages because libtool is confused by the "ccache gcc" appearing on
the command line. Disable ccache for apr, so that ccache don't get
enabled in all software using apr's rules.mk.

The error message from apr-utils-native:

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov at gmail.com>
---
 meta/recipes-support/apr/apr_1.5.2.bb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/meta/recipes-support/apr/apr_1.5.2.bb b/meta/recipes-support/apr/apr_1.5.2.bb
index e12a176..1c61e84 100644
--- a/meta/recipes-support/apr/apr_1.5.2.bb
+++ b/meta/recipes-support/apr/apr_1.5.2.bb
@@ -32,6 +32,11 @@ CACHED_CONFIGUREVARS += "apr_cv_mutex_recursive=yes"
 #
 CACHED_CONFIGUREVARS += "ac_cv_header_netinet_sctp_h=no ac_cv_header_netinet_sctp_uio_h=no"
 
+# Otherwise libtool fails to compile apr-utils
+# x86_64-linux-libtool: compile: unable to infer tagged configuration
+# x86_64-linux-libtool:   error: specify a tag with '--tag'
+CCACHE = ""
+
 do_configure_prepend() {
 	# Avoid absolute paths for grep since it causes failures
 	# when using sstate between different hosts with different
-- 
2.6.1