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dejagnu: Disable ccache


there were always various problems with compatibility with ccache:

IMO in a summary ccache finds more a benefit of faster compilation despite the
debug info is no longer exactly the same (as without ccache).

Although for example in this case ccache helped to find a real GDB bug:

For the GDB testcases ccache has (IMO) no real performance advantage and it
just brings heisenbugs - false FAILs - from time to time:

Breakpoint 1, main () at gdb/testsuite/gdb.base/vdso-warning.c:21^M
	21        return 0;^M
	(gdb) PASS: gdb.base/vdso-warning.exp: run: startup
	Breakpoint 1, main () at gdb/testsuite/gdb.base/hbreak-unmapped.c:21^M
	21        return 0;^M
	(gdb) FAIL: gdb.base/vdso-warning.exp: run: startup

So I find most safe and easy to just disable ccache for all testsuites.

I guess this issues can be considered more general than just for the GDB
testsuite, therefore posting it for dejagnu.

diff --git a/ChangeLog b/ChangeLog
index 4880003..916fa04 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2016-09-04  Jan Kratochvil  <>
+	* runtest.exp: Set CCACHE_DISABLE, clear CCACHE_NODISABLE.
 2016-06-28  Ben Elliston  <>
 	* aclocal.m4, Regenerate with automake 1.15.
diff --git a/runtest.exp b/runtest.exp
index 2c6ca5d..0415e4e 100644
--- a/runtest.exp
+++ b/runtest.exp
@@ -87,6 +87,11 @@ set target_cpu     ""		;# type of the cpu tests are running on
 set target_alias   ""		;# standard abbreviation of target
 set compiler_flags ""		;# the flags used by the compiler
+# Various ccache versions provide incorrect debug info such as ignoring
+# different current directory, breaking GDB testsuite.
+set env(CCACHE_DISABLE) 1
+unset -nocomplain env(CCACHE_NODISABLE)
 # some convenience abbreviations

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