Author: bdrewery
Date: Tue Dec  8 20:20:40 2015
New Revision: 292002
URL: https://svnweb.freebsd.org/changeset/base/292002

Log:
  CCACHE_BUILD: Only export CCACHE_PATH= if it was already set with a value.
  
  Older ccache don't work with an empty CCACHE_PATH value.  They will error 
with:
    ccache: FATAL: Could not find compiler "cc" in PATH
    make: "/mnt/bdrewery/git/onefs/src/share/mk/bsd.compiler.mk" line 134: 
Unable to determine compiler type for /usr/local/bin/ccache cc.  Consider 
setting COMPILER_TYPE.
  
  Sponsored by: EMC / Isilon Storage Division

Modified:
  head/share/mk/bsd.compiler.mk

Modified: head/share/mk/bsd.compiler.mk
==============================================================================
--- head/share/mk/bsd.compiler.mk       Tue Dec  8 20:05:27 2015        
(r292001)
+++ head/share/mk/bsd.compiler.mk       Tue Dec  8 20:20:40 2015        
(r292002)
@@ -64,8 +64,10 @@ CCACHE_COMPILERCHECK?=       mtime
 # Remove ccache from the PATH to prevent double calls and wasted CPP/LD time.
 PATH:= ${PATH:C,:?${CCACHE_WRAPPER_PATH}(/world)?(:$)?,,g}
 # Ensure no bogus CCACHE_PATH leaks in which might avoid the in-tree compiler.
+.if !empty(CCACHE_PATH)
 CCACHE_PATH=
 .export CCACHE_PATH
+.endif
 # Override various toolchain vars.
 .for var in CC CXX HOST_CC HOST_CXX
 .if defined(${var}) && ${${var}:M${CCACHE_BIN}} == ""
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