[Buildroot] [PATCH 1/1] Makefile: set HOST*_NOCCACHE variables only if unset

Set HOSTCC_NOCCACHE and HOSTCXX_NOCCACHE only if they are not set. This
allows recursive calls to "make" to work as intended in the presence of
ccache.

Without guarding these variables, a recursive invocation of make would
re-define
    HOSTCC_NOCCACHE := $(HOSTCC)
and
    HOSTCXX_NOCCACHE := $(HOSTCXX)
at a point in time when HOSTCC and HOSTCXX already point to ccache.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
---
 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index d248bd76b2..71c0577030 100644
--- a/Makefile
+++ b/Makefile

@@ -286,12 +286,16 @@ ifndef HOSTCC
 HOSTCC := gcc
 HOSTCC := $(shell command -v $(HOSTCC) || type -p $(HOSTCC) || echo gcc)
 endif
+ifndef HOSTCC_NOCCACHE
 HOSTCC_NOCCACHE := $(HOSTCC)
+endif
 ifndef HOSTCXX
 HOSTCXX := g++
 HOSTCXX := $(shell command -v $(HOSTCXX) || type -p $(HOSTCXX) || echo g++)
 endif
+ifndef HOSTCXX_NOCCACHE
 HOSTCXX_NOCCACHE := $(HOSTCXX)
+endif
 ifndef HOSTCPP
 HOSTCPP := cpp
 endif

-- 
2.25.1

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