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Message-ID: <20190729095047.k45isr7etq3xkyvr@willie-the-truck>
Date:   Mon, 29 Jul 2019 10:50:48 +0100
From:   Will Deacon <will@...nel.org>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Subject: Re: build error

Hi Matteo,

On Sun, Jul 28, 2019 at 10:08:06PM +0200, Matteo Croce wrote:
> I get this build error with 5.3-rc2"
> 
> # make
> arch/arm64/Makefile:58: gcc not found, check CROSS_COMPILE_COMPAT.  Stop.
> 
> I didn't bisect the tree, but I guess that this kconfig can be related
> 
> # grep CROSS_COMPILE_COMPAT .config
> CONFIG_CROSS_COMPILE_COMPAT_VDSO=""
> 
> Does someone have any idea? Am I missing something?

Can you try something like the below?

Will

--->8

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index bb1f1dbb34e8..d35ca0aee295 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -52,7 +52,7 @@ ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
 
   ifeq ($(CONFIG_CC_IS_CLANG), y)
     $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
-  else ifeq ($(CROSS_COMPILE_COMPAT),)
+  else ifeq ("$(CROSS_COMPILE_COMPAT)","")
     $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
   else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
     $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)

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