[Buildroot] Buildroot autobuilder: make[2]: c: Command not found

[Yann E. MORIN <yann.morin.1998@free.fr>]

Alexey, All,

On 2018-12-05 07:29 +0000, Alexey Brodkin spake thusly:
> Just got a report about failed build, see
> http://autobuild.buildroot.net/results/cb5/cb555a124bb3bdb9c5a3465673c21022d94cf2ca/
> 
> But there's definitely something strange there as instead of "gcc" command "c" gets executed,
> see http://autobuild.buildroot.net/results/cb5/cb555a124bb3bdb9c5a3465673c21022d94cf2ca//build-end.log:
> ------------------------>8-----------------------
> c -o option.o -pipe -ffunction-sections -O2 -g  -I/home/buildroot/autobuild/run/instance-0/output/build/qt5base-5.6.3/qmake
[--SNIP--]
> make[2]: c: Command not found

It furiously looks like a variable was expanded to an empty string, and
thus a command in the form of:
    $(CC) -c -o blabla

got turned into this:
    -c -o blabla

which make interprets as running the 'c' command with blabla params,
but the leading dash instructs it to ignore any failure.

I've spun a build here to investigate. If I can't reproduce lcoally, I'll
see to try and reproduce it on my autobuild instance.

Regards,
Yann E. MORIN.

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