[Buildroot] [Bug 11036] C compiler cannot create executables

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11036

--- Comment #4 from Arnout Vandecappelle <arnout at mind.be> ---
I suspect the problem must be in the external. The key is that config.log
contains:

CFLAGS='-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os 
-c -Wall -O2 -c -Wall -O2'

The -Os is from TARGET_OPTIMIZATION, then there is an empty TARGET_DEBUGGING,
but the "-c -Wall -O2 -c -Wall -O2" is what causes the problem. Indeed, because
of the -c, a conftest.o is generated while configure checks for a.out and
conftest.exe etc.

So Bert, please check why TARGET_CFLAGS is modified (and if this is indeed the
issue).

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