configure script may fail to build kernel module when multiple GCC versions installed

[DeHackEd]

The kernel build process uses its own $CC variable for compiling than is used by ./configure or the userspace tools builds. ./configure --help documents them as is normal for autoconf based systems. Thus users may do something like:

CC=/usr/local/gcc-6.x/bin/gcc ./configure
...
checking whether host toolchain supports AVX2... yes
...

Except the kernel module builder doesn't honour that CC variable and you'll fail to build the kernel.

Not sure if this is the user's fault, or if there's a good solution to this.

[stale]

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