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Details: - Historically, the compiler selection has happened statically in the various make_defs.mk and would only be overriden by setting CC (either prior to running configure or as a configure argument). However, in the last couple months, configure has evolved to contain rather sophisticated compiler detection logic for the purposes of blacklisting sub-configurations. It only makes sense that configure now fully take over the responsibility of selecting a compiler from the GNU make side of the build system. Thanks to Alex Arslan for his help exposing this issue. - Substitute found_cc into CC in config.mk via configure. - Set a new variable, CC_VENDOR, in config.mk via substitution from configure, and disable the corresponding CC_VENDOR code in common.mk. - Disabled default compiler selection (usually gcc) in the sub-configs' various make_def.mk files.
For more information on sub-configurations and configuration families in BLIS, please read the ConfigurationHowTo wiki.
If you don't have time, or are impatient, take a look at the config_registry
file in the top-level directory of the BLIS distribution. It contains a
grammar-like mapping of configuration names, or families, to sub-configurations,
which may be other families. Keep in mind that the / notation:
<config>: <config>/<name>
means that the kernel set associated with <name> should be made available to
the configuration <config> if <config> is targeted at configure-time.
(Some configurations borrow kernels from other configurations, and this is how
we specify that requirement.)