Christopher Haster 3b495bab79 Fixed spurious CI failure caused by multiple writers to .o files ...

GCC is a bit frustrating here, it really wants to generate every file in
a single command, which _is_ more efficient if our build system could
leverage this. But -fcallgraph-info is a rather novel flag, so we can't
really rely on it for generally compiling and testing littlefs.

The multi-file output gets in the way when we want an explicitly
separate rule for callgraph-info generation. We can't generate the
callgraph-info without generating the objects files.

This becomes a surprsing issue when parallel building (make -j) is used!
Suddenly we might end up with both the .o and .ci rules writing to .o
files, which creates a really difficult to track down issue of corrupted
.o files.

The temporary solution is to use an order-only prerequisite. This still
ends up building the .o files twice, but it's an acceptable tradeoff for
not requiring the -fcallgraph-info for all builds.

2022-03-20 03:39:18 -05:00

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