The GNUmakefile currently performs the following:
IS_X86 = $(shell uname -m | $(EGREP) -c "i.86|x86|i86|amd64")
IS_X86_64 = $(shell uname -m | $(EGREP) -c "_64|d64")
That actually tests the architecture of the host computer (where we are
compiling), and not the target (what we are building for).
I'd like to change that to use the preprocessor:
# Through compiler driver
IS_X86 = $(shell $(CXX) -dm -E - < /dev/null | $(EGREP) -c
"i.86|x86|i86|amd64")
or:
# Query preprocessor directly
IS_X86 = $(shell $(CPP) -dm < /dev/null | $(EGREP) -c
"i.86|x86|i86|amd64")
The reason I ask is I have two new architectures to test on, and neither is
cross-compiled. One is ARM and the other is PowerPC. I can add the
detection routines through uname (presumably), or I can ask the
preprocessor by looking for defines like __i368__, __x86_64__ and __arm__,
which is definitive.
I think the change is safe for most commodity gear, like Linux and the
BSDs. But I am not sure about lesser tested system, like Solaris.
Does anyone see any problems with the change?
Jeff
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