Question about Leopard's gcc -M* compiler directive defaults (which weren't apparently present with Tiger's gcc).
Question about Leopard's gcc -M* compiler directive defaults (which weren't apparently present with Tiger's gcc).
- Subject: Question about Leopard's gcc -M* compiler directive defaults (which weren't apparently present with Tiger's gcc).
- From: Terry Simons <email@hidden>
- Date: Wed, 23 Jan 2008 00:42:43 -0700
Hi,
I have some autoconf magic that tries to set things up for universal
binary support. This code worked in Tiger, but I'm getting errors
with Leopard:
gcc-4.0: -E, -S, -save-temps and -M options are not allowed with
multiple -arch flags
Since I was not getting this error with Tiger's version of gcc 4.0, I
can only assume that this is something new to Leopard, or something
that patched my configure.ac since the last time I tried this broke
something.
For reference, here are the relevant flags being sent to the compiler:
-Wall -fno-strict-aliasing -g -O2 -isysroot /Developer/SDKs/
MacOSX10.4u.sdk -mmacosx-version-min=10.4 -arch i386 -arch ppc -MT
lldpneighbors.o -MD -MP -MF .deps/lldpneighbors.Tpo -c -o
lldpneighbors.o lldpneighbors.c
Is the generation of -M* gcc options a new default behavior in
Leopard's updated auto* tools?
I've tried deciphering the GCC documentation.
-MT and -MP make some sense to me... though I'm not sure I understand
why they would cause a problem.
-MD and -MF makes no sense to me whatsoever. :)
I'll go out on a limb here and assume that what the error really means
is that -MD is the real culprit, since it is equivalent to -M -MF,
where -M is the real problem, and that removing -MD also means that I
should probably remove -MF as well, but how do I do that?
I'd much rather forgo these options in favor of being able to build
universally.
Any Apple people lurking that might be able to shed some light? ;)
Thanks,
- Terry
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