[MacPorts] #63304: clang 3.4 @3.4.2_15: Build fails (incompatible cpu-subtype) on a G3

[MacPorts]

#63304: clang 3.4 @3.4.2_15: Build fails (incompatible cpu-subtype) on a G3
-------------------------+----------------------
  Reporter:  evanmiller  |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  ppc
      Port:  clang-3.4   |
-------------------------+----------------------

Comment (by evanmiller):

 Yep there's an {{{-maltivec}}} indiscriminately added in
 {{{llvm-3.4.2.src/tools/clang/lib/Lex/Makefile}}}:

 {{{
 ifeq ($(ARCH),PowerPC)
 CXX.Flags += -maltivec
 endif
 }}}

 Currently trying to build with that commented out. If it works we'll
 likely need another (or broader) discussion about how to handle it, since
 there didn't seem to be a consensus about variants vs host checking with
 regard to libjpeg-turbo.

 In the clang-3.4 case, it might be possible to pass in {{{-mno-altivec}}}
 without patching source – in my testing, this flag will override a prior
 {{{-maltivec}}} flag.

-- 
Ticket URL: <https://trac.macports.org/ticket/63304#comment:2>
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