Re: [Boost-bugs] [Boost C++ Libraries] #9445: context asm files fail to build for x32 ABIs

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9445: context asm files fail to build for x32 ABIs
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-28 12:05:53

#9445: context asm files fail to build for x32 ABIs
----------------------------------------+---------------------
  Reporter:  Mike Frysinger <vapier@…>  |      Owner:  olli
      Type:  Bugs                       |     Status:  closed
 Milestone:  To Be Determined           |  Component:  context
   Version:  Boost 1.55.0               |   Severity:  Problem
Resolution:  fixed                      |   Keywords:
----------------------------------------+---------------------

Comment (by olli):

 Replying to [comment:26 anonymous]:
 > I've tried building boost from the develop branch.  Pretty much as I
 expected:
 >
 > gcc.jam sets -m32 if a 32bit platform is detected.  This isn't
 appropriate for x32, since as I mentioned previously -m32 specifies IA32.
 -mx32 is used for x32.  Or simply no -m since it's the toolchain default.
 [Why does boost set it anyway?  Virtually every other project obeys
 whatever ABI is set by compiler/cflags, and detects the properties based
 upon the compiler output]
 >
 > boost-build adds -march=i686 to the cflags for building on 32bit x86
 platform, this is incompatible with x32 since x32 is an x86-64 variant
 ABI.  It fails with "error: CPU you selected does not support x86-64
 instruction set" [As above, why does boost set -march?  The only time a
 specific -march is necessary to allow use of flags such as -mavx is when
 that instruction set flag is not allowed for the configured -march, if
 there's no -march, the compiler produces code for the default and or
 generic configured target (x86-64 on amd64/em64t), then all -m instruction
 extension flags are allowed.]
 >
 > I'll see if I can remove the -march/ABI overrides and get it to build...

 you could try address-model=64 on b2 cmdline

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9445#comment:29>
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