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: 2016-02-27 20:52:32

#9445: context asm files fail to build for x32 ABIs
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  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:
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Comment (by 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...

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9445#comment:26>
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