[cmake-developers] [CMake 0011627]: Wrong target-architecture flags for stock version of gfortran on OS X

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=11627 
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Reported By:                Christian Convey
Assigned To:                
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Project:                    CMake
Issue ID:                   11627
Category:                   CMake
Reproducibility:            always
Severity:                   block
Priority:                   high
Status:                     new
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Date Submitted:             2010-12-18 10:57 EST
Last Modified:              2010-12-18 10:57 EST
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Summary:                    Wrong target-architecture flags for stock version of
gfortran on OS X
Description: 
I set CMAKE_OSX_ARCHITECTURES to "x86_64", because I want to produce a 64-bit
executable.

When I do this, gfortran ends up being invoked with "-arch x86_64", which isn't
valid for the compiler.  

There are some OS X fortran compilers for which "-arch" *is* appropriate. 
Apparently Apple used to maintain a port of gfortran for which that flag was
valid, but they seem to not do that any longer.  "-arch" is also valid for the
Intel fortran compiler on OS X.

The problem is that the stock GCC fortran compiler does not support "-arch".

Here's what a gfortran developer told me: "The GCC option for specifying an
architecture is of the form '-march=XYZ' where you can a complete list of XYZ in
the GCC manual.  http://gcc.gnu.org/onlinedocs/gcc-4.5.1/gcc/ "
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Issue History 
Date Modified    Username       Field                    Change               
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2010-12-18 10:57 Christian ConveyNew Issue                                    
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