[Python-Dev] How to configure with icc on Mac?

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    >> ...
    >> configure:10332: checking size of size_t
    >> configure:10637: icc -o conftest -g -O2   conftest.c  >&5
    >> ld: library not found for -lgcc_s

    Martin> I think you have the source of the problem right there: your icc
    Martin> installation is broken. It is unable to build even trivial
    Martin> programs.

    Martin> To confirm this theory, take the source of the program, and
    Martin> invoke it with the very same command line. If it gives you the
    Martin> same error, then this has nothing to do with autoconf, or
    Martin> Python, or anything: that command line *must* work, or else the
    Martin> compiler is useless.

It compiled without error.  Hmmm...

I added -v to the command.  it does indeed ask for libgcc_s though it
specifies it with a version number:

    ld -lcrt1.10.5.o -dynamic -arch x86_64 -weak_reference_mismatches
    non-weak -o conftest
    /var/folders/5q/5qTPn6xq2RaWqk+1Ytw3-U+++TI/-Tmp-//iccTRv8HW.o
    -L/opt/intel/Compiler/11.0/056/lib -L/usr/lib/i686-apple-darwin9/4.0.1/
    -L/usr/lib/ -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/x86_64
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/../../../i686-apple-darwin9/4.0.1/
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/../../.. /opt/intel/Compiler/11.0/056/lib/libimf.a
    /opt/intel/Compiler/11.0/056/lib/libsvml.a
    /opt/intel/Compiler/11.0/056/lib/libipgo.a
    /opt/intel/Compiler/11.0/056/lib/libdecimal.a
    /opt/intel/Compiler/11.0/056/lib/libirc.a -lgcc_s.10.5 -lgcc
    -lSystemStubs -lmx -lSystem /opt/intel/Compiler/11.0/056/lib/libirc.a
    /opt/intel/Compiler/11.0/056/lib/libirc_s.a -ldl

This is from the same shell where the configure run failed so I'm fairly
certain it can't be related to a different set of environment variables.
The only possible environment change would seem to be something configure
imposed.  I added -v to the ac_link command to see what it was generating
for the ld command:

    ld -lcrt1.o -dynamic -arch x86_64 -weak_reference_mismatches non-weak
    -macosx_version_min 10.3 -o conftest
    /var/folders/5q/5qTPn6xq2RaWqk+1Ytw3-U+++TI/-Tmp-//iccTIMK7D.o
    -L/opt/intel/Compiler/11.0/056/lib -L/usr/lib/i686-apple-darwin9/4.0.1/
    -L/usr/lib/ -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/x86_64
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/../../../i686-apple-darwin9/4.0.1/
    -L/usr/lib/gcc/i686-apple-darwin9/4.0.1/../../.. /opt/intel/Compiler/11.0/056/lib/libimf.a
    /opt/intel/Compiler/11.0/056/lib/libsvml.a
    /opt/intel/Compiler/11.0/056/lib/libipgo.a
    /opt/intel/Compiler/11.0/056/lib/libdecimal.a
    /opt/intel/Compiler/11.0/056/lib/libirc.a -lgcc_s -lgcc -lSystemStubs
    -lmx -lSystem /opt/intel/Compiler/11.0/056/lib/libirc.a
    /opt/intel/Compiler/11.0/056/lib/libirc_s.a -ldl

I searched back through config.log looking for gcc_s.  I noticed that the
ld command used for -fno-strict-aliasing linked against -lgcc_s.10.5 but
that the check for -Olimit 1500 linked against -lgcc_s.  In between there is
this block of code:

            # Calculate the right deployment target for this build.
            #
            cur_target=`sw_vers -productVersion | sed 's/\(10\.[[0-9]]*\).*/\1/'`
            if test ${cur_target} '>' 10.2; then
                    cur_target=10.3
            fi
            if test "${UNIVERSAL_ARCHS}" = "all"; then
                    # Ensure that the default platform for a 4-way
                    # universal build is OSX 10.5, that's the first
                    # OS release where 4-way builds make sense.
                    cur_target='10.5'
            fi
            CONFIGURE_MACOSX_DEPLOYMENT_TARGET=${MACOSX_DEPLOYMENT_TARGET-${cur_target}}
            
            # Make sure that MACOSX_DEPLOYMENT_TARGET is set in the 
            # environment with a value that is the same as what we'll use
            # in the Makefile to ensure that we'll get the same compiler
            # environment during configure and build time.
            MACOSX_DEPLOYMENT_TARGET="$CONFIGURE_MACOSX_DEPLOYMENT_TARGET"
            export MACOSX_DEPLOYMENT_TARGET
            EXPORT_MACOSX_DEPLOYMENT_TARGET=''

I stuck in an echo after the export statement:

    ...
    checking whether icc accepts -fno-strict-aliasing... yes
    >>> 10.3
    checking whether icc accepts -OPT:Olimit=0... (cached) no
    ...

When I installed Xcode I didn't include the 10.3 stuff since I don't run
that version anymore, so it's quite possible I have a somehow "deficient"
Xcode install.  Still, the 10.3 stuff is not installed by default these days
so it shouldn't be required.  

This code looks suspicious:

            if test ${cur_target} '>' 10.2; then
                    cur_target=10.3
            fi

If I comment it out configure succeeds.  This code dates from r65061 which
states:

  #3381 fix framework builds on 10.4

Maybe it should be 

            if test ${cur_target} '>' 10.2 -a ${cur_target} '<' 10.5 ; then
                    cur_target=10.3
            fi

I'll open a ticket.

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