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    <div class="moz-cite-prefix">On 11/10/2019 15:34 PM, Chris Jones
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:ccbdf59f-c554-3d86-75a2-ea7aa3d0dc19@hep.phy.cam.ac.uk">Hi,
      <br>
      <br>
      Are you *really* sure you rebuilt *all* your ports natively for
      Darwin19 (macOS10.15) ? Your output suggests not, i.e. from the
      first part
      <br>
      <br>
      > Driving: gfortran test.f90 -v -mmacosx-version-min=10.15.0
      <br>
      > -asm_macosx_version_min=10.15 -l gfortran -shared-libgcc
      <br>
      > Using built-in specs.
      <br>
      > COLLECT_GCC=gfortran
      <br>
      >
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/lto-wrapper<br>
      > Target: x86_64-apple-darwin18
      <br>
      <br>
      See Darwin 18 there. That is wrong, it should be 19, as in my
      output
      <br>
      <br>
      Oberon ~/cernbox/MacPorts > gfortran-mp-9 -v test.f90
      <br>
      Driving: gfortran-mp-9 -v test.f90 -mmacosx-version-min=10.15.0
      -asm_macosx_version_min=10.15 -l gfortran -shared-libgcc
      <br>
      Using built-in specs.
      <br>
      COLLECT_GCC=gfortran-mp-9
      <br>
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin19/9.2.0/lto-wrapper
      <br>
      Target: x86_64-apple-darwin19
      <br>
      <br>
      <br>
      I suspect you are using a gcc build (and probably others as well)
      that where built for macOS10.14, not macOS10.15.
      <br>
      <br>
      Following the migration guide exactly is not optional I am
      afraid....
      <br>
    </blockquote>
    <p><br>
    </p>
    <p>This is what I did supposingly but with xcode11.0... but anyway,
      I will try again with the new xcode.</p>
    <p>I will maintain you informed... it happened to other people in
      the office so if I solve this many people will be happy ;o)<br>
    </p>
    <p>Thanks a lot,</p>
    <p>g.<br>
    </p>
    <blockquote type="cite"
      cite="mid:ccbdf59f-c554-3d86-75a2-ea7aa3d0dc19@hep.phy.cam.ac.uk">
      <br>
      cheers Chris
      <br>
      <br>
      On 11/10/2019 1:41 pm, Guillaume Houzeaux @ BSC wrote:
      <br>
      <blockquote type="cite">Chris, thanks a lot for your very quick
        answer!
        <br>
        <br>
        1. I followed the path for migration and reinstalled all
        packages. I will try to do it once more to be sure.
        <br>
        2. Xcode version: 11.0
        <br>
        3. My test program is minimum:
        <br>
        <br>
        program test
        <br>
           print*,'a'
        <br>
        end program test
        <br>
        <br>
        4. The output with -v option is:
        <br>
        <br>
        Driving: gfortran test.f90 -v -mmacosx-version-min=10.15.0
        -asm_macosx_version_min=10.15 -l gfortran -shared-libgcc
        <br>
        Using built-in specs.
        <br>
        COLLECT_GCC=gfortran
        <br>
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/lto-wrapper
        <br>
        Target: x86_64-apple-darwin18
        <br>
        Configured with:
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_gcc9/gcc9/work/gcc-9.2.0/configure
        --prefix=/opt/local --build=x86_64-apple-darwin18
        --enable-languages=c,c++,objc,obj-c++,lto,fortran
        --libdir=/opt/local/lib/gcc9
        --includedir=/opt/local/include/gcc9
        --infodir=/opt/local/share/info --mandir=/opt/local/share/man
        --datarootdir=/opt/local/share/gcc-9
        --with-local-prefix=/opt/local --with-system-zlib --disable-nls
        --program-suffix=-mp-9
        --with-gxx-include-dir=/opt/local/include/gcc9/c++/
        --with-gmp=/opt/local --with-mpfr=/opt/local
        --with-mpc=/opt/local --with-isl=/opt/local
        --enable-stage1-checking --disable-multilib --enable-lto
        --enable-libstdcxx-time --with-build-config=bootstrap-debug
        --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld
        --with-ar=/opt/local/bin/ar
        --with-bugurl=<a class="moz-txt-link-freetext" href="https://trac.macports.org/newticket">https://trac.macports.org/newticket</a> --disable-tls
        --with-pkgversion='MacPorts gcc9 9.2.0_0'
--with-sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk<br>
        Thread model: posix
        <br>
        gcc version 9.2.0 (MacPorts gcc9 9.2.0_0)
        <br>
        COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=10.15.0'
        '-asm_macosx_version_min=10.15' '-shared-libgcc' '-mtune=core2'
        <br>
          /opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/f951
        test.f90 -fPIC -quiet -dumpbase test.f90
        -mmacosx-version-min=10.15.0 -mtune=core2 -auxbase test -version
        -fintrinsic-modules-path
        /opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/finclude -o
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//ccZubFPj.s
        <br>
        GNU Fortran (MacPorts gcc9 9.2.0_0) version 9.2.0
        (x86_64-apple-darwin18)
        <br>
             compiled by GNU C version 9.2.0, GMP version 6.1.2, MPFR
        version 4.0.2, MPC version 1.1.0, isl version isl-0.21-GMP
        <br>
        <br>
        GGC heuristics: --param ggc-min-expand=100 --param
        ggc-min-heapsize=131072
        <br>
        GNU Fortran2008 (MacPorts gcc9 9.2.0_0) version 9.2.0
        (x86_64-apple-darwin18)
        <br>
             compiled by GNU C version 9.2.0, GMP version 6.1.2, MPFR
        version 4.0.2, MPC version 1.1.0, isl version isl-0.21-GMP
        <br>
        <br>
        GGC heuristics: --param ggc-min-expand=100 --param
        ggc-min-heapsize=131072
        <br>
        COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=10.15.0'
        '-shared-libgcc' '-mtune=core2'
        <br>
          /opt/local/bin/as -arch x86_64 -v -force_cpusubtype_ALL
        -mmacosx-version-min=10.15 -o
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//cce0rRJI.o
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//ccZubFPj.s
        <br>
        Apple clang version 11.0.0 (clang-1100.0.33.8)
        <br>
        Target: x86_64-apple-darwin19.0.0
        <br>
        Thread model: posix
        <br>
        InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin<br>
  "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
        -cc1as -triple x86_64-apple-macosx10.15.0 -filetype obj
        -main-file-name ccZubFPj.s -target-cpu penryn
        -fdebug-compilation-dir /Users/houzeaux/Desktop
        -dwarf-debug-producer Apple clang version 11.0.0
        (clang-1100.0.33.8) -dwarf-version=4 -mrelocation-model pic -o
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//cce0rRJI.o
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//ccZubFPj.s
        <br>
        Reading specs from
/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/../../../libgfortran.spec<br>
        rename spec lib to liborig
        <br>
        COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=10.15.0'
        '-shared-libgcc' '-mtune=core2'
        <br>
COMPILER_PATH=/opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/:/opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/:/opt/local/libexec/gcc/x86_64-apple-darwin18/:/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/:/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/
        <br>
LIBRARY_PATH=/usr/lib/:/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/:/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/../../../
        <br>
        COLLECT_GCC_OPTIONS='-v' '-mmacosx-version-min=10.15.0'
        '-shared-libgcc' '-mtune=core2'
        <br>
          /opt/local/libexec/gcc/x86_64-apple-darwin18/9.2.0/collect2
        -syslibroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/
        -dynamic -arch x86_64 -macosx_version_min 10.15.0
        -weak_reference_mismatches non-weak -o a.out
        -L/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0
        -L/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/../../..
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//cce0rRJI.o
        -lgfortran -no_compact_unwind -lSystem -lgcc_ext.10.5 -lgcc
        -lquadmath -lm -lgcc_ext.10.5 -lgcc -lSystem -v
        <br>
        collect2 version 9.2.0
        <br>
        /opt/local/bin/ld -syslibroot
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/
        -dynamic -arch x86_64 -macosx_version_min 10.15.0
        -weak_reference_mismatches non-weak -o a.out
        -L/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0
        -L/opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0/../../..
        /var/folders/1z/j0r1q88d2_95cj4fd50r39mr0000gr/T//cce0rRJI.o
        -lgfortran -no_compact_unwind -lSystem -lgcc_ext.10.5 -lgcc
        -lquadmath -lm -lgcc_ext.10.5 -lgcc -lSystem -v
        <br>
        @(#)PROGRAM:ld  PROJECT:ld64-512.4
        <br>
        BUILD 05:06:53 Aug 16 2019
        <br>
        configured to support archs: armv6 armv7 armv7s arm64 arm64e
        arm64_32 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em
        <br>
        Library search paths:
        <br>
             /opt/local/lib/gcc9/gcc/x86_64-apple-darwin18/9.2.0
        <br>
             /opt/local/lib/gcc9
        <br>
        Framework search paths:
        <br>
        ld: library not found for -lSystem
        <br>
        collect2: error: ld returned 1 exit status
        <br>
        <br>
        <br>
        <blockquote type="cite">
          <br>
          one more request.
          <br>
          <br>
          please post the full output from compiling your test code with
          the -v option.
          <br>
          <br>
          cheers Chris
          <br>
          <br>
          On 11/10/2019 12:59 pm, Chris Jones wrote:
          <br>
          <blockquote type="cite">
            <br>
            can you please direct us to the exact test application code
            you are using ?
            <br>
            <br>
            Also, can you confirm the exact Xcode version you are using
            ?
            <br>
            <br>
            Have you correctly followed the macports migration guide
            after updating your OS ?
            <br>
            <br>
            <a class="moz-txt-link-freetext" href="https://trac.macports.org/wiki/Migration">https://trac.macports.org/wiki/Migration</a>
            <br>
            <br>
            cheers Chris
            <br>
            <br>
            On 11/10/2019 12:55 pm, Guillaume Houzeaux @ BSC wrote:
            <br>
            <blockquote type="cite">Hello,
              <br>
              <br>
              I'm compiling with gfortran9 on catalina and get this
              error:
              <br>
              <br>
              gfortran test.f90
              <br>
              ld: library not found for -lSystem
              <br>
              collect2: error: ld returned 1 exit status
              <br>
              <br>
              Seems that it does not find the library libSystem. I
              changed all the library paths in my bash_profile
              <br>
              <br>
              to include /usr/lib but does not work. The only solution
              for the moment is to compile with
              <br>
              <br>
              gfortran test.f90-L/usr/lib
              <br>
              <br>
              but this is not a practical option... Any idea on how to
              fix this?
              <br>
              <br>
              Thanks in advance
              <br>
              <br>
              -- <br>
              Guillaume Houzeaux
              <br>
              Team Leader
              <br>
              Dpt. Computer Applications in Science and Engineering
              <br>
              Barcelona Supercomputing Center (BSC-CNS)
              <br>
              Edificio NEXUS II - Office 3A, c) Jordi Girona 29
              <br>
              08034 Barcelona, Spain
              <br>
              <br>
              Location:
<a class="moz-txt-link-rfc2396E" href="https://www.google.es/maps/place/Carrer+de+Jordi+Girona,+08034+Barcelona/@41.3881175,2.1132195,17z/data=!3m1!4b1!4m8!1m2!10m1!1e2!3m4!1s0x12a4985099390467:0xd9abcf1987739b3e!8m2!3d41.3881175!4d2.1154135?hl=en"><https://www.google.es/maps/place/Carrer+de+Jordi+Girona,+08034+Barcelona/@41.3881175,2.1132195,17z/data=!3m1!4b1!4m8!1m2!10m1!1e2!3m4!1s0x12a4985099390467:0xd9abcf1987739b3e!8m2!3d41.3881175!4d2.1154135?hl=en></a>
              <br>
              Tel: +34 93 413 7781
              <br>
              Skype user: guillaume_houzeaux_bsc
              <br>
              WWW: BSC profile
              <a class="moz-txt-link-rfc2396E" href="https://www.bsc.es/houzeaux-guillaume"><https://www.bsc.es/houzeaux-guillaume></a>
              <br>
              ResearcherID: D-4950-2012
              <br>
              Scientific Profile:
              <a class="moz-txt-link-rfc2396E" href="https://www.researchgate.net/profile/Guillaume_Houzeaux"><https://www.researchgate.net/profile/Guillaume_Houzeaux></a>
<a class="moz-txt-link-rfc2396E" href="http://scholar.google.es/citations?user=cL9khdYAAAAJ&hl=en"><http://scholar.google.es/citations?user=cL9khdYAAAAJ&hl=en></a>
              <a class="moz-txt-link-rfc2396E" href="http://orcid.org/0000-0002-2592-1426"><http://orcid.org/0000-0002-2592-1426></a>
              <a class="moz-txt-link-rfc2396E" href="http://www.researcherid.com/rid/D-4950-2012"><http://www.researcherid.com/rid/D-4950-2012></a>
              <br>
              <br>
            </blockquote>
          </blockquote>
        </blockquote>
        <br>
        -- <br>
        Guillaume Houzeaux
        <br>
        Team Leader
        <br>
        Dpt. Computer Applications in Science and Engineering
        <br>
        Barcelona Supercomputing Center (BSC-CNS)
        <br>
        Edificio NEXUS II - Office 3A, c) Jordi Girona 29
        <br>
        08034 Barcelona, Spain
        <br>
        <br>
        Location:
<a class="moz-txt-link-rfc2396E" href="https://www.google.es/maps/place/Carrer+de+Jordi+Girona,+08034+Barcelona/@41.3881175,2.1132195,17z/data=!3m1!4b1!4m8!1m2!10m1!1e2!3m4!1s0x12a4985099390467:0xd9abcf1987739b3e!8m2!3d41.3881175!4d2.1154135?hl=en"><https://www.google.es/maps/place/Carrer+de+Jordi+Girona,+08034+Barcelona/@41.3881175,2.1132195,17z/data=!3m1!4b1!4m8!1m2!10m1!1e2!3m4!1s0x12a4985099390467:0xd9abcf1987739b3e!8m2!3d41.3881175!4d2.1154135?hl=en></a>
        <br>
        Tel: +34 93 413 7781
        <br>
        Skype user: guillaume_houzeaux_bsc
        <br>
        WWW: BSC profile <a class="moz-txt-link-rfc2396E" href="https://www.bsc.es/houzeaux-guillaume"><https://www.bsc.es/houzeaux-guillaume></a>
        <br>
        ResearcherID: D-4950-2012
        <br>
        Scientific Profile:
        <a class="moz-txt-link-rfc2396E" href="https://www.researchgate.net/profile/Guillaume_Houzeaux"><https://www.researchgate.net/profile/Guillaume_Houzeaux></a>
<a class="moz-txt-link-rfc2396E" href="http://scholar.google.es/citations?user=cL9khdYAAAAJ&hl=en"><http://scholar.google.es/citations?user=cL9khdYAAAAJ&hl=en></a>
        <a class="moz-txt-link-rfc2396E" href="http://orcid.org/0000-0002-2592-1426"><http://orcid.org/0000-0002-2592-1426></a>
        <a class="moz-txt-link-rfc2396E" href="http://www.researcherid.com/rid/D-4950-2012"><http://www.researcherid.com/rid/D-4950-2012></a>
        <br>
        <br>
      </blockquote>
    </blockquote>
    <p><br>
    </p>
    <div class="moz-signature">-- <br>
      <font size="4" face="Garamond, Times">
        Guillaume Houzeaux<br>
        Team Leader<br>
        Dpt. Computer Applications in Science and Engineering<br>
        Barcelona Supercomputing Center (BSC-CNS)<br>
        Edificio NEXUS II - Office 3A, c) Jordi Girona 29<br>
        08034 Barcelona, Spain<br>
        <br>
        Location: <a
href="https://www.google.es/maps/place/Carrer+de+Jordi+Girona,+08034+Barcelona/@41.3881175,2.1132195,17z/data=!3m1!4b1!4m8!1m2!10m1!1e2!3m4!1s0x12a4985099390467:0xd9abcf1987739b3e!8m2!3d41.3881175!4d2.1154135?hl=en"><img
            src="cid:part1.E2B13A82.42F5E6C1@bsc.es" height="15"></a> <br>
        Tel: +34 93 413 7781<br>
        Skype user: guillaume_houzeaux_bsc<br>
        WWW: <a href="https://www.bsc.es/houzeaux-guillaume">BSC
          profile</a> <br>
        ResearcherID: D-4950-2012 <br>
        Scientific Profile: <a
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          href="http://orcid.org/0000-0002-2592-1426"><img
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--->
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      <p>
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