<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/100403>100403</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Linker missing `_FortranACopyInAssign`
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          tukss
      </td>
    </tr>
</table>

<pre>
    Compiling this simple reproducer code (the real example called `DGEMM`) produces an undefined reference to `_FortranACopyInAssign`. I'm using `flang-new` from the current `main` branch.

```fortran
program atest
  implicit none

 real(8) :: a(2)

  call ar(a)

contains

  subroutine br(x)
    implicit none
    real(8) :: x(*)
  end subroutine br
 
  subroutine ar(d)
    implicit none
    real(8) :: d(:)
 call br(d)
    
  end subroutine ar
end program atest
```

This is the error message:
```
% flang-new atest.f08 -o atest -v (1)
flang-new version 20.0.0git (https://github.com/llvm/llvm-project.git 37123e9915407d266074aaf81c5de9399b672e53)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/14
Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/14
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version 12.5
 "/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/bin/flang-new" -fc1 -triple x86_64-unknown-linux-gnu -emit-obj -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -pic-is-pie -target-cpu x86-64 -resource-dir /home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/lib/clang/20 -mframe-pointer=all -o /tmp/atest-ba7628.o -x f95-cpp-input atest.f08
 "/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/bin/ld" --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -pie -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o atest /usr/lib/gcc/x86_64-redhat-linux/14/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-redhat-linux/14/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/14/crtbeginS.o -L/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/bin/../lib/x86_64-unknown-linux-gnu -L/usr/lib/gcc/x86_64-redhat-linux/14 -L/usr/lib/gcc/x86_64-redhat-linux/14/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/lib -L/usr/lib /tmp/atest-ba7628.o -L/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/lib -lFortranRuntime -lFortranDecimal -lm -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-redhat-linux/14/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/14/../../../../lib64/crtn.o
/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/bin/ld: /tmp/atest-ba7628.o: in function `_QFPar':
FIRModule:(.text+0x115): undefined reference to `_FortranACopyInAssign'
flang-new: error: linker command failed with exit code 1 (use -v to see invocation)
```

I think the reason is that the `-L/usr/lib` option is passed to `ld` before `-L/home/user/local/._llvm/l5duc52wf5stt5l5n6whwfzlfnd2ggl2/lib` so the linker is picking up the `libFortranRuntime` from my system (having LLMV 18.1.6 installed) instead of the one installed by LLVM from git in my home directory. Should the order of the `-L` options be changed here?
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy0V0tv4zgS_jX0pUCBph62Dz6kk9UgQALsTmbnGlBkyeKEIgWSSpz99QtKfqQz7sam4QUCxSLr8bGqWPpKhKB3FnFLym-kvFuIMXbOb-P4EsKicep9e-v6QRttdxA7HSDofjAIHgfv1CjRg3QKgfB17NKyMIB7MclIYQwqIBW7--0fj4-kYoRv4KAXQFgYrcJWW1TgsUWPViJElzSea-ejF_bm1g3v9_ZmgkkqlsE94asexpAQkYq1RtgdtfhGKgatdz0kHHL0Hm1MAr3QSREaL6zsMsLuCLs5PCs2_7Wzs3l18G7nRQ8iYojzEkA6tZY6gnUWP9qYjkz4ep3ORvIbkt-AIHzNCd98JzeFA4QnfC0-7Ulno9A2fC8fxsa7MWqL0CSt_UkL4CKgtHwBzZ7wNeE3H7TRqk_W540Lnie86hc9q-Q5_-B5CkHzd5M_ACYOwNLyhayc0vcxbn-kItVhqgL03nnoMQSxwwTkohov4VREs_msZWugbn4B-pqqe3kCfBZ-RR-0s8BZxjK20zEJdjEOYTp1TXi907Ebm0y6nvDamNfjPzp49xfKmCWtfLXkOW42y7JgK8Wriq0KIdr1UpYKN_lm01QrjmV-gvCH8DuMU3LX1XNV0NG-WPdmqdF23NOdHY_B8CgU9E6hSdKDC3o_b93bEKf7ead92iK87lyPhNdjQJ9QOpkSWmfPR9ilGmXJ39oyxFia0lZv3Vv7H9NaxXc7wwmvG324Q7UbrQIprNJKRITfbm9Bzx5F1M4ePI5h8qSbFCkpCa8P5_GoOhHn4xBeL4vZ7BMalBHVtezdngD2o4k6KeY3kJH8GylYX_1UKucHsZx_AvczW3Ngbv99d_MT_IfIy1EJwm9PZbbkWXm8qZxfLWG8PvdQzoG2cgk0ep1a-I_KCyj2OlLX_JXknXGeKi121oWoZQDae0xw0tHoVH0waAl00JIafEUDfH7RgQ4agcapoKkcxuSSVgVQj8GNXiJV2l-nOue6kOmwhNecAe1bL3qkg9M2oif5XepP1CV3sR8Ir6cOQBuxqvg6c0D30G5KKoeBajuM8dwu_i95MWpKCO1E6GiI7wZJfjdFn2JHZ-yd8kB7QNM-z8mCOaLq3Yo-hVvbF5wCaHRTFZPVQx7nSGfBZfzc7b52i3idZX9_HD09SR-XmbuqTemj_gWT0scGd9o-pSw-XDFHR3Bn9xcuy8OX4H5V_mcRm23NVj6vfvRwQeOT0I8vxXXCOXk0B9r3-2ij7vG8cIdS98IANT1Qs5MSKBWBWkSFal55DkCpdd8ty_9d-BcqCq16un5528wdmck1O8n8hbmUwbSlLbSjlalhT_T7X_U_E_VbnVhTff_7o1OjmXgUX2cR95Hwb2y_XJaJl-Q3X2bzfPWJUCUjE2dLPw6NS7q-F1ZBK3QaJt507AD3Os5jxzIxrjFgImnRQUAEbV8PX54zy75EFO_TPGNf4DC2BGdn2ijitEQq9umSVAzcMAVIBxhECKgOxzNqGjCwdf6seJ3vVcUguAnQIR7Jt5YvafoZhyNSo5vvL85pGOrfIbyHiP1ETcVr0nt4ePwTlutsmVVHEoKJj08viS-6djLsLJ73oXmHh4c_H2ezibVqm6ynY4LSHmV0_j2Dp86NRs36XqE_GpvDcophgAZBdsLuUEGHHkleL9Q2V5t8Ixa4Xa74cp0XRcEW3ZbJtq2KsihQFCXbVIxVgjdywxkrxaaRC73ljBdsxYtlyVm-ztgk1TYbZJKXjSIFw15ok6XoZ87vFjqEEbdLxgqWL4xo0IRpBuY8MftpN33My7uF306EvRl3gRTM6BDD2UzU0eD2Yc5Nr8NxLP3R_LoYvdl-bUQgvJ7ghNQ_ZryvW_7fAAAA__9C9-Iu">