unable to compile on arch linux with python 3.8

[jose1711]

..
config.status: creating pc/vapoursynth.pc
config.status: creating pc/vapoursynth-script.pc
config.status: creating Makefile
config.status: executing depfiles commands
config.status: executing libtool commands
  CXX      src/vspipe/vspipe.o
  CXX      src/vsscript/libvapoursynth_script_la-vsscript.lo
  CXXLD    libvapoursynth-script.la
  CXXLD    vspipe
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `Py_InitializeEx'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyDict_GetItemString'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyObject_GetAttrString'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `_Py_Dealloc'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyImport_ImportModule'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyCapsule_GetPointer'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyCapsule_IsValid'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyEval_SaveThread'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyGILState_Ensure'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `Py_IsInitialized'
collect2: error: ld returned 1 exit status
make: *** [Makefile:1324: vspipe] Error 1

this is an attempt to compile vapoursynth from aur (https://aur.archlinux.org/packages/vapoursynth-git/).

$ pacman -Q python
python 3.8.0-1

[myrsloik]

Do you have a more verbose log? It looks like it's not picking up the python library at all judging by the error.

[jose1711]

here is the output of the failing command with --verbose added

/usr/bin/ld --verbose -plugin /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/liblto_plugin.so -plugin-opt=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/lto-wrapper -plugin-opt=-fresolution=/tmp/ccWygwlP.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --build-id --eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -o .libs/vspipe /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/Scrt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtbeginS.o -L/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0 -L/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../.. -O1 --sort-common --as-needed -z relro -z now src/vspipe/vspipe.o ./.libs/libvapoursynth-script.so -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtendS.o /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crtn.o
GNU ld (GNU Binutils) 2.33.1
  Supported emulations:
   elf_x86_64
   elf32_x86_64
   elf_i386
   elf_iamcu
   elf_l1om
   elf_k1om
   i386pep
   i386pe
using internal linker script:
==================================================
/* Script for -pie -z combreloc -z now -z relro -z separate-code: position independent executable, combine & sort relocs with separate code segment */
/* Copyright (C) 2014-2019 Free Software Foundation, Inc.
   Copying and distribution of this script, with or without modification,
   are permitted in any medium without royalty provided the copyright
   notice and this notice are preserved.  */
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
	      "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
ENTRY(_start)
SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib64"); SEARCH_DIR("/usr/lib"); SEARCH_DIR("/usr/local/lib"); SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib");
SECTIONS
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    KEEP (*(SORT_NONE(.fini)))
  }
  PROVIDE (__etext = .);
  PROVIDE (_etext = .);
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  . = ALIGN(CONSTANT (MAXPAGESIZE));
  /* Adjust the address for the rodata segment.  We want to adjust up to
     the same address within the page on the next page up.  */
  . = SEGMENT_START("rodata-segment", ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1)));
  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
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  .gcc_except_table   : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) }
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  .tdata	  :
   {
     PROVIDE_HIDDEN (__tdata_start = .);
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   }
  .tbss		  : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
  .preinit_array    :
  {
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array))
    PROVIDE_HIDDEN (__preinit_array_end = .);
  }
  .init_array    :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
    KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
    PROVIDE_HIDDEN (__init_array_end = .);
  }
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  {
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
    KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
    PROVIDE_HIDDEN (__fini_array_end = .);
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  .ctors          :
  {
    /* gcc uses crtbegin.o to find the start of
       the constructors, so we make sure it is
       first.  Because this is a wildcard, it
       doesn't matter if the user does not
       actually link against crtbegin.o; the
       linker won't look for a file to match a
       wildcard.  The wildcard also means that it
       doesn't matter which directory crtbegin.o
       is in.  */
    KEEP (*crtbegin.o(.ctors))
    KEEP (*crtbegin?.o(.ctors))
    /* We don't want to include the .ctor section from
       the crtend.o file until after the sorted ctors.
       The .ctor section from the crtend file contains the
       end of ctors marker and it must be last */
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))
  }
  .dtors          :
  {
    KEEP (*crtbegin.o(.dtors))
    KEEP (*crtbegin?.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
    KEEP (*(SORT(.dtors.*)))
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  .jcr            : { KEEP (*(.jcr)) }
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   *(.dynbss)
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      FIXME: Why do we need it? When there is no .bss section, we do not
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}


==================================================
/usr/bin/ld: mode elf_x86_64
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/Scrt1.o succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/Scrt1.o
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crti.o succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crti.o
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtbeginS.o succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtbeginS.o
attempt to open src/vspipe/vspipe.o succeeded
src/vspipe/vspipe.o
attempt to open ./.libs/libvapoursynth-script.so succeeded
./.libs/libvapoursynth-script.so
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libstdc++.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libstdc++.a failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libstdc++.so succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libstdc++.so
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libm.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libm.a failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libm.so succeeded
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libm.so
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libm.so
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libm.so
attempt to open /usr/lib/libm.so.6 succeeded
/usr/lib/libm.so.6
attempt to open /usr/lib/libmvec_nonshared.a succeeded
/usr/lib/libmvec_nonshared.a
attempt to open /usr/lib/libmvec.so.1 succeeded
/usr/lib/libmvec.so.1
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.a failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so succeeded
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
attempt to open libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so.1 succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so.1
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libc.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libc.a failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libc.so succeeded
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libc.so
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libc.so
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libc.so
attempt to open /usr/lib/libc.so.6 succeeded
/usr/lib/libc.so.6
attempt to open /usr/lib/libc_nonshared.a succeeded
/usr/lib/libc_nonshared.a
(/usr/lib/libc_nonshared.a)elf-init.oS
attempt to open /usr/lib/ld-linux-x86-64.so.2 succeeded
/usr/lib/ld-linux-x86-64.so.2
/usr/lib/libc_nonshared.a
/usr/lib/ld-linux-x86-64.so.2
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.a failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so succeeded
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
opened script file /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so
attempt to open libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc_s.so.1 failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so.1 succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/libgcc_s.so.1
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/libgcc.a
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtendS.o succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/crtendS.o
attempt to open /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crtn.o succeeded
/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../lib/crtn.o
libm.so.6 needed by ./.libs/libvapoursynth-script.so
found libm.so.6 at /usr/lib/libm.so.6
ld-linux-x86-64.so.2 needed by ./.libs/libvapoursynth-script.so
found ld-linux-x86-64.so.2 at /usr/lib/ld-linux-x86-64.so.2
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `Py_InitializeEx'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyDict_GetItemString'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyObject_GetAttrString'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `_Py_Dealloc'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyImport_ImportModule'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyCapsule_GetPointer'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyCapsule_IsValid'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyEval_SaveThread'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `PyGILState_Ensure'
/usr/bin/ld: ./.libs/libvapoursynth-script.so: undefined reference to `Py_IsInitialized'
/usr/bin/ld: link errors found, deleting executable `.libs/vspipe'

[myrsloik]

Actually by pure coincidence someone mentioned the cause of this. It's python 3.8 very awkwardly changing what you have to do to link with it. See the --embed switch which got added in 3.8 just to break everything...
https://docs.python.org/3/whatsnew/3.8.html#debug-build-uses-the-same-abi-as-release-build

This will probably be fixed in the next release.

[insilications]

Adding the output of python3-config --libs --embed: -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm

To the appropriate places in the makefile fixes this.

[jnozsc]

sorry for bumping this
@insilications , may I know where did you modify? I think I may met the same issue

[dubhater]

@jnozsc You can just run make LIBS="$(python3-config --ldflags --embed)". No need to edit anything.