Problem building 28.8 in CentOS7 - can't find libpython.so

simon_ch

Hi there,

trying to build on CentOS7

one of the link stages fail because libklayout_pya.so requires libpython3.8.so.1.0 - which isn't specified in the linker options...

The command that fails is:

g++ -Wl,-O1 -Wl,-z,relro -Wl,-rpath,/home/cad/klayout/28.8 -Wl,-rpath-link,/usr/lib64 -o ../../../../build-release/strm2cif main.o -lz -L/mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../.. -lklayout_bd -lklayout_db -lklayout_tl -lklayout_gsi -lklayout_lib -lklayout_rdb -lklayout_lym -lklayout_rba -lklayout_pya /usr/lib64/libruby.so.2.0.0 -ldl -lQt5PrintSupport -lQt5Designer -lQt5MultimediaWidgets -lQt5Svg -lQt5Widgets -lQt5Multimedia -lQt5Gui -lQt5Xml -lQt5XmlPatterns -lQt5Network -lQt5Sql -lQt5Core -lGL -lpthread

I tried with:

./build.sh -prefix /home/cad/klayout/28.8

and

./build.sh -prefix /home/cad/klayout/28.8 -pylib /full/path/to/libpython3.8.so.1.0

Any idea what I'm doing wrong?

Here is the partial transcript...

gmake[3]: Leaving directory `/mnt/cad/klayout/git/klayout/build-release/buddies/src/bd' cd strm2cif/ && ( test -e Makefile || /usr/bin/qmake-qt5 -o Makefile /mnt/cad/klayout/git/klayout/src/buddies/src/strm2cif/strm2cif.pro CONFIG+=release RUBYLIBFILE=/usr/lib64/libruby.so.2.0.0 RUBYVERSIONCODE=20000 HAVE_RUBY=1 PYTHON=python3 PYTHONLIBFILE=/home/cad/anaconda/Anaconda3-2020.11/lib/libpython3.8.so.1.0 PYTHONINCLUDE=/home/cad/anaconda/Anaconda3-2020.11/include/python3.8 PYTHONEXTSUFFIX=.cpython-38-x86_64-linux-gnu.so HAVE_PYTHON=1 HAVE_QTBINDINGS=1 HAVE_QT_UITOOLS=1 HAVE_QT_NETWORK=1 HAVE_QT_SQL=1 HAVE_QT_SVG=1 HAVE_QT_PRINTSUPPORT=1 HAVE_QT_MULTIMEDIA=1 HAVE_QT_DESIGNER=1 HAVE_QT_XML=1 HAVE_64BIT_COORD=0 HAVE_QT=1 HAVE_CURL=0 HAVE_EXPAT=0 HAVE_PNG=0 PREFIX=/mnt/cad/klayout/28.8 RPATH=/home/cad/klayout/28.8 KLAYOUT_VERSION=0.28.8 KLAYOUT_VERSION_DATE=2023-06-06 KLAYOUT_VERSION_REV=0230783 ) && gmake -f Makefile gmake[3]: Entering directory `/mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif' g++ -Wl,-O1 -Wl,-z,relro -Wl,-rpath,/home/cad/klayout/28.8 -Wl,-rpath-link,/usr/lib64 -o ../../../../build-release/strm2cif main.o -lz -L/mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../.. -lklayout_bd -lklayout_db -lklayout_tl -lklayout_gsi -lklayout_lib -lklayout_rdb -lklayout_lym -lklayout_rba -lklayout_pya /usr/lib64/libruby.so.2.0.0 -ldl -lQt5PrintSupport -lQt5Designer -lQt5MultimediaWidgets -lQt5Svg -lQt5Widgets -lQt5Multimedia -lQt5Gui -lQt5Xml -lQt5XmlPatterns -lQt5Network -lQt5Sql -lQt5Core -lGL -lpthread /usr/bin/ld: warning: libpython3.8.so.1.0, needed by /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so, not found (try using -rpath or -rpath-link) /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `_Py_Dealloc' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyByteArray_Type' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyType_IsSubtype' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyErr_GivenExceptionMatches' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyExc_RuntimeError' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyEval_SetTrace' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyObject_HasAttrString' /mnt/cad/klayout/git/klayout/build-release/buddies/src/strm2cif/../../../libklayout_pya.so: undefined reference to `PyByteArray_Size'

Matthias

I'm not sure ... the Python library should not be need to be listed explicitly as libklayout_pya.so is already linked against it.

Like in my case:

$ ldd build-klayout-Desktop_Qt_5_15_2_GCC_64bit-Debug-QTBindings/libklayout_pya.so
    linux-vdso.so.1 (0x00007ffc21be5000)
    libpython3.10d.so.1.0 => /lib/x86_64-linux-gnu/libpython3.10d.so.1.0 (0x00007f3ed5e36000)
...

I assume in your case it is not found as the library is not located in a standard path. So you can try to follow the advice in the error message and include "/home/cad/anaconda/Anaconda3-2020.11/lib/" - which is the location of that library - in the RPATH:

build -rpath /home/cad/anaconda/Anaconda3-2020.11/lib ...

Alternatively you can patch ./src/buddies/src/buddy_app.pri and add the following in line 45:

LIBS += $$PYTHONLIBFILE

In that case I assume linking works, but you will need to set LD_LIBRARY_PATH when you run KLayout.

Matthias