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After installing all dependencies, the very next step is to install IMAS itself. During this installation the cpp interface component is complaining about blitz not being compiled in thread-safe manner and suggests that maybe the -pthread flag was missing during Blitz compilation/installation. The bad news is that the whole eco-system was compiled using at least those two flags: '-fPIC -pthread', therefore the error is confusing. Below you can find an error message from reproduction attempt:

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make -C ./src/3.36.0/ual/4.10.1/examples/cpp all || exit 1
make[2]: Entering directory `/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/examples/cpp'
icpc `pkg-config blitz --cflags` -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/cppinterface/src -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/lowlevel -g -O0 -fPIC -shared-intel -c test_pulse_create.cpp
In file included from /marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m/include/blitz/array-impl.h(46),
                 from /marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m/include/blitz/array.h(37),
                 from /marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/cppinterface/src/UALDef.h(30),
                 from /marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/cppinterface/src/UALClasses.h(7),
                 from test_pulse_create.cpp(1):
/marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m/include/blitz/blitz.h(152): error: #error directive: Blitz is configured with --enable-threadsafe, but no compiler thread support is found. Did you forget, e.g., "--pthread"?
     #error Blitz is configured with --enable-threadsafe, but no compiler thread support is found. Did you forget, e.g., "--pthread"?
      ^

compilation aborted for test_pulse_create.cpp (code 2)
make[2]: *** [test_pulse_create.o] Error 2
make[2]: Leaving directory `/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/examples/cpp'
make[1]: *** [examples/cpp] Error 1
make[1]: Leaving directory `/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer'
make: *** [all] Error 2

As you can see for some reason IMAS is complaining on Blitz being compiled with --enable-threadsafe flag but at the same time no thread support for compiler is found:

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/marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m/include/blitz/blitz.h(152): error: #error directive: Blitz is configured with --enable-threadsafe, but no compiler thread support is found. Did you forget, e.g., "--pthread"?
     #error Blitz is configured with --enable-threadsafe, but no compiler thread support is found. Did you forget, e.g., "--pthread"?

How to reproduce issue

To avoid installing whole IMAS-Spack eco-system from scratch a minimal working example was prepared. This just takes the part of the IMAS code and tries to compile it the very same way as the IMAS installer does it.

Log in to Marconi cluster
Prepare $MODULEPATH thus the imasenv module can be found and loaded:
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module use /marconi/home/userexternal/msmukows/public/modules
Load imasenv/3.36.0/intel/2020-test module
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module load imasenv/3.36.0/intel/2020-test

Navigate to the directory with example code:

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cd /marconi_work/FUSIO_HLST/testdir/tests/blitz_pthread_issue_intel_2020

There should be a file named: "test_pulse_create.cpp":
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. └── test_pulse_create.cpp

Now execute compilation command:

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icpc `pkg-config blitz --cflags` -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/cppinterface/src -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/lowlevel -g -O0 -fPIC -shared-intel -c test_pulse_create.cpp

You should see the very same error message as above - Blitz -pthread error

Solution

After a long search a solution has been found, however it is not very elegant. Requires editing pkg-config for Blitz, which by default is prepared by SPACK.

The change is subtle and affects only CFLAGS which should look like this:

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Cflags: -I${includedir} -pthread

Below is a before and after comparison:

Vanilla Blitz's pkg-config - provided by SPACK

Changed pkg-config for Blitz

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# generated by configure / remove this line to disable regeneration
prefix=/marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: blitz
Description: blitz Library
Version: 0.10
Requires:
Libs: -L${libdir} -lblitz
Cflags: -I${includedir}

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# generated by configure / remove this line to disable regeneration
prefix=/marconi_work/FUSIO_HLST/switmdir/libs-intel/blitz/1.0.1/intel/19.1.3.304/hftjglypfr4ovoej6dkxwuedupjqez3m
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: blitz
Description: blitz Library
Version: 0.10
Requires:
Libs: -L${libdir} -lblitz
Cflags: -I${includedir} -pthread

The above solution acts the same way as adding the -pthread flag explicitly to the compilation command in point 6 at 2.1 How to reproduce issue, something like below:

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icpc `pkg-config blitz --cflags` -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/cppinterface/src -I/marconi_work/FUSIO_HLST/msmukows/IMAS_INSTALLER/intel_installer/src/3.36.0/ual/4.10.1/lowlevel -g -O0 -fPIC -shared-intel -c -pthread test_pulse_create.cpp

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