VisIt (Python 3) fails to build with Intel compiler under CentOS 7.

[andymwood]

I'm trying to build VisIt with the Intel compiler under CentOS 7.

It fails when it tries to build Python 3, reporting this error message in the log file:

In file included from ./Include/Python.h(75),
                 from Parser/grammar1.c(4):
./Include/pyatomic.h(39): error: identifier "atomic_uintptr_t" is undefined
      atomic_uintptr_t _value;
      ^     

In file included from ./Include/Python.h(75),
                 from ./Programs/python.c(3):
./Include/pyatomic.h(39): error: identifier "atomic_uintptr_t" is undefined
      atomic_uintptr_t _value;
      ^     

In file included from ./Include/Python.h(75),
                 from Parser/node.c(3):
./Include/pyatomic.h(39): error: identifier "atomic_uintptr_t" is undefined
      atomic_uintptr_t _value;
      ^     

In file included from ./Include/Python.h(75),
                 from ./Include/pgenheaders.h(10),
                 from Parser/listnode.c(4):
./Include/pyatomic.h(39): error: identifier "atomic_uintptr_t" is undefined
      atomic_uintptr_t _value;
      ^     

compilation aborted for ./Programs/python.c (code 2)
make: *** [Programs/python.o] Error 2
make: *** Waiting for unfinished jobs....
compilation aborted for Parser/grammar1.c (code 2)

This appears to be an resolved issue in Python. The last comment on that bug report suggests that there's already a patch available that has been merged into the most recent version of Python.

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---

[andymwood]

I've now managed to build VisIt using Python 3.7.7 instead, setting the following environment variables prior to calling the build script:

export PYTHON3_URL=${PYTHON3_URL:-"https://www.python.org/ftp/python/3.7.7"}
export PYTHON3_FILE_SUFFIX="tgz"
export PYTHON3_VERSION=${PYTHON3_VERSION:-"3.7.7"}
export PYTHON3_COMPATIBILITY_VERSION=${PYTHON3_COMPATIBILITY_VERSION:-"3.7"}
export PYTHON3_FILE="Python-$PYTHON3_VERSION.$PYTHON3_FILE_SUFFIX"
export PYTHON3_BUILD_DIR="Python-$PYTHON3_VERSION"
export PYTHON3_MD5_CHECKSUM="d348d978a5387512fbc7d7d52dd3a5ef"

[griffin28]

Thanks @andymwood for updating us on what worked for you. What VisIt branch did you compile?

[andymwood]

I compiled from the source for 3.1.1 downloaded from here.

[griffin28]

This will be taken care of with #4634.