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cleconte987 opened this issue Mar 21, 2020 · 14 comments
Closed

Cannot install pandas correctly due to unreachable code #32882

cleconte987 opened this issue Mar 21, 2020 · 14 comments
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Build Library building on various platforms

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@cleconte987
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After running python setup.py build_ext --inplace -j 0:

Screenshot 2020-03-21 at 12 26 39

MacOS 10.14
python 3.6.6

I tried to install pandas from source in a setup virtual environment using pip.
I cloned the repository, created the virtual environment with python -m venv.
I ran pip install -r requirements-dev.txt
Had a few problems with versions of dependencies being too recent and not satisfying requirements, but I manually downgraded them.
And when I ran the above "python setup.py build_ext --inplace -j 0" I got the issue mentioned.

Thanks for your help
@ShaharNaveh
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@cleconte987 Thank you for the report!

As a quick-fix I would have remove the -Werror" flag from setup.py, meaning turning this line:

pandas/setup.py

Line 436 in aee8e11

extra_compile_args = ["-Werror"]

from:

extra_compile_args = ["-Werror"]

to:

extra_compile_args = []

@ShaharNaveh ShaharNaveh added the Build Library building on various platforms label Mar 21, 2020
@ShaharNaveh
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@WillAyd Is it a good idea to have something like:

if is_platform_windows():
    extra_compile_args = []
    ...
elif is_platform_macos():
    extra_compile_args = []
    ...
else:
    extra_compile_args = ["-Werror"]
    ...

in setup.py?

@WillAyd
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WillAyd commented Mar 21, 2020 via email

@cleconte987
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I don’t think we need to do that. clang / gcc mostly have the same flags, and if anything checking in clang is a little looser Can you post the full traceback (not a screenshot)?
On Mar 21, 2020, at 11:23 AM, MomIsBestFriend @.***> wrote: @WillAyd https://github.com/WillAyd Is it a good idea to have something like: if is_platform_windows(): extra_compile_args = [] ... elif is_platform_macos(): extra_compile_args = [] ... else: extra_compile_args = ["-Werror"] ... in setup.py? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#32882 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAEU4UMFPAWPFKYTLCJR6JDRIUA2NANCNFSM4LQ4J44Q.
William Ayd [email protected]

Here are the whole logs:

running build_ext
building 'pandas._libs.algos' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/algos.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/algos.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/algos.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/algos.cpython-36m-darwin.so
building 'pandas._libs.groupby' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/groupby.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/groupby.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/groupby.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/groupby.cpython-36m-darwin.so
building 'pandas._libs.hashing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/hashing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/hashing.cpython-36m-darwin.so
building 'pandas._libs.hashtable' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/hashtable.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashtable.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashtable.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/hashtable.cpython-36m-darwin.so
building 'pandas._libs.index' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/index.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/index.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/index.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/index.cpython-36m-darwin.so
building 'pandas._libs.indexing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/indexing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/indexing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/indexing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/indexing.cpython-36m-darwin.so
building 'pandas._libs.internals' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/internals.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/internals.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/internals.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/internals.cpython-36m-darwin.so
building 'pandas._libs.interval' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/interval.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/interval.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/interval.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/interval.cpython-36m-darwin.so
building 'pandas._libs.join' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/join.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/join.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/join.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/join.cpython-36m-darwin.so
building 'pandas._libs.lib' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs -I./pandas/_libs -I./pandas/_libs/tslibs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/lib.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/lib.o -Werror
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs -I./pandas/_libs -I./pandas/_libs/tslibs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/src/parser/tokenizer.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src/parser/tokenizer.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/lib.o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src/parser/tokenizer.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/lib.cpython-36m-darwin.so
building 'pandas._libs.missing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -I./pandas/_libs/tslibs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/missing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/missing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/missing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/missing.cpython-36m-darwin.so
building 'pandas._libs.parsers' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/parsers.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/parsers.o -Werror
pandas/_libs/parsers.c:50827:52: error: code will never be executed
[-Werror,-Wunreachable-code]
} else if (PY_VERSION_HEX >= 0x030700A0 && flag == (METH_FASTCAL...
^~~~
pandas/_libs/parsers.c:50827:38: note: silence by adding parentheses to mark
code as explicitly dead
} else if (PY_VERSION_HEX >= 0x030700A0 && flag == (METH_FASTCAL...
^
/* DISABLES CODE */ ( )
1 error generated.
error: command 'gcc' failed with exit status 1

@cleconte987
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@cleconte987 Thank you for the report!

As a quick-fix I would have remove the -Werror" flag from setup.py, meaning turning this line:

pandas/setup.py

Line 436 in aee8e11

extra_compile_args = ["-Werror"]

from:

extra_compile_args = ["-Werror"]

to:

extra_compile_args = []

Ok I will try!

@WillAyd
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WillAyd commented Mar 21, 2020

@cleconte987 can you post the output of pd.show_versions()?

@cleconte987
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cleconte987 commented Mar 21, 2020 •
edited
Loading

Actually the full full logs the first time I did it are these ones:

Compiling pandas/_libs/algos.pyx because it changed.
Compiling pandas/_libs/groupby.pyx because it changed.
Compiling pandas/_libs/hashing.pyx because it changed.
Compiling pandas/_libs/hashtable.pyx because it changed.
Compiling pandas/_libs/index.pyx because it changed.
Compiling pandas/_libs/indexing.pyx because it changed.
Compiling pandas/_libs/internals.pyx because it changed.
Compiling pandas/_libs/interval.pyx because it changed.
Compiling pandas/_libs/join.pyx because it changed.
Compiling pandas/_libs/lib.pyx because it changed.
Compiling pandas/_libs/missing.pyx because it changed.
Compiling pandas/_libs/parsers.pyx because it changed.
Compiling pandas/_libs/reduction.pyx because it changed.
Compiling pandas/_libs/ops.pyx because it changed.
Compiling pandas/_libs/ops_dispatch.pyx because it changed.
Compiling pandas/_libs/properties.pyx because it changed.
Compiling pandas/_libs/reshape.pyx because it changed.
Compiling pandas/_libs/sparse.pyx because it changed.
Compiling pandas/_libs/tslib.pyx because it changed.
Compiling pandas/_libs/tslibs/c_timestamp.pyx because it changed.
Compiling pandas/_libs/tslibs/ccalendar.pyx because it changed.
Compiling pandas/_libs/tslibs/conversion.pyx because it changed.
Compiling pandas/_libs/tslibs/fields.pyx because it changed.
Compiling pandas/_libs/tslibs/frequencies.pyx because it changed.
Compiling pandas/_libs/tslibs/nattype.pyx because it changed.
Compiling pandas/_libs/tslibs/np_datetime.pyx because it changed.
Compiling pandas/_libs/tslibs/offsets.pyx because it changed.
Compiling pandas/_libs/tslibs/parsing.pyx because it changed.
Compiling pandas/_libs/tslibs/period.pyx because it changed.
Compiling pandas/_libs/tslibs/resolution.pyx because it changed.
Compiling pandas/_libs/tslibs/strptime.pyx because it changed.
Compiling pandas/_libs/tslibs/timedeltas.pyx because it changed.
Compiling pandas/_libs/tslibs/timestamps.pyx because it changed.
Compiling pandas/_libs/tslibs/timezones.pyx because it changed.
Compiling pandas/_libs/tslibs/tzconversion.pyx because it changed.
Compiling pandas/_libs/testing.pyx because it changed.
Compiling pandas/_libs/window/aggregations.pyx because it changed.
Compiling pandas/_libs/window/indexers.pyx because it changed.
Compiling pandas/_libs/writers.pyx because it changed.
Compiling pandas/io/sas/sas.pyx because it changed.
[ 1/40] Cythonizing pandas/_libs/algos.pyx
[ 2/40] Cythonizing pandas/_libs/groupby.pyx
warning: pandas/_libs/groupby.pyx:1097:26: Unreachable code
[ 3/40] Cythonizing pandas/_libs/hashing.pyx
[ 4/40] Cythonizing pandas/_libs/hashtable.pyx
[ 5/40] Cythonizing pandas/_libs/index.pyx
[ 6/40] Cythonizing pandas/_libs/indexing.pyx
[ 7/40] Cythonizing pandas/_libs/internals.pyx
[ 8/40] Cythonizing pandas/_libs/interval.pyx
[ 9/40] Cythonizing pandas/_libs/join.pyx
[10/40] Cythonizing pandas/_libs/lib.pyx
[11/40] Cythonizing pandas/_libs/missing.pyx
[12/40] Cythonizing pandas/_libs/ops.pyx
[13/40] Cythonizing pandas/_libs/ops_dispatch.pyx
[14/40] Cythonizing pandas/_libs/parsers.pyx
[15/40] Cythonizing pandas/_libs/properties.pyx
[16/40] Cythonizing pandas/_libs/reduction.pyx
[17/40] Cythonizing pandas/_libs/reshape.pyx
[18/40] Cythonizing pandas/_libs/sparse.pyx
[19/40] Cythonizing pandas/_libs/testing.pyx
[20/40] Cythonizing pandas/_libs/tslib.pyx
[21/40] Cythonizing pandas/_libs/tslibs/c_timestamp.pyx
[22/40] Cythonizing pandas/_libs/tslibs/ccalendar.pyx
[23/40] Cythonizing pandas/_libs/tslibs/conversion.pyx
warning: pandas/_libs/tslibs/conversion.pyx:598:53: Buffer unpacking not optimized away.
warning: pandas/_libs/tslibs/conversion.pyx:598:53: Buffer unpacking not optimized away.
[24/40] Cythonizing pandas/_libs/tslibs/fields.pyx
[25/40] Cythonizing pandas/_libs/tslibs/frequencies.pyx
[26/40] Cythonizing pandas/_libs/tslibs/nattype.pyx
[27/40] Cythonizing pandas/_libs/tslibs/np_datetime.pyx
[28/40] Cythonizing pandas/_libs/tslibs/offsets.pyx
[29/40] Cythonizing pandas/_libs/tslibs/parsing.pyx
[30/40] Cythonizing pandas/_libs/tslibs/period.pyx
[31/40] Cythonizing pandas/_libs/tslibs/resolution.pyx
[32/40] Cythonizing pandas/_libs/tslibs/strptime.pyx
[33/40] Cythonizing pandas/_libs/tslibs/timedeltas.pyx
[34/40] Cythonizing pandas/_libs/tslibs/timestamps.pyx
[35/40] Cythonizing pandas/_libs/tslibs/timezones.pyx
[36/40] Cythonizing pandas/_libs/tslibs/tzconversion.pyx
[37/40] Cythonizing pandas/_libs/window/aggregations.pyx
[38/40] Cythonizing pandas/_libs/window/indexers.pyx
[39/40] Cythonizing pandas/_libs/writers.pyx
[40/40] Cythonizing pandas/io/sas/sas.pyx
running build_ext
building 'pandas._libs.algos' extension
creating build
creating build/temp.macosx-10.9-x86_64-3.6
creating build/temp.macosx-10.9-x86_64-3.6/pandas
creating build/temp.macosx-10.9-x86_64-3.6/pandas/_libs
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/algos.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/algos.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/algos.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/algos.cpython-36m-darwin.so
building 'pandas._libs.groupby' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/groupby.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/groupby.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/groupby.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/groupby.cpython-36m-darwin.so
building 'pandas._libs.hashing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/hashing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/hashing.cpython-36m-darwin.so
building 'pandas._libs.hashtable' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/hashtable.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashtable.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/hashtable.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/hashtable.cpython-36m-darwin.so
building 'pandas._libs.index' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/index.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/index.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/index.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/index.cpython-36m-darwin.so
building 'pandas._libs.indexing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/indexing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/indexing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/indexing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/indexing.cpython-36m-darwin.so
building 'pandas._libs.internals' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/internals.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/internals.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/internals.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/internals.cpython-36m-darwin.so
building 'pandas._libs.interval' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/interval.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/interval.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/interval.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/interval.cpython-36m-darwin.so
building 'pandas._libs.join' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/join.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/join.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/join.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/join.cpython-36m-darwin.so
building 'pandas._libs.lib' extension
creating build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src
creating build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src/parser
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs -I./pandas/_libs/tslibs -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/lib.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/lib.o -Werror
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -Ipandas/_libs -I./pandas/_libs/tslibs -I./pandas/_libs -Ipandas/_libs/src/klib -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/src/parser/tokenizer.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src/parser/tokenizer.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/lib.o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/src/parser/tokenizer.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/lib.cpython-36m-darwin.so
building 'pandas._libs.missing' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs/tslibs -I./pandas/_libs -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/missing.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/missing.o -Werror
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/missing.o -o /Users/clement/Desktop/Contributing_to_pandas/pandas/_libs/missing.cpython-36m-darwin.so
building 'pandas._libs.parsers' extension
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -DNPY_NO_DEPRECATED_API=0 -I./pandas/_libs -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/clement/Desktop/Contributing_to_pandas/lib/python3.6/site-packages/numpy/core/include -I/Users/clement/Desktop/Contributing_to_pandas/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c pandas/_libs/parsers.c -o build/temp.macosx-10.9-x86_64-3.6/pandas/_libs/parsers.o -Werror
pandas/_libs/parsers.c:50827:52: error: code will never be executed [-Werror,-Wunreachable-code]
} else if (PY_VERSION_HEX >= 0x030700A0 && flag == (METH_FASTCALL | METH_KEYWORDS)) {
^~~~
pandas/_libs/parsers.c:50827:38: note: silence by adding parentheses to mark code as explicitly dead
} else if (PY_VERSION_HEX >= 0x030700A0 && flag == (METH_FASTCALL | METH_KEYWORDS)) {
^
/* DISABLES CODE */ ( )
1 error generated.
error: command 'gcc' failed with exit status 1

Notice the warning: Unreachable code for pandas/_libs/groupby.pyx

pandas is not installed yet so I cannot do pd.show_versions(). Or pandas is installed but I cannot import it from source as C extensions are not built:

ImportError: C extension: No module named 'pandas._libs.tslibs.conversion' not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace --force' to build the C extensions first.

@WillAyd
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WillAyd commented Mar 21, 2020 via email

@cleconte987
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Yes the Cython version is 0.29.15
C Compiler (not sure which part is important so I put everything): [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)]
How can I attach the parsers.c file?

Here is a snippet containing line 50827:

#if CYTHON_COMPILING_IN_CPYTHON static CYTHON_INLINE PyObject* __Pyx_CallUnboundCMethod1(__Pyx_CachedCFunction* cfunc, PyObject* self, PyObject* arg) { if (likely(cfunc->func)) { int flag = cfunc->flag; if (flag == METH_O) { return (*(cfunc->func))(self, arg); } else if (PY_VERSION_HEX >= 0x030600B1 && flag == METH_FASTCALL) { if (PY_VERSION_HEX >= 0x030700A0) { return (*(__Pyx_PyCFunctionFast)(void*)(PyCFunction)cfunc->func)(self, &arg, 1); } else { return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, &arg, 1, NULL); } } else if (PY_VERSION_HEX >= 0x030700A0 && flag == (METH_FASTCALL | METH_KEYWORDS)) { return (*(__Pyx_PyCFunctionFastWithKeywords)(void*)(PyCFunction)cfunc->func)(self, &arg, 1, NULL); } } return __Pyx__CallUnboundCMethod1(cfunc, self, arg); } #endif

@joooeey
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joooeey commented May 26, 2020

ImportError: C extension: No module named 'pandas._libs.tslibs.conversion' not built. If you want to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace --force' to build the C extensions first.

In #34280 I solved a similar error by re-installing the C-compiler and then running

python setup.py build_ext --inplace --force

Maybe that works here too?

@cleconte987
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I used the turn-around proposed by @MomIsBestFriend to build pandas.

@Chaz6
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Chaz6 commented Sep 23, 2020

I just ran into this with Clang 10 on CentOS 7.

 build/temp.linux-x86_64-3.9/pandas/_libs/algos.o -Werror
  pandas/_libs/algos.c:81785:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/algos.c:83402:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/algos.c:84302:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/algos.c:85202:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/algos.c:85385:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/algos.c:86285:3: error: code will never be executed [-Werror,-Wunreachable-code]
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_arr.rcbuffer->pybuffer);
    ^~~~~~~~~~~~~~~~~~~~~~~
  6 errors generated.
  error: command '/home/chaz/.local/bin/clang' failed with exit code 1

@Chaz6 Chaz6 mentioned this issue Oct 24, 2020
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3 tasks
@anzhi0708
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Same error on Termux (Android Linux simulator).
'''
[ 2/40] Cythonizing pandas/_libs/groupby.pyx
warning: pandas/_libs/groupby.pyx: 1135: 26: Unreachable code
'''
and lots of 'code will never be executed' error. Fails with exit code 1.

@mroeschke mroeschke changed the title Cannot install pandas correctly in a particular environment using pip Cannot install pandas correctly due to unreachable code Jul 30, 2021
@mroeschke
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Since this is an older version being built that we no longer support, closing. But can reopen if something similar is found in the future

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@Chaz6 @WillAyd @mroeschke @cleconte987 @joooeey @ShaharNaveh @anzhi0708