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configure script cannot detect float word ordering on linux · Issue #89640 · python/cpython · GitHub

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configure script cannot detect float word ordering on linux #89640

Closed
#126569
#126387
Closed
configure script cannot detect float word ordering on linux#89640
#126569
#126387
Labels
3.10 (EOL)end of lifebuildThe build process and cross-buildtopic-installation

Description

sourishbasu
mannequin
opened on Oct 14, 2021
BPO 45477
Nosy @tiran
Files
  • config.log
  • conftest.o
  • conftest.c
  • conftest_unoptimized.o
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

    Show more details

    GitHub fields:

    assignee = None
closed_at = None
created_at = <Date 2021-10-14.21:19:53.235>
labels = ['build', 'expert-installation', '3.10']
title = 'configure script cannot detect float word ordering on linux'
updated_at = <Date 2021-10-22.22:49:31.555>
user = 'https://bugs.python.org/sourishbasu'

    bugs.python.org fields:

    activity = <Date 2021-10-22.22:49:31.555>
actor = 'sourish.basu'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Installation']
creation = <Date 2021-10-14.21:19:53.235>
creator = 'sourish.basu'
dependencies = []
files = ['50364', '50374', '50375', '50376']
hgrepos = []
issue_num = 45477
keywords = []
message_count = 12.0
messages = ['403951', '403978', '404096', '404135', '404138', '404447', '404448', '404449', '404450', '404459', '404463', '404836']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'sourish.basu']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue45477'
versions = ['Python 3.10']

    Linked PRs

    Activity

    1. sourishbasu commented on Oct 14, 2021

      sourishbasumannequin
      on Oct 14, 2021
      MannequinAuthor

      I am trying to compile Python 3.10.0 on a Red Hat linux system with intel C/C++ compilers. This is my configure command:

      ./configure --with-computed-gotos --without-gcc --with-ensurepip=install --enable-optimizations --with-libm=-limf --with-cxx-main=icpc --with-threads --enable-ipv6 --with-signal-module CC=icc CXX=icpc LD=xild AR=xiar LIBS='-lpthread -limf -lirc' CFLAGS='-O3 -fPIC -fp-model strict -fp-model source -axCORE-AVX512,CORE-AVX2 -xAVX -ipo -prec-div -prec-sqrt' LDFLAGS='-ipo' CPP='icc -E'

      The failure comes as follows:

      checking for --with-libm=STRING... set LIBM="-limf"
checking for --with-libc=STRING... default LIBC=""
checking for x64 gcc inline assembler... yes
checking whether float word ordering is bigendian... unknown
configure: error:

Unknown float word ordering. You need to manually preset
ax_cv_c_float_words_bigendian=no (or yes) according to your system.

      I saw bpo-38527 was fixed in 3.10. Perhaps fixing it on Solaris broke it on some other platforms?

    2. sourishbasu
      added
      3.10 (EOL)end of life
      topic-installation
      buildThe build process and cross-build
      on Oct 14, 2021

    3. tiran commented on Oct 15, 2021

      tiran
      on Oct 15, 2021
      Member

      Python uses the AX_C_FLOAT_WORDS_BIGENDIAN macro from autoconf-archive to detect byte order of floats. You can find the code at https://www.gnu.org/software/autoconf-archive/ax_c_float_words_bigendian.html .

      Please attach your config.log file and the conftest.o output file of the follow command:

      $ cat > conftest.c << EOF
double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;
EOF
$ icc -c conftest.c

    4. sourishbasu commented on Oct 16, 2021

      sourishbasumannequin
      on Oct 16, 2021
      MannequinAuthor

      See attached my config log.

      When I tried to compile conftest.c with 'icc -c conftest.c', it produced 'conftest.o' without any errors.

    5. tiran commented on Oct 17, 2021

      tiran
      on Oct 17, 2021
      Member

      Please build conftest.o with compiler flags

      icc -c -O3 -fPIC -fp-model strict -fp-model source -axCORE-AVX512,CORE-AVX2 -xAVX -ipo -prec-div -prec-sqrt

      and attach the file.

    6. sourishbasu commented on Oct 17, 2021

      sourishbasumannequin
      on Oct 17, 2021
      MannequinAuthor

      I executed:

      $ icc -c -O3 -fPIC -fp-model strict -fp-model source -axCORE-AVX512,CORE-AVX2 -xAVX -ipo -prec-div -prec-sqrt conftest.c

      and conftest.o was built without errors. It has one symbol, as expected:

      $ nm conftest.o
                 U __must_be_linked_with_icc_or_xild
0000000000000000 D d

    7. tiran commented on Oct 20, 2021

      tiran
      on Oct 20, 2021
      Member

      Please upload and attach the .o file to this bug. I need to see the content of the file.

    8. sourishbasu commented on Oct 20, 2021

      sourishbasumannequin
      on Oct 20, 2021
      MannequinAuthor

      conftest.o attached

    9. sourishbasu commented on Oct 20, 2021

      sourishbasumannequin
      on Oct 20, 2021
      MannequinAuthor

      conftest.c attached

    10. tiran commented on Oct 20, 2021

      tiran
      on Oct 20, 2021
      Member

      Your conftest.o does not contain the magic string "seesnoon". Either ICC uses a different serialization format or your CFLAGS optimize the value away.

      Please run

      icc -c -o conftest_unoptimized.o conftest.c

      and upload "conftest_unoptimized.o".

    11. 48 remaining items

    12. erlend-aasland
      closed this as completedin #126569on Nov 8, 2024
    13. erlend-aasland
      added a commit that references this issue on Nov 8, 2024

      gh-89640: Restore configure error message on failure to detect float …

      403410f
    14. hoodmane
      added a commit that references this issue on Nov 12, 2024

      pythongh-89640 Pull in update to float word order detection in autoco…

      c4cee99
    15. hoodmane
      reopened this on Nov 12, 2024
    16. hoodmane
      added a commit that references this issue on Nov 13, 2024

      pythongh-89640 Pull in update to float word order detection in autoco…

      ea9a348
    17. erlend-aasland
      added a commit that references this issue on Nov 13, 2024

      gh-89640: Pull in update to float word order detection in autoconf-ar…

      142104c
    18. erlend-aasland
      closed this as completedon Nov 13, 2024
    19. picnixz
      added 3 commits that reference this issue on Dec 8, 2024

      pythongh-89640: Hardcode WASM float word ordering as little endian (p…

      6a36ba4

      pythongh-89640: Restore configure error message on failure to detect …

      caf2dd8

      pythongh-89640: Pull in update to float word order detection in autoc…

      03f8a7b
    20. ebonnal
      added 4 commits that reference this issue on Jan 12, 2025

      pythongh-89640: properly detect float word ordering on Linux (python#…

      8560e94

      pythongh-89640: Hardcode WASM float word ordering as little endian (p…

      c20bca0

      pythongh-89640: Restore configure error message on failure to detect …

      fcde1ee

      pythongh-89640: Pull in update to float word order detection in autoc…

      679440b
    21. thesamesam
      added a commit that references this issue on May 10, 2025

      dev-lang/python: drop -ffat-lto-objects for >=3.12

      e371afa
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