[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

New submission from Sourish Basu :

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 issue 38527 was fixed in 3.10. Perhaps fixing it on Solaris broke it on 
some other platforms?

--
components: Installation
messages: 403951
nosy: sourish.basu
priority: normal
severity: normal
status: open
title: configure script cannot detect float word ordering on linux
type: compile error
versions: Python 3.10

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

See attached my config log.

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

--
Added file: https://bugs.python.org/file50364/config.log

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

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
 D d

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

conftest.c attached

--
Added file: https://bugs.python.org/file50375/conftest.c

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

conftest.o attached

--
Added file: https://bugs.python.org/file50374/conftest.o

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

conftest_unoptimized.o uploaded

--
Added file: https://bugs.python.org/file50376/conftest_unoptimized.o

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[issue45477] configure script cannot detect float word ordering on linux

[Sourish Basu]

Sourish Basu  added the comment:

By enabling and disabling optimization flags one by one, I figured out it was 
'-ipo' (inter-procedural optimization) that was the problem. Without that flag, 
'configure' is successful. However, now I have a 'make' error:

./Programs/_testembed.c(1774): error: "__builtin_types_compatible_p" is only 
allowed in C
  config_set_argv(&config, Py_ARRAY_LENGTH(argv), argv);
   ^

compilation aborted for ./Programs/_testembed.c (code 2)
make[3]: *** [Programs/_testembed.o] Error 2

--

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