[issue34960] macOS builds expose stack_size option in LINKEDFOORSHARED and pyconfig

[Simon Wells]

Simon Wells  added the comment:

oh the rabbit hole...

as i have other builds of python3.7 on my system i wanted to ensure it used the 
correct python and python-config (python 3.7 was built and installed into 
$HOME/Projects/python/inst/) as such its a rather convoluted configure command 
for libxml2

LDFLAGS="-L$HOME/Projects/python/inst/lib" 
PATH=/Users/simon/Projects/python/inst/bin/:$PATH ./configure 
--prefix=/Users/simon/Projects/python/inst/ 
--with-python=/Users/simon/Projects/python/inst/bin/python3 
--with-python-install-dir=/Users/simon/Projects/python/inst/lib/python3.7/site-packages

the LDFLAGS envvar was required as python-config --ldflags also does not 
provide -L for the python libary

$make
ld: library not found for -lpython3.7m

in config.log for libxml2 (PYTHON_LIBS which is the output of 
$HOME/Projects/python/python3-config --ldflags)
PYTHON_LIBS='-lpython3.7m -ldl -framework CoreFoundation 
-Wl,-stack_size,100 -framework CoreFoundation'


after LDFLAGS="..." is added

$make
...
  CCLD libxml2mod.la
ld: -stack_size option can only be used when linking a main executable
clang: error: linker command failed with exit code 1 (use -v to see invocation)

if you want more log lines please let me know but those should be the only 
relevant ones

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[issue34960] macOS builds expose stack_size option in LINKEDFOORSHARED and pyconfig

[Ned Deily]

Ned Deily  added the comment:

OK, now I finally get it, thanks, my fault.  Yes, we probably shouldn't be 
passing stack_size through to applications trying to embed Python in 
LINkFORSHARED and pyconfig.  That's an area that we don't test very well nor 
have tests for, AFAIK.  Would it possible for you to provide a simple example 
of building libxml2 that would allow us to more easily test this?

https://docs.python.org/3/extending/embedding.html#compiling-and-linking-under-unix-like-systems

--
title: python-config bad ldflags on macOS -> macOS builds expose stack_size 
option in LINKEDFOORSHARED and pyconfig
versions: +Python 3.8

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