[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ned Deily]

Change by Ned Deily :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.10

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[miss-islington]

miss-islington  added the comment:


New changeset 6e665424d6e7abf6d6de010609a398a7407df83c by Miss Islington (bot) 
in branch '3.8':
bpo-38443: Check that the specified universal architectures work (GH-22910)
https://github.com/python/cpython/commit/6e665424d6e7abf6d6de010609a398a7407df83c


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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[miss-islington]

miss-islington  added the comment:


New changeset 748d38bf529d71d87cc7ef6d63e9df7d7d771ac9 by Miss Islington (bot) 
in branch '3.9':
[3.9] bpo-38443: Check that the specified universal architectures work 
(GH-22910) (GH-23451)
https://github.com/python/cpython/commit/748d38bf529d71d87cc7ef6d63e9df7d7d771ac9


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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[miss-islington]

Change by miss-islington :


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pull_requests: +22343
pull_request: https://github.com/python/cpython/pull/23452

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[miss-islington]

Change by miss-islington :


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pull_requests: +22342
pull_request: https://github.com/python/cpython/pull/23451

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[miss-islington]

miss-islington  added the comment:


New changeset 0f20bd9042c9b7fce20c3b9511cd0820b30094c3 by Ronald Oussoren in 
branch 'master':
bpo-38443: Check that the specified universal architectures work (GH-22910)
https://github.com/python/cpython/commit/0f20bd9042c9b7fce20c3b9511cd0820b30094c3


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nosy: +miss-islington

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I've added a PR with a variation of my earlier patch. This version will bail 
out when specifying "--enable-universalsdk" with a version of Xcode that does 
not support i386 (the previous patch did not).

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ronald Oussoren]

Change by Ronald Oussoren :


--
keywords: +patch
pull_requests: +21841
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/22910

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ronald Oussoren]

Ronald Oussoren  added the comment:

A fairly simple change is to check if compiling a file with the specified set 
of "-arch" flags works, and bail  out with a nice error message if it doesn't.

Something like this works:

diff --git a/configure.ac b/configure.ac
index f0bc8c6258..e26cdc8607 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1976,6 +1976,14 @@ yes)
 EXPORT_MACOSX_DEPLOYMENT_TARGET=''
 AC_MSG_RESULT($MACOSX_DEPLOYMENT_TARGET)
 
+   AC_MSG_CHECKING(if specified build architectures work)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+[AC_MSG_RESULT(yes)],
+[AC_MSG_RESULT(no)
+AC_MSG_ERROR(check the '--with-universal-archs' option)
+])
+
+
 # end of Darwin* tests
 ;;
 esac


I'm not entirely happy with the phrasing, but at least you'll get a clearer 
message and one that indicate which configure argument can be used to fix it.

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ned Deily]

Ned Deily  added the comment:

Also note that, on current macOS systems, specifying just --enable-universalsdk 
to ./configure results in an implicit --with-universal-archs of intel (which 
implies both x86_64 and i386).

checking for --enable-universalsdk... /
checking for --with-universal-archs... intel

With macOS 10.15 Catalina and Xcode 11, i364 arch is no longer supported and 
that results in another cryptic ./configure failure:

checking size of size_t... configure: error: in `/Users/sysadmin/cpython':
configure: error: cannot compute sizeof (size_t)
See `config.log' for more details

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[issue38443] unavailable --with-universal-archs= macOS confgure options fail cryptically

[Ned Deily]

New submission from Ned Deily :

./configure's --with-universal-archs= supports a number of different CPU 
architecture combinations.  However most of them are no longer supported on 
current macOS systems.  If you choose an option with archs not available in the 
build tool chain in use, the configure script fails in various cryptic ways, 
usually with multiple configure test failures like:

checking dlfcn.h presence... yes
configure: WARNING: dlfcn.h: present but cannot be compiled
configure: WARNING: dlfcn.h: check for missing prerequisite headers?
configure: WARNING: dlfcn.h: see the Autoconf documentation
configure: WARNING: dlfcn.h: section "Present But Cannot Be Compiled"
configure: WARNING: dlfcn.h: proceeding with the compiler's result
configure: WARNING: ## --- ##
configure: WARNING: ## Report this to https://bugs.python.org/ ##
configure: WARNING: ## --- ##

./configure should be more user-friendly here.  At a minimum, it should report 
near the beginning exactly which archs are going to be tested; it already 
reports the --with-universal-archs value.  Even better it should explicitly 
test for support of each arch in the build tool chain in use and stop if any of 
the requested archs are not available.

--
components: Build, macOS
messages: 354429
nosy: ned.deily, ronaldoussoren
priority: normal
severity: normal
stage: needs patch
status: open
title: unavailable --with-universal-archs= macOS confgure options fail 
cryptically
versions: Python 3.8, Python 3.9

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