[macOS] Use --enable-optimizations in build-installer.py

[ronaldoussoren]

BPO	42235
Nosy	@ronaldoussoren, @vstinner, @ned-deily, @miss-islington
PRs	bpo-42235: [macOS] Use LTO/PGO in build-installer.py with new enough compilers #23079
Dependencies	bpo-41100: Support macOS 11 and Apple Silicon Macs

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

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GitHub fields:

assignee = None
closed_at = <Date 2021-05-03.03:49:30.740>
created_at = <Date 2020-11-01.16:31:13.737>
labels = ['OS-mac', 'type-feature', '3.10']
title = '[macOS] Use --enable-optimizations in build-installer.py'
updated_at = <Date 2021-08-02.03:26:38.949>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2021-08-02.03:26:38.949>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-03.03:49:30.740>
closer = 'ned.deily'
components = ['macOS']
creation = <Date 2020-11-01.16:31:13.737>
creator = 'ronaldoussoren'
dependencies = ['41100']
files = []
hgrepos = []
issue_num = 42235
keywords = ['patch']
message_count = 6.0
messages = ['380152', '380154', '380155', '392761', '392762', '393432']
nosy_count = 4.0
nosy_names = ['ronaldoussoren', 'vstinner', 'ned.deily', 'miss-islington']
pr_nums = ['23079']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42235'
versions = ['Python 3.10']

[ronaldoussoren]

With recent enough compilers it is possible to use --enable-optimzations when building the installer.

[vstinner]

See also bpo-41181 "[macOS] Build macOS installer with LTO and PGO optimizations".

[ronaldoussoren]

I'm working on a PR.

The current version of build-installer.py doesn't use LTO/PGO because installers are build on macOS 10.9 where the compiler doesn't reliably support this. Recent compilers should work a lot better.

The upcoming PR enables --enable-optimizations when building on macOS 10.15 or later (Xcode 11 or 12), mostly because that's what I'm testing with.

I'm listing 41100 as a dependency because having that is the only way to make use of this PR at the moment: build-installer.py uses --enable-universalsdk and 41100 introduces "universal2" as a set of architectures that can be build using Xcode 12. All other sets of architectures require Xcode 10 or older.

[ned-deily]

New changeset e08059e by Ronald Oussoren in branch 'master':
bpo-42235: [macOS] Use LTO/PGO in build-installer.py with new enough compilers (GH-23079)
e08059e

[ned-deily]

Thanks for the PR. I am only going to apply this to the 3.10 branch for now. Perhaps when we have more experience with it, it could be backported to 3.9.x. First appearance in 3.10.0b1.

[vstinner]

Thanks Ronald!