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bpo-45723: Add helpers for save/restore env (GH-29637) by erlend-aasland · Pull Request #29637 · python/cpython · GitHub
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bpo-45723: Add helpers for save/restore env (GH-29637)#29637

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tiran merged 6 commits into
python:mainfrom
erlend-aasland:ac-save-env
Nov 22, 2021
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bpo-45723: Add helpers for save/restore env (GH-29637)#29637
tiran merged 6 commits into
python:mainfrom
erlend-aasland:ac-save-env

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erlend-aasland commented Nov 19, 2021 •
edited by bedevere-bot
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erlend-aasland requested a review from tiran November 19, 2021 12:33

erlend-aasland commented Nov 19, 2021

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@tiran: there might be a smoother way to do this, but this should do the trick.

erlend-aasland mentioned this pull request Nov 19, 2021
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bpo-45723: Add helpers for save/restore env …
6579627
PoC: Apply to SQLite check.

erlend-aasland commented Nov 19, 2021

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Another option is to patch the built-in macros, but I prefer this explicit approach.

erlend-aasland commented Nov 19, 2021

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Possible improvement: minimise future configure diffs further, for improved review experience.

Proposed patch
diff --git a/configure.ac b/configure.ac index 02463ae717..90507e206b 100644 --- a/configure.ac +++ b/configure.ac @@ -32,21 +32,21 @@ dnl - WITH_SAVE_ENV([SCRIPT]) Runs SCRIPT wrapped with SAVE_ENV/RESTORE_ENV AC_DEFUN([_SAVE_VAR], [AS_VAR_COPY([save_][$1], [$1])])dnl AC_DEFUN([_RESTORE_VAR], [AS_VAR_COPY([$1], [save_][$1])])dnl AC_DEFUN([SAVE_ENV], - [_SAVE_VAR([CFLAGS])] - [_SAVE_VAR([CPPFLAGS])] - [_SAVE_VAR([LDFLAGS])] - [_SAVE_VAR([LIBS])] +[_SAVE_VAR([CFLAGS])] +[_SAVE_VAR([CPPFLAGS])] +[_SAVE_VAR([LDFLAGS])] +[_SAVE_VAR([LIBS])] )dnl AC_DEFUN([RESTORE_ENV], - [_RESTORE_VAR([CFLAGS])] - [_RESTORE_VAR([CPPFLAGS])] - [_RESTORE_VAR([LDFLAGS])] - [_RESTORE_VAR([LIBS])] +[_RESTORE_VAR([CFLAGS])] +[_RESTORE_VAR([CPPFLAGS])] +[_RESTORE_VAR([LDFLAGS])] +[_RESTORE_VAR([LIBS])] )dnl AC_DEFUN([WITH_SAVE_ENV], - [SAVE_ENV] - [$1] - [RESTORE_ENV] +[SAVE_ENV] +m4_strip([$1]) +[RESTORE_ENV] )dnl AC_SUBST(BASECPPFLAGS)

tiran reviewed Nov 19, 2021
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Comment thread configure.ac Outdated
Comment on lines +35 to +38
[_SAVE_VAR([CFLAGS])]
[_SAVE_VAR([CPPFLAGS])]
[_SAVE_VAR([LDFLAGS])]
[_SAVE_VAR([LIBS])]

tiran Nov 19, 2021

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality Hide comment

It looks like the indention adds some extra space to the output:

save_CFLAGS=$CFLAGS save_CPPFLAGS=$CPPFLAGS save_LDFLAGS=$LDFLAGS save_LIBS=$LIBS

erlend-aasland Nov 19, 2021

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Yeah. We can tweak the new macros to further minimise configure diffs. I think that could be worth it, as it would be easier to review future PRs.

erlend-aasland Nov 19, 2021

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Does it look better with dcc2ba9 applied?

erlend-aasland requested a review from tiran November 21, 2021 16:35
tiran approved these changes Nov 22, 2021
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Excellent!

tiran changed the title bpo-45723: Add helpers for save/restore env bpo-45723: Add helpers for save/restore env (GH-29637) Nov 22, 2021
tiran merged commit db2277a into python:main Nov 22, 2021
erlend-aasland deleted the ac-save-env branch November 22, 2021 08:17
remykarem pushed a commit to remykarem/cpython that referenced this pull request Dec 7, 2021
bpo-45723: Add helpers for save/restore env (pythonGH-29637)
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tiran mentioned this pull request Apr 22, 2022
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