Description

lazka

opened on Sep 11, 2025

Issue body actions

Bug report

Bug description:

Looking at the Android build here: https://www.python.org/downloads/android/

The .pc files look like this:

# See: man pkg-config
prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: Python
Description: Build a C extension for Python
Requires:
Version: 3.14
Libs.private: -ldl  -llog
Libs: -L${libdir} $(BLDLIBRARY)
Cflags: -I${includedir}/python3.14

The "Libs:" line contains some autotools internals instead of the library name resulting in linker errors like:

cannot find $(BLDLIBRARY): No such file or directory

Might be related to #115780

Disclaimer: The main reason I'm reporting this is that it also breaks the Cygwin build in the same way, but that's not a supported platform, so this is the next best thing. i.e. I've not actually tested on Android.

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• GH-138800: fix variable substitution in python3.pc for Android #144776
• [3.15] GH-138800: Fix variable substitution in python3.pc for Android (GH-144776) #155107
• [3.14] GH-138800: Fix variable substitution in python3.pc for Android (GH-144776) #155108
• [3.13] GH-138800: Fix variable substitution in python3.pc for Android (GH-144776) #155111

Activity

1. lazka

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Sep 11, 2025
2. StanFromIreland

   added

   OS-android

   on Sep 11, 2025
3. StanFromIreland commented on Sep 11, 2025

   

   StanFromIreland

   on Sep 11, 2025

   Member

   More actions

   cc @mhsmith
4. picnixz

   added

   buildThe build process and cross-buildThe build process and cross-build

   on Sep 11, 2025
5. lazka

   added a commit that references this issue on Sep 12, 2025

   Work around broken pc file

   f50419a
6. mhsmith commented on Sep 12, 2025

   

   mhsmith

   on Sep 12, 2025

   Member

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   Thanks for the report. I guess $(BLDLIBRARY) should probably be replaced with -lpython3.14. However, I'm not currently aware of anyone who uses the .pc file on Android, so I won't pick this up this myself just now.
7. lazka commented on Sep 12, 2025

   

   lazka

   on Sep 12, 2025

   ContributorAuthor

   More actions

   Fair enough, I've hackily worked this around downstream now.
8. lazka

   added 7 commits that reference this issue on Sep 23, 2025

   Work around broken pc file

   6c5ef6a

   Work around broken pc file

   7a2688e

   configure: Work around broken pc file

   4472a0b

   configure: Work around broken pc file

   3f4722f

   configure: Work around broken pc file

   b74ea9a

   configure: Work around broken pc file

   ea8e558

   configure: Work around broken pc file

   2293bf6
9. mhsmith commented on Dec 16, 2025

   

   mhsmith

   on Dec 16, 2025

   Member

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   This affects any package using Meson, which uses pkgconfig to detect Python, so I'll implement a workaround in cibuildwheel.

   Example error:

   FAILED: numpy/_core/_struct_ufunc_tests.cpython-313-aarch64-linux-android.so 
   /Users/msmith/Library/Android/sdk/ndk/27.3.13750724/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android24-clang  -o numpy/_core/_struct_ufunc_tests.cpython-313-aarch64-linux-android.so numpy/_core/_struct_ufunc_tests.cpython-313-aarch64-linux-android.so.p/src_umath__struct_ufunc_tests.c.o -L/private/var/folders/2t/th8vxc813_gcch7lkh1sbbmc0000gp/T/cibw-run-5ef4oo3_/cp313-android_arm64_v8a/python/prefix/lib -I/private/var/folders/2t/th8vxc813_gcch7lkh1sbbmc0000gp/T/cibw-run-5ef4oo3_/cp313-android_arm64_v8a/python/prefix/include -Wl,--as-needed -Wl,--allow-shlib-undefined -Wl,-O1 -shared -fPIC -lm -Wl,--build-id=sha1 -Wl,--no-rosegment -Wl,-z,max-page-size=16384 -Wl,--no-undefined -D__BIONIC_NO_PAGE_SIZE_MACRO -DNDEBUG -O3 -Wall '$(BLDLIBRARY)'
   clang: error: no such file or directory: '$(BLDLIBRARY)'
   

   Reacted by Christoph Reiter
10. 48 remaining items
11. thunder-coding

    added 2 commits that reference this issue on Feb 20, 2026

    pythonGH-138800: fix variable substitution in python3.pc for Android

    dfd1070

    pythonGH-138800: fix variable substitution in python3.pc for Android

    8d4760a
12. thunder-coding

    added a commit that references this issue on Mar 6, 2026

    pythonGH-138800: fix variable substitution in python3.pc for Android

    480c0f1
13. lazka

    added 2 commits that reference this issue on Apr 10, 2026

    configure: Work around broken pc file

    113a1a6

    configure: Work around broken pc file

    b853df6
14. lazka

    added a commit that references this issue on May 11, 2026

    configure: Work around broken pc file

    af85ed4
15. lazka

    added a commit that references this issue on Jun 10, 2026

    configure: Work around broken pc file

    0378759
16. freakboy3742

    closed this as completedin #144776on Aug 3, 2026
17. freakboy3742

    added 2 commits that reference this issue on Aug 3, 2026

    GH-138800: Fix variable substitution in python3.pc for Android (#144776)

    5918085

    [3.15] GH-138800: Fix variable substitution in python3.pc for Android (…

    847d099
18. lazka commented on Aug 3, 2026

    

    lazka

    on Aug 3, 2026

    ContributorAuthor

    More actions

    Thanks @freakboy3742 @thunder-coding !
19. freakboy3742

    added 2 commits that reference this issue on Aug 3, 2026

    [3.14] GH-138800: Fix variable substitution in python3.pc for Android (…

    90be969

    [3.13] GH-138800: Fix variable substitution in python3.pc for Android (…

    df26596
20. deadlovelll

    added a commit that references this issue on Aug 5, 2026

    [3.14] pythonGH-138800: Fix variable substitution in python3.pc for A…

    a014e95
21. mbeijen

    added a commit that references this issue on Aug 14, 2026

    pythonGH-138800: Fix variable substitution in python3.pc for Android (p…

    9d2c7f6

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