Refine python3's SAGE_SPKG_DEPCHECK: bzip2, xz, libffi

[mkoeppe]

Currently we have SAGE_SPKG_DEPCHECK([sqlite libpng bzip2 xz libffi], ...), which causes system python3 to be rejected on many systems.

We should review whether this can be made more fine-grained.

SAGE_SPKG_DEPCHECK is specifically for checking whether we are going to install a shared library that may interfere with a system-provided version of the same shared library that the package is linked against.

Package sqlite - done in #30559

Package libpng is taken care of in #31009

Here we follow up to address the following dependencies:

Package bzip2......

$ grep bzip2 build/pkgs/*/dependencies
build/pkgs/cbc/dependencies:readline zlib bzip2 $(BLAS)
build/pkgs/cmake/dependencies:curl zlib bzip2 xz
build/pkgs/freetype/dependencies:libpng bzip2
build/pkgs/pcre/dependencies:bzip2
build/pkgs/python3/dependencies:zlib readline sqlite libpng bzip2 xz libffi
build/pkgs/r/dependencies:$(BLAS) gfortran iconv readline bzip2 xz pcre curl | pkgconf

Package xz represents both the shared library liblzma and the xz binary. #30948

Package libffi....

$ grep libffi build/pkgs/*/dependencies
build/pkgs/ecl/dependencies:$(MP_LIBRARY) readline gc libffi
build/pkgs/python3/dependencies:zlib readline sqlite libpng bzip2 xz libffi

See also:

• If system mpir is found, yasm should not be built #28019 If system mpir is found, yasm should not be built

Depends on #30948
Depends on #31009

CC: @jhpalmieri

Component: build: configure

Issue created by migration from https://trac.sagemath.org/ticket/30949

[mkoeppe]

Dependencies: #30948

[mkoeppe]

Changed dependencies from #30948 to #30948, #31009

[mkoeppe]

comment:3

Setting new milestone based on a cursory review of ticket status, priority, and last modification date.