STINNER Victor <[email protected]> added the comment:
To come back to RPATH vs RUNPATH: these 2 are very different in term of
priorities in search (see other comments).
distutils uses an heuristic to opt-in for RUNPATH using GNU ld
--enable-new-dtags option. This option is only used if the following 3
conditions are met:
(1) the OS is not macOS, not FreeBSD, nor HP-UX
(2) the C compiler is detected as GCC
(3) Python detected the linker as being GNU ld
Problem: the heuristic is not very reliable:
(3) only checks the linker when Python is build, it's implemented as:
sysconfig.get_config_var("GNULD") == "yes". In practice, the linker can be
changed at runtime using environment variables and so Python may miss the
oportunity for opt-in for --enable-new-dtags, or pass this option which is
unknown to another linker.
(2) The detection of GCC checks for "gcc" or "g++" string if the name of the
compiler program name. If you use "cc", it's not detected as GCC.
I'm not sure that these 2 problems are real problems "in practice".
My main concern is that you might get RPATH or RUNPATH depending on operating
system, the C compiler and the linker, whereas RPATH semantics is very
different from RUNPATH semantics (search priority).
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<https://bugs.python.org/issue36659>
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