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Khem Raj
53c0b99a78
posix_ipc decides at build time whether it needs librt and whether
message queues are available by compiling small probe programs in
build_support/discover_system_info.py. Its does_build_succeed() splices
the linker option into the compiler argv verbatim, so when no extra
library is wanted the compiler is called with a literal empty argument:
$CC -Wall -o foo foo.c '' -lpthread
GNU ld treats '' as an input file and fails ("cannot find : No such
file or directory"); lld ignores it. With the gcc toolchain every probe
without -lrt therefore fails, the prober wrongly decides librt is
required, and on a C library without a usable librt message queue
support is dropped - which is how posix_ipc.MessageQueue went missing
(issue #916). The result depends on the linker rather than on what the
C library provides.
The previous LDFLAGS += "-lrt" workaround only papered over this, and
is itself libc specific: it forces linking librt even where mq_* live
in libc (glibc >= 2.34, musl).
Fix the prober to split linker_options with shlex, like it already does
for CC, so an empty value adds no argument, and drop the forced -lrt so
the probes decide per C library.
Verified on qemux86-64 for glibc and musl, each with the clang and gcc
toolchains: src/system_info.h defines MESSAGE_QUEUE_SUPPORT_EXISTS,
SEM_GETVALUE_EXISTS and SEM_TIMEDWAIT_EXISTS, and the extension module
imports all mq_* from libc with no librt NEEDED entry.
Fixes: https://github.com/openembedded/meta-openembedded/issues/916
AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
11 lines
487 B
BlitzBasic
11 lines
487 B
BlitzBasic
DESCRIPTION = "POSIX IPC primitives (semaphores, shared memory and message queues) for Python"
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HOMEPAGE = "https://semanchuk.com/philip/posix_ipc/"
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SECTION = "devel/python"
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LICENSE = "BSD-3-Clause"
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LIC_FILES_CHKSUM = "file://LICENSE;md5=e3d8df223c2614dbf1aabdc1ca23cc10"
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SRC_URI += "file://0001-build_support-do-not-pass-empty-linker-option-to-the.patch"
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SRC_URI[sha256sum] = "6923232111329954a8349f7d99f212b6e96b5206e77fbd39aaf1b3cb4a5e9260"
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inherit pypi python_setuptools_build_meta
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