Commits ca1afcb217 (package/ply: needs headers >= 4.14) and
debe9eb13e (package/ply: needs dynamic library) added restrictions
on the availability of ply. The first forgot to add a comment, and
the second mis-handled the dependency on the headers version.
Indeed, we want the comment to show the requirement on the headers
version (since that is not a hardware dependency).
Fix this comment to include the headers version, and fix the condition
accordingly.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Andreas Klinger <ak@it-klinger.de>
ply builds and installs a library. Some objects that go in that library
are tagged with a 'section' attribute (excerpt):
__attribute__((section("providers")))
Later on, it references the bounds of that section, with the canonical
__start and __stop markers, which will eventually be created by the
linker:
extern struct provider __start_providers;
extern struct provider __stop_providers;
Sections only exists in an ELF file, and a static library id not an ELF.
So, when creating a static library, the markers are not created. Thus,
when linking the final executable, the link fails because of missing
symbols:
.../powerpc-buildroot-linux-uclibc/bin/ld: ../libply/.libs/libply.a(libply_la-provider.o): in function `provider_get':
provider.c:(.text+0xe): undefined reference to `__start_providers'
.../powerpc-buildroot-linux-uclibc/bin/ld: provider.c:(.text+0x12): undefined reference to `__stop_providers'
.../powerpc-buildroot-linux-uclibc/bin/ld: provider.c:(.text+0x2a): undefined reference to `__start_providers'
.../powerpc-buildroot-linux-uclibc/bin/ld: provider.c:(.text+0x32): undefined reference to `__stop_providers'
So, conceptually, ply can not build in static-only.
Fixes:
- http://autobuild.buildroot.net/results/3a586241d37614b644ff6c4674ae28df2b22fdf8
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
ply is a light-weight dynamic tracer for Linux. By means of using the
BPF it can attach probes to the linux kernel (e. g. kprobes).
It's a small alternative to LLVM based tracers for embedded systems.
Project page:
https://github.com/wkz/ply/releases
Documentation can be found here:
https://wkz.github.io/ply/
Tested with beaglebone_defconfig (uClibc-ng as well as glibc)
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
