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package/ply: needs dynamic library

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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>
This commit is contained in:
Andreas Klinger 2021-02-13 20:05:23 +01:00 committed by Yann E. MORIN
parent 15fc28a79f
commit debe9eb13e
1 changed files with 7 additions and 0 deletions
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7
package/ply/Config.in
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@ -5,11 +5,18 @@ config BR2_PACKAGE_PLY_ARCH_SUPPORTS
default y if BR2_powerpc
default y if BR2_x86_64
comment "ply needs a toolchain w/ dynamic library"
depends on BR2_PACKAGE_PLY_ARCH_SUPPORTS
depends on BR2_USE_MMU
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14 # BPF_JLT
depends on BR2_STATIC_LIBS
config BR2_PACKAGE_PLY
bool "ply"
depends on BR2_PACKAGE_PLY_ARCH_SUPPORTS
depends on BR2_USE_MMU # fork()
depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14 # BPF_JLT
depends on !BR2_STATIC_LIBS
help
ply is a light-weight dynamic tracer for Linux. By means of
using the BPF it can attach probes to the linux kernel