[Buildroot] [git commit] package/ply: needs dynamic library
Yann E. MORIN
yann.morin.1998 at free.fr
Sat Feb 13 21:33:40 UTC 2021
commit: https://git.buildroot.net/buildroot/commit/?id=debe9eb13ebd8b8d5596832030ec61032bdc99b3
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
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 at it-klinger.de>
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
package/ply/Config.in | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/package/ply/Config.in b/package/ply/Config.in
index 35c2dc9bfc..16f5f8a267 100644
--- a/package/ply/Config.in
+++ b/package/ply/Config.in
@@ -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
More information about the buildroot
mailing list