I'll explain in more details what the problem is and why this patch is
correct, given the current status of abseil-cpp recipe.
In protobuf's abseil-cpp.cmake file, there's a hardcoded list of absl
targets used by protobuf:
https://github.com/protocolbuffers/protobuf/blob/main/cmake/abseil-cpp.cmake#L56
This value in turn is parsed and used to replace the
@_protobuf_PC_REQUIRES@ in protobuf.pc.cmake.
Here's the generated probobuf.pc file's contents:
"""
$ cat ../build/protobuf.pc
prefix=/usr
exec_prefix=/usr
libdir=/usr/lib64
includedir=/usr/include
Name: Protocol Buffers
Description: Google's Data Interchange Format
Version: 25.3.0
Requires: absl_absl_check absl_absl_log absl_algorithm absl_base
absl_bind_front absl_bits absl_btree absl_cleanup absl_cord
absl_core_headers absl_debugging absl_die_if_null
absl_dynamic_annotations absl_flags absl_flat_hash_map
absl_flat_hash_set absl_function_ref absl_hash absl_layout
absl_log_initialize absl_log_severity absl_memory absl_node_hash_map
absl_node_hash_set absl_optional absl_span absl_status absl_statusor
absl_strings absl_synchronization absl_time absl_type_traits
absl_utility absl_variant utf8_range
Libs: -L${libdir} -lprotobuf
Cflags: -I${includedir} -DPROTOBUF_USE_DLLS
Conflicts: protobuf-lite
"""
Let me use "absl_hash" and "absl_absl_log" in the above list as examples.
"""
$ find ../../../abseil-cpp/20240116.2/packa
ges-split/ -name "libabsl_hash.so.*"
../../../abseil-cpp/20240116.2/packages-split/libabsl-hash/usr/lib64/libabsl_hash.so.2401.0.0
../../../abseil-cpp/20240116.2/packages-split/abseil-cpp-dbg/usr/lib64/.debug/libabsl_hash.so.2401.0.0
$ find ../../../abseil-cpp/20240116.2/packa
ges-split/ -name "libabsl_absl_log.so.*"
$
"""
See? The current package splitting of abseil-cpp does not match what
protobuf assumes. And I thinks protobuf's assumption is correct, because
there's really a absl_absl_log.pc file generated by abseil-cpp.
And there's the contents and location of absl_absl_log.pc:
"""
$ cat
../../../abseil-cpp/20240116.2/packages-split/abseil-cpp-dev/usr/lib64/pkgconfig/absl_absl_log.pc
prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib64
includedir=/usr/include
Name: absl_absl_log
Description: Abseil absl_log library
URL: https://abseil.io/
Version: 20240116
Requires: absl_log_internal_log_impl = 20240116
Libs: -L${libdir}
Cflags: -I${includedir} -DNOMINMAX
"""
And there's the contents for the absl_log_internal_log_impl:
"""
$ cat ../../../abseil-cpp/20240116.2/packag
es-split/abseil-cpp-dev/usr/lib64/pkgconfig/absl_log_internal_log_impl.pc
prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib64
includedir=/usr/include
Name: absl_log_internal_log_impl
Description: Abseil log_internal_log_impl library
URL: https://abseil.io/
Version: 20240116
Requires: absl_log_internal_conditions = 20240116,
absl_log_internal_message = 20240116, absl_log_internal_strip =
20240116, absl_absl_vlog_is_on = 20240116
Libs: -L${libdir}
Cflags: -I${includedir} -DNOMINMAX
"""
We can then find the absl_log_internal_conditions library:
"""
$ find ../../../abseil-cpp/20240116.2/packages-split/ -name
"*absl_log_internal_message*"
../../../abseil-cpp/20240116.2/packages-split/libabsl-log-internal-message/usr/lib64/libabsl_log_internal_message.so.2401.0.0
../../../abseil-cpp/20240116.2/packages-split/abseil-cpp-dev/usr/lib64/libabsl_log_internal_message.so
../../../abseil-cpp/20240116.2/packages-split/abseil-cpp-dev/usr/lib64/pkgconfig/absl_log_internal_message.pc
../../../abseil-cpp/20240116.2/packages-split/abseil-cpp-dbg/usr/lib64/.debug/libabsl_log_internal_message.so.2401.0.0
"""
What does all above mean? It means that abseil-cpp is not splitted
reasonably. This could be proven by the absl_absl_log.pc file as
described above.
So, given the current situation of abseil-cpp, Yi's solution is correct.
Before abseil-cpp is re-splitted according to its pc files, which then
could possibly lead to automatic parsing of the protobuf.pc file to add
extra RDEPENDS automatically in protobuf recipe, we need to have Yi's
solution. And we need to use RDEEPNDS instead of RRECOMMENDS (see the
'Requires' directive in corresponding .pc files).
Regards,
Qi
On 10/1/24 20:42, Peter Marko via lists.openembedded.org wrote:
-----Original Message-----
From: [email protected] <openembedded-
[email protected]> On Behalf Of Peter Kjellerstedt via
lists.openembedded.org
Sent: Tuesday, October 1, 2024 14:00
To: Yi Zhao <[email protected]>; Yi Zhao <[email protected]>
Cc: [email protected]
Subject: Re: [oe] [meta-oe][PATCH 1/2] protobuf: add abseil-cpp to
RDEPENDS
-----Original Message-----
From: Yi Zhao <[email protected]>
Sent: den 25 september 2024 04:17
To: Peter Kjellerstedt <[email protected]>; Yi Zhao
<[email protected]>
Cc: [email protected]
Subject: Re: [oe] [meta-oe][PATCH 1/2] protobuf: add abseil-cpp to
RDEPENDS
On 9/24/24 03:02, Peter Kjellerstedt wrote:
-----Original Message-----
From: [email protected] <openembedded-
[email protected]> On Behalf Of Yi Zhao
Sent: den 22 september 2024 09:36
To: [email protected]
Subject: [oe] [meta-oe][PATCH 1/2] protobuf: add abseil-cpp to
RDEPENDS
Since commit[1], the libraries of abseil-cpp have been splitted into
separate packages. When protobuf is installed into the image, only 48
abseil libraries are installed as runtime dependencies. But the output
of 'pkg-config --libs protobuf' lists 66 abseil-cpp libraries are
required. Add abseil-cpp to RDEPENDS to ensure that all required
abseil-cpp libraries are installed.
[1] https://git.openembedded.org/meta-
openembedded/commit/?id=dd6421e65eb75c35a904f4b487ba022075035
ecc
Signed-off-by: Yi Zhao <[email protected]>
---
meta-oe/recipes-devtools/protobuf/protobuf_4.25.4.bb | 2 ++
1 file changed, 2 insertions(+)
diff --git a/meta-oe/recipes-devtools/protobuf/protobuf_4.25.4.bb
b/meta-oe/recipes-devtools/protobuf/protobuf_4.25.4.bb
index cc5204de4..354b3213a 100644
--- a/meta-oe/recipes-devtools/protobuf/protobuf_4.25.4.bb
+++ b/meta-oe/recipes-devtools/protobuf/protobuf_4.25.4.bb
@@ -106,6 +106,8 @@ FILES:${PN}-lite = "${libdir}/libprotobuf-
lite${SOLIBS}"
# CMake requires protoc binary to exist in sysroot, even if it has wrong
architecture.
SYSROOT_DIRS += "${bindir}"
+RDEPENDS:${PN} = "abseil-cpp"
+RDEPENDS:${PN}-lite = "abseil-cpp"
This defeats the whole purpose of splitting up the abseil
libraries. What triggered this change? Was it an actual
runtime error, or were you only looking at the output
from pkg-config --libs protobuf?
Since the .pc files are in the protobuf-dev package, which
depends on the abseil-cpp-dev package, all abseil libraries
should be available if you are actually building on target
or with an SDK.
Our customer reported this issue. Here is his description:
The abseil libraries will be included in the SDK, but not on the target.
The application is building with SDK. The yocto build is adding protobuf
to the image (no explicit abseil libraries are added). If an application
then are built using the SDK it can not be executed on target as
libraries are missing.
Can we at least change the dependency to a recommendation so
that it can be avoided via BAD_RECOMMENDATIONS? Because as it
is, it penalizes everyone that use protobuf for the case where
one provides an SDK with protobuf.
My suggestion would be to change it to:
# Recommend abseil-cpp so that all its libraries are installed in case
# protobuf is provided as part of an SDK. Everyone else should add
# BAD_RECOMMENDATIONS += "abseil-cpp" to their configuration.
RRECOMMENDS:${PN} = "abseil-cpp"
RRECOMMENDS:${PN}-lite = "abseil-cpp"
I think that's also not the right way to do this.
Adding unnecessary stuff to release images to satisfy SDK needs is wrong.
I also wonder if the problem is not at the SDK level.
If you build an sdk, there is explicitly installed package base and additional
required dependencies of those packages.
The dependencies may not be complete and fully usable, only their parts
sufficient for the explicitly installed stuff is present.
Are the sdk users assuming that full abseil-cpp is installed and thus using
also parts not needed for protobuf?
The proper solution would be probably to include abseil-cpp explicitly in SDK
used in that way.
Peter
//Yi
RDEPENDS:${PN}-compiler = "${PN}"
RDEPENDS:${PN}-dev += "${PN}-compiler"
RDEPENDS:${PN}-ptest = "bash
${@bb.utils.contains('PACKAGECONFIG', 'python', 'python3-protobuf', '', d)}"
--
2.25.1
//Peter
//Peter
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