Libraries are tagged with LINKABLE_MORE_THAN_ONCE can be linked into more than
one shared library and not give an error.
RELNOTES:none
PiperOrigin-RevId: 297352891
Change-Id: Id32b5c341bfd9d5906d67216773e82b0d8b63faf
The --experimental_cc_shared_library used to block API methods
that were needed in the cc_shared_library implementation. However, these
methods have been made freely available to everyone so that people can start
migrating to the new API.
With that change, the cc_shared_library has become free to use unless we block
it with the method call added in this CL.
RELNOTES:none
PiperOrigin-RevId: 297127873
Change-Id: I103fe7724b9c4956a5bee8bed0f6d074a6e453f1
The same command line can be obtained with the attributes
user_link_flags and additional_linker_inputs used together.
In the first design iterations of cc_shared_library it was decided to have the
visibility_file attribute so that a cc_shared_library could be used for many
different platforms smoothly.
For this to work the visibility file would have had to be platform neutral and
then Bazel would have had to write a visibility file specific for each
platform, e.g. the version script for Unix and the exports map for Windows.
However, in the last approved design it was decided not to have Bazel get in
the business of understanding symbols and automatically writing export maps.
With this approach, it then became necessary for people to use selects() in the
visibility_file attribute depending on the platform that the file was for.
Since we have added a new way to add files with the attribute
additional_linker_inputs and we need selects() anyway,
it doesn't make sense to keep the visibility_file attribute, the
same can be achieved with selects in the other two attributes mentioned.
In any case, if this can be made more ergonomic in the future, we can do so.
However, removing this attribute after flipping the experimental flag would be
an incompatible change.
PiperOrigin-RevId: 295925566
Change-Id: I52733e006f4b0f79f50380e89fc2eeae58dbad4d
Before dynamic lib dependencies of cc_shared_library were always linked at the
end. Now for creating the command line we respect the topological order that
would be given when getting the libs from the dependency graph created by the
cc_libraries.
RELNOTES:none
PiperOrigin-RevId: 295676824
Change-Id: I327a0e10920f18fed234dd5835e54cab75a0d428
Any library should be exportable by any cc_shared_library target regardless of whether the cc_shared_library target is in the same package or a parent package as long as the library author gives permission.
The library author can now do this by writing tags=["exported_by=//foo,//baz"].
PiperOrigin-RevId: 295137965
Change-Id: I4acffd26981fedd6cb0c505e2691da0c70a7b6b0
For now we will restrict allowed exports to the same package. At the same time
static_deps should be used to take into account what should be linked into a
shared library.
RELNOTES:none
PiperOrigin-RevId: 294668451
Change-Id: Ia087519106983bfa9a980e471d3102ab391a53eb
This is in preparation to renaming linked_statically_by to exported_by. The attribute linked_statically_by became redundant in a previous CL that added the static_deps attribute and made libraries in exports be linked statically automatically.
RELNOTES:none
PiperOrigin-RevId: 293355106
Change-Id: Iac987087e2f8e280f0fcaa2b7fcf61c55542825b
This removes the need for linked_statically_by, although both attributes work for now. The attribute linked_statically_by will disappear from cc_library and instead we will add exported_by which will allow library authors to retain the power of deciding who exports their library.
When a library is linked statically by more than one shared library and this library was only supposed to be linked once, i.e. it contains static initializers, then Bazel will give an error.
PiperOrigin-RevId: 293319906
Change-Id: I3713511e09feffb9429d38ac3ae868498ed4afe6
linked_statically_by attribute in cc_library will have a nodep label type
instead of a string type.
RELNOTES:none
PiperOrigin-RevId: 289665470
Change-Id: Ic86f3cd0fecf1ad8befb21844c0d7176dc898934
When adding tags to a native cc_library rule that is created through a macro we
were not properly considering the case where the tags came from a different
file and therefore were frozen. This caused an error.
RELNOTES:none
PiperOrigin-RevId: 283039855
Change-Id: Id4cb45675a08ca65196f4f7771abdd5bb0705b79
Order of libraries should be topological sort when constructing depset for
LinkingContext.
Also remove condition that failed when it shouldn't with a valid combination of
libraries.
RELNOTES:none
PiperOrigin-RevId: 282943411
Change-Id: I0b727c4cdeaf484e1c4177a714542eae7f167613
We need @rules_cc in front of the toolchain type in cc_shared_library. This is
still experimental.
More complete test suite is on the way in a separate CL I'm working on.
RELNOTES:none
PiperOrigin-RevId: 282716323
Change-Id: I797ef08f18987adef82b7c7d484e2838f4e1ba6a
It used to propagate TransitiveInfoCollections for exports which is not ideal.
RELNOTES:none
PiperOrigin-RevId: 281056556
Change-Id: I2ec39292aefb55369720fbbb93ee1e2f8704b8db
We use BUILD example added in previous CL and inspect the resulting *.so files with nm.
Also fixes implementation of shared library to work with Bazel after having flipped the legacy whole archive flag. This caused exported libraries to be dropped by the linker unless they were alwayslink.
Still more tests to come.
RELNOTES:none
PiperOrigin-RevId: 280640226
Change-Id: I34b48ce7379536352f87b703580083eb85ca67b3
This is only tested with Bazel at head. We modify the presubmits file so that we don't use release. The reason we don't use release is because we need very recent changes to Bazel to test cc_shared_library. In the future we will also test with release.
Also in following CLs, we will inspect in integration test the *.so output from these example builds to make sure that the correct symbols are linked statically and are visible.
After that we will add Starlark unit test to check error conditions.
RELNOTES:none
PiperOrigin-RevId: 280381939
Change-Id: I5de9b364a2a3db28d99558fbfca7bea8052e5114
Add an explicit export statement (with the same visibility) for
files that are currently only implicitly exported and used by other
pacakges. This prepares changing the visibility of implicitly-exported
files to be package private without causing a breakage.
PiperOrigin-RevId: 280171386
Change-Id: I083a9d4f82067b4d4c94d7b554013aeb91e401cc
We're working on removing C++ toolchain autoconfiguration logic out of Bazel,
and moving towards using rules_cc repository for it. Some bzl files will no
longer be available through bazel/tools/cpp/*, but through
@rules_cc/cc/*.
RELNOTES: None.
PiperOrigin-RevId: 279935457
Change-Id: I3bae259548dacc5c6789efe0f27dd07738c1057c
Labels in toolchains attribute need to include the repository, otherwise the resolution won't work.
RELNOTES: None.
PiperOrigin-RevId: 279347045
Change-Id: Iba1eb8bb677771e2c089ab6bc1b5e019c4da434e
Fixes:
* Enabled buildifier on the Bazel CI again
* Added Skydocs where missing
* Moved public files out of .../private/... (e.g. cc_toolchain_config_lib.bzl)
* Reformatted
* Removed unused loads
* Using relative labels for cc_configure related files
* Added development dependency on rules_proto
* they're not in the federation yet, so hand rolling in rules_cc's WORKSPACE file
* Added development dependency on rules_python (from federation)
* Cleaned up copybara (notable change - not using @rules_cc in labels inside rules_cc repo)
* Made cc_flags_supplier usable internally
* Moved load statements to the top of the bzl file
* Moved runfiles to the tools directory
* Unified toolchain_utils.bzl and find_cc_toolchain.bzl
RELNOTES: None.
PiperOrigin-RevId: 276479521
Change-Id: I3196896061fa2ee61a3efb130c214d288782066a
Googler