| Commit message (Collapse) | Author | Age |
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Working towards: https://github.com/bazelbuild/bazel/issues/3311
When building dynamic library on Windows, Bazel builds an import library
and a DLL.
Bazel provides a feature called windows_export_all_symbols, if this
feature is enabled(and no_windows_export_all_symbols is not) for a
cc_library, then Bazel parses object files of that cc_library to generate
a DEF file that will be used during linking time to export symbols from
DLL. This feature can be specified at crosstool, package, target and
command line level.
A few differences from Unix platforms:
1. We don't build the shared library on Windows by default, users have to
specifiy --output_groups=dynamic_library for building dynamic libraries.
This output group is also available on other platforms.
2. By default, cc_test is dynamically linked on Unix, but it will be
statically linked on Windows by default. (meaning the default value of
linkstatic in cc_test is 1 on Windows, and 0 on other platforms)
3. For global data symbols, __declspec(dllimport) must still be used in
source files.
Remaining issues:
1. Extensions for import library and DLL are not correct yet.
2. DLLs are not guaranteed to be available during runtime yet.
3. Diamond problem
If a cc_library A is specified as linkstatic=0, then no dynamic library
will be built for it, so if another cc_library B depends on it, A will
be statically linked into B, and if a cc_binary C depends on B, A will
also be statically linked into C and B will be dynamically linked to C.
This is wrong because A is duplicated in both B and C.
It is essentially a diamond problem describled in C++ Transitive Library.
(https://docs.google.com/document/d/1-tv0_79zGyBoDmaP_pYWaBVUwHUteLpAs90_rUl-VY8/edit?usp=sharing)
Hopefully, we can avoid this by using cc_shared_library rule in future.
Change-Id: I23640d4caf8afe65d60b1522af6368536d7a8408
PiperOrigin-RevId: 168829958
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*** Reason for rollback ***
Breaks Bazel building itself on FreeBSD, also #3739.
*** Original change description ***
Introduce empty "toolchain_category" rule for labels that will be used as
categories of toolchains for the purpose of toolchain selection.
Up to now, we've used the native toolchain_type rule for this purpose. That rule depends on a number of configuration fragments that supply build variables - we don't want toolchains to need to depend on those fragments as well. E.g. toolchain_type depends on JvmConfiguration, but we would like toolchains to work with --experimental_disable_jvm.
PiperOrigin-RevId: 168810566
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categories of toolchains for the purpose of toolchain selection.
Up to now, we've used the native toolchain_type rule for this purpose. That rule depends on a number of configuration fragments that supply build variables - we don't want toolchains to need to depend on those fragments as well. E.g. toolchain_type depends on JvmConfiguration, but we would like toolchains to work with --experimental_disable_jvm.
PiperOrigin-RevId: 168577759
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*** Reason for rollback ***
Breaks rules_go CI
*** Original change description ***
Rollforward of c++ toolchain-relevant BUILD file and Bazel mocking changes. That is, a c++ toolchain is added, but a Bazel dependency on that toolchain is not.
PiperOrigin-RevId: 167198874
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That is, a c++ toolchain is added, but a Bazel dependency on that toolchain is not.
PiperOrigin-RevId: 167006332
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PiperOrigin-RevId: 166966182
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PlatformConfiguration is made a legal configuration fragment for every rule class.
Add a default "dummy" c++ toolchain to prevent resolution errors when legacy toolchain selection logic is used. Add toolchain mocks to java and shell tests.
PiperOrigin-RevId: 166854893
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*** Reason for rollback ***
Breaks //src/test/shell/bazel:bazel_bootstrap_distfile_test:
INFO: You can skip this first step by providing a path to the bazel binary as second argument:
INFO: ./compile.sh compile /path/to/bazel
🍃 Building Bazel from scratch......
🍃 Building Bazel with Bazel.
.WARNING: /tmp/bazel_cHivhPBc/out/external/bazel_tools/WORKSPACE:1: Workspace name in /tmp/bazel_cHivhPBc/out/external/bazel_tools/WORKSPACE (@io_bazel) does not match the name given in the repository's definition (@bazel_tools); this will cause a build error in future versions.
ERROR: in target '//external:cc_toolchain': error loading package '@local_config_cc//': Extension file not found. Unable to load file '@local_config_cc//:dummy_toolchain.bzl': file doesn't exist or isn't a file.
INFO: Elapsed time: 3.343s
ERROR: Could not build Bazel
Found by git bisect.
*** Original change description ***
Add a new toolchain type for c++. In order to do this, PlatformConfiguration is made a legal configuration fragment for every rule class.
Add a default "dummy" c++ toolchain to prevent resolution errors when legacy toolchain selection logic is used. Add toolchain mocks to java and shell tests.
PiperOrigin-RevId: 166750885
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PlatformConfiguration is made a legal configuration fragment for every rule class.
Add a default "dummy" c++ toolchain to prevent resolution errors when legacy toolchain selection logic is used. Add toolchain mocks to java and shell tests.
PiperOrigin-RevId: 166509298
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Change-Id: If9373f81193050009432759da6299f1382e587ec
PiperOrigin-RevId: 165994437
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We'll use the extracted functions in the upcoming
Python-based reincarnation of the
//:bazel-distfile rule.
Change-Id: I5140938ae4af50f62fb695b5b96cd41f3cd939ef
PiperOrigin-RevId: 164950515
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Centos 6.7 provides only python 2.6. And since we test bazel with this version,
let's replace the only python 2.7 use with the python 2.6 friendly code.
RELNOTES: None.
PiperOrigin-RevId: 164704194
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This is functionally equivalent, but ~30x faster on Windows, ~2x faster on macOS and ~1.5x faster on Linux.
RELNOTES: None.
Change-Id: Ib4a7e10400a3955e47772425acfce2d9530de462
PiperOrigin-RevId: 163346634
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