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* Bazel now can build dynamic library from cc_libraryGravatar Yun Peng2017-09-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Automated rollback of commit ca216f5eb4b1f1892219db0f578495bbbdbaa875.Gravatar philwo2017-09-15
| | | | | | | | | | | | | | | *** 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
* Introduce empty "toolchain_category" rule for labels that will be used asGravatar cpeyser2017-09-14
| | | | | | | | 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
* Automated rollback of commit 2b983bdf508e010a3d4ee9dbaf446b7666749799.Gravatar cpeyser2017-09-01
| | | | | | | | | | | | *** 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
* Rollforward of c++ toolchain-relevant BUILD file and Bazel mocking changes. ↵Gravatar cpeyser2017-08-31
| | | | | | That is, a c++ toolchain is added, but a Bazel dependency on that toolchain is not. PiperOrigin-RevId: 167006332
* Automated rollback of commit 9d5bce66280094c0531ddfde2752e596d0d78c79.Gravatar plf2017-08-30
| | | | PiperOrigin-RevId: 166966182
* Add a new toolchain type for c++. In order to do this, ↵Gravatar cpeyser2017-08-29
| | | | | | | | 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
* Automated rollback of commit 363413110f3a63a11d900864be1852adbaed2899.Gravatar cpeyser2017-08-29
| | | | | | | | | | | | | | | | | | | | | | | | | | *** 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
* Add a new toolchain type for c++. In order to do this, ↵Gravatar cpeyser2017-08-28
| | | | | | | | 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
* Update javac version to 9-dev-r4023-3Gravatar Liam Miller-Cushon2017-08-22
| | | | | Change-Id: If9373f81193050009432759da6299f1382e587ec PiperOrigin-RevId: 165994437
* Extract a library from create_embedded_tools.pyGravatar László Csomor2017-08-11
| | | | | | | | | We'll use the extracted functions in the upcoming Python-based reincarnation of the //:bazel-distfile rule. Change-Id: I5140938ae4af50f62fb695b5b96cd41f3cd939ef PiperOrigin-RevId: 164950515
* Make create_embedded_tools.py python 2.6 friendlyGravatar hlopko2017-08-09
| | | | | | | | 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
* Replace create_embedded_tools.sh with a faster Python version.Gravatar Philipp Wollermann2017-07-28
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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