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Bazel Include External Headers, If you How to include a header file in Bazel? In your case, the header file func. Adding these to headers doesn't work {% include "_buttons. WANT: I'd like bazel to provide some supported mechanism to let users compile their own code different warnings flags than their dependencies. So I fix the header file problem. bazel system I am working on a c++ project with bazel BUILD system in the vscode IDE environment. a file for me to call cc_import. Other dependencies that don't use includes are not affected, including some native bazel dependencies The layering_check feature enforces that targets only include headers provided by their direct dependencies. yaml Common C++ Build Use Cases {% include “_buttons. h, which is specified in the hdrs attribute. (current directory) or . catch2, as will see below). h from being Description of the bug: Enabling the feature external_include_paths changes the directories specified by the "includes" attribute of cc_library from using /I flag to using /external:I flag. bazel-demo/ ├── src │ ├── BUILD │ Description of the bug: I'm trying to port into bazel a cc library. For a language details and --output flag details, please see the reference manuals, Bazel When I try to build the same tree with Bazel I am unable to successfully include the header file hellomake. cc and . My project Using cc_library, I can include <boost/lexical_cast. hpp feature1. Sometimes, the same dependency might be used via different repository names (for example, both @io_bazel_skylib and We put symlinks “bazel-<workspace-name>”, “bazel-out”, “bazel-testlogs”, and “bazel-bin” in the workspace directory; these symlinks points to some directories inside a target-specific directory Avoid using UNIX directory shortcuts, such as . If a file includes a header, then the file‘s rule should depend on that header’s library. You can use the bazel clean command to delete these folders and start a fresh build. However, bazel allows the execution So the issue with the flow I'm using is that I'm generating an archive library and some header files using an external tool flow, in this case Verilator. html” %} Here you will find some of the most common use cases for building C++ projects with Bazel. For example, they could be a ruleset hosted in a GitHub repo, a Maven I'm testing bazel and now have a problem with external library. How can you control Bazel task execution orders? This page covers how to get started using Bazel's query language to trace dependencies in your code. If the external library uses the includes parameter to specify the include Can you include header files in header files? Yes, this will work. i wish to link my c++ Bazel supports external dependencies, source files (both text and binary) used in your build that are not from your workspace. hpp in genfiles (or bazel-bin), and I can get the initial library rule to include it, but I can't seem to figure out how to make my cc_binary rule, which Include paths Follow these guidelines for include paths: Make all include paths relative to the workspace directory. It does so by collecting all the needed external dependencies in an internal distdir_tar. So B and C here contain @László I want to make the build hermetic by making the system headers come from an external repository, not from whatever is installed in /usr/include. c failed: undeclared inclusion(s) in rule '//:main': 'part_A/hal_regs. Background: I have a header file which includes the Eigen library as so: #include External project names must be valid workspace names. gz demonstrates the first case where you end up with a private header from a dependency. Using transitive includes If a file includes a header, Pigweed Blog #9: Satisfying Bazel’s relative paths requirement in C++ toolchains # Published on 2025-11-05 by Armando Montanez Today’s blog post is an instructive, technical deep Headers in srcs must only be directly included from the files in hdrs and srcs of the library itself. c tries to include hal_regs. cpp bazel-include-repro-1. Bazel itself uses this technique to Headers in srcs must only be directly included from the files in hdrs and srcs of the library itself. Obviously, an up-level references, '. html" %} Here you will find some of the most common use cases for building C++ projects with Bazel. When deciding whether to put a header into hdrs or srcs, you should ask whether you want Description of the problem / feature request: I'm trying to port to bazel a library. It also used some third-party libraries which are also build from bazel (from source). To illustrate, one could take one of the large open source projects such as tensorflow. h files it finds in the same directory as the BUILD file that contains this target (excluding subdirectories). In your case func. . Caching of external dependencies Bazel caches external dependencies and re-downloads or updates them when the Using bzlmod, I'm looking to integrate an external dependency that provides the prebuilt . The headers are included both using double quotes An external repository is a directory tree, containing source files usable in a Bazel build, which is generated on demand by running its corresponding repo rule. The problem is that cc_import unaccountably does not support the includes attribute that cc_library does so you can't just name an include directory. The issue here is, the external library is dynamic and we can We never (almost never) require a directory to be on the include path for both workspace tree and bazel-out tree. c file. It covers practical Manage external dependencies in a Bazel project # Bazel is both a build system, and a package manager. For example, they could be a ruleset hosted in a GitHub repo, a Hmm, the tricky part about including headers from another places is that you have to specify the header file from its relative location according to the workspace (where the WORKSPACE Project: /_project. pardon me for asking it again here. tar. Adding external library support becomes a “pin point” in the Bazel project, especially when most of the third party software supports CMake but not Bazel. 1 new_local_repository is a function that can be used in WORKSPACE files, Found another way - I am now using a genrule to include the config header at the beginning of each . Bazel will then the hdrs from //barpath:bar to Dependencies on non-Bazel projects Dependencies on external packages Depending on other Bazel projects If you want to use targets from a second Bazel project, you can use local_repository, Can I create a cc_library target that only includes the necessary header file? And if so, how? Otherwise if I added a dependency for an existing cc_library that exposed include/build. The headers are included both In other words, Bazel sets the workspace root with -iquote as path for the compiler to search for headers. g. h>) also internally. Make the . If you have not done so already, get started with building C++ projects with Bazel by External project names must be valid workspace names. All header files in such dependencies In Bazel, every external dependency has a repository name. Verilator spits out the archive and Bazel: how to glob headers into one include path Asked 7 years, 11 months ago Modified 7 years, 11 months ago Viewed 4k times This works but as per Bazel C++ documentation, it is not recommended to have interface/public headers in srcs. 0, there are two ways to manage external dependencies with Bazel: the traditional, repository-focused WORKSPACE system, and the newer module-focused MODULE. h>) internally. This page Now, when I try to include the external library's header file, the build is failing as that header file is containing the warnings. However, when we generate compile_commands. Repos can be defined in a Adding build --features=external_include_paths in bazelrc breaks dependencies that uses includes in their cc_library s (e. If you have not done so already, get started with building C++ projects with Bazel by completing the tutorial Add a way of including private headers (ie, headers included by files in srcs that should not be available to targets that depend on this cc_library) that works the same when the cc_library is Project: /_project. bazel How should I version a Bazel module? Setting version with the module To use local files in Bazel, one can use new_local_repository. When deciding whether to put a header into hdrs or srcs, you should ask whether you want I am new to Bazel, but I want to release a library to other with headers and shared library. So, use the standard computer science workaround of If a file includes a header, then the file‘s rule should depend on that header’s library. We have an abstraction layer for the different ecu platforms and the different AL implementations are handled elsewhere so we would like to include Returns the list of modular headers that are declared by this target. h. I have it generating the output file version. When deciding whether to put a header into hdrs or srcs, you should ask whether you want Here you will find some of the most common use cases for building C++ projects with Bazel. h") for non-system headers, not angle-brackets got to have very basic solution to my problem, but i spent many hours and still struggling. h which has a relative path from the package libs/foo as include/foo/func. Those should be part of hdrs. This includes both public headers (such as those listed in "hdrs") and private headers (such as those listed in "srcs"). The default toolchain supports this feature on Linux with clang as the compiler. While the Bazel itself uses this technique to bootstrap offline from the distribution artifact. I am new to Bazel. Use quoted includes (#include "foo/bar/baz. (parent directory). h/. Depending on non-Bazel projects Rules prefixed with new_, such as new_local_repository, allow you to create targets from projects When using a custom toolchain, bazel considers including dependencies from an external package as using absolute paths #24930 If the source file main. For legacy or third_party code that requires includes pointing outside the project repository, such as external Since it is "external" to API library lib_b, it should not have access to internal library lib_a 's headers, namely alpha. hpp>, because it is in /usr/include. Bazel supports external dependencies, source files (both text and binary) used in your build that are not from your workspace. yaml Book: /_book. html” %} {# disableFinding (“repo”) #} Bazel supports external dependencies, source files (both text and Members defines direct_headers direct_private_headers direct_public_headers direct_textual_headers external_includes framework_includes headers includes local_defines Why is bazel not picking up my header from external? Asked 7 years, 2 months ago Modified 7 years, 2 months ago Viewed 449 times For legacy or third_party code that requires includes pointing outside the project repository, such as external repository includes requiring a prefix, use the include_prefix and strip_include_prefix External project names must be valid workspace names. I have a project which is built with Bazel. By providing a hash sum of the file needed, Bazel looks for a file matching the basename of the first URL, and uses the local copy if the hash matches. ', does not work. You can work around this by adding includes. My demo project is like this: a simple main. h lives outside the package defined by the BUILD file, that is limited to demo/src (and sub Is this possible in bazel? The end goal is to have a global config header file that I can configure (#ifdef FOO) based on the location of the sources that include it. If you have not done so already, get started with building C++ projects with Bazel hedronvision / bazel-compile-commands-extractor Public Notifications You must be signed in to change notification settings Fork 188 Star 899 The server implementation needs to support the new http_header_url:<url-index>:<header-key> qualifier where the <url-index> is a 0-based position of the URL inside the FetchBlobRequest's uris field. They show only use of cc_library in case A symbol that is autoloaded within a file behaves as if its built-into-Bazel definition were replaced by its canonical new definition in an external repository. h, this Bazel is the open source variant of Google’s internal Blaze build system. h provided by the HAL, bazel complains with Compiling main. To incorporate external dependencies with foreign build system in Bazel, you must use the rules_foreign_cc, from a cmake point of view I would say it is a bit akin to CMake's The sample project for this tutorial is in the examples/query-quickstart directory. Depending on non-Bazel projects Rules prefixed with new_, such as new_local_repository, allow you to create targets from projects that do When using cc_library in Bazel, the includes parameter specifies the directories to be add as -isystem dependencies. cpp are in the same directory as With this target, Bazel will build all the . Depending on non-Bazel projects Rules prefixed with new_, such as new_local_repository, allow you to create targets from projects that do The reason why is because strip_include_prefix generates extra symlinks on the filesystem in the virtual includes directory. This page answers some frequently asked questions about external dependencies in Bazel. It aims to provide fast and deterministic build/test, scaling to extremely By default in Bazel labels are not allowed to cross the package boundaries. bazel-include-repro Third-Party Library Integration Relevant source files This document demonstrates how to integrate popular third-party C/C++ libraries with Bazel using rules_foreign_cc. Note, however, that if you include a lot of headers in this file and don't need all of them in each of your source files, it will likely increase your Thanks Vertexwahn - all these seems like unnessary overwhelming to just use a 3rd party library from bazel, I was expecting something similar to: g++ -I /path/to/precompiled/include -L As of Bazel 6. h' (assuming a Headers in srcs must only be directly included from the files in hdrs and srcs of the library itself. But I'd also like to include its headers, I just don't want to build it Bazel supports external dependencies, source files (both text and binary) used in your build that are not from your workspace. Now, is there a way to prevent the include path of alpha. This combination is extremely powerful, but does introduce some complexity. h and foo_test. The library uses system includes (say #include <dir/foo. My code tree looks likes this (but with more subdirectories): root feature1 feature1. json files, we note that the Alternate to "`--whole-archive`" in bazel [Reason] It is because that the external library source files contains duplicate header files. #include "foo. I am now trying to export my project as a How often does it happen in practice that multiple headers are included in different directories? I assumed the common case is all headers are together in a single (or 2) directories Now, when I try to include the external library's header file, the build is failing as that header file is containing the warnings. I have a problem to figure it out by myself based on offical bazel tutorials, some presentations or similar questions I saw on the internet. For example, they could be a ruleset hosted in a GitHub repo, a Here you will find some of the most common use cases for building C++ projects with Bazel. a again. So in this case I would simply add includes = In my project, I am using the make rule to compile an external static library with a Makefile. Getting started What are Bazel queries? Queries help you to learn The symlinks for “bazel-<workspace-name>”, “bazel-out”, “bazel-testlogs”, and “bazel-bin” are put in the workspace directory; these symlinks point to some directories inside a target-specific directory inside Bazel query how-to This is a quick tutorial to get you started using Bazel's query language to trace dependencies in your code. Both projects use Bazel, so you can add your coworker’s project as an external dependency and then use any targets your coworker has defined from your own BUILD files. In this blog, I will how to add external In the cc_library how do I specify hdrs and includes when the path is outside the package? Problem: I'm struggling to build against an external dependency included with angle brackets. yaml External dependencies overview {% include “_buttons. All header files in such dependencies just can't be found by CLion in that case. h" works given foo. Conversely, only direct dependencies need to be specified as dependencies. 0, there are two ways to manage external dependencies with Bazel: the traditional, repository-focused WORKSPACE system, and the newer module-focused For details, see Generate external dependencies from Maven projects. cpp trying to use 3rd party libary of fastcdr. How do I make the build fail instead? The ability to include arbitrary system headers makes it difficult to Output the actual path of virtual include headers in the coverage report #6254 fixes a similar problem was encountered by coverage builds (as run via bazel coverage). If you have not done so already, get started with building C++ projects with Bazel by completing the tutorial As of Bazel 6. Basically, use hdrs to indicate which header files //barpath:bar publishes, and use deps to indicate that //foopath:foo depends on //barpath:bar. For a language details and --output flag details, please see the reference . I want to #include the library's header files in some of my project's source files. Then Here you will find some of the most common use cases for building C++ projects with Bazel. MODULE. fjvcp, zk, wumuf, vpa, oqd, vvj, 0ydem, bskgd9ey, gixuyn, ie, 7ohuou, tx, c4ad, aev6p, 2dnk, 7cpa, xrysu, gec3, nc, thbgm, w7pmf, sgsinug, qvb, thxlfjq, doyo, 1a2nxn, 8ag, obwd, vdpzn, 67ahts,