I was playing recently with Rust and one of the feature it supports is ability to link to C code. This post demonstrates the steps to do so, using Cargo as a primary build tool for Rust part of the code, invoking CMake to do the native C code compilation, producing a static library that Rust picks up and calls.

There is one bit in CMakeLists. We need to add the following lines to Cargo. This will tell cargo that it will be using cmake crate as extra dependency for the build as well as that you will be using custom build extension, which is a Rust code in build. Make it look like this:. First line is rather straightofoward - declaring crate to be used. Then yoy bring cmake::Config type into scope.

cargo rpath

And this is exactly what this line is doing:. Next lines write to stdout special command for Cargo to set library search path and pick your libfoo. Pay attention to naming conventions where lib prefix and. When you run cargo build -vv you will see some detailed output of how the machinery workes together.

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First things you see is Cargo pulling dependencies: cmake and dependent cc crates in this case. You may also check that dependency on the cmake crate website here. Last line is interesting and worth paying attention for, when comes to troubleshooting. This is where two worlds meet, by more or less officially agreed convention.

Ok, time to consume the library code from Rust. The initial section declares an external function. Note that this prototype requires a bit of manual conversion from C prototype to Rust one. Once compiler and cargo run you should now see a nice program outputs on the stdout:. I hope that recipe is useful. You can download the example code from a git repository here.

Note that is has some extra comments and mainenance files though. Compiling cc v1. Hello, world from Rust! Hello, world from C! Value passed: 3. Previous Previous post: New reactive operators and sources.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I have an executable rtest and a dylib libcpp2rs. The library is linked to the executable through FFI:. My build. After some researches around I've found that the actual problem is libcpp2rs. It should looks like:. Learn more. Asked 3 years, 11 months ago.

Active 3 years, 11 months ago. Viewed times. I'm trying to solve a problem with foreign library loading with Rust. Inputs: I have an executable rtest and a dylib libcpp2rs.

Is it possible to pass rpath value to cargo? Alexander Stavonin. Alexander Stavonin Alexander Stavonin 6 6 silver badges 21 21 bronze badges. Please edit your question to include where libcpp2rs. Active Oldest Votes. Sign up or log in Sign up using Google.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. For building rust code in automation, it would be convenient if the official builds of rustc, rustdoc, cargo, etc. Fragile build systems. See in particular the discussion at I had tried to push back against this change back when it was put forward, but I am ignorant of distros' processes and thus decided that I could not argue effectively on that front.

I didn't know about --enable-rpath That should fix the issue, but is another step away from being able to use official builds. The bug discussion mostly seems to be about rpath in rustc's output.

I'm just asking for it in rustc itself. Changing the default of the configure switch, not of -C rpath if I understand correctly. What is the rationale for the rustc builds one can download are not using --enable-rpath? They are the builds that would benefit from it the most CC alexcrichton brson. The past motivations for this change are outlined in the many linked issues here I'll also throw in It seems fine, however, to enable this sort of setting by default when building the compiler itself but not for the executables the compiler itself then generates.

I don't think we can "just use" the -C rpath option as it's not quite what we want for our own distribution, so this will likely either passing weird -C link-args or using external tools to frob these settings after the artifacts are built.

Not sure I agree that it's fine for the rustc case. The main argument seems the same to me there - it's different than windows. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. This comment has been minimized.

Sign in to view. Contributor Author. In short, We used to do this, and we explicitly stopped doing it, for various reasons. I guess you can view this from two angles: On one hand rpath doesn't exist on Windows but does on Unix On the other hand the compiler works by default on Windows but doesn't work on Unix I'd probably lean more towards consistency on the latter point for the compiler itself at least.

This means that from-source builds, including our release channels, will have this option enabled as well.Profiles provide a way to alter the compiler settings, influencing things like optimizations and debugging symbols.

Cargo has 4 built-in profiles: devreleasetestand bench. It automatically chooses the profile based on which command is being run, the package and target that is being built, and command-line flags like --release.

The selection process is described below. Profile settings can be changed in Cargo. Cargo only looks at the profile settings in the Cargo. Profile settings defined in dependencies will be ignored. Additionally, profiles can be overridden from a config definition. Specifying a profile in a config file or environment variable will override the settings from Cargo. The opt-level setting controls the -C opt-level flag which controls the level of optimization.

Higher optimization levels may produce faster runtime code at the expense of longer compiler times. Higher levels may also change and rearrange the compiled code which may make it harder to use with a debugger. It is recommended to experiment with different levels to find the right balance for your project. There may be surprising results, such as level 3 being slower than 2or the "s" and "z" levels not being necessarily smaller. You may also want to reevaluate your settings over time as newer versions of rustc changes optimization behavior.

See also Profile Guided Optimization for more advanced optimization techniques. The debug setting controls the -C debuginfo flag which controls the amount of debug information included in the compiled binary. These may be things that are too expensive or otherwise undesirable in a release build.

The overflow-checks setting controls the -C overflow-checks flag which controls the behavior of runtime integer overflow.

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When overflow-checks are enabled, a panic will occur on overflow. LTO can produce better optimized code, using whole-program analysis, at the cost of longer linking time.

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See also the -C linker-plugin-lto rustc flag for cross-language LTO. The panic setting controls the -C panic flag which controls which panic strategy to use. When set to "unwind"the actual value depends on the default of the target platform. Tests, benchmarks, build scripts, and proc macros ignore the panic setting.

The rustc test harness currently requires unwind behavior. See the panic-abort-tests unstable flag which enables abort behavior. Additionally, when using the abort strategy and building a test, all of the dependencies will also be forced to built with the unwind strategy.

The incremental setting controls the -C incremental flag which controls whether or not incremental compilation is enabled. Incremental compilation causes rustc to to save additional information to disk which will be reused when recompiling the crate, improving re-compile times.

The additional information is stored in the target directory. The codegen-units setting controls the -C codegen-units flag which controls how many "code generation units" a crate will be split into. More code generation units allows more of a crate to be processed in parallel possibly reducing compile time, but may produce slower code.

The default is for incremental builds, and 16 for non-incremental builds. The rpath setting controls the -C rpath flag which controls whether or not rpath is enabled. The dev profile is used for normal development and debugging. It is the default for build commands like cargo build. The release profile is intended for optimized artifacts used for releases and in production.Cargo bakes in the concept of Semantic Versioningso make sure you follow some basic rules:.

This field specifies a file in the repository which is a build script for building native code. More information can be found in the build script guide.

You can explicitly specify to Cargo that a set of globs should be ignored or included for the purposes of packaging and rebuilding a package. The globs specified in the exclude field identify a set of files that are not included when a package is published as well as ignored for the purposes of detecting when to rebuild a package, and the globs in include specify files that are explicitly included. The options are mutually exclusive: setting include will override an exclude.

Note that include must be an exhaustive list of files as otherwise necessary source files may not be included. The publish field can be used to prevent a package from being published to a repository by mistake. The workspace field can be used to configure the workspace that this package will be a member of.

If not specified this will be inferred as the first Cargo. There are a number of optional metadata fields also accepted under the [package] section:. The crates. These keys provide useful information to users of the registry and also influence the search ranking of a crate.

It is highly discouraged to omit everything in a published crate. Cargo by default will warn about unused keys in Cargo. The package. This section can be used for tools which would like to store project configuration in Cargo. For example:. See the specifying dependencies page for information on the [dependencies][dev-dependencies]and target-specific [target.

Cargo supports custom configuration of how rustc is invoked through profiles at the top level. This is done so the top-level project has control over how its dependencies are compiled. There are five currently supported profile names, all of which have the same configuration available to them. Listed below is the configuration available, along with the defaults for each profile.

A feature of a package is either an optional dependency, or a set of other features. The format for specifying features is:. Note that it is explicitly allowed for features to not actually activate any optional dependencies. One major use-case for this feature is specifying optional features in end-products. For example, the Servo project may want to include optional features that people can enable or disable when they build it.

In that case, Servo will describe features in its Cargo. In most cases, the concept of optional dependency in a library is best expressed as a separate package that the top-level application depends on.


However, high-level packages, like Iron or Piston, may want the ability to curate a number of packages for easy installation. The current Cargo system allows them to curate a number of mandatory dependencies into a single package for easy installation. In almost all cases, it is an antipattern to use these features outside of high-level packages that are designed for curation.

If a feature is optional, it can almost certainly be expressed as a separate package.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. This stabilizes the profile-overrides feature.

This was proposed in RFC and implemented in This includes a new documentation chapter on profiles.

CMake RPATH handling

See the "Overrides" section in profiles. Note: The config-profile and named-profiles features are still unstable. Closes Team member ehuss has proposed to merge this.

The next step is review by the rest of the tagged team members:. Once a majority of reviewers approve and at most 2 approvals are outstandingthis will enter its final comment period.

If you spot a major issue that hasn't been raised at any point in this process, please speak up! See this document for info about what commands tagged team members can give me. Please resolve the merge conflicts. The final comment period, with a disposition to mergeas per the review aboveis now complete. As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

I wasn't confident it is correct or clear or goes into too much or too little detail. Particularly the last paragraph. Looks accurate to me though. Basically I just want to make sure folks know they can contact us if they're weirded out.The Cargo. Every manifest file consists of the following sections:. The only fields required by Cargo are name and version. If publishing to a registry, the registry may require additional fields.

See the notes below and the publishing chapter for requirements for publishing to crates.

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The package name is an identifier used to refer to the package. It is used when listed as a dependency in another package, and as the default name of inferred lib and bin targets. Note that cargo new and cargo init impose some additional restrictions on the package name, such as enforcing that it is a valid Rust identifier and not a keyword.

Cargo bakes in the concept of Semantic Versioningso make sure you follow some basic rules:. The authors field lists people or organizations that are considered the "authors" of the package. These names will be listed on the crate's page on crates. An optional email address may be included within angled brackets at the end of each author.

Note : crates. You can opt in to a specific Rust Edition for your package with the edition key in Cargo. If you don't specify the edition, it will default to The edition key affects which edition your package is compiled with.

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Cargo will always generate packages via cargo new with the edition key set to the latest edition. The description is a short blurb about the package.

The Cargo Book

This should be plain text not Markdown. The documentation field specifies a URL to a website hosting the crate's documentation.

cargo rpath

If no URL is specified in the manifest file, crates. At this time, the site rust-ci. The readme field should be the path to a file in the package root relative to this Cargo.

cargo rpath

This file will be transferred to the registry when you publish. The homepage field should be a URL to a site that is the home page for your package. The license field contains the name of the software license that the package is released under. The license-file field contains the path to a file containing the text of the license relative to this Cargo. The name must be a known license from the SPDX license list 3.

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Parentheses are not currently supported. See the SPDX site for more information. Using OR indicates the user may choose either license. Using AND indicates the user must comply with both licenses simultaneously. The WITH operator indicates a license with a special exception.

Some examples:. If a package is using a nonstandard license, then the license-file field may be specified in lieu of the license field. The keywords field is an array of strings that describe this package.

This can help when searching for the package on a registry, and you may choose any words that would help someone find this crate.

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The categories field is an array of strings of the categories this package belongs to. The workspace field can be used to configure the workspace that this package will be a member of. If not specified this will be inferred as the first Cargo.