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Fix darwin flag when cross-compiling from Linux to MacOS #413

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merged 4 commits into from
Sep 7, 2023
Merged

Fix darwin flag when cross-compiling from Linux to MacOS #413

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0a69af3
Attempt at fixing darwin flag for Linux to MacOS cross-compilation.
benradf Sep 6, 2023
5cfcc44
Update README.
benradf Sep 6, 2023
969c81b
Update README again.
benradf Sep 7, 2023
c604e89
Merge branch 'master' into fix_cross_cpu
mergify[bot] Sep 7, 2023
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19 changes: 12 additions & 7 deletions examples/toolchains/cc_cross_osx_to_linux_amd64/README.md
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Original file line number Diff line number Diff line change
@@ -1,13 +1,18 @@
C++ With Dependencies Toolchain Example
=======================================
Linux C++ In Docker, Cross Compiled on MacOS
============================================

This is an example C++ project with dependencies that uses `rules_cc`.

This example uses the Nix package manager to provide C++ dependencies, and as such only works with Nix installed. Demonstrating other methods of providing C++ dependencies is out of scope of this example.
Builds a Docker image containing a C++ program cross compiled for Linux, on MacOS.

# Usage

To run the example with Nix, issue the following command:
To build the image with Nix, issue the following command:
```
nix-shell --command 'bazel build --config=cross :hello_image_tarball'
```
nix-shell --command 'bazel run --config=cross :hello'

You can then do load the image into Docker with:
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```
docker load -i bazel-bin/hello_image_tarball/tarball.tar
```

And run it as you normally would with Docker.
8 changes: 4 additions & 4 deletions toolchains/cc/cc.bzl
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Expand Up @@ -122,8 +122,8 @@ def _parse_cc_toolchain_info(content, filename):

def _nixpkgs_cc_toolchain_config_impl(repository_ctx):
host_cpu = get_cpu_value(repository_ctx)
cross_cpu = repository_ctx.attr.cross_cpu or host_cpu
darwin = (host_cpu == "darwin" or host_cpu == "darwin_arm64") and cross_cpu == host_cpu
cpu_value = repository_ctx.attr.cross_cpu or host_cpu
darwin = cpu_value == "darwin" or cpu_value == "darwin_arm64"
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cc_toolchain_info_file = repository_ctx.path(repository_ctx.attr.cc_toolchain_info)
if not cc_toolchain_info_file.exists and not repository_ctx.attr.fail_not_supported:
Expand Down Expand Up @@ -187,7 +187,7 @@ def _nixpkgs_cc_toolchain_config_impl(repository_ctx):
repository_ctx.path(repository_ctx.attr._build),
{
"%{cc_toolchain_identifier}": "local",
"%{name}": cross_cpu,
"%{name}": cpu_value,
"%{modulemap}": ("\":module.modulemap\"" if needs_module_map else "None"),
"%{supports_param_files}": "0" if darwin else "1",
"%{cc_compiler_deps}": get_starlark_list(
Expand All @@ -200,7 +200,7 @@ def _nixpkgs_cc_toolchain_config_impl(repository_ctx):
"%{abi_libc_version}": "local",
"%{host_system_name}": "local",
"%{target_libc}": "macosx" if darwin else "local",
"%{target_cpu}": cross_cpu,
"%{target_cpu}": cpu_value,
"%{target_system_name}": "local",
"%{tool_paths}": ",\n ".join(
['"%s": "%s"' % (k, v) for (k, v) in info.tool_paths.items()],
Expand Down