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Rust includes an option `download-ci-llvm` in config.toml that enables
downloading prebuilt LLVM binaries from Rust's CI infrastructure instead
of building LLVM from source. This option helps speed up the bootstrap
process and is enabled by default starting from Rust 1.83.
However, starting from commit [1] the bootstrap process performs
a strict check via the function
check_incompatible_options_for_ci_llvm().
This validation, implemented in the function
check_incompatible_options_for_ci_llvm(), checks for any incompatible
custom options such as `llvm.ldflags`, `llvm.cflags`, `targets`, etc.
If any of these are set locally and differ from the values used to build
the CI-provided LLVM, the build fails immediately with the error:
ERROR: Setting `llvm.ldflags` is incompatible with
`llvm.download-ci-llvm`.
Buildroot explicitly sets `llvm.ldflags` in rust.mk to ensure proper
host linking during the build of host-rust. Removing this setting may
introduce portability or reliability issues across toolchains.
To address the issue without compromising the build environment, this
patch disables the use of CI-provided LLVM by setting:
[llvm]
download-ci-llvm = false
This follows the recommendation from the Rust bootstrap script itself.
Note: this is a temporary workaround to restore compatibility with Rust
≥1.83. Other solutions will be investigated to avoid disabling the use
of prebuilt LLVM in the future, while preserving Buildroot’s reproducible
build setup.
[1] 9df7680ecf
Signed-off-by: El Mehdi YOUNES <elmehdi.younes@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches