Rust crates build dependecy C libraries using "CC" crate. This crate adds some default compiler parameters depending on target arch. For some target archs these parameters conflict with the parameters defined by OE.
Warnings/errors like this can be seen in the case: cc1: error: switch '-mcpu=cortex-a15' conflicts with switch '-march=armv7-a+fp' [-Werror] Lets use only the OE parameters by exporting CRATE_CC_NO_DEFAULTS. https://github.com/rust-lang/cc-rs#external-configuration-via-environment-variables This patch fixes https://bugzilla.yoctoproject.org/show_bug.cgi?id=14947 Signed-off-by: Anton Antonov <anton.anto...@arm.com> --- meta/classes-recipe/rust-target-config.bbclass | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/meta/classes-recipe/rust-target-config.bbclass b/meta/classes-recipe/rust-target-config.bbclass index 2710b4325d..5685897462 100644 --- a/meta/classes-recipe/rust-target-config.bbclass +++ b/meta/classes-recipe/rust-target-config.bbclass @@ -401,3 +401,16 @@ python do_rust_gen_targets () { addtask rust_gen_targets after do_patch before do_compile do_rust_gen_targets[dirs] += "${RUST_TARGETS_DIR}" +# For building C dependecies use only compiler parameters defined in OE-core +# and ignore the default parameters defined in the CC crate. +# https://github.com/rust-lang/cc-rs#external-configuration-via-environment-variables + +# The CC crate checks for CRATE_CC_NO_DEFAULTS existence not value. +# Even empty CRATE_CC_NO_DEFAULTS will be taken into account. +# For rust native recipes we still rely on the CC crate parameters. +# Currently it's not possible to export a variable conditionally, +# so, let's export it for class-target only + +do_compile:prepend:class-target() { + export CRATE_CC_NO_DEFAULTS=1 +} -- 2.25.1
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