.github/workflows/ci.yml

@@ -178,8 +178,9 @@ jobs:
             for target in bpfeb-unknown-none bpfel-unknown-none; do
               echo "::group::Build and test for $arch / $target"
               if ! (
+                export CARGO_CFG_BPF_TARGET_ARCH="$arch"
 
-                RUSTFLAGS="--cfg bpf_target_arch=\"$arch\"" cargo +nightly hack build \
+                cargo +nightly hack build \
                   --target "$target" \
                   -Z build-std=core \
                   --package aya-ebpf \

aya-build/src/lib.rs

@@ -11,19 +11,21 @@ use std::{
 use anyhow::{Context as _, Result, anyhow};
 use cargo_metadata::{Artifact, CompilerMessage, Message, Target};
 
-#[derive(Default)]
 pub struct Package<'a> {
     pub name: &'a str,
     pub root_dir: &'a str,
-    pub no_default_features: bool,
-    pub features: &'a [&'a str],
 }
 
-fn target_arch_fixup(target_arch: Cow<'_, str>) -> Cow<'_, str> {
+fn target_arch() -> Cow<'static, str> {
+    const TARGET_ARCH: &str = "CARGO_CFG_TARGET_ARCH";
+    let target_arch = env::var_os(TARGET_ARCH).unwrap_or_else(|| panic!("{TARGET_ARCH} not set"));
+    let target_arch = target_arch.into_encoded_bytes();
+    let target_arch = String::from_utf8(target_arch)
+        .unwrap_or_else(|err| panic!("String::from_utf8({TARGET_ARCH}): {err:?}"));
     if target_arch.starts_with("riscv64") {
         "riscv64".into()
     } else {
-        target_arch
+        target_arch.into()
     }
 }
 
@@ -56,22 +58,10 @@ pub fn build_ebpf<'a>(
         return Err(anyhow!("unsupported endian={endian:?}"));
     };
 
-    const TARGET_ARCH: &str = "CARGO_CFG_TARGET_ARCH";
-    let bpf_target_arch =
-        env::var_os(TARGET_ARCH).unwrap_or_else(|| panic!("{TARGET_ARCH} not set"));
-    let bpf_target_arch = bpf_target_arch
-        .into_string()
-        .unwrap_or_else(|err| panic!("OsString::into_string({TARGET_ARCH}): {err:?}"));
-    let bpf_target_arch = target_arch_fixup(bpf_target_arch.into());
+    let arch = target_arch();
     let target = format!("{target}-unknown-none");
 
-    for Package {
-        name,
-        root_dir,
-        no_default_features,
-        features,
-    } in packages
-    {
+    for Package { name, root_dir } in packages {
         // We have a build-dependency on `name`, so cargo will automatically rebuild us if `name`'s
         // *library* target or any of its dependencies change. Since we depend on `name`'s *binary*
         // targets, that only gets us half of the way. This stanza ensures cargo will rebuild us on
@@ -94,10 +84,6 @@ pub fn build_ebpf<'a>(
             "--target",
             &target,
         ]);
-        if no_default_features {
-            cmd.arg("--no-default-features");
-        }
-        cmd.args(["--features", &features.join(",")]);
 
         {
             const SEPARATOR: &str = "\x1f";
@@ -106,7 +92,7 @@ pub fn build_ebpf<'a>(
 
             for s in [
                 "--cfg=bpf_target_arch=\"",
-                &bpf_target_arch,
+                &arch,
                 "\"",
                 SEPARATOR,
                 "-Cdebuginfo=2",
@@ -216,45 +202,16 @@ impl<'a> Toolchain<'a> {
 
 /// Emit cfg flags that describe the desired BPF target architecture.
 pub fn emit_bpf_target_arch_cfg() {
-    // The presence of this environment variable indicates that `--cfg
-    // bpf_target_arch="..."` was passed to the compiler, so we don't need to
-    // emit it again. Note that we cannot *set* this environment variable - it
-    // is set by cargo.
-    const BPF_TARGET_ARCH: &str = "CARGO_CFG_BPF_TARGET_ARCH";
-    println!("cargo:rerun-if-env-changed={BPF_TARGET_ARCH}");
-
-    // Users may directly set this environment variable in situations where
-    // using RUSTFLAGS to set `--cfg bpf_target_arch="..."` is not possible or
-    // not ergonomic. In contrast to RUSTFLAGS this mechanism reuses the target
-    // cache for all values, producing many more invalidations.
-    const AYA_BPF_TARGET_ARCH: &str = "AYA_BPF_TARGET_ARCH";
-    println!("cargo:rerun-if-env-changed={AYA_BPF_TARGET_ARCH}");
-
-    const HOST: &str = "HOST";
-    println!("cargo:rerun-if-env-changed={HOST}");
-
-    if std::env::var_os(BPF_TARGET_ARCH).is_none() {
-        let host = std::env::var_os(HOST).unwrap_or_else(|| panic!("{HOST} not set"));
-        let host = host
-            .into_string()
-            .unwrap_or_else(|err| panic!("OsString::into_string({HOST}): {err:?}"));
-        let host = host.as_str();
-
-        let bpf_target_arch = if let Some(bpf_target_arch) = std::env::var_os(AYA_BPF_TARGET_ARCH) {
-            bpf_target_arch
-                .into_string()
-                .unwrap_or_else(|err| {
-                    panic!("OsString::into_string({AYA_BPF_TARGET_ARCH}): {err:?}")
-                })
-                .into()
-        } else {
-            target_arch_fixup(
-                host.split_once('-')
-                    .map_or(host, |(arch, _rest)| arch)
-                    .into(),
-            )
-        };
-        println!("cargo:rustc-cfg=bpf_target_arch=\"{bpf_target_arch}\"");
+    const RUSTFLAGS: &str = "CARGO_ENCODED_RUSTFLAGS";
+
+    println!("cargo:rerun-if-env-changed={RUSTFLAGS}");
+    let rustc_cfgs = std::env::var_os(RUSTFLAGS).unwrap_or_else(|| panic!("{RUSTFLAGS} not set"));
+    let rustc_cfgs = rustc_cfgs
+        .to_str()
+        .unwrap_or_else(|| panic!("{RUSTFLAGS}={rustc_cfgs:?} not unicode"));
+    if !rustc_cfgs.contains("bpf_target_arch") {
+        let arch = target_arch();
+        println!("cargo:rustc-cfg=bpf_target_arch=\"{arch}\"");
     }
 
     print!("cargo::rustc-check-cfg=cfg(bpf_target_arch, values(");

aya/src/bpf.rs

@@ -293,13 +293,8 @@ impl<'a> EbpfLoader<'a> {
 
     /// Override the value of a global variable.
     #[deprecated(since = "0.13.2", note = "please use `override_global` instead")]
-    pub fn set_global<T: Into<GlobalData<'a>>>(
-        &mut self,
-        name: &'a str,
-        value: T,
-        must_exist: bool,
-    ) -> &mut Self {
-        self.override_global(name, value, must_exist)
+    pub fn set_global<T: Into<GlobalData<'a>>>(&mut self, name: &'a str, value: T) -> &mut Self {
+        self.override_global(name, value, false)
     }
 
     /// Set the max_entries for specified map.

test/integration-test/build.rs

@@ -219,7 +219,6 @@ fn main() -> Result<()> {
                 .parent()
                 .ok_or_else(|| anyhow!("no parent for {manifest_path}"))?
                 .as_str(),
-            ..Default::default()
         };
         aya_build::build_ebpf([integration_ebpf_package], aya_build::Toolchain::default())?;
     } else {

xtask/public-api/aya-build.txt

@@ -27,12 +27,8 @@ pub fn aya_build::Toolchain<'a>::borrow_mut(&mut self) -> &mut T
 impl<T> core::convert::From<T> for aya_build::Toolchain<'a>
 pub fn aya_build::Toolchain<'a>::from(t: T) -> T
 pub struct aya_build::Package<'a>
-pub aya_build::Package::features: &'a [&'a str]
 pub aya_build::Package::name: &'a str
-pub aya_build::Package::no_default_features: bool
 pub aya_build::Package::root_dir: &'a str
-impl<'a> core::default::Default for aya_build::Package<'a>
-pub fn aya_build::Package<'a>::default() -> aya_build::Package<'a>
 impl<'a> core::marker::Freeze for aya_build::Package<'a>
 impl<'a> core::marker::Send for aya_build::Package<'a>
 impl<'a> core::marker::Sync for aya_build::Package<'a>

xtask/public-api/aya.txt

@@ -10750,7 +10750,7 @@ pub fn aya::EbpfLoader<'a>::map_max_entries(&mut self, name: &'a str, size: u32)
 pub fn aya::EbpfLoader<'a>::map_pin_path<P: core::convert::Into<alloc::borrow::Cow<'a, std::path::Path>>>(&mut self, name: &'a str, path: P) -> &mut Self
 pub fn aya::EbpfLoader<'a>::new() -> Self
 pub fn aya::EbpfLoader<'a>::override_global<T: core::convert::Into<aya::GlobalData<'a>>>(&mut self, name: &'a str, value: T, must_exist: bool) -> &mut Self
-pub fn aya::EbpfLoader<'a>::set_global<T: core::convert::Into<aya::GlobalData<'a>>>(&mut self, name: &'a str, value: T, must_exist: bool) -> &mut Self
+pub fn aya::EbpfLoader<'a>::set_global<T: core::convert::Into<aya::GlobalData<'a>>>(&mut self, name: &'a str, value: T) -> &mut Self
 pub fn aya::EbpfLoader<'a>::set_max_entries(&mut self, name: &'a str, size: u32) -> &mut Self
 pub fn aya::EbpfLoader<'a>::verifier_log_level(&mut self, level: aya::VerifierLogLevel) -> &mut Self
 impl core::default::Default for aya::EbpfLoader<'_>