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by mx0a-0064b401.pphosted.com id 67L8X3nC3889945 On 20-08-2026 02:24 pm, Richard Purdie wrote: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender = and know the content is safe. > > On Fri, 2026-08-07 at 02:31 -0700, Sadineni, Harish via lists.openembed= ded.org wrote: >> From: Harish Sadineni >> >> YOCTO [#15061] >> >> Fixes 32-bit Cargo build failures when using multilib-enabled SDKs. >> >> Store the generated environment setup script in a target-specific >> subdirectory so that sourcing the SDK environment always loads the >> matching script for the selected target, avoiding accidental reuse of >> the 64-bit configuration when building for a 32-bit target. >> >> Also update `CARGO_TARGET__RUSTFLAGS` to add an explicit >> `-L` search path to the target `rustlib` directory inside the sysroot. >> This ensures Cargo can locate the correct target-specific Rust librari= es >> during cross-compilation with the cross-canadian toolchain. >> >> Signed-off-by: Harish Sadineni >> --- >> meta/recipes-devtools/rust/rust-cross-canadian.inc | 10 ++++++---- >> 1 file changed, 6 insertions(+), 4 deletions(-) >> >> diff --git a/meta/recipes-devtools/rust/rust-cross-canadian.inc b/meta= /recipes-devtools/rust/rust-cross-canadian.inc >> index f083bcda82..bdc63e221f 100644 >> --- a/meta/recipes-devtools/rust/rust-cross-canadian.inc >> +++ b/meta/recipes-devtools/rust/rust-cross-canadian.inc >> @@ -51,15 +51,17 @@ do_install () { >> chmod +x "$outfile" >> create_sdk_wrapper "${SYS_BINDIR}/target-rust-ccld-wrapper" "CC" >> >> - ENV_SETUP_DIR=3D${D}${base_prefix}/environment-setup.d >> - mkdir "${ENV_SETUP_DIR}" >> + ENV_SETUP_DIR=3D${D}${base_prefix}/environment-setup.d/${TARGET_S= YS} >> + mkdir -p "${ENV_SETUP_DIR}" >> RUST_ENV_SETUP_SH=3D"${ENV_SETUP_DIR}/${RUST_TARGET_SYS}_rust.sh= " >> >> RUST_TARGET_TRIPLE=3D`echo ${RUST_TARGET_SYS} | tr '[:lower:]' '= [:upper:]' | sed 's/-/_/g'` >> >> cat <<- EOF > "${RUST_ENV_SETUP_SH}" >> - export CARGO_TARGET_${RUST_TARGET_TRIPLE}_RUSTFLAGS=3D"--sysroot= =3D\$OECORE_TARGET_SYSROOT/usr -C link-arg=3D--sysroot=3D\$OECORE_TARGET_= SYSROOT" >> - export CARGO_BUILD_TARGET=3D"${RUST_TARGET_SYS}" >> + export RUST_TARGET_SYS_VALUE=3D"${RUST_TARGET_SYS}" >> + LIB_PATH=3D"\$OECORE_TARGET_SYSROOT/usr/${baselib}/rustlib/${RUS= T_TARGET_SYS}/lib" >> + export CARGO_TARGET_${RUST_TARGET_TRIPLE}_RUSTFLAGS=3D"--sysroot= =3D\$OECORE_TARGET_SYSROOT/usr -C link-arg=3D--sysroot=3D\$OECORE_TARGET_= SYSROOT -L \$LIB_PATH" >> + export CARGO_BUILD_TARGET=3D"${RUST_TARGET_SYS}" >> export RUST_TARGET_PATH=3D"\$OECORE_NATIVE_SYSROOT/usr/lib/${TA= RGET_SYS}/rustlib" >> EOF > I'm a bit confused here. The script in question already has > ${RUST_TARGET_SYS} in its name, so it is already target specific. Why > do we need to move it to a target specific directory? Hi Richard, Even though the script filename includes ${RUST_TARGET_SYS}, for=20 multilib SDKs both the 32-bit and 64-bit scripts end up in the same=20 environment-setup =C2=A0directory. The SDK's environment-sourcing logic sources every '*.sh' file in that=20 directory, so both scripts get sourced regardless of which target you're=20 building for. Since 'CARGO_TARGET__RUSTFLAGS' and=20 'CARGO_BUILD_TARGET' are set unconditionally in each script, whichever=20 one is sourced /last/ wins and that can silently override the 32-bit=20 settings with the 64-bit ones (or vice versa). That's what causes the=20 32-bit Cargo build to fail. Putting each script in a target-specific subdirectory=20 (environment-setup.d/${TARGET_SYS}/) ensures only the script matching=20 the selected target gets sourced, so the two configurations no longer=20 clobber each other. Thanks, Harish > > Cheers, > > Richard > --------------8lJ24tKl20v8qx1ieqNHIds0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit


On 20-08-2026 02:24 pm, Richard Purdie wrote:
CAUTION: This email comes from a non Wind River email account!
Do not click links or open attachments unless you recognize the sender and know the content is safe.

On Fri, 2026-08-07 at 02:31 -0700, Sadineni, Harish via lists.openembedded.org wrote:

From: Harish Sadineni <Harish.Sadineni@windriver.com>

YOCTO [#15061]

Fixes 32-bit Cargo build failures when using multilib-enabled SDKs.

Store the generated environment setup script in a target-specific
subdirectory so that sourcing the SDK environment always loads the
matching script for the selected target, avoiding accidental reuse of
the 64-bit configuration when building for a 32-bit target.

Also update `CARGO_TARGET_<TRIPLE>_RUSTFLAGS` to add an explicit
`-L` search path to the target `rustlib` directory inside the sysroot.
This ensures Cargo can locate the correct target-specific Rust libraries
during cross-compilation with the cross-canadian toolchain.

Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/recipes-devtools/rust/rust-cross-canadian.inc | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/meta/recipes-devtools/rust/rust-cross-canadian.inc b/meta/recipes-devtools/rust/rust-cross-canadian.inc
index f083bcda82..bdc63e221f 100644
--- a/meta/recipes-devtools/rust/rust-cross-canadian.inc
+++ b/meta/recipes-devtools/rust/rust-cross-canadian.inc
@@ -51,15 +51,17 @@ do_install () {
     chmod +x "$outfile"
     create_sdk_wrapper "${SYS_BINDIR}/target-rust-ccld-wrapper" "CC"

-    ENV_SETUP_DIR=${D}${base_prefix}/environment-setup.d
-    mkdir "${ENV_SETUP_DIR}"
+    ENV_SETUP_DIR=${D}${base_prefix}/environment-setup.d/${TARGET_SYS}
+    mkdir -p "${ENV_SETUP_DIR}"
     RUST_ENV_SETUP_SH="${ENV_SETUP_DIR}/${RUST_TARGET_SYS}_rust.sh"

     RUST_TARGET_TRIPLE=`echo ${RUST_TARGET_SYS} | tr '[:lower:]' '[:upper:]' | sed 's/-/_/g'`

     cat <<- EOF > "${RUST_ENV_SETUP_SH}"
-     export CARGO_TARGET_${RUST_TARGET_TRIPLE}_RUSTFLAGS="--sysroot=\$OECORE_TARGET_SYSROOT/usr -C link-arg=--sysroot=\$OECORE_TARGET_SYSROOT"
-     export CARGO_BUILD_TARGET="${RUST_TARGET_SYS}"
+     export RUST_TARGET_SYS_VALUE="${RUST_TARGET_SYS}"
+     LIB_PATH="\$OECORE_TARGET_SYSROOT/usr/${baselib}/rustlib/${RUST_TARGET_SYS}/lib"
+     export CARGO_TARGET_${RUST_TARGET_TRIPLE}_RUSTFLAGS="--sysroot=\$OECORE_TARGET_SYSROOT/usr -C link-arg=--sysroot=\$OECORE_TARGET_SYSROOT -L \$LIB_PATH"
+        export CARGO_BUILD_TARGET="${RUST_TARGET_SYS}"
      export RUST_TARGET_PATH="\$OECORE_NATIVE_SYSROOT/usr/lib/${TARGET_SYS}/rustlib"
      EOF

I'm a bit confused here. The script in question already has
${RUST_TARGET_SYS} in its name, so it is already target specific. Why
do we need to move it to a target specific directory?
Hi Richard,

Even though the script filename includes ${RUST_TARGET_SYS}, for multilib SDKs both the 32-bit and 64-bit scripts end up in the same environment-setup  directory.

The SDK's environment-sourcing logic sources every '*.sh' file in that directory, so both scripts get sourced regardless of which target you're building for. Since 'CARGO_TARGET_<TRIPLE>_RUSTFLAGS' and 'CARGO_BUILD_TARGET' are set unconditionally in each script, whichever one is sourced last wins and that can silently override the 32-bit settings with the 64-bit ones (or vice versa). That's what causes the 32-bit Cargo build to fail.

Putting each script in a target-specific subdirectory (environment-setup.d/${TARGET_SYS}/) ensures only the script matching the selected target gets sourced, so the two configurations no longer clobber each other.

Thanks,
Harish

 

Cheers,

Richard
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