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Update armv7-unknown-linux-uclibceabi platform support page. #94777

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merged 1 commit into from
Mar 13, 2022
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Update armv7-unknown-linux-uclibceabi platform support page. #94777

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32 changes: 21 additions & 11 deletions src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabi.md
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Original file line number Diff line number Diff line change
Expand Up @@ -36,8 +36,8 @@ target = ["armv7-unknown-linux-uclibceabi"]
cc = "/path/to/arm-unknown-linux-uclibcgnueabi-gcc"
cxx = "/path/to/arm-unknown-linux-uclibcgnueabi-g++"
ar = "path/to/arm-unknown-linux-uclibcgnueabi-ar"
ranlib = "path/to/arm-unknown-linux-uclibcgnueabi-"
linker = "/path/to/arm-unknown-linux-uclibcgnueabi-"
ranlib = "path/to/arm-unknown-linux-uclibcgnueabi-ranlib"
linker = "/path/to/arm-unknown-linux-uclibcgnueabi-gcc"
```

## Building Rust programs
Expand Down Expand Up @@ -75,27 +75,37 @@ To cross compile, you'll need to:
```
* Build with:
```text
CC=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CXX=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-g++ \
AR=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-ar \
CC_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CXX_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-g++ \
AR_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-ar \
CFLAGS_armv7_unknown_linux_uclibceabi="-march=armv7-a -mtune=cortex-a9" \
CXXFLAGS_armv7_unknown_linux_uclibceabi="-march=armv7-a -mtune=cortex-a9" \
CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABI_LINKER=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABI_RUSTFLAGS='-Clink-arg=-s -Clink-arg=-Wl,--dynamic-linker=/mmc/lib/ld-uClibc.so.1 -Clink-arg=-Wl,-rpath,/mmc/lib' \
cargo +stage2 build --target armv7-unknown-linux-uclibceabi --release
cargo +stage2 \
build \
--target armv7-unknown-linux-uclibceabi \
--release
```
* Copy the binary to your target device and run.

We specify `CC`, `CXX`, and `AR` because somtimes a project or a subproject requires the use of your `'C'` cross toolchain. Since Tomatoware has a modified sysroot we also pass via RUSTFLAGS the location of the dynamic-linker and rpath.
We specify `CC`, `CXX`, `AR`, `CFLAGS`, and `CXXFLAGS` environment variables because somtimes a project or a subproject requires the use of your `'C'` cross toolchain. Since Tomatoware has a modified sysroot we also pass via RUSTFLAGS the location of the dynamic-linker and rpath.

### Test with QEMU

To test a cross-compiled binary on your build system follow the instructions for `Cross Compilation`, install `qemu-arm-static`, and run with the following.
```text
CC=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CXX=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-g++ \
AR=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-ar \
CC_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CXX_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-g++ \
AR_armv7_unknown_linux_uclibceabi=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-ar \
CFLAGS_armv7_unknown_linux_uclibceabi="-march=armv7-a -mtune=cortex-a9" \
CXXFLAGS_armv7_unknown_linux_uclibceabi="-march=armv7-a -mtune=cortex-a9" \
CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABI_LINKER=/opt/tomatoware/arm-soft-mmc/bin/arm-linux-gcc \
CARGO_TARGET_ARMV7_UNKNOWN_LINUX_UCLIBCEABI_RUNNER="qemu-arm-static -L /opt/tomatoware/arm-soft-mmc/arm-tomatoware-linux-uclibcgnueabi/sysroot/" \
cargo +stage2 run --target armv7-unknown-linux-uclibceabi --release
cargo +stage2 \
run \
--target armv7-unknown-linux-uclibceabi \
--release
```
### Run in a chroot

Expand Down