How do I use an environment variable in a .cargo/config file?

Question

I'm using .cargo/config like this

[target.arm-linux-androideabi] linker = "/home/rico/android-ndk-r13b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc"

But /home/rico/android-ndk-r13b is my NDK_HOME, not NDK_HOME of everyone

How can I specify to use $NDK_HOME?

Something like:

[target.arm-linux-androideabi] linker = "$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc"

ozkriff · Accepted Answer · 2018-08-26 07:23:56Z

.cargo/config doesn't support environment variables. But you can configure the linker with RUSTC_LINKER environment variable:

export RUSTC_LINKER="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc" cargo build # will try to use NDK's linker now

Though it'll work for all targets, not only for arm-linux-androideabi.

Any idea whether .cargo/config supports home directory (having difficulties finding this, probably not).

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