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doc: clarify different target has different set of CARGO_CFG_* values #13069

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Nov 29, 2023
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doc: clarify different target has different set of CARGO_CFG_* values #13069

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2 changes: 2 additions & 0 deletions src/doc/src/reference/environment-variables.md
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Expand Up @@ -353,6 +353,8 @@ let out_dir = env::var("OUT_DIR").unwrap();
* `CARGO_CFG_TARGET_POINTER_WIDTH=64` --- The CPU [pointer width].
* `CARGO_CFG_TARGET_ENDIAN=little` --- The CPU [target endianness].
* `CARGO_CFG_TARGET_FEATURE=mmx,sse` --- List of CPU [target features] enabled.
> Note that different [target triples][Target Triple] have different sets of `cfg` values,
> hence variables present in one target triple might not be available in the other.
* `OUT_DIR` --- the folder in which all output and intermediate artifacts should
be placed. This folder is inside the build directory for the
package being built, and it is unique for the package in question.
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