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add cfg(target_env) to the reference #27883

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Aug 18, 2015
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add cfg(target_env) to the reference #27883

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5 changes: 5 additions & 0 deletions src/doc/reference.md
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Expand Up @@ -2059,6 +2059,11 @@ The following configurations must be defined by the implementation:
`"mips"`, `"powerpc"`, `"arm"`, or `"aarch64"`.
* `target_endian = "..."`. Endianness of the target CPU, either `"little"` or
`"big"`.
* `target_env = ".."` - an option provided by the compiler by default
describing the runtime environment of the target platform. Some examples of
this are `musl` for builds targeting the MUSL libc implementation, `msvc` for
Windows builds targeting MSVC, and `gnu` frequently the rest of the time. This
option may also be blank on some platforms.
* `target_family = "..."`. Operating system family of the target, e. g.
`"unix"` or `"windows"`. The value of this configuration option is defined
as a configuration itself, like `unix` or `windows`.
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