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rustc: Implement a new --print cfg flag

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This commit is an implementation of the new compiler flags required by [RFC
1361][rfc]. This specifically adds a new `cfg` option to the `--print` flag to
the compiler. This new directive will print the defined `#[cfg]` directives by
the compiler for the target in question.

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
This commit is contained in:
Alex Crichton 2016-01-25 11:36:18 -08:00
parent 26105b1a37
commit a1ffe6b6bb
3 changed files with 36 additions and 0 deletions
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15
src/test/run-make/print-cfg/Makefile Normal file
View file

@ -0,0 +1,15 @@
-include ../tools.mk
all: default
$(RUSTC) --target x86_64-pc-windows-gnu --print cfg | grep windows
$(RUSTC) --target x86_64-pc-windows-gnu --print cfg | grep x86_64
$(RUSTC) --target i686-pc-windows-msvc --print cfg | grep msvc
$(RUSTC) --target i686-apple-darwin --print cfg | grep macos
ifdef IS_WINDOWS
default:
$(RUSTC) --print cfg | grep windows
else
default:
$(RUSTC) --print cfg | grep unix
endif