add Compat.Sys.BINDIR (#433)

* add Compat.Sys.BINDIR

* import Sys.BINDIR into Compat.Sys on v0.7 and add tests

README.md

@@ -255,6 +255,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `Complex32`, `Complex64`, and `Complex128` are now `ComplexF16`, `ComplexF32`, and
   `ComplexF64`, respectively ([#24647]).
 
+* `JULIA_HOME` is now `Sys.BINDIR`, available in the `Compat.Sys` submodule. ([#25102])
+
 * `Associative` is now `AbstractDict` ([#25012]).
 
 * `indices` is now `axes` ([#25057]).
@@ -416,4 +418,5 @@ includes this fix. Find the minimum version from there.
 [#25021]: https://github.com/JuliaLang/julia/issues/25021
 [#25056]: https://github.com/JuliaLang/julia/issues/25056
 [#25057]: https://github.com/JuliaLang/julia/issues/25057
+[#25102]: https://github.com/JuliaLang/julia/issues/25102
 [#25162]: https://github.com/JuliaLang/julia/issues/25162

src/Compat.jl

@@ -584,6 +584,12 @@ module Sys
     else
         import Base.Sys: isapple, isbsd, islinux, isunix, iswindows
     end
+
+    @static if VERSION < v"0.7.0-DEV.3073"
+        const BINDIR = JULIA_HOME
+    else
+        const BINDIR = Base.Sys.BINDIR
+    end
 end
 
 @static if VERSION < v"0.7.0-DEV.892"

test/runtests.jl

@@ -1020,6 +1020,13 @@ end
 @test ComplexF32 === Complex{Float32}
 @test ComplexF64 === Complex{Float64}
 
+# 0.7.0-DEV.3073
+if VERSION < v"0.7.0-DEV.3073"
+    @test Compat.Sys.BINDIR == JULIA_HOME
+else
+    @test Compat.Sys.BINDIR == Sys.BINDIR
+end
+
 # 0.7.0-DEV.2915
 module Test25021
     using Compat