Without using Libdl building SpecialFunctions fails on Julia-dev

[chriselrod]

Pkg.build("SpecialFunctions")
[ Info: Building SpecialFunctions
┌ Warning: `info()` is deprecated, use `@info` instead.
│   caller = top-level scope at <missing>:10
└ @ Core <missing>:10
INFO: Building openspecfun from source by request
ERROR: LoadError: LoadError: UndefVarError: Libdl not defined
Stacktrace:
 [1] top-level scope
 [2] include at ./boot.jl:292 [inlined]
 [3] include_relative(::Module, ::String) at ./loading.jl:521
 [4] include at ./sysimg.jl:26 [inlined]
 [5] include(::String) at /home/chris/.julia/v0.7/BinDeps/src/BinDeps.jl:3
 [6] top-level scope
 [7] include at ./boot.jl:292 [inlined]
 [8] include_relative(::Module, ::String) at ./loading.jl:521
 [9] include(::Module, ::String) at ./sysimg.jl:26
 [10] top-level scope
 [11] eval at ./boot.jl:295 [inlined]
 [12] top-level scope at ./<missing>:2
in expression starting at /home/chris/.julia/v0.7/BinDeps/src/dependencies.jl:636
in expression starting at /home/chris/.julia/v0.7/BinDeps/src/BinDeps.jl:583
┌ Error: ------------------------------------------------------------
│ # Build failed for SpecialFunctions
│   exception =
│    LoadError: LoadError: Failed to precompile BinDeps to /home/chris/.julia/lib/v0.7/BinDeps.ji.
│    Stacktrace:
│     [1] error at ./error.jl:33 [inlined]
│     [2] compilecache(::String) at ./loading.jl:648
│     [3] compilecache at ./loading.jl:605 [inlined]
│     [4] _require(::Symbol) at ./loading.jl:440
│     [5] require(::Symbol) at ./loading.jl:333
│     [6] include at ./boot.jl:292 [inlined]
│     [7] include_relative(::Module, ::String) at ./loading.jl:521
│     [8] include at ./sysimg.jl:26 [inlined]
│     [9] include at ./loading.jl:555 [inlined]
│     [10] top-level scope at ./<missing>:11
│     [11] include at ./boot.jl:292 [inlined]
│     [12] include_relative(::Module, ::String) at ./loading.jl:521
│     [13] include at ./sysimg.jl:26 [inlined]
│     [14] include(::String) at ./loading.jl:555
│     [15] top-level scope
│     [16] eval at ./boot.jl:295 [inlined]
│     [17] eval at ./sysimg.jl:71 [inlined]
│     [18] evalfile(::String, ::Array{String,1}) at ./loading.jl:550 (repeats 2 times)
│     [19] #2 at ./none:12 [inlined]
│     [20] cd(::getfield(, Symbol("##2#5")){String}, ::String) at ./file.jl:70
│     [21] (::getfield(, Symbol("##1#3")))(::IOStream) at ./none:11
│     [22] open(::getfield(, Symbol("##1#3")), ::String, ::String) at ./iostream.jl:310
│     [23] top-level scope
│     [24] eval at ./boot.jl:295 [inlined]
│     [25] eval(::Module, ::Expr) at ./sysimg.jl:71
│     [26] process_options(::Base.JLOptions) at ./client.jl:301
│     [27] _start() at ./client.jl:375
│    in expression starting at /home/chris/.julia/v0.7/SpecialFunctions/deps/scratch.jl:3
│    in expression starting at /home/chris/.julia/v0.7/SpecialFunctions/deps/build.jl:6
└ @ Main none:15
┌ Warning: ------------------------------------------------------------
│ # Build error summary
│ 
│ SpecialFunctions had build errors.
│ 
│  - packages with build errors remain installed in /home/chris/.julia/v0.7
│  - build the package(s) and all dependencies with `Pkg.build("SpecialFunctions")`
│  - build a single package by running its `deps/build.jl` script
└ @ Base.Pkg.Entry entry.jl:656

julia> libc_ptr = ccall(:jl_dlopen, Ptr{Cvoid}, (Ptr{Cvoid}, UInt32), C_NULL, 0)
Ptr{Nothing} @0x00007f7f62f68150

julia> glibc_ptr = Libdl.dlsym_e(libc_ptr, :gnu_get_libc_version)
ERROR: UndefVarError: Libdl not defined

julia> using Libdl

julia> glibc_ptr = Libdl.dlsym_e(libc_ptr, :gnu_get_libc_version)
Ptr{Nothing} @0x00007f7f61bf52d0

julia> versioninfo()
Julia Version 0.7.0-DEV.3393
Commit c5cd13ebe3* (2018-01-13 05:40 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz
  WORD_SIZE: 64
  BLAS: libmkl_rt
  LAPACK: libmkl_rt
  LIBM: libimf
  LLVM: libLLVM-3.9.1 (ORCJIT, haswell)
Environment:

Edit:
Adding using Libdl to SpecialFunctions/deps/build.jl alone is not enough to fix the problem. I also had to add it to BinDeps, but then I got LoadError: LoadError: UndefVarError: pushfront! not defined.

Because I couldn't find anything about a Julia function called pushfront!, and the error occurred in deps/binaries.jl, I set ENV["JULIA_SPECIALFUNCTIONS_BUILD_SOURCE"] = true and SpecialFunctions built just fine.
Builds just fine, but it wont precompile.

Then the problem was:

julia> @checked_lib openspecfun "/home/chris/.julia/v0.7/SpecialFunctions/deps/usr/lib/libopenspecfun.so"
ERROR: LoadError: UndefVarError: Libdl not defined
Stacktrace:
 [1] @checked_lib(::LineNumberNode, ::Module, ::Any, ::Any) at /home/chris/.julia/v0.7/SpecialFunctions/deps/deps.jl:8
in expression starting at REPL[6]:1

So I edited `/deps/deps.jl' from:

macro checked_lib(libname, path)
    ((VERSION >= v"0.4.0-dev+3844" ? Base.Libdl.dlopen_e : Base.dlopen_e)(path) == C_NULL) && error("Unable to l$
    quote const $(esc(libname)) = $path end
end

# Load dependencies
@checked_lib openspecfun "/home/chris/.julia/v0.7/SpecialFunctions/deps/usr/lib/libopenspecfun.so"

to:

using Libdl
macro checked_lib(libname, path)
    ((VERSION >= v"0.4.0-dev+3844" ? Libdl.dlopen_e : Base.dlopen_e)(path) == C_NULL) && error("Unable to l$
    quote const $(esc(libname)) = $path end
end

# Load dependencies
@checked_lib openspecfun "/home/chris/.julia/v0.7/SpecialFunctions/deps/usr/lib/libopenspecfun.so"

Now everything works on my computer.
This is still an issue instead of a pull request, because there is probably a much cleaner way to fix the problem. (Short term when Compat updates?)
Eg, the file deps/deps.jl seems to have been created by the install process, so I would have to look into that.