Request: more descriptive error for "ccall: wrong number of arguments to C function"

[mcb0035]

When ccall is passed an unexpected number of arguments, it would be useful to know which function it is trying to call and what arguments it expects vs. what it gets. For example,

ccall: wrong number of arguments to C function foo
expected (bar, baz), received (bar, bar, baz)

Or something like that. I am looking at ccall.cpp, but if anyone already familiar with the Julia internals can do it better and faster that would be great.

Some ccalls started failing with this error while trying to work around #19774, but without this information it is hard to tell why.

[vtjnash]

should be largely fixed by https://github.com/JuliaLang/julia/pull/18754/files#diff-ab8c4a99930a43168794a7bd3b8bfa91R94

[thofma]

Is this fixed? I am on

julia> versioninfo()
Julia Version 0.6.0-dev.2634
Commit 754757c* (2017-02-07 15:55 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Core(TM) i7 CPU         860  @ 2.80GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Nehalem)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, nehalem)

and I get

WARNING: ccall: wrong number of arguments to C function in Module

after using Module.

[vtjnash]

This error is now thrown as soon as it occurs so the backtrace information should be useful now.