[Gmsh] output geo by command line

[Zong]

Hello all,

I am trying to read a .step file into gmsh and save as a unrolled geo
file. Everything worked fine under GUI. When I tried to use command
line by "gmsh -0 xxxx.step" , it did prompt "STEP Loading done : 1486
Entities" and " Info    : Done writing 'xxxx.geo_unrolled'"  .
However, the file xxxx.geo_unrolled only contained one line: "cl1 =
1e+22;" without any geometry entries.
Is it a bug or I missed something ?
The problem was found on both 2.6.1 mac and windows build.

Zong