Simple rootmap file can not be read by ROOT

Hi,

I ran into a very strange issue today. While trying to debug something else, I noticed that when I build a shared library that has dictionaries for some very simple types, I'm unable to make interactive ROOT find these types automatically. Attached is a simple example.

When I build the code, I get a rootmap file with this exact content:

[ libMyTestLibrary.so ]

# List of selected classes

class MyTestClass

header MyTestClass.h

But if I try to use MyTestClass in an interactive ROOT session, that doesn't work.

[bash][tauriel]:rootRootmapError > root -l

root [0] MyTestClass c;

ROOT_prompt_0:1:12: error: expected ';' after expression

MyTestClass c;

           ^

           ;

ROOT_prompt_0:1:13: error: use of undeclared identifier 'c'

MyTestClass c;

            ^

root [1]

Looking a bit closer at it, I see the following:

[bash][tauriel]:rootRootmapError > root -l

root [0] gInterpreter->GetMapfile()->Print();

...

TMinuitMinimizer.h:       libMinuit.so                   [Changed]

gMinuit:                  libMinuit.so                   [Changed]

[:                        libMyTestLibrary.so ]          [Global]

class:                    MyTestClass                    [Global]

header:                   MyTestClass.h                  [Global]

root [1]

Something is clearly very broken here... It took a while before I could find a way to "fix" the issue. Turns out, if I add one empty line at the beginning of libMyTestLibrary.rootmap, then everything starts working. (Please try it.)

Note that as soon as there library is "more complicated", like if there's a namespace in it, then the formatting of the rootmap file changes such that it becomes "parseable". That's why I didn't run into this issue before. But clearly it's a very serious problem if we can't build such simple libraries...

Cheers,
Attila