Zlib.h and zconf.h bug

ROOT
1

Every time I try the following:

#include <zlib.h>

I get the following error message:

Limitation: can not handle macro ZEXTERN extern Use +P or -p option FILE:/home/gamma/root/include/zconf.h LINE:239

I have tried more than one version of root including the latest version.

2

Hi,

If you are trying for the command prompt … just don’t (it would not give you access to the function its defines anyway … unless I am mistaken on the ‘zlib.h’ you are refering to.
If you are trying from rootcint, modify your command from

[quote]rootcint -f mydict.cxx -c myfile.h mylinkdef.h[/quote]to

Cheers,
Philippe.

3

I may be in the wrong forum. I was trying to include zlib.h from root, not rootcint. I have had no problems including other files such as iostream.h and iomanip.h. The error is occurring at the following lines:

#ifndef ZEXTERN

define ZEXTERN extern

#endif

This is from the zconf.h file that was included with root.

4

Hi,

ROOT currently does not provide access from the prompt to the compiled method declared in zlib.h.

What is your purpose in trying to include zconf.h or zlib.h (if I understand what you are ultimately trying to do, I might be able to be more specific and helpfull in my comments :slight_smile: ).

If you need to process an include file that include them you may have to code guard them:

#ifndef __CINT__ #include <zlib.h> #endif

If you need to access the function defined in them, you need load them via ACLiC (so that it generates the appropriate dictionary:

Cheers,
Philippe.

5

Hello,

I can introduce a feature that takes care of define macro like this.

#define ZEXTERN extern

For the time being, you can not erase it once you’ve load it. This should be fine for makecint/rootcint.

Thank you
Masa Goto

6

I have a code from someone else called dump_data.cc that converts the raw data into ascii. The problem is that the data files are over 100 MB each in ascii, so I am trying to histogram the data without making the ascii files.

Within the dump_data.cc file, there is a command,

gzread(in,&x,sizeof(unsigned long));

which reads in a block of data from the raw data file and stores the value in x. If I could find another function to replace gzread, then I would not have to include zlib.h.

Btw, I am using the commands,

.L dump_data.cc
main()

7

Hi,

The best for you (simpliest to use and actually fastest to run) is to rename your main function into something else (for example dump_data() ) and do

.L dump_data.cc+ main()
Note the additional charater ‘+’.

Cheers,
Philippe,.

8

Thanks, the original code runs correctly now. I assume that the ‘+’ means that ROOT will compile the code first and make an executable with a ‘.so’ extension.

The only problem I have now is that ROOT functions, such as TH1F and TCanvas, are not recognized by the compiler. So, I get errors saying that they are undeclared functions.

I am going to need to histogram the results as the program loops through each data block to avoid the necessity of outputting to a file first.

9

Indeed (see User’s Guide for more information on ACLiC).

Add the proper #include statements. As you mentioned this is now compiled as typical C++.

Cheers,
Philippe.