# Frequently Asked Questions

## Contents

- How do I handle conditional compilation?
- How can I handle automatically generated files?
- How can I save an identifier or file query?
- Why aren't my call graphs appearing in the form I specified?
- How can I manually convert a CScout project to obtain its preprocessed output with cscout -E?
- How can I locate and fix a syntax error?
- Why is my read-only prefix pragma not working under Windows?
- My system appears to be using the hard disk excessively (thrashing). Why?
- Why can't I see SVG call graphs in my browser?
- Isn't the CScout logo infringing the intellectual property of the International Scout movement?
- When does CScout phone home?
- What details does CScout send when calling its home base?

## How do I handle conditional compilation?

You can either define macros that will cover all conditional cases, or process the same project multiple times using different macro definitions. See this page.

## How can I handle automatically generated files?

Some projects use mini domain-specific languages similar to yacc and lex to express some of their elements. CScout can natively parse C and yacc source files, but no other language. Obviously changes should be performed in the original domain-specific files, rather than the generated C code. On the other hand, CScout can not parse the original files, but can parse the generated code. To escape this situation include the automatically generated file in your workspace definition, but define it as read-only. In this way CScout will not allow you to modify identifiers appearing in it.

## How can I save an identifier or file query?

Simply bookmark the page that shows the query's results. You can even pass the URL around or print it on a T-shirt; the URL contains the whole query.

## Why aren't my call graphs appearing in the form I specified?

Changing the global options that specify the format of call graphs affects the types of links appearing in the corresponding pages. If you go to a previous page using the back button and you do not reload it, you will use the old links and will obtain the old type of call graph. This is the only instance where the use of the back button will surprise you.

## How can I manually convert a CScout project to obtain its preprocessed output with cscout -E?

- Isolate from the cscout build script the commands for the specific file. These are delimited by the innermost `#pragma block_enter` and `#pragma block_exit` commands.
- Save the fragment to a separate CScout script file, say problem.cs.
- Change in problem.cs the `#pragma process` filename sequence with `#include` filename.
- Run

      cscout -E problem.cs >preprocessed.c

## How can I locate and fix a syntax error?

Most syntax errors occur due to compiler extensions or incorrect definitions of macros. They can often be corrected, by introducing a dummy macro that gets around the corresponding compiler extension, like the following.

    #define __declspec(x)

If the problem isn't obvious from the source code, you might need preprocess the file and look at the preprocessed code. To do this search in the preprocessed code for an (ideally unique) occurrence of non-macro code near the problem spot.

## Why is my read-only prefix pragma not working under Windows?

Filename matching under Windows is a difficult subject. Filenames retain case, but are compared in a case insensitive manner. To avoid problems, when writing `ro_prefix` and `ipath` pragmas under a Windows platform, respect the following rules.

- Include a drive letter in the path.
- Write the drive letter in uppercase.
- Separate the path elements using a single backslash.
- Do not end the path with a trailing backslash.

## My system appears to be using the hard disk excessively (thrashing). Why?

CScout tags and follows each and every identifier of the source code it processes, including header files. As a result, the memory requirements of CScout are considerable. Typical memory requirements are 700-1600 bytes per line processed. If your system's main memory is less than the ammount needed, CScout will page to disk and thrashing will occur.

## Why can't I see SVG call graphs in my browser?

Make sure your browser supports SVG viewing. For instance, Firefox and Internet Explorer work fine; SeaMonkey doesn't.

## Why doesn't the Tab key in the Safari browser allow me to move to each identifier definition?

Press `Option` (or `Alt`) `Tab`, instead of Tab. You can also permanently change Safari's behavior under Safari - Preferences - Advanced.

## Isn't the CScout logo infringing the intellectual property of the International Scout movement?

The emblem of the International Scout movement is based on the fleur de lys, a traditional design of the 11th century that was later used to decorate maps and compass cards. CScout acts as a compass and a map for C code, so the association with the fleur de lys is particularly relevant. You can read more about the fleur de lys symbol at the Wikipedia web site entry. Places or institutions that use the symbol informally or as part of their heraldic arms are: Quebec; Canada; Augsburg, Germany; Florence, Italy; Slovenia; the Fuggers medieval banking family; Bosnia and Herzegovina; and Louisville, Kentucky; the Prince of Wales also has a fleur de lys on his coat of arms. A Google image search for the image will also show you tens of similar designs. Finally, note that the International Scout movement's rendering of the image includes two stars on the left and right leaves. CScout's logo does not contain this distinctive feature.

## When does CScout phone home?

CScout will contact its home base after processing 2MB of source code (including headers), or if the processing time exceeds 10s. These limits allow you to process the supplied awk source code, or experiment with files including windows.h

## What details does CScout send when calling its home base?

Your name, address, and credit card number :-)

Seriously, the data sent to our server consists of

- your workspace's file metrics
- your workspace's identifier metrics
- up to 10 project names you have specified
- up to 50 names of cross-file identifiers
- the version of CScout you are running
- your host name
- a random number, part of a simple challenge-response authentication.

The authentication system is really a child's toy, even an idiot would be able to hack it, so don't bother.

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