What is flex in compiler construction?

Flex (fast lexical analyzer generator) is a free and open-source software alternative to lex. It is a computer program that generates lexical analyzers (also known as “scanners” or “lexers”).

What are flex files used for?

Description. flex is a tool for generating scanners: programs which recognized lexical patterns in text. flex reads the given input files, or its standard input if no file names are given, for a description of a scanner to generate. The description is in the form of pairs of regular expressions and C code, called rules …

How do I compile faster in Intellij?

Speed up Flex Compilation!

1. Make Project (Ctrl+F9): compile all modules incrementally (if possible), do not compile up-to-date modules.
2. Rebuild Project on the Build menu: force full non-incremental compilation of all modules.

How does flex scanner work?

flex is a tool for generating scanners: programs which recognize lexical patterns in text. flex reads the given input files (or its standard input if no file names are given) for a description of the scanner to generate. When the executable runs, it analyzes its input for occurrences of the regular expressions.

What can be used to speed up compilation times?

Take a look at the Pimpl idiom here, and here, also known as an opaque pointer or handle classes. Not only does it speed up compilation, it also increases exception safety when combined with a non-throwing swap function. The Pimpl idiom lets you reduce the dependencies between headers and reduces the amount of recompilation that needs to be done.

How to do flex compilation in project view?

But Ctrl+Shift+F9 on Flex module (or module with Flex facet) at Project View compiles the whole module according to Flex Compiler Settings for this module (facet). Use Ctrl+Shift+F10 to quickly run test(s) at cursor.

How to speed up C + + compiler compilation time?

Although there is no proven correlation between the symbol lengths and compilation time, we have observed that smaller average symbol sizes can improve compilation time on all compilers. So your first goals it to find the largest symbols in your code. You can use the nm command to list the symbols based on their sizes:

What’s the meaning of speedup in computer architecture?

In computer architecture, speedup is a number that measures the relative performance of two systems processing the same problem.