0.6.4

GHC-9.0 compatibility

0.6.1

• Added the --only-macros command line flag. Does not splice lines, remove comments, or do trigraph replacement. It does macro processing and #line marker output (which can be disabled with the -P option)

• Changed the default configuration to emit #line markers. Can be disabled with -P.

0.6.0

• Various bug fixes by @rahulmutt. These may change behavior not captured by the MCPP test suite.
• Switch to unordered-containers from bytestring-trie for stackage compatibility
• Internal refactoring

0.5.1

Added the expand API for pure macro processing (i.e. #includes are ignored).

0.5.0

• Redesigned library API The Hpp module exports the main pieces. Hpp.Env, Hpp.Types, and Hpp.Config may be used for configuring the preprocessor.

0.4.0

• Simplify the parsing machinery
• Don't remove C++-style single-line comments
• Don't error on unknown cpp directives Previously, a line beginning with "#-}" would cause an error
• Don't do trigraph replacement by default. Haskell allows "??" in operator names and you can be sure lens uses it!

0.3.1

Address a change wherein GHC 8 will pass -include arguments without a space between "-include" and the file to be included.

0.3

Switch to a stream processing model.

This library is designed to have minimal dependencies, so we now have a bespoke implementation of a cross between the pipes and machines libraries included.

This change was done to make some parsing operations easier, believe it or not. For example, most pre-processing is done on a line-by-line basis, but we must also support macro function applications that cross line boundaries. Thus the expansion logic can not merely be given one line at a time from an input file. Previously, a heuristic tried to combine consecutive lines before the parsing stage. Now, the parser itself is able to pull tokens in across lines when necessary.

TL;DR: The upshot is that processing /usr/include/stdio.h on OS X (a surprisingly complicated file!) now uses 78% of the time and 0.38% the memory of previous versions of hpp.

0.1

First release!