Port GNU Compiler Collection (gcc) to HelenOS

[Jakub Jermář]

Port the GNU Compiler Collection to HelenOS.

Details

HelenOS already contains a simple C compiler in the form of the Portable C Compiler (pcc) which was ported to it during GSoC 2011. pcc is sufficient for compiling simple userspace programs under HelenOS/ia32, but unfortunately is not powerful enough to build the entire HelenOS without substantial modifications in places where pcc does not follow gcc close enough. Which is worse, pcc does not support the full range of platforms supported by HelenOS, which makes it a non-starter for the use as the main HelenOS compiler (both cross and native). This last criterion basically leaves us with only gcc as the only choice for achieving our long-term goal of becoming self-hosting.

The goal of this project is to port at least the C compiler part of gcc to HelenOS.

What Gains and Benefits will this bring?

One of the strategic goals for HelenOS is becoming self-hosting. Since most of the HelenOS code is written in C, having a portable, full-fledged native C compiler is a prerequisite to reaching this goal. Using the same compiler for cross-compilation and building HelenOS from itself is also a benefit of its own.

Difficulty

Medium. The effort will be somewhat easier especially thanks to GSoC 2011 projects that have paved the way for this project by porting GNU binutils and the Portable C Compiler to HelenOS and creating a POSIX-compatibility library.

Required skills

A successful applicant will have good skills of programming in the C language and the ability to survive in a non-standard non-POSIX application environment. The applicant should also be familiar with the basic concepts behind compilers and the build toolchain.

Documentation

• DeveloperDocs
• ​GCC, The GNU Compiler Collection

Possible mentors

HelenOS Core Team, Jakub Jermar, Jiri Svoboda

[Jiri Svoboda]

Development branch: ​https://code.launchpad.net/~vivek-cs-iitr/helenos/gcc

[Jiří Zárevúcky]

Any progress on this, or is the project dead?

[Martin Decky]

Vivek Prakash did not pass GSoC midterm evaluation. AFAIK nobody is actively working on this ticket at present time.

[Jiri Svoboda]

As of 2012-08-14 the cxx-conversion branch was merged to GCC trunk. This means GCC is now implemented in C++ instead of C. For us this places a new obstacle, for next GCC version to work on HelenOS some C++ runtime support would probably have to be implemented.

[Hesham]

I am interested in this project, is it ok to begin analyzing and reading docs and then begin implementation or there are somethings i should know about first ?

[Jakub Jermář]

Yes, I guess this project is not being actively worked on by anybody. So it is open for any potential takers.

[Jakub Jermář]

There is now a basic gcc port in coastline.