RISC OS Open: Forum: C compilers

Dec 2, 2020 3:51pm

David Boddie (1934) 222 posts

In the WIMP2 integration topic, DavidS wrote:

I do wish we had a quick and dirty (minimally optimizing) C Compiler available to get the intermediate work done without spending so much time in compiling.

There was LCC up until a certain point.

The Inferno C compiler (the linker, actually) can theoretically produce AIF binaries – see this file for a bit more information. It’s not what you might call a “modern” C compiler, however.

Dec 2, 2020 4:31pm

David Boddie (1934) 222 posts

LCC 4.20 is apparently 32-bit.

Dec 2, 2020 6:02pm

Steve Pampling (1551) 8172 posts

If you do not mind me asking, where did you see documented that it is 32-bit?

Well any way around the source is available.

Dec 2, 2020 6:20pm

David Boddie (1934) 222 posts

If you do not mind me asking, where did you see documented that it is 32-bit?

On the riscos.info page it says “The current 4.20 32-bit release” above “The previous 4.10 26-bit releases” so I assume that it’s 32-bit not 26-bit.

Dec 2, 2020 7:57pm

Steve Pampling (1551) 8172 posts

Given the age, if it uses UnixLib then it’s probably got a few ARMv7+ issues too (using SWP perhaps)

Feb 28, 2021 4:06pm

Roy Sutcliffe (8385) 3 posts

I’ve been playing with LLC this week and like DavidS found that it stopped with an error referring to

lccpath:bin.rcc: can’t write `/tmp/llcxxxxxx.s`.

After a bit of searching I found /tmp/ is a pointer to the directory




 !Boot.Resources.!Scrap.ScrapDirs.ScrapDir

and the reason it comes up with this message is rcc can’t create it’s directory s in ScrapDir. If you create it and run lcc again you will find it compiles no problem. LCC uses three directories i, s and o, it can create the other two itself but not s. Hope this helps

Mar 1, 2021 11:40am

Roy Sutcliffe (8385) 3 posts

Thanks, I’m glad I could help. I hadn’t realised when I posted this that half the path was missing due to Textile using the pling character for formatting, glad you could figure it out. I’ve sorted it now.

I’ve decided to have another look at C, I originally learned it on the Amiga in the early 90’s but didn’t do much with it and had one or two abortive attemts since so I’ve dug out my old Kernighan and Richie, and found a PDF of The C answer Book for when I get stuck. LCC works well on a Raspberry Pi 1B and StrongArm is a nice editor to work with. I’m glad I found this post and found out about LCC, it’s light not too complicated and doesn’t need a load of memory just to compile Hello World!

Incidentally I figured out how to find the path from the source code, there’s a lot of documents in the root directory and one described how to use LCC -v to find the various paths, LCC -v /tmp/ refers to <Wimp$ScrapDir>, type in echo <Wimp$ScrapDir> gives the path.

Mar 2, 2021 9:20am

Roy Sutcliffe (8385) 3 posts

Thank you. That’s interesting, I’m a bit of a newbie with RISCOS and I like to know how OS’s work. Before this I had hardly seen ScrapDir mentioned, only when I tried running WinEd in Dr Wimp and it crashed saying it left a file in ScrapDir.

Mar 2, 2021 8:18pm

Steve Pampling (1551) 8172 posts

Thanks, I’m glad I could help. I hadn’t realised when I posted this that half the path was missing due to Textile using the pling character for formatting, glad you could figure it out.

At the bottom of this page (when writing) is a bit of text "See also the Textile reference here. "
The here is a link.
HTH

Mar 12, 2021 12:43pm

JamesCampbell (8791) 1 post

Never knew how to migrate an OS to RISC OS it will be interesting to watch!

Mar 22, 2021 3:00pm

alban read (2898) 20 posts

re: C compilers
A newish (2017 to today) open source (BSD) C compiler (framework) created by Alibaba.com is here:
https://github.com/stevenknown/xoc
It appears to already turn C99 code into ARM assembly listings; with a lot of optional optimizations.
The compiler is written in C++ and can be built with gcc on Linux at least.
“Tailoring and retargeting the compiler is easy, and fun.”

C compilers

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Dec 2, 2020 3:51pm David Boddie (1934) 222 posts	In the WIMP2 integration topic, DavidS wrote: I do wish we had a quick and dirty (minimally optimizing) C Compiler available to get the intermediate work done without spending so much time in compiling. There was LCC up until a certain point. The Inferno C compiler (the linker, actually) can theoretically produce AIF binaries – see this file for a bit more information. It’s not what you might call a “modern” C compiler, however.

Dec 2, 2020 4:31pm David Boddie (1934) 222 posts	LCC 4.20 is apparently 32-bit.

Dec 2, 2020 6:02pm Steve Pampling (1551) 8172 posts	If you do not mind me asking, where did you see documented that it is 32-bit? Well any way around the source is available.

Dec 2, 2020 6:20pm David Boddie (1934) 222 posts	If you do not mind me asking, where did you see documented that it is 32-bit? On the riscos.info page it says “The current 4.20 32-bit release” above “The previous 4.10 26-bit releases” so I assume that it’s 32-bit not 26-bit.

Dec 2, 2020 7:57pm Steve Pampling (1551) 8172 posts	Given the age, if it uses UnixLib then it’s probably got a few ARMv7+ issues too (using SWP perhaps)

Feb 28, 2021 4:06pm Roy Sutcliffe (8385) 3 posts	I’ve been playing with LLC this week and like DavidS found that it stopped with an error referring to lccpath:bin.rcc: can’t write `/tmp/llcxxxxxx.s`. After a bit of searching I found /tmp/ is a pointer to the directory `!Boot.Resources.!Scrap.ScrapDirs.ScrapDir` and the reason it comes up with this message is rcc can’t create it’s directory s in ScrapDir. If you create it and run lcc again you will find it compiles no problem. LCC uses three directories i, s and o, it can create the other two itself but not s. Hope this helps

Mar 1, 2021 11:40am Roy Sutcliffe (8385) 3 posts	Thanks, I’m glad I could help. I hadn’t realised when I posted this that half the path was missing due to Textile using the pling character for formatting, glad you could figure it out. I’ve sorted it now. I’ve decided to have another look at C, I originally learned it on the Amiga in the early 90’s but didn’t do much with it and had one or two abortive attemts since so I’ve dug out my old Kernighan and Richie, and found a PDF of The C answer Book for when I get stuck. LCC works well on a Raspberry Pi 1B and StrongArm is a nice editor to work with. I’m glad I found this post and found out about LCC, it’s light not too complicated and doesn’t need a load of memory just to compile Hello World! Incidentally I figured out how to find the path from the source code, there’s a lot of documents in the root directory and one described how to use LCC -v to find the various paths, LCC -v /tmp/ refers to <Wimp$ScrapDir>, type in echo <Wimp$ScrapDir> gives the path.

Mar 2, 2021 9:20am Roy Sutcliffe (8385) 3 posts	Thank you. That’s interesting, I’m a bit of a newbie with RISCOS and I like to know how OS’s work. Before this I had hardly seen ScrapDir mentioned, only when I tried running WinEd in Dr Wimp and it crashed saying it left a file in ScrapDir.

Mar 2, 2021 8:18pm Steve Pampling (1551) 8172 posts	Thanks, I’m glad I could help. I hadn’t realised when I posted this that half the path was missing due to Textile using the pling character for formatting, glad you could figure it out. At the bottom of this page (when writing) is a bit of text "See also the Textile reference here. " The here is a link. HTH

Mar 12, 2021 12:43pm JamesCampbell (8791) 1 post	Never knew how to migrate an OS to RISC OS it will be interesting to watch!

Mar 22, 2021 3:00pm alban read (2898) 20 posts	re: C compilers A newish (2017 to today) open source (BSD) C compiler (framework) created by Alibaba.com is here: https://github.com/stevenknown/xoc It appears to already turn C99 code into ARM assembly listings; with a lot of optional optimizations. The compiler is written in C++ and can be built with gcc on Linux at least. “Tailoring and retargeting the compiler is easy, and fun.”