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Old 05 August 2020, 23:02   #1
FirstNE
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Standard C libraries? aka fopen,fread,fwrite

I am using fopen, fread, fwrite in my code which compiles ok using vbcc, but the linker complains I'm missing _open,_read,_write. Anyone know what the missing library is called?\ or where I might find it?
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Old 06 August 2020, 00:35   #2
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It looks like you compile for an embedded system and not AmigaOS.
What is your compilation params provided to vbcc?
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Old 06 August 2020, 08:00   #3
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Posixlib. See Aminet.
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Old 06 August 2020, 11:26   #4
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open(), read() and write() are not part of the ISO-C standard, so you cannot expect them to be in a C library, and really portable C code would not use them.

These are Unix system calls and conform to the POSIX standard. Some C libraries emulate them to simplify porting of Unix sources, but vbcc does not. See Hedeon's reply for an alternative.

The intention behind that is to enforce clean ISO-C code as much as possible, so you can be sure that a source which compiles with vbcc should compile with any ISO-C compliant compiler.
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Old 06 August 2020, 11:46   #5
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OP said he tried using fopen, fread, fwrite. (and got linking errors on _open etc)

I think those are standard lib as of C89.

Docent's approach sounds more logical to me.
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Old 06 August 2020, 17:40   #6
FirstNE
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Quote:
Originally Posted by Docent View Post
It looks like you compile for an embedded system and not AmigaOS.
What is your compilation params provided to vbcc?

Here's the makefile:


OBJECTS = morale.o move.o report.o gun_fire.o gun_load.o main.o

game: $(OBJECTS)
vc +aos68k -lvc -O2 -I$(NDK_INC) -o game $(OBJECTS) -lmieee -lauto -lamiga

main.o: main.c common.h /lib/ship.h /lib/country.h /lib/guns.h
morale.o: morale.c common.h /lib/ship.h /lib/guns.h
move.o: move.c common.h /lib/ship.h
report.o: report.c common.h /lib/ship.h
gun_fire.o: gun_fire.c common.h /lib/ship.h /lib/guns.h
gun_load.o: gun_load.c common.h /lib/ship.h /lib/guns.h
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Old 06 August 2020, 17:46   #7
FirstNE
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Quote:
Originally Posted by Hedeon View Post
Posixlib. See Aminet.

Yes, this looks like what I am looking for. Will test it out in a while...

Edit: yes, this did the trick! Thank you!

Last edited by FirstNE; 06 August 2020 at 19:38.
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Old 06 August 2020, 20:25   #8
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Quote:
Originally Posted by FirstNE View Post
vc +aos68k -lvc -O2 -I$(NDK_INC) -o game $(OBJECTS) -lmieee -lauto -lamiga
You should better not write -lvc there. There is also no need for it.
  1. As long as you don't give the -nostdlib option the frontend will always link with vc.lib automatically, after all other libraries on the command line.
  2. You may want to, or even need to, replace functions from vc.lib, which only works when the linker sees them in objects/libs which appear earlier. For example the math libraries (like mieee.lib) would replace the printf-like functions in vc.lib, to add floating-point support to them (%f, %g, etc.).
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Old 07 August 2020, 22:05   #9
FirstNE
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OK, thanks! Back in the day I used SAS/C so it's an adventure in using vbcc.
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