56 lines
2.3 KiB
Plaintext
56 lines
2.3 KiB
Plaintext
All right, you want to compile AS with a K&R compiler, and I hope you
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have really thought about it before attemptimg this. Think a second
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and third time before you really go this way! The procedure is
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tedious and error-prone. I really regard K&R C as being obsolete, and
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that is why I did not provide an 'automatic' way to compile AS with a
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K&R compiler. You will probably face more problems than mentioned
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here, since K&R systems are mostly old systems that also lack library
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functions of newer systems. The K&R support is mostly here because I
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have an old PCS/Cadmus system (the first german company in the 80s
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that built Unix systems, 68k-equipped and with a very bare System V.3
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port) whose compiler is even too stupid to compile GNU-C, so the
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description will orient along the things I had to do for the Cadmus.
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This scheme however has also already worked for SunOS/Sparc with the
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old 'cc' compiler from Sun....
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1. remove the '#error' directives from 'sysdefs.h' - K&R
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preprocessors do not know them.
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2. construct an appropriate 'Makefile.def' for your system. Since
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most older systems do not define OS-specific symbols, you might
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have to define them yourself and correlate them to what you query
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in 'sysdefs.h' for your system. For a K&R compiler, '-Dsigned=
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-Dconst=' is a good start to remove ANSI extensions. For the
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Cadmus, I also had to to add '-Dvoid=int' because the compiler's
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void datatype was broken.
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3. There is a tool called 'a2k' to convert ANSI sources (headers &
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c-files) to K&R style. This mainly involves removing the
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prototypes. Don't think this is a general ANSI-->K&R converter,
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since it heavily depends on my way of formatting C sources and
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some additional differences are handled in the sources themselves
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via __STDC__ queries! To build a2k, a simple 'make a2k' should
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suffice.
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4. Convert all header files to K&R, like in the following:
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for i in *.h; do
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cp $i $i.ansi
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a2k $i.ansi $i
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done
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5. Change the Makefile so that a2k is called as a preprocessor to the
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compiler. The simplest way is to modify the implicit rule:
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.c.o:
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a2k $*.c tmp.c
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$(CC) $(ALLFLAGS) -c tmp.c
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mv tmp.o $*.o
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rm -f tmp.c
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6. Type 'make' and pray...
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One more thing: older Unix systems do not know symbolic links, so a manual
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'cp tests/t_secdrive/wd1003at.inc cp tests/t_secdrive/lowlevel.inc' might be
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necessary...
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