Bug in GNU CPP option handling (gcc-2.95.[123])

[Neil Booth]

Peter Breitenlohner wrote:-

> Contrary to what the cpp man-page, cpp.info, as well as 'cpp --help'
> say, cpp (from gcc-2.95.1, .2, and .3) does NOT accept the option
> '-undef'!! (for ix86-linux-gnu).

Hmm.  2.95 works for me; though I agree the documentation about its
effects is not particularly clear (or accurate):-

monkey:gcc{17}$ /usr/bin/cpp-2.95 -undef -v /dev/null
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20010502 (Debian prerelease)
 /usr/lib/gcc-lib/i386-linux/2.95.4/cpp0 -lang-c -v -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ /dev/null
GNU CPP version 2.95.4 20010502 (Debian prerelease) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc-lib/i386-linux/2.95.4/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3
 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../i386-linux/include
End of omitted list.
# 1 "/dev/null"

monkey:gcc{18}$ /usr/bin/cpp-2.95 -v /dev/null
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20010502 (Debian prerelease)
 /usr/lib/gcc-lib/i386-linux/2.95.4/cpp0 -lang-c -v -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ /dev/null
GNU CPP version 2.95.4 20010502 (Debian prerelease) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc-lib/i386-linux/2.95.4/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3
 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../i386-linux/include
End of omitted list.
# 1 "/dev/null"
monkey:gcc{19}$ 

Note the set of predefined macros is different.

Neil.