> I want to use Haskell files with #ifdef, #else and #endif preprocessor
> directives. I tried hugs -F "cpp -P" <source_file_name> but cpp complains
> about unterminated character constants. What is wrong?
ANSI C preprocessors tend to get confused by the quotes in
lines like the following:
f x = x' where x' = ...
g x = x'
where
x' = ...
You can often avoid this by putting cpp in 'K&R mode'.
For example, GNU cpp accepts '-traditional'.
I'm attaching a shell script you might use (from end of hugs98/Install in the
Hugs98 distribution). (Not tested recently but ought to work.)
--
Alastair Reid haskell-consulting.com
eval "exec perl -S $0 $*"
if $running_under_some_random_shell;
#
# Reads CPP output and turns #line things into appropriate Haskell
# pragmas. This program is derived from the "hscpp" script
# distributed with the Glasgow Haskell Compiler.
#
$Cpp = 'gcc -E -xc -traditional';
open(INPIPE, "$Cpp @ARGV |") || die "Can't open C pre-processor pipe\n";
while (<INPIPE>) {
# line directives come in flavo[u]rs:
# s/^#\s*line\s+\d+$/\{\-# LINE \-\}/; IGNORE THIS ONE FOR NOW
s/^#\s*line\s+(\d+)\s+(\".+\")$/\{\-# LINE \1 \2 \-\}/;
s/^#\s*(\d+)\s+(\".*\").*/\{\-# LINE \1 \2 \-\}/;
print $_;
}
close(INPIPE) || exit(1); # exit is so we reflect any errors.
exit(0);
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