eliminate white space at the end of line

Hi Folks,
I have following questions need your help. I need to tweak gcc 2.95.3. For GCC 2.95.3, when the compiler see a white space after the line continuation character '\' it will give me errors. GCC3 this will give an warning. I need to implement the same functionality in GCC2.95.3.
Following is the code: (There is an whitespace at the end of '\'
----------------
#define max(a,b) (a>b)? \
a:b
int main()
{
return 1;
}
----------------
GCC2.95.3 complains:

line.c:4: parse error before `>'
line.c:14: stray '\' in program
line.c:14: parse error before `;'

GCC3.0 give warnings,but still compiles.
line.c:3:14: warning: backslash and newline separated by space

I think the following would be the approach:
(1) use perl to pre process the .h/.c file.
This will slow down the compiling speed. So it not recommendated.
(2) tweak the pre-processor c-syntax file such as c-parse.c/clex.c to allow white space at the end of line continuation character.
I think this is a better way. But I can not locate the place to add
this rule in the c syntax file. Generally speaking the Flex program will use the .l file to define language syntax, but I can not find any file with extension 'l'. Is the syntax file defined in c-parse.y? Where can I add this rule to let gcc eat the extra whitespaces ?


Could you please help me ?
Thanks a lot.

-Jack Zhang