What does this warning mean?

[Peter Simons]

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My egcs warns me and I don't have the slightest idea what he's
complaining about. I am compiling a C++ class which models regular
expressions in C++. When compiling with "-Wall -ansi -pedantic -O2", I
get the following warnings:

 | RegExp.hpp:74: warning: default argument given for parameter 3 of `
 |         bool RegExec(const class string &, const class RegExp &, 
 |         struct regmatch_t * = 0, size_t = 0, int = 0)'
 | RegExp.hpp:70: warning: after previous specification in `
 |         bool RegExec(const class string &, const class RegExp &, 
 |         struct regmatch_t * = 0, size_t = 0, int = 0)'
 | RegExp.hpp:74: warning: default argument given for parameter 4 of `
 |         bool RegExec(const class string &, const class RegExp &, 
 |         struct regmatch_t * = 0, size_t = 0, int = 0)'
 | RegExp.hpp:70: warning: after previous specification in `
 |         bool RegExec(const class string &, const class RegExp &, 
 |         struct regmatch_t * = 0, size_t = 0, int = 0)'
 | RegExp.hpp:74: warning: default argument given for parameter 5 of `
 |         bool RegExec(const class string &, const class RegExp &, 
 |         struct regmatch_t * = 0, size_t = 0, int = 0)'

Can anyone explain me what egcs is complaining about? This warning
occurs only when compiling with -O2. Normal "-Wall -ansi -pedantic"
doesn't give this warning.

I am using egcs-2.92.00 if that matters. I can also provide the exact
files that produce this here on NetBSD/i386 1.3.

Any help is appreciated.

	-peter

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