Please describe the problem:
I compiled Libxml2 2.6.22 and CVS-head revision on Windows by VC6 SP6 and found
out a bunch of warnings are reported (this is for CVS):

xmlregexp.c
..\xmlregexp.c(6878) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6878) : warning C4022: 'xmlRealloc' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6881) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6881) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6892) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6892) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6899) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6899) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6908) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6908) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6917) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6917) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6922) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6922) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1

And for 2.6.22:

xmlregexp.c
..\xmlregexp.c(6864) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6864) : warning C4022: 'xmlRealloc' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6867) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6867) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6878) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6878) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6885) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6885) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6894) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6894) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6903) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6903) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\xmlregexp.c(6908) : warning C4090: 'function' : different 'const' qualifiers
..\xmlregexp.c(6908) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1


Also, I see warnings for module schematron.c (CVS):

schematron.c
..\schematron.c(565) : warning C4090: 'function' : different 'const' qualifiers
..\schematron.c(565) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\schematron.c(712) : warning C4090: 'function' : different 'const' qualifiers
..\schematron.c(712) : warning C4022: 'xmlFree' : pointer mismatch for actual
parameter 1
..\schematron.c(812) : warning C4090: 'function' : different 'const' qualifiers
..\schematron.c(812) : warning C4022: 'xmlRealloc' : pointer mismatch for actual
parameter 1


Steps to reproduce:
1. Just build libxml2 by VC6.


Actual results:


Expected results:


Does this happen every time?


Other information: