A build project runs the IAR command line executable (IARbuild.exe) for IAR 7.60 that logs warnings.
Using the Post-build attribute "Scan for compiler warnings":

• Scan console log = checked
• Parsers = IAR C/C++ Compiler

Using this parser, no Compilation warnings are generated.

Typical IAR log output:
----------------------------------------
c:\hudson\jobs\05 fw\workspace>"C:\Program Files (x86)\IAR Systems\IAR-IDE-EW8051_7_60_A\common\bin\IarBuild.exe" trunk/ide/iar/05_fw.ewp -build "Firmware - release" -log warnings

IAR Command Line Build Utility V5.6.2.0
Copyright (C) 2002-2010 IAR Systems AB.

Building configuration: 05_fw - Firmware - release
Updating build tree...

1 file(s) deleted.
Updating build tree...
reservations.c board.c digio.c int.c led.c mcu.c mem.c
cstartup.s51
debug.s51
Linking
Warning[w18]: Segment XDATA_AN (seg part no 62, symbol "pDataBuffer" in module "reservations", address [f4e8-fd7f]) overlaps segment XDATA_AN (seg part no 64, symbol "sharedBufMemory" in module "reservations", address [f4e8-fd7f])

Total number of errors: 0
Total number of warnings: 1

c:\hudson\jobs\SmartRF05 FW\workspace>exit 0
[WARNINGS] Parsing warnings in console log...
Archiving artifacts
Finished: SUCCESS
----------------------------------------