I use the 12.1 Build 20111011 compiler (update 7), when I make an speed optimized build I get
ipo: remark #11024: Main entry point was not seen
Ok, its just a remark, butwhat does this mean ?
yes /Qipo is set the target is an dll and it is multi file project, my compiler switches are
/Wall /Wport /Wcheck /Wp64 /FIgiCPWarnRestrictions.h /nologo /Ox /Oi /Oy /QaxSSE2 /Qip /Qipo /Qprec-div- /Qopt-prefetch /fp:source /Qscalar-rep /Gd /GR /c /Qvc10 /arch:IA32 /Qglobal-hoist- /Qms0 /Qrestrict /Qsfalign- /WL /DWIN32_LEAN_AND_MEAN /GF /Zp4 /MD /EHs /EHc
I can try to make it simpler, but this will need a little time.
Just an addition for tests without IPO to see if this helps. Please add also LINKER option /qnoipo (Configuration Properties > Linker > Optimization [Intel C++] > Interprocedural Optimization: No (/qnoipo). The compiler option alone DOES NOT disable interprocedural optimization.
Let me know if this helps.