[Q]: EMX vs. Innotek GCC: differences in build environment

[A]: Dave Webster (Dave.Webster@bhmi.com)

Here is what Innotek gcc 3.2.2 Beta 4 defines by default

32BIT EMX OS2 i386 i386 unix MT INNOTEK_LIBC=0x005

And -Asystem of unix, posix and emx

So the main way to differentiate between regular EMX and INNOTEK is checking for INNOTEK_LIBC. Straight EMX will not have that defined. In general anything that applies to EMX also applies to INNOTEK, but INNOTEK may have some requirements specific to it in addition to those for EMX.

The main difference I have found between the latest pure EMX distribution, gcc 3.2.1 from Hobbes and Innotek gcc 3.2.2 Beta 3 and 4 is in the default stdc++ library. EMX still defaults to -lstdcxx and uses classic iostream.h and such while Innotek defaults to the current std lib stuff (iostream) and -lstdc++ and lsupc++. Also you should use g++ under Innotek for c++ and gcc only for straight “c” code. Basically, Innotek is almost exactly like using gcc for Linux, which is why running configure in wxWindows tends to produce a Makefile identical to the gtk Makefile rather than EMX Makefile. With beta 4 Innotek finally has defined -shared (along with some other OS/2 dll specific switches as outlined in the release notes).