Porting RTX-Kernel projects to Eclipse IDE and compile it using GCC compiler

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We have a project in KEIL IDE for LPC2148 which has RTX kernel programs along with other programs in it, which was compiled by ARM CC.Now we need to change the IDE from KEIL(ARM CC) to Eclipse(GCC). When we tried to compile it in Eclipse GCC Compiler, it is showing errors in RTX_Config.c and RTX_Config.h files. Other files are compiled successfully using GCC compiler. But RTXConfig.c file has compiler specific codes which are not getting compiled by GCC. Is there any solution to compile this project in Eclipse IDE using GCC compiler? Please help me out in this as am a beginner. Thanks in advance

We have some keil specific keywords like __irq , __swi, ____task , __asm which is compiled successfully by ARM CC (keil), but when we tried to port it to GCC Compiler (Eclipse), This compiler cannot compile these keywords and showing errors.
Is there any way to compile these keil specific keywords in GCC Compiler?