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In page GNU Compiler Collection:

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In 1997, a group of developers formed the Experimental/Enhanced GNU Compiler System[citation needed] (EGCS) to merge several experimental forks into a single project.[1][2] The basis of the merger was a development snapshot of GCC (taken around the 2.7.2 and later followed up to 2.8.1 release). Mergers included g77 (Fortran), PGCC (P5 Pentium-optimized GCC),[2] many C++ improvements, and many new architectures and operating system variants.[3]