https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99703
--- Comment #31 from Worx <worx at pouf dot org> --- I use this Gentoo configuration : CHOST="i586-pc-linux-gnu" CFLAGS="-march=c3 -m3dnow -O2 -pipe -fomit-frame-pointer" CXXFLAGS="${CFLAGS}" Here you are a comment shared in the below link : Warning: Do not use any stages or packages containing i686 instructions (such as cmov) with the Samuel 2 and Ezra versions of the C3. The Ezra doesn't have any special instructions that you could optimize for, just consider it a K6-3 - basically a Pentium 2 with 3DNow. http://wikigentoo.ksiezyc.pl/Safe_Cflags.htm#C3_Nehemiah_.28C5X.2FC5XL.2FC5P.29_.28VIA.29 So, How can i run a make bootstrap with GCC source directly, How can i setup this configuration ?