no, it isn't.
i just tried 2.3.34 with gcc 2.7.2.3 as well as egcs 1.0.2, 1.1.2 and
gcc 2.95, and they all still work...
i'd guess you have some make/shell/compiler problem;
see arch/i386/Makefile for the autodetection code -- it is supposed
to turn these options on only if the compiler supports them.
$ make vmlinux "CC=/usr/local/gcc-2.7.2/bin/gcc -B/usr/local/gcc-2.7.2/lib/gcc-lib/i486-linux/2.7.2.3/"
/usr/local/gcc-2.7.2/bin/gcc -B/usr/local/gcc-2.7.2/lib/gcc-lib/i486-linux/2.7.2.3/ -D__KERNEL__ -I/usr/src/linux-2.3.34as/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -DCPU=686 -DHZ=1024 -DUTS_MACHINE='"i386"' -c -o init/version.o init/version.c
$ make vmlinux "CC=/usr/local/egcs-1.1.2/bin/gcc -B /usr/local/egcs-1.1.2/lib/gcc-lib/i686-pc-linux-gnu/egcs-2.91.66/"
/usr/local/egcs-1.1.2/bin/gcc -B /usr/local/egcs-1.1.2/lib/gcc-lib/i686-pc-linux-gnu/egcs-2.91.66/ -D__KERNEL__ -I/usr/src/linux-2.3.34as/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe -fno-strength-reduce -DCPU=686 -DHZ=1024 -march=i686 -DUTS_MACHINE='"i386"' -c -o init/version.o init/version.c
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