gcc now works with older CPUs

Three people reported that when they tried to compile with gcc, they got "illegal instruction". So, have to do something about it.

No problem for me; I compile on computers with Intel i3 and Ryzen 5 CPU. Today booted up Easy on a much older computer, with an earlier-gen i5 CPU, with the devx SFS loaded, when ran "gcc --help" got that "illegal instruction". Hmmm.

Here is the blog post how gcc was compiled:

https://bkhome.org/news/202212/gcc-problem-in-kirkstone-series.html

Today made some changes, shown in bold:

# cd build
# ../configure --build=x86_64-poky-linux --prefix=/usr --exec_prefix=/usr --bindir=/usr/bin \
  --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --sysconfdir=/etc \
  --sharedstatedir=/com --localstatedir=/var --libdir=/usr/lib --includedir=/usr/include \
  --oldincludedir=/usr/include --infodir=/usr/share/info --mandir=/usr/share/man \
  --disable-silent-rules --with-libtool-sysroot=/ --with-gnu-ld --enable-shared \
  --enable-languages=c,c++ --enable-threads=posix --disable-multilib --enable-default-pie \
  --enable-c99 --enable-long-long --enable-symvers=gnu --enable-libstdcxx-pch \
  --program-prefix=x86_64-poky-linux- --without-local-prefix --disable-install-libiberty \
  --enable-lto --disable-libssp --enable-libitm --disable-bootstrap --disable-libmudflap \
  --with-system-zlib --with-linker-hash-style=gnu --enable-linker-build-id --with-ppl=no \
  --with-cloog=no --enable-checking=release --enable-cheaders=c_global --without-isl \
  --with-build-sysroot=/ --disable-static --enable-nls --with-glibc-version=2.35 \
  --enable-initfini-array --enable-__cxa_atexit --with-arch=nocona --with-tune=nocona
# make CFLAGS=-march=nocona CXXFLAGS=-march=nocona CFLAGS_FOR_TARGET=-march=nocona CXXFLAGS_FOR_TARGET=-march=nocona BOOT_CFLAGS=-march=nocona BOOT_CXXFLAGS=-march=nocona
# make install

Not sure which one of those did the trick, but it now works. Don't think that "--with-tune=nocona" is required. The problem is with the gcc executable itself, so those variables look like the needed fix.

Created a PET, installed in the other computer with the old i5 CPU, this time it works, and even compiled a program to verify.  

Tags: easy