On Wed, Jun 15, 2022 at 7:37 AM Kai Ruottu <kai.ruottu@xxxxxxxxxxx> wrote: > > Paul Lucas via Gcc-help kirjoitti 14.6.2022 klo 19.18: > > Hi there - > > > > I want to build a cross-compiler from Linux x86_64 (host) to AIX PowerPC (target). Eventually, while building gcc, I get: > > > >> collect2: fatal error: libgcc.a: cannot open as COFF file > > > > While Linux uses ELF and AIX uses coff, I would have assumed that the binutils I built for the cross-compiler would have produced a linker that was able to link COFF files. > > > > The configure for binutils was: > > > >> configure --disable-gold --prefix=/aix-powerpc --disable-multilib --disable-nls --target=powerpc-ibm-aix7.1.0.0 --with-sysroot=/aix-powerpc --with-arch=powerpc --disable-werror --enable-plugins > > where /aix-powerpc contains headers and libraries copied from a live AIX system. > > > The GNU Install documents for target platforms : > > https://gcc.gnu.org/install/specific.html#x-ibm-aix > > are saying : > > "The native |as| and |ld| are recommended for bootstrapping on AIX. The > GNU Assembler, GNU Linker, and GNU Binutils version 2.20 is the minimum > level that supports bootstrap on AIX 5. The GNU Assembler has not been > updated to support AIX 6 or AIX 7. The native AIX tools do interoperate > with GCC." > > So it seems that AIX 6 and AIX 7 aren't supported in GNU binutils :( > > The biggest problem in this issue probaly is that so few people can get > the "headers and libraries copied from a live AIX system". Or IBM or > something would provide them freely > for everyone wanting to make crosscompilers for AIX. Those who have AIX > systems just produce native GNU tools and are happy. Others aren't > interested to work with cross > tools they cannot make... > For instance the Sun Solaris2 headers and libraries have beem freely > available just like the whole Sparc/x86 operating systems. So anyone > could have procuded crosstools for these > platforms if having the required know-how for building GNU tools. I had also tried to get a Linux x86_64 cross compiler targeting AIX 6.1 several years ago and was never able to make it work, the issue was always binutils and not gcc. Even when I compiled native binutils and gcc on AIX 6.1 I ended up using the AIX versions of as/ld/ar/etc since they worked more reliably than the binutils versions. I eventually gave up on a cross compiler and continued to natively compile, though cross compilation would have been a much nicer and more scalable system. I recall bumping into the docs that Kai quoted here, which confirmed that it just wasn't going to work since there was effectively no assembler that worked.
