Help with gccgo cross compiler static linking

[andrewc...@gmail.com]

Can gccgo cross compile fully static binaries? I can't seem to stop it from dynamically linking glibc.

mipsel-linux-go  build -gccgoflags="-static"
/home/andrewc/Desktop/mips/cross/output/lib/gcc/mipsel-linux/5.1.0/../../../../mipsel-linux/lib/libgo.a(user.o): In function `user.lookupUnix':
/home/andrewc/Desktop/mips/cross/build-gcc/mipsel-linux/libgo/../../../gcc/libgo/go/os/user/lookup_unix.go:67: warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/home/andrewc/Desktop/mips/cross/build-gcc/mipsel-linux/libgo/../../../gcc/libgo/go/os/user/lookup_unix.go:81: warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/home/andrewc/Desktop/mips/cross/output/lib/gcc/mipsel-linux/5.1.0/../../../../mipsel-linux/lib/libgo.a(net.o): In function `net.cgoLookupPort':
/home/andrewc/Desktop/mips/cross/build-gcc/mipsel-linux/libgo/../../../gcc/libgo/go/net/cgo_unix.go:83: warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

[Ian Lance Taylor]

This is not a gccgo issue. It's a glibc issue. If you look at the
resulting executable, it should be statically linked. However, as the
warning indicates, if you want to actually run the executable, it must
be able to find, at runtime, the dynamic libraries from the same glibc
version. Glibc requires this for any program that looks up user or
host information.

I haven't tried this, but you can apparently avoid this by rebuilding
glibc itself, which is not a task recommended for beginners:

https://sourceware.org/glibc/wiki/FAQ#Even_statically_linked_programs_need_some_shared_libraries_which_is_not_acceptable_for_me.__What_can_I_do.3F

Ian

[andrewc...@gmail.com]

Thanks, perhaps I can avoid this by building gcc newlib instead of glibc. I am trying to produce entirely static binaries for running on a router even if the libc version etc may change.