https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66762
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > What are the precise circumstances that you see this, please? [Book15] f90/bug% gfc /opt/gcc/_clean/gcc/testsuite/gfortran.dg/submodule_1.f90 -flto lto1: error: two or more sections for .gnu.lto___foo_interface_MOD___vtab_foo_interface_Foo.b6ec16be3917c0c ... [Book15] f90/bug% gfc -v Using built-in specs. COLLECT_GCC=gfc COLLECT_LTO_WRAPPER=/opt/gcc/gcc6w/libexec/gcc/x86_64-apple-darwin14.4.0/6.0.0/lto-wrapper Target: x86_64-apple-darwin14.4.0 Configured with: ../work/configure --prefix=/opt/gcc/gcc6w --enable-languages=c,c++,fortran,objc,obj-c++,ada,java,lto --with-gmp=/opt/mp-new --with-system-zlib --with-isl=/opt/mp-new --enable-lto --enable-plugin --with-arch=corei7 --with-cpu=corei7 Thread model: posix gcc version 6.0.0 20150703 (experimental) [trunk revision 225405] (GCC) clean revision r225405.
