https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66459
Bug ID: 66459 Summary: bogus warning 'w.offset' may be used uninitialized in this function [-Wmaybe-uninitialized] Product: gcc Version: 5.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: mario-baumann at web dot de Target Milestone: --- Created attachment 35716 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35716&action=edit Fortran Fixed Form File Hi All, The attached file generates bogus warnings if compiled with -Wall AND -O1(or higher optimizations). > gfortran -c -Wall -O1 foo.F foo.F:14:0: W(J,I) = 0 ^ Warning: 'w.offset' may be used uninitialized in this function [-Wmaybe-uninitialized] foo.F:14:0: Warning: 'w.dim[1].stride' may be used uninitialized in this function [-Wmaybe-uninitialized] > gfortran -v Using built-in specs. COLLECT_GCC=./gfortran COLLECT_LTO_WRAPPER=/Build/gcc/5.1.0/install/libexec/gcc/x86_64-apple-darwin13/5.1.0/lto-wrapper Target: x86_64-apple-darwin13 Configured with: /Source/gcc/5.1.0/configure --prefix=/Build/gcc/5.1.0/install --build=x86_64-apple-darwin13 --enable-languages=c,c++,fortran,lto --enable-cloog-backend=isl --enable-stage1-checking --enable-lto --enable-libstdcxx-time --with-system-zlib --disable-cloog-version-check --disable-nls --disable-libquadmath-support Thread model: posix gcc version 5.1.0 (GCC) NOTEs: - -O0 works fine - same behaviour with gcc-4.9.2