http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61073
Bug ID: 61073 Summary: -fcheck='do' leads to twice the amount of GDB steps in a do loop Product: gcc Version: 4.8.2 Status: UNCONFIRMED Severity: minor Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: sarantis.pantazis at gmail dot com I am not sure if this is a bug or the way it is supposed to work, but I could not find anything relative online. I have written the following code: ################################## PROGRAM test implicit none integer::i do i=1,3 write(*,*) 'bla' end do end program ################################## If I compile with "gfortran -o bla test.f90 -fcheck='do' -g", the steps of debugging through GDB show that lines 6-7 are accessed six times instead of three. ################################## Breakpoint 1, test () at test.f90:6 6 do i=1,3 (gdb) step 7 write(*,*) 'bla' (gdb) bla 6 do i=1,3 (gdb) 7 write(*,*) 'bla' (gdb) 6 do i=1,3 (gdb) 7 write(*,*) 'bla' (gdb) bla 6 do i=1,3 (gdb) 7 write(*,*) 'bla' (gdb) 6 do i=1,3 (gdb) 7 write(*,*) 'bla' (gdb) bla 6 do i=1,3 (gdb) 7 write(*,*) 'bla' (gdb) 6 do i=1,3 (gdb) 10 end program (gdb) ################################## The output of gfortran -v: Using built-in specs. COLLECT_GCC=gfortran COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)