Historically getline was a GNU extension, so maybe it was not automatically declared by glibc 2.5 Now it is part of the POSIX standard, so probably declared by default in newer versions of glibc. You need to remove the bad declaration of getline, or maybe you could explicitly request an older POSIX version, to override the new default. I would just fix the code though. Instead of tying to find a list of all changes, just fix the problems in your code. On Mon, 9 Jul 2018 at 18:00, Vahith .j <vahith@xxxxxxxxx> wrote: > > Hi jonathan; > > Thanks for replay, i agree your point my question when i compile my code with below system > > gcc version 4.1.2 20080704 (Red Hat 4.1.2-55) > ldd (GNU libc) 2.5 > > its compiling without any error and warning, > > but same code if try compile with below system > > gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC) > ldd (GNU libc) 2.17 > > its giving error why is that, any backward comparability is there. i mean any deprecated method is in new version, if yes what are deprecated method and where i can see the list > > > > > > On Sat, Jul 7, 2018 at 1:20 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: >> >> On Fri, 6 Jul 2018 at 20:46, Vahith .j <vahith@xxxxxxxxx> wrote: >> > >> > Hi >> > Can you tell me any code change required when we are migrating from gcc >> > 4.1.x version to gcc 4.8.x and any reference link for migrating code to new >> > compiler >> >> I already told you: remove the bad declaration of getline. >> >> This is not a general "migrating from gcc 4.1.x version to gcc 4.8.x problem". >> >> It compiled previously, maybe by chance or maybe because you had a >> different glibc, which is not part of gcc, and so nothing to do with >> migrating to a newer gcc. For whatever reason, now it doesn't compile, >> because there are two different declarations for getline. >> >> getline is a standard function, defined by POSIX, so it will be >> defined by <stdio.h> and any code that includes <stdio.h> cannot >> declare a different function called getline. >> >> So as I already said, remove the bad declaration. Rename it, or remove >> it, or whatever you need to. But you have to fix it. >> >> >> >> > >> > >> > >> > On Friday, July 6, 2018, Vahith .j <vahith@xxxxxxxxx> wrote: >> > >> > > Hi All G'Day., >> > > >> > > i am facing one issue when migrating my code to gcc 4.1 to 4.8, can you >> > > provide step to take for migration.. >> > > >> > > *problems facing: * >> > > when i use gmake command on the my cpp code in gcc 4.1, it compiles fine >> > > and executing but same code when i using in gcc 4.8 version its giving >> > > below exception can you explain cause and solution for same >> > > >> > > error: >> > > *cc -c -o include.o include.c* >> > > *In file included from include.c:30:0:* >> > > *def.h:131:9: error: conflicting types for ‘getline’* >> > > * char getline();* >> > > * ^* >> > > *In file included from def.h:31:0,* >> > > * from include.c:30:* >> > > */usr/include/stdio.h:678:20: note: previous declaration of ‘getline’ was >> > > here* >> > > * extern IO_ssize_t getline (char restrict _lineptr,* >> > > >> > > >> > > >> > > Thanks in Advance >> > > vahith.j >> > > >> > > >> > >> > -- >> > regards >> > vahith.j > > > > >
