Hi! On Tue, Feb 08, 2011 at 06:23:57PM -0600, Dennis Gilmore wrote: > so the mass rebuild is 24 hours in we have completed ~45% of the builds and > are at 365 packages failed to build the total number of builds in the mass > rebuild is 10404 we are churning along nicely. i expect to complete the first > pass sometime in the next 24 hours. so far i think its going pretty well > > some web pages to look at http://ausil.fedorapeople.org/rebuild.html and > http://ausil.fedorapeople.org/failed.html these 2 pages are updated ~ every > 10 > minutes. Please drop into #fedora-devel on freenode if you have any questions.
I went through the failed.html list from shortly after you mailed this, looking for errors related to GCC 4.6 (and sometimes even 4.5). Here are some common errors. Please try to fix the issues rather than adding workaround flags like -fpermissive, -Wno-unused-but-set-variable etc. Benjamin, do you plan to write http://gcc.gnu.org/gcc-4.6/porting_to.html? This could serve as partial source for that page. -Werror=unused-but-set-variable void fn (void) { int foo; foo = bar (); /* foo is never used. */ } This is a new warning, which warns about variables that are only ever set, but never otherwise used. Usually such variables useless and often even the value assigned to them is computed needlessly, sometimes expensively. In such cases you should just drop the vars and initializers. Sometimes functions called during the initialization have important side-effects for the program, so you really need to read the source. So sometimes you want to drop the unuse variables, but keep some function calls from their initialization in the code. In some cases (often from macro expansion) you just want to keep such unused variables around. You can in that case just cast them to void, or add __attribute__((__unused__)) to them. As this is just a warning, it is usually just a nice to fix thing, but for packages that are compiled with -Werror it is a must fix. STL headers not including <cstddef> any longer If you see errors like 'ptrdiff_t' does not name a type 'size_t' does not name a type 'NULL' was not declared in this scope 'size_t' has not been declared 'offsetof' was not declared in this scope there are no arguments to 'offsetof' that depend on a template parameter, so a declaration of 'offsetof' must be available or warnings like perhaps the 'offsetof' macro was used incorrectly then most likely you have C++ code that includes some STL headers and relied on them bringing in <stddef.h> and is using ::ptrdiff_t, ::size_t, offsetof or NULL macros. The STL headers now just declare std::ptrdiff_t and std::size_t itself when needed, and no longer bring in <stddef.h>, so if you use the global namespace types from stddef.h or offsetof/NULL, just include <cstddef> explicitly. uninitialized const struct A { int a; A (); }; struct B : public A { }; const B b; now gets an error: error: uninitialized const ‘b’ [-fpermissive] note: ‘const struct B’ has no user-provided default constructor This is related to http://gcc.gnu.org/PR43890, B above doesn't have a user provided default ctor, so either an initializer needs to be provided, or the default ctor needs to be added. reference ‘...’ cannot be declared ‘mutable’ struct A { mutable int &p; int q; A () : p(q) {} }; http://gcc.gnu.org/PR33558 Just remove mutable keyword from references. taking address of temporary struct S { S (); int i; }; void bar (S *); void foo () { bar (&S ()); } http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164704 http://gcc.gnu.org/ml/gcc-patches/2010-09/msg02144.html This used to be just a warning, now it is an error (unless -fpermissive). Please don't add -fpermissive, instead just add a variable and pass address of the variable if at all possible. duplicate member struct A { int *a; union { struct { int *a; }; }; }; used to be diagnosed just by C++ FE, now since http://gcc.gnu.org/PR4784 it is diagnosed also by C. Because of the anonymous unions/structs there is ambiguity about what .a actually refers to, one of the fields needs to be renamed. unrecognized option '-combine' The -combine option has been removed, it has been very buggy and has been superceeded by -flto. Either drop it, or build with -flto. -export-dynamic Some packages are passing -export-dynamic to gcc/g++ drivers, when they should be using -Wl,-export-dynamic or -rdynamic or -Wl,-E. See http://gcc.gnu.org/PR47390, it is unclear yet whether gcc 4.6 will handle it for backwards compatibility when it has never been documented it would work this way. --export-dynamic --no-undefined gcc/g++ drivers in 4.4/4.5 didn't accept these options either, so I guess this is some libtool issue. Some packages are also using -Wl, --export-dynamic (note the space in between -Wl, and the option). That's wrong, but didn't work previously either. cannot call constructor directly struct A { A (); A (int); int i; }; A::A (int x) { A::A (); i = x; } This used to be accepted in 4.4, but already 4.5 rejects it (so 4.5 porting_to.html material). http://gcc.gnu.org/PR42415 storage size of '...' isn't constant void foo (void) { static char buffers[2][(int)(sizeof(int)*3.32)+3]; } This used to be accepted in C until 4.4, but isn't any longer, since floating point multiplication there makes it no longer a valid constant expression. In this case just multiply by 4 instead (but even sizeof(...)*3 +3 would work for "%llu" or "HEAD"). Again, 4.5 porting_to.html material. names the constructor, not the type struct S { S (); }; void foo () { S::S s; } This used to be accepted until 4.4, but isn't any longer, ::S should be dropped. http://gcc.gnu.org/PR9050 4.5 porting_to.html material. internal compiler error If you see this, please do a build in local mock and file a bugreport with the attached /tmp/cc*.out file from the buildroot about which the gcc/g++ error talked about. If none has been prepared and it is still reproduceable (shouldn't happen), then please preprocess it manually, verify it reproduces with the preprocessed file and file it. GCC bugs: http://gcc.gnu.org/PR47662 - -fno-operator-names no longer works with STL http://gcc.gnu.org/PR47665 - ICE in trunc_int_for_mode on SSE2 code http://gcc.gnu.org/PR47666 - ICE in dfs_walk_once Jakub -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
