Hi! In the past few days I've done a mass rebuild of rawhide-20090126 in mock with gcc-4.4.0-0.9 (and corresponding libtool). 6228 packages were successfully built, for the rest I've tried to rebuild them also with gcc-4.3.2-7 (though I ran out of time, so a couple of packages weren't attempted with 4.3). Here are the most common causes of the regressions (fails to build with gcc-4.4.0-0.9, succeeds with gcc-4.3.2-7): - 142 failures C++ <string> (<bits/char_traits.h>) no longer includes <cstdio>. So does <ios>, <streambuf>, <iomanip>, <locale>. When you need anything from C stdio.h, such as EOF, *printf*, *scanf*, remove etc., add #include <cstdio> to all sources that need it. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/cstdio/ - 22 failures G++ 4.4 rejects int main () { return main (); } or int main () { main (); return 0; }, as main shouldn't be used within the program (see ISO C++ [basic.start.main]/3). This breaks some configure scripts, e.g. AC_CHECK_LIB with second argument main as in AC_CHECK_LIB(stdc++,main,,AC_MSG_ERROR([libstdc++ not installed])) will now fail. As AC_CHECK_LIB isn't well suited for C++, which requires prototypes and AC_CHECK_LIB doesn't provide them, I guess AC_CHECK_LIB(stdc++,int,,AC_MSG_ERROR([libstdc|| not installed])) could be used instead. This results in int main () { return int (); } or int main () { int (); return 0; } Only packages that actually failed to build because of this are listed, there are many more that are affected by it though. Look for checking for main in -l... giving no, even for packages that succeeded. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/main/ - 15 failures C++ <string> (<bits/postypes.h>) no longer includes <stdint.h>. Neither does <ios>. When you need uint32_t, uint8_t etc., #include <stdint.h>. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/stdint/ - 15 failures #elif argument is now evaluated even if earlier #if/#elif condition evaluated non-zero, to make sure they are valid constant expressions. See http://gcc.gnu.org/PR36320 To fix this, either use #else when you want it instead of #elif (e.g. several packages use #elif without any argument at all), or use #else #if ... #endif. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/elif/ - 8 failures glib2's gthread.h contains a couple of aliasing issues (e.g. in g_once_init_enter) and a bunch of programs get bitten by it when they inline it. This should be fixed in glib2. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/glib.aliasing/ - 6 failures Other aliasing problem. In the GCC 4.3 -> 4.4 transition the most common problem is: char buf[NNN]; // or unsigned char or signed char ... ((struct somestruct *)buf)->somefield = 1 While you can access any object through char, unsigned char or signed char pointer and modify parts/all of it, it is not the other way around. In this case you probably want a union of the buffer and struct somestruct. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/aliasing/ - 2 failures GCC bugs that were already fixed in newer gcc 4.4 (4.4.0-0.13 should work). http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/already_fixed/ - 1 failure Package built with -Werror, where one extra warning appeared. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/Werror/ - 1 failure g++ now errors on: struct C { virtual ~C (); }; struct B : public C { int i; }; struct A { const B a; A () { bar (&a); } void bar (const B *); }; while previously it only errored if C virtual wasn't involved. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/uninit/ - 1 failure __builtin_stdarg_start has been removed. #include <stdarg.h> should be used, rather than writing stuff by hand, and if really necessary (why?), then at least it needs to use __builtin_va_start instead. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/stdarg/ - 1 failure open with O_CREAT set in the second argument needs to have 3 arguments, not just 2. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/open2/ - 1 failure free called with a pointer to non-heap allocated object. E.g. char buf[128], *bufp; ... bufp = buf; if (something) { bufp = malloc (somesize); ... } ... if (bufp != buf) free (buf); // Should have been bufp. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/nonheapfree/ - 30 failures Unsorted stuff that succeeds to build with 4.3 and fails to build with 4.4. Only looked briefly at openbabel, in which case the bug is that it has locale.h in the include search path, which overrides the system <locale.h>. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/unsorted/ - 31 failures Various mock related issues, packages failed at root.log stage, before starting to build. Some might be related to mock being used on RHEL5 instead of a recent fedora. http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/deps/ - 167 failures packages that failed to build both with gcc 4.3 and 4.4 http://sunsite.mff.cuni.cz/rawhide20090126-gcc44/fails-even-with-43/ - 117 failures unanalyzed packages with failed to build with 4.4, but 4.3 build wasn't performed (ran out of time), so either they fall into fails-even-with-43 category, or into unsorted. Jakub -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
