On Sat, 25 May 2013 22:54:56 +0300, Andy Johnson said: > Hi, > It seems to me that you are right. It seems that there is no problem > with the timezone. > I checked and indeed the gcc is slightly different in version > is there a work around here ? > I mean, I have gcc of ubuntu, and gcc of fedora in /mnt/sda3. Aha. Found it. THe problem is that the file arch/x86/kernel/asm-offsets.s contains in it the data for 'struct utsname' - which includes the GCC version used to compile it (as seen in 'cat /proc/version'. However, due to what *else* is in that file, changing it (as happens when you change the compiler) will basically force a rebuild of the entire tree. This is somewhat by design - there have in the past been gcc compiler versions that had a sufficiently different ABI to cause problems (for instance, around 2.95 or so, some versions would pass a structure less than 8 bytes long in registers, while other versions passed a pointer just like all other structs). Hilarity results if you have a mix of .o's compiled with the two versions. Here's the command line I used to do kernel compiles while working around a few gcc 4.7 and .8 optimizer bugs (4.6.3 worked): make CC=/opt/gcc-4.6.3/bin/gcc-46 HOSTCC=/opt/gcc-4.6.3/bin/gcc-46 but of course, this assumes that gcc-46 was built with an installdir of /opt/ gcc-4.6.3. You'll probably need to do something to add a '-B /opt/whatever' flag to the gcc call so the main gcc program finds cpp, cc1, and the rest from "the other system's directory", rather than your running /usr/bin. At some point, maybe it's easier to just decide "I'll do all my builds under Fedora, even for kernels I'll use for Ubuntu".
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