Re: [gentoo-user] verifying GCC version program was compiled with
On Sunday 05 April 2009 01:31:16 Joseph wrote: On 04/04/09 23:55, Alan McKinnon wrote: [snip] [1] http://www.gentoo.org/doc/en/gcc-upgrading.xml This is complete nonsense advice. There is absolutely no need to rebuild the entire system every time you upgrade compilers, and whoever told you that is flat out wrong. If the gentoo docs told you that, then they are wrong, or misplaced, or the person writing them is overcautious to the point of being ridiculous. If this advice really was true, then a whole lot of stuff would break all over the world: [snip] So in other words it was not necessary to recompile the entire system in this case going from gcc: 4.3.2 to 4.2.3 ? Though, according to Gentoo guide, the second number has changed so this is a major upgrade. Not to mention it is good to take advantage of native flag. I mean that you take a step like this when it is required and only when it is required. If the documentation says that for *that* version you should rebuild everything, then do so. But only do it if it is required. As I already said, you only need to do that when new binaries on your system will be incompatible with existing binaries resulting in them not loading and linking properly. This is extremely rare. The native flag will make almost no difference to your machine either, it will not turn your Mini into a Ferrari. All it really is, is a simple way to tell your compiler whatever this cpu is, compile stuff optimized for that processor. Now you don't have to go digging to find out what to set march, mtune, et al to. So it's a user convenience feature more than anything else. Your system will work just fine without rebuilding with native. The previous binaries worked, they will still work. -- alan dot mckinnon at gmail dot com
Re: [gentoo-user] verifying GCC version program was compiled with
On Sunday 05 April 2009 00:11:52 Daniel Pielmeier wrote: There are some special cases where the gcc devs break stuff at an ABI level between versions (usually related to C++ not to C). These are well known and heavily documented - the toolchain devs make sure of this. 3.3 to 3.4 was such a case, there was another minor case early in the gcc-4 series. By no means do this mean that the fix for those cases must now be applied every time. I must confess that I don't know if there is an ABI breakage between 4.1.2 and 4.3.2. So if there is none you may be fine without rebuilding world. There isn't one. I know this simply because I have not rebuilt world since before 4.1.2 on my desktop, it is currently ~arch and everything works fine. -- alan dot mckinnon at gmail dot com
[gentoo-user] verifying GCC version program was compiled with
Is there a way to verify GCC version program was compiled with? I just want to check if all the programs were compiled with latest GCC version as I'm getting an errors at time to time. -- Joseph
Re: [gentoo-user] verifying GCC version program was compiled with
Joseph schrieb am 04.04.2009 22:48: Is there a way to verify GCC version program was compiled with? I just want to check if all the programs were compiled with latest GCC version as I'm getting an errors at time to time. I don't think it is possible to get the compiler or it's version used for a specific program. If you are upgrading the compiler it is advisable to recompile the complete system so all programs are compiled with the same compiler version. Take a look at the gcc upgrading guide [1] for the necessary steps you need to follow. [1] http://www.gentoo.org/doc/en/gcc-upgrading.xml -- Daniel Pielmeier signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] verifying GCC version program was compiled with
On Saturday 04 April 2009 23:42:54 Daniel Pielmeier wrote: Joseph schrieb am 04.04.2009 22:48: Is there a way to verify GCC version program was compiled with? I just want to check if all the programs were compiled with latest GCC version as I'm getting an errors at time to time. I don't think it is possible to get the compiler or it's version used for a specific program. If you are upgrading the compiler it is advisable to recompile the complete system so all programs are compiled with the same compiler version. Take a look at the gcc upgrading guide [1] for the necessary steps you need to follow. [1] http://www.gentoo.org/doc/en/gcc-upgrading.xml This is complete nonsense advice. There is absolutely no need to rebuild the entire system every time you upgrade compilers, and whoever told you that is flat out wrong. If the gentoo docs told you that, then they are wrong, or misplaced, or the person writing them is overcautious to the point of being ridiculous. If this advice really was true, then a whole lot of stuff would break all over the world: - every Windows box on the planet would need a complete reinstall whenever a Windows Update happened (Yes, Microsoft does upgrade their compiler!) - third party apps would not run, as you have no way of knowing if Oracle's compiler is the same as yours (and you don't even have a guarantee that Oracle uses gcc). My Oracle instance at work is working just fine and I know for a fact the compilers used for it and SuSE are not even in the same version series. - Compiling any package locally could not work on a binary distro. But they do. There are *some* special cases where the gcc devs break stuff at an ABI level between versions (usually related to C++ not to C). These are well known and heavily documented - the toolchain devs make sure of this. 3.3 to 3.4 was such a case, there was another minor case early in the gcc-4 series. By no means do this mean that the fix for those cases must now be applied every time. -- alan dot mckinnon at gmail dot com
Re: [gentoo-user] verifying GCC version program was compiled with
Alan McKinnon schrieb am 04.04.2009 23:55: On Saturday 04 April 2009 23:42:54 Daniel Pielmeier wrote: Joseph schrieb am 04.04.2009 22:48: Is there a way to verify GCC version program was compiled with? I just want to check if all the programs were compiled with latest GCC version as I'm getting an errors at time to time. I don't think it is possible to get the compiler or it's version used for a specific program. If you are upgrading the compiler it is advisable to recompile the complete system so all programs are compiled with the same compiler version. Take a look at the gcc upgrading guide [1] for the necessary steps you need to follow. [1] http://www.gentoo.org/doc/en/gcc-upgrading.xml This is complete nonsense advice. There is absolutely no need to rebuild the entire system every time you upgrade compilers, and whoever told you that is flat out wrong. If the gentoo docs told you that, then they are wrong, or misplaced, or the person writing them is overcautious to the point of being ridiculous. If this advice really was true, then a whole lot of stuff would break all over the world: - every Windows box on the planet would need a complete reinstall whenever a Windows Update happened (Yes, Microsoft does upgrade their compiler!) - third party apps would not run, as you have no way of knowing if Oracle's compiler is the same as yours (and you don't even have a guarantee that Oracle uses gcc). My Oracle instance at work is working just fine and I know for a fact the compilers used for it and SuSE are not even in the same version series. - Compiling any package locally could not work on a binary distro. But they do. There are *some* special cases where the gcc devs break stuff at an ABI level between versions (usually related to C++ not to C). These are well known and heavily documented - the toolchain devs make sure of this. 3.3 to 3.4 was such a case, there was another minor case early in the gcc-4 series. By no means do this mean that the fix for those cases must now be applied every time. I must confess that I don't know if there is an ABI breakage between 4.1.2 and 4.3.2. So if there is none you may be fine without rebuilding world. -- Daniel Pielmeier signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] verifying GCC version program was compiled with
On 04/04/09 23:55, Alan McKinnon wrote: [snip] [1] http://www.gentoo.org/doc/en/gcc-upgrading.xml This is complete nonsense advice. There is absolutely no need to rebuild the entire system every time you upgrade compilers, and whoever told you that is flat out wrong. If the gentoo docs told you that, then they are wrong, or misplaced, or the person writing them is overcautious to the point of being ridiculous. If this advice really was true, then a whole lot of stuff would break all over the world: [snip] So in other words it was not necessary to recompile the entire system in this case going from gcc: 4.3.2 to 4.2.3 ? Though, according to Gentoo guide, the second number has changed so this is a major upgrade. Not to mention it is good to take advantage of native flag. -- Joseph
