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diff --git a/FAQ.in b/FAQ.in index e0e7342279..aee939dde5 100644 --- a/FAQ.in +++ b/FAQ.in @@ -625,6 +625,33 @@ If you're upgrading from glibc 2.0.x to 2.1 you have to recompile libstdc++ since the library compiled for 2.0 is not compatible due to the new Large File Support (LFS) in version 2.1. +?? Even statically linked programs need some shared libraries + which is not acceptable for me. What can I do? + +{AJ} NSS (for details just type `info libc "Name Service Switch"') +won't work properly without shared libraries. NSS allows using +different services (e.g. NIS, files, db, hesiod) by just changing one +configuration file (/etc/nsswitch.conf) without relinking any +programs. The only disadvantage is that now static libraries need to +access shared libraries. This is handled transparently by the GNU C +library. + +A solution is to configure glibc with --enable-static-nss. In this +case you can create a static binary that will use only the services +dns and files (change /etc/nsswitch.conf for this). You need +to link explicitly against all these services. For example: + + gcc -static test-netdb.c -o test-netdb.c \ + -lc -lnss_files -lnss_dns -lresolv + +The problem with this approach is that you've got to link every static +program that uses NSS routines with all those libraries. + +{UD} In fact, one cannot say anymore that a libc compiled with this +option is using NSS. There is no switch anymore. Therefore it is +*highly* recommended *not* to use --enable-static-nss since this makes +the behaviour of the programs on the system inconsistent. + ? Source and binary incompatibilities, and what to do about them ?? I expect GNU libc to be 100% source code compatible with |