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| -rw-r--r-- | FAQ.in | 26 |
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@@ -387,6 +387,31 @@ yourself. Please remember that for each architecture there may be various patches required to get glibc HEAD into a runnable state. The best course of action is to determine if you have all the required patches. +?? Why do I get: + `#error "glibc cannot be compiled without optimization"', + when trying to compile GNU libc with GNU CC? + +{AJ,CO} There are a couple of reasons why the GNU C library will not work +correctly if it is not complied with optimzation. + +In the early startup of the dynamic loader (_dl_start), before +relocation of the PLT, you cannot make function calls. You must inline +the functions you will use during early startup, or call compiler +builtins (__builtin_*). + +Without optimizations enabled GNU CC will not inline functions. The +early startup of the dynamic loader will make function calls via an +unrelocated PLT and crash. + +Without auditing the dynamic linker code it would be difficult to remove +this requirement. + +Another reason is that nested functions must be inlined in many cases to +avoid executable stacks. + +In practice there is no reason to compile without optimizations, therefore +we require that GNU libc be compiled with optimizations enabled. + ? Installation and configuration issues ?? Can I replace the libc on my Linux system with GNU libc? @@ -1685,6 +1710,7 @@ Answers were given by: {AO} Alexandre Oliva, <aoliva@redhat.com> {BH} Bruno Haible, <haible@clisp.cons.org> {SM} Steven Munroe, <sjmunroe@us.ibm.com> +{CO} Carlos O'Donell, <carlos@systemhalted.org> Local Variables: mode:outline |