An explanation of why optimization is required to build Glibc appears in the official FAQ.
Frequently Asked Questions about the GNU C Library https://sourceware.org/glibc/wiki/FAQ Question 1-12 Why do I get: #error "glibc cannot be compiled without optimization", when trying to compile GNU libc with GNU CC? --- The Glibc developers say that inlining must be enforced in certain circumstances to cope with situations that are peculiar to Glibc. I believe that it is not quite accurate to describe this as an optimization issue. The goal of optimization is better performance. A very smart compiler may figure out that inlining a certain function does not lead to a performance gain and make it an independent, standard function, overriding the intent of the programmer stated by "inline". My guess is that GCC does not do this, but there is no guarantee. If inlining must be enforced, the right way to do it is by setting a compiler option that does just that where it is necessary. Using "-O2" for that effect is not sound. I frequently override the default CFLAGS and provide my own, but not when building Glibc. -- http://lists.linuxfromscratch.org/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
