On 5/23/19 5:14 PM, Akira Urushibata via lfs-dev wrote:
Many years ago I discovered that Glibc does not build with "gcc -O0"
while conducting some experiments. If I remember correctly LFS was
around version 5.1 or so at that time. The Glibc in LFS v.5.1 is
version 2.3.3.
I consulted my good friend Richard of Free Software Foundation. He
conveyed my message to the Glibc developers. Their response was that
the developers "consider -O2 the standard". Thus this message:
# error "glibc cannot be compiled without optimization"
My memory is sketchy but I recall that a certain form of inlined
functions was a problem.
I do not think that code that relies on optimization is a good idea.
It is bad for portability and security.
You can set CFLAGS, but it is not needed. I do not, but others do.
Generally I think that the upstream developers know what the best
optimizations should be for their applications and set that by default.
-- Bruce
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