Jeremy Huntwork wrote:
Tushar Teredesai wrote:
glibc: -Os -march=i686 -mtune=i686 -pipe -w
From 'man gcc', in the section called "Intel 386 and AMD x86-64 Options":
"-march=cpu-type
Generate instructions for the machine type cpu-type. The
choices for cpu-type are the same as for -mtune. Moreover, specifying
-march=cpu-type implies -mtune=cpu-type."
So, in your example above, -mtune is unnecessary.
Dan Nicholson made this point and Tushar answered it a couple of hours ago
Tushar Teredesai wrote:
Yep, I know. I keep it in my CFLAGS in case some obscure package has a
-mcpu/-mtune/-m?86 in its default flags in which case the option in my
CFLAGS will override it.
Anyways, the point of my thread is not to decide which flags are ok
for glibc but that the warning in the book should be removed. It could
probably be reworded to state that -march options may cause problems.
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