Re: [Xen-devel] staging: libxl compile error in libxl__domain_save

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 29/02/16 06:54, Olaf Hering wrote:
> On Sun, Feb 28, Wei Liu wrote:
>
>> If the current set of compiler flags is not good enough, we should
>> improve it. I'm afraid having a third set of maintainer mode flags that
>> nobody else uses is going to cause us more headache.
> There is nothing wrong with the CFLAGS. They are perfect for developers.
> But the commiters hopefully do some sort of compile test before doing a
> push. And this compile test must include -O2 to enable enough
> diagnostic to catch developer errors.

 gcc  -O1 -fno-omit-frame-pointer -m64 -g -fno-strict-aliasing
-std=gnu99 -Wall
-Wstrict-prototypes -Wdeclaration-after-statement
-Wno-unused-but-set-variable
-Wno-unused-local-typedefs   -O0 -g3
-D__XEN_INTERFACE_VERSION__=__XEN_LATEST_INTERFACE_VERSION__ -MMD -MF
.libxl_dom_save.o.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-fno-optimize-sibling-calls -fmessage-length=0 -grecord-gcc-switches -O2
-Wall
-D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables
-fasynchronous-unwind-tables -g -Werror -Wno-format-zero-length
-Wmissing-declarations -Wno-declaration-after-statement
-Wformat-nonliteral -I.
-fPIC -pthread

This set of options is very messy.  We have both an -O1, an -O0 and an
-O2, as well as three different -g's

Frankly, at no point ever should -O0 be used, even for debugging.  -Og
if available or -O1 if not.

In this case, the -O2, being latest, should take priority.  However, it
would be useful to identify which flags are coming from where, and see
if we usefully reduce them.

~Andrew

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