V: Add -flto on production builds

[radare]

$ v -prod -cflags -flto foo.v
$ du -hs foo
 12K    foo
$ v -prod foo.v
$ du -hs foo
 72K    foo
$

[spytheman]

As a workaround, you can pass explicitly -cc clang or -cc gcc , in which case -flto will be added with -prod .
The reason is that by default, v uses cc, and v does not know at the moment what exactly cc is on each platform, and if cc supports the -flto flag.

[radare]

makes sense, but it will be nice if cc default could autodetect the compiler

On 1 Dec 2019, at 20:30, Delyan Angelov [e-mail] wrote:

As a workaround, you can pass explicitly -cc clang or -cc gcc , in which case -flto will be added with -prod .
The reason is that by default, v uses cc, and v does not know at the moment what exactly cc is on each platform, and if cc supports the -flto flag.

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[spytheman]

I agree. When doing -prod, the additional time to autodetect/parse cc --version first will not be a problem.