Re: gcc CXX_FLAGS

[Anthony Foiani <anthony.foiani@gmail.com>]

Arnaud --

Most makefiles are set up so you can specify flags for that
compilation on the make command line.  You probably want to do
something like this:

  make CFLAGS=-O3 CXXFLAGS=-O3

If you are passing multiple flags, you'll need to quote those values:

  make CFLAGS="-O3 -g" ...

(If you try just:

  make -O3

then 'make' will think you're trying to pass some flag "-O" to make
itself, not to the compilers invoked by make.)

Best regards,
Anthony Foiani


On Sat, May 25, 2013 at 8:01 AM, gabx <arnaud.gaboury@gmail.com> wrote:
> Dear all,
>
> I am working since many weeks now on a armv7-a toolchain with gcc 4.8. It
> builds with no issue since a while.
> I am now trying to pass some optimization CXX_FLAGS.
>
> When I enable the -03 flag for example, I write this in my .config:
>
> # gcc other options
> #
> CT_CC_ENABLE_CXX_FLAGS="-O3".
>
> It builds fine. Now I am wondering if I have to pass again this flag when I
> use this toolchain to build, let's say, android ROM.
> Shall I :
> $ make -03
>
> or as this flag has been activated when building the toolchain I do not need
> to pass it again ?
>
> In short, $ make or $ make -03 ?
>
> Thank you for help
>
>
>
>
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