[PATCH] RTEMS: Use function and data sections
sebastian.huber at embedded-brains.de
Fri Oct 12 05:07:54 UTC 2018
On 11/10/2018 18:43, Joel Sherrill wrote:
> On Thu, Oct 11, 2018 at 11:09 AM Gedare Bloom <gedare at rtems.org
> <mailto:gedare at rtems.org>> wrote:
> hi Sebastian,
> generally I'm ok, but what toolchains did you test this change for?
> does this work for BSPs that have not yet been modified themselves to
> use function/data sections and to have the KEEP() directives?
> You can check the list of BSPs which do not have KEEP() directives here:
> Without LDFLAGS to use per-function/data item linking, the use of
> extra sections
> does not matter. We are using ELF on all targets now and there should
> be BSPs
> on every architecture which use this.
Yes, the trouble make is the linker --gc-sections option and not the
compiler generating more sections.
The draw back with -ffunction-sections -fdata-sections is that some
compiler optimizations are no longer possible (shouldn't be an issue in
> Another question is do you have information on the size impact for the
> before and after? I would expect some decline but not a great deal.
I didn't measure it. I added this since opendir() and fdopendir() are in
one file (just like in FreeBSD) and the extra sections should be a big
issue in Newlib which is already quite fine grained in terms of global
functions per compilation unit.
The libstdc++ uses the -ffunction-sections -fdata-sections already.
Sebastian Huber, embedded brains GmbH
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