[mc1322x] linking in math libraries?

[Jon Smirl]

On Thu, Apr 8, 2010 at 10:15 AM, Mariano Alvira <mar at devl.org> wrote:
> On Thu, Apr 08, 2010 at 09:36:29AM -0400, Jon Smirl wrote:
>> On Thu, Apr 8, 2010 at 9:31 AM, Mariano Alvira <mar at devl.org> wrote:
>> > On Thu, Apr 08, 2010 at 12:00:49AM -0700, Andrew Pullin wrote:
>> >> On 4/7/2010 2:37 PM, Mariano Alvira wrote:
>> >>> On Wed, Apr 07, 2010 at 01:05:13PM -0700, Andrew Pullin wrote:
>> >>>
>> >> Well, that seems to work properly. Would newlib solve this & other
>> >> problems?
>> >
>> > I just tried my newlib build and it does solve the build issue. The
>> > rftests are 10KB larger though and it looks like printf doesn't work
>> > at all...
>>
>> Are you using -nodefaultlibs? If not you are mixing the two libs.
>
> I was not, but now with -nodefaultlibs it's actually worse. rftest-tx
> is now 51KB.
>
> I verified that from the .map that it's using newlib for everything
> except for the things it needs from libgcc.

Now you get to sort through and figure out what went wrong.

It may be bring in floating point emulation because of printf. There's
an option somewhere to stop that.

>
> -Mar.
>
> diff --git a/Makefile.include b/Makefile.include
> index 885e4a2..a9c1b91 100644
> --- a/Makefile.include
> +++ b/Makefile.include
> @@ -76,7 +76,7 @@ $(MC1322X)/src/src.a: $(MC1322X)/src/src.a($(SRCOBJS))
>
>  %_$(BOARD).elf:        $(OBJDIR)/%.o $(START) $(ISR) $(SRCOBJS) $(LINKERSCRIPT) $(LIBMC1322X)/libmc1322x.a $(OBJDIR)/board.a $(MC1322X)/src/src.a
>        $(CC) $(LDFLAGS)  \
> -       -L $(LIBMC1322X) -L $(MC1322X)/src -L $(OBJDIR)  $< -o $@ $(START) $(MC1322X)/src/src.a --start-group $(OBJDIR)/board.a $(LIBMC1322X)/libmc1322x.a --end-group
> +       -L $(LIBMC1322X) -L $(MC1322X)/src -L $(OBJDIR) $< -o $@ $(START) $(MC1322X)/src/src.a -L /home/malvira/build-newlib/arm-elf/newlib/ -lgcc -lc -lm --start-group -lgcc -lc -lm $(OBJDIR)/board.a $(LIBMC1322X)/libmc1322x.a  --end-group
>
>  %.srec:                %.elf
>                $(OBJCOPY) ${OBJCFLAGS} -O srec $< $@
> diff --git a/config.mk b/config.mk
> index 52e5a54..1a4ee8e 100644
> --- a/config.mk
> +++ b/config.mk
> @@ -30,7 +30,7 @@ gccincdir := $(shell $(CC) -print-file-name=include)
>
>  CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)                \
>        -D__KERNEL__ -DTEXT_BASE=$(TEXT_BASE)           \
> -       -fno-builtin -ffreestanding -isystem    \
> +       -nodefaultlibs -fno-builtin -ffreestanding -isystem     \
>        $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
>
>  CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wcast-align -Wextra -Werror
> @@ -38,7 +38,7 @@ CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wcast-align -Wextra -Werror
>  AFLAGS_DEBUG := -Wa,-gstabs
>  AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
>
> -LDFLAGS += -T $(LINKERSCRIPT) -nostartfiles -static -Wl,-Map=$*_$(BOARD).map -export-dynamic
> +LDFLAGS += -T $(LINKERSCRIPT) -nodefaultlibs -nostartfiles -static -Wl,-Map=$*_$(BOARD).map -export-dynamic
>
>  #########################################################################
>
>



-- 
Jon Smirl
jonsmirl at gmail.com