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Date: Fri, 20 Apr 2012 10:00:21 -0700
From: Isaac Dunham <idunham@...abit.com>
To: musl@...ts.openwall.com
Subject: Re: musl vs wireless-tools

On Fri, 20 Apr 2012 12:41:06 -0400
Rich Felker <dalias@...ifal.cx> wrote:

> On Fri, Apr 20, 2012 at 09:23:11AM -0700, Isaac Dunham wrote:
> > Getting farther...
> > But still not working.
> > 
> > Here it looks like musl-gcc may be forgetting the -lm  I gave it.
> 
> I don't think that would be an issue:
> 
> $ ls -l libm.a
> -rw-r--r--    1 dalias   users            8 Apr 17 13:18 libm.a
> 
> > musl-gcc -Os -W -Wall -Wstrict-prototypes -I.
> > -DIW_USES_ITS_OWN_DOGFOOD -I/opt/musl/linux-headers/include
> > -D_GNU_SOURCE -MMD     -fPIC -c -o iwlib.so iwlib.c musl-gcc
> > -shared -o libiw.so.30 -Wl,-soname,libiw.so.30  -lm -lc iwlib.so
> > musl-gcc -Os -W -Wall -Wstrict-prototypes -I.
> > -DIW_USES_ITS_OWN_DOGFOOD -I/opt/musl/linux-headers/include
> > -D_GNU_SOURCE -MMD     -c iwconfig.c musl-gcc   -Os -W -Wall
> > -Wstrict-prototypes -I. -DIW_USES_ITS_OWN_DOGFOOD
> > -I/opt/musl/linux-headers/include -D_GNU_SOURCE -MMD     -o
> > iwconfig iwconfig.o libiw.so.30 /usr/bin/ld: warning: cannot find
> > entry symbol _start; defaulting to 0000000008048c68
> 
> This line is actually more troubling and suggests to be that your
> installation of musl is broken (it's not linking crt1.o).
> 
> > libiw.so.30: undefined reference to `ceil'
> > libiw.so.30: undefined reference to `floor'
> > libiw.so.30: undefined reference to `pow'
> > libiw.so.30: undefined reference to `log10'
> > collect2: ld returned 1 exit status
> > make: *** [iwconfig] Error 1
> 
> Not sure what's happening here; why not add -v to the command line so
> gcc shows you the actual commands it's passing to the compiler (cc1)
> and linker (collect2/ld)?
> 
> Actually, there's one other line that looks odd; I'll repeat it here:
> 
> > musl-gcc -shared -o libiw.so.30 -Wl,-soname,libiw.so.30  -lm -lc
> > iwlib.so
Here's what the makefile has...

# Compilation of the dynamic library
$(DYNAMIC): $(OBJS:.o=.so)
	$(CC) -shared -o $@ -Wl,-soname,$@ $(STRIPFLAGS) $(LIBS) -lc $^  

# Compilation of the static library
$(STATIC): $(OBJS:.o=.so)
	$(RM) $@
	$(AR) cru $@ $^
	$(RANLIB) $@
> Having only libraries (-lm -lc iwlib.so) as input for the linker makes
> no sense. Can you tell what they're trying to do? I'm doubtful that
> even the package authors knew what they were trying to do here. If
> it's possible to build this package static-linked (or at least with
> none of its own .so files) that would be a much smarter approach).


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