embedded - Difficulty in using C standard libraries in the SoCLib tool -


i'm electronic engineering student brazil , i'm working embedded systems.

i'm trying port mp3 decoder (written in c), called minimp3, platform built aid of soclib tool (this tool has bunch of hardware models such processors, memories , interconnections written in systemc witch allows build embedded systems models).

the platform i'm building consists of mips processor, ram, interconnection , tty (virtual terminal), mp3 decoder must cross compiled.

this mp3 decoder uses c standard libraries not instantiated in soclib tool (witch contains stdio.h , stdlib.h).

i first tried run platform without making changes in makefiles provided soclib tool. this, when entered "make" command got following messages (among others of same type):

undefined reference `tan'  undefined reference `sin'  undefined reference `cos'  undefined reference `memset'  undefined reference `realloc'  undefined reference `open'  undefined reference `strlen'

researching errors, found because linker not linking c headers, added following commands (emphasized) on makefile:

cflags=-wall -o2 -i. $(add_cflags) $(debug_cflags) $($(arch)_cflags) -ggdb -i$(common) **-i/usr/include** $(interface_cflags)   mipsel-unknown-elf-ld -q $($(arch)_ldflags) $(add_ldflags) -o $@ $(filter %.o,$^) **-lm** -t $(filter %ldscript,$^) $(libgcc)*

however, entering "make" command again, got following error:

mipsel-unknown-elf-ld: cannot find -lm

and don't know do.

can me?

when entered "make" command, got following error:

mipsel-unknown-elf-ld: cannot find -lm

the "mipsel-unknown-elf-" says using mips cross compiler, , prefixes "ld" linker-loader command. -lm option says link (the "-l" part) "m" library, spelled "libm.a" or "libm.so". means make compiled code, , trying link object file "libm" library.

see link more information,

how c compiler find -lm pointing file libm.a?

what want tell linker-loader path(s) search libraries, means need find "libm.a" and/or "libm.so", , other libraries plan use, "lib*.a" , "lib*.so*". determine paths need, , add these library search paths using "-l path" option.

and know do. -chuck


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