embedded linux - What are the steps in general to cross compile any open source for the specific target -


my job take open source internet. cross compile mipsel toolchain , binary. struggle lot cross compile code. steps in general cross compile source package. use platform linux. example, cc, ld , else? every source code has different structure, unable make out similarity between packages. how can cross compile it? there systematic steps done? please advise.

i can assume downloaded random oss tarball , stuck now. can give pointers, because haven't discovered universal, 1 size fits solution yet, you'll have experiment bit before finding approach suits needs best. , i've still haven't encountered nontrivial cross compilation job went start finish without tweaking, fiddling , lots of patience.

  1. the basic solution: need toolchain platform, have here if there's pre-built satisfies needs, or head on dan kegel's crosstool page largely automate creation of toolchain platforms supported it, , toolchain allow compile , link programs have no other dependencies standard libraries.
  2. many open source packages come autoconf configure scripts crosscompilation-aware, ie adding --target=xxxx make them use right cross compiler. work may involve downloading , crosscompiling/installing libraries first. major issue autoconf script tries compile small piece of code study output, determine feature of environment. can solved manually modifying configure, or disabling unneeded feature via eg configure --without-xxxx
  3. if target system embedded linux system tools buildroot, openembedded or eldk automate not creation of usable toolchain, cross compilation of many commonly used libraries , add on packages linux. these tools allow add other packages target lists (eg custom application created or bought), may involve manually solving of issues explained in 2) first. there patch-scripts come these tools can used learn commonly used tricks around compilation issues.

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