linking and optimization

Some info regarding shared libraries and link optimization (just not to forget).

Command to check library's specific headers, e.g. library "soname" and required library and their versions:
objdump -p libXXX.so

To display exported symbols:
nm -g -D -C --defined-only libXXX.so

Some makefile macros to create shared library:
LIB_LINKER_NAME := libXXX.so
LIB_VERSION_MAJOR := 1
LIB_VERSION_MINOR := 1
LIB_SONAME_NAME := $(LIB_LINKER_NAME).$(LIB_VERSION_MAJOR)
LIB_REAL_NAME := $(LIB_SONAME_NAME).$(LIB_VERSION_MINOR)
$(CC) -shared -o $(LIB_REAL_NAME) $(OBJ) -L$(LIB_DIR) $(LIBS) -Wl,-soname=$(LIB_SONAME_NAME) -Wl,--version-script=XXX.expmap

Export map file for shared library:
XXX.expmap:
{
  global:
    fun1;
    fun2;

  local:
    *;
};


References
http://www.akkadia.org/drepper/dsohowto.pdf
http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html
http://mail-index.netbsd.org/tech-toolchain/1998/07/17/0000.html
wiki.linuxquestions.org/wiki/Library-related_Commands_and_Files
http://www.oracle.com/technetwork/articles/servers-storage-dev/linkinglibraries-396782.html
http://www.shrubbery.net/solaris9ab/SUNWdev/LLM/p17.html
http://www.iecc.com/linker/linker10.html
http://accu.org/index.php/journals/1372
http://www.sco.com/developers/devspecs/gabi41.pdf

Reference regarding ldconfig and embedded doubts
http://sourceware.org/ml/crossgcc/2008-11/msg00001.html

References regarding prelinking
www.mvista.com/download/vision08/Strategies-to-improve-embedded-Linux-application-performance-Vision2008.pdf
http://www.sourceware.org/ml/binutils/2006-06/msg00418.html
http://people.redhat.com/jakub/prelink.pdf
http://lwn.net/Articles/341244/