HP-UX 11i September 2001 Release Notes

Programming
Libraries
Chapter 13
207
— ldd32 -list dynamic dependencies of executable files or shared libraries support in
dld.sl.
— Plabel cache, caches PLABELS at run-time, support in ld and dld.sl.
— ld +dependdb and +dependdb_outputdir options for generation of dependency
database, .ldb file.
— ld +objdebugonly in both 32-bit and 64-bit, to ignore debug information from non
objdebug objects or archives and proceed in +objdebug mode.
— Special support for OGL's TLS shared library in dld (both 32- and 64-bit).
Tools enhancements:
— elfdump +ild to display incremental linking information.
— ar -x option to allow modules from lib to keep datestamp.
— odump -tlssym option for displaying the TLS (thread) symbols.
— chatr +q3p enable/disable and q4p enable/disable option to support
marking 3rd/4th quadrant for private data space.
— odump -verifyall option to suppress stub warnings on executable.
— odump -filtertable to display the filtered shared library's implementation
libraries.
Details of Linker Changes
Incremental linking: Incremental linking provides significant linktime improvements for
compile-link-debug development cycles by processing only those input files that are
actually modified between cycles. Files that are not modified do not need to be
reprocessed. For large application, incremental linking may provide up to 10x and
sometimes greater improvements in linktime.
Unix 98: Support for the APIs dlopen, dlsym, dlerror and dlclose is added for 32-bit
programs.
Filtered Libraries: Filtered shared libraries divide up a large library into one filter and
several implementation libraries. The user links against the filter library, but the real
definitions of data and functions actually resides in the implementation libraries. At run
time, only those implementation libraries that are actually used are loaded. Filtered
libraries can be nested; an implementation library can itself be a filtered library
containing other implementation libraries.
GProf 32-bit support: GProf is an enhanced version of prof which produces call graph
over the input generated by prof. However, the profiling of shared library was not
supported in earlier releases. This release will support profiling of shared libraries using
the environmental variable LD_PROFILE. No recompilation is required for profiling
shared libraries.
ldd32: List dynamic dependencies of incomplete executables files or shared libraries
support in dld.sl.
PLabel cache: +plabel_cache is added to 32-bit linker and dld.sl to control the
global symbol hash mechanism.
+objdebugonly : ld +objdebugonly in both 32-bit and 64-bit, to ignore debug
information from non-objdebug objects or archives and proceed in +objdebug mode.