COFF build-id writes uninitialised data to file
1) The first write in write_build_id wrote rubbish past the struct
external_IMAGE_DEBUG_DIRECTORY, which was later overwritten with
correct data. No user visible problem there, except that tools like
valgrind complain.
2) The size for the pdb name was incorrectly calculated.
* emultempl/pe.em (write_build_id): Write the debug directory,
not the entire section contents.
(setup_build_id): Add size for the base name of pdb_name, not
the full path.
* emultempl/pep.em: Likewise.
* testsuite/ld-pe/pdb2-section-contrib.d: Update.
3 files changed
