Allow invoking the linker on an executable.

The executable can be inside a zip file using the same syntax used for
shared objects: path.zip!/libentry.so.

The linker currently requires an absolute path. This restriction could be
loosened, but it didn't seem important? If it allowed non-absolute paths,
we'd need to decide how to handle:
 - foo/bar      (relative to CWD?)
 - foo          (search PATH / LD_LIBRARY_PATH, or also relative to CWD?)
 - foo.zip!/bar (normalize_path() requires an absolute path)

The linker adjusts the argc/argv passed to main() and to constructor
functions to hide the initial linker argument, but doesn't adjust the auxv
vector or files like /proc/self/{exe,cmdline,auxv,stat}. Those files will
report that the kernel loaded the linker as an executable.

I think the linker_logger.cpp change guarding against (g_argv == NULL)
isn't actually necessary, but it seemed like a good idea given that I'm
delaying initialization of g_argv until after C++ constructors have run.

Bug: http://b/112050209
Test: bionic unit tests
Change-Id: I846faf98b16fd34218946f6167e8b451897debe5

0 files changed, 0 insertions, 0 deletions