Make profiling work for ELF. gprof now autodetects the format of

the executable file, so it will work for both a.out and ELF format
files.  I have split the object format specific code into separate
source files.  It's cleaner than it was before, but it's still
pretty crufty.

Don't cheat on your make world for this update.  A lot of things
have to be rebuilt for it to work, including the compiler and all
of the profiled libraries.

1 files changed, 9 insertions, 2 deletions

diff --git a/usr.bin/gprof/gprof.1 b/usr.bin/gprof/gprof.1
index 76b5543..dc6f369 100644
--- a/usr.bin/gprof/gprof.1
+++ b/usr.bin/gprof/gprof.1
@@ -113,6 +113,7 @@ The static call graph of the program is discovered by a heuristic
 that examines the text space of the object file.
 Static-only parents or children are shown
 with call counts of 0.
+This option is not supported on some architectures.
 .It Fl C Ar count
 Find a minimal set of arcs that can be broken to eliminate all cycles with
 .Ar count
@@ -210,8 +211,14 @@ to accumulate profile data across several runs of an
 .Pa a.out
 file.
 .It Fl u
-Suppresses the printing of functions whose name does not begin with
-an underscore.
+Suppresses the printing of functions whose names are not visible to
+C programs.  For the ELF object format, this means names that
+contain the
+.Ql \&.
+character.  For the a.out object format, it means names that do not
+begin with a
+.Ql _
+character.
 All relevant information about such functions belongs to the
 (non-suppressed) function with the next lowest address.
 This is useful for eliminating "functions" that are just labels