MFC r305855, r306297, r306300, r306312-r306313

When MAKEOBJDIRPREFIX points to a case-insensitive file system, the
build can break when different source files create the same object
files (case-insensitivity speaking).  This is the case for object
files compiled with -fpic and shared libraries. The former uses
an extension of ".So", and the latter an extension ".so".  Rename
shared object files from *.So to *.pico to match what NetBSD does.

Also:
 o  Compile _Exit.c as C99_Exit.c, as it conflicts with _exit.s
 o  Add entry to UPDATING
 o  Document .pico extension

1 files changed, 6 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index dab6226..33c15bd 100644
--- a/UPDATING
+++ b/UPDATING
@@ -16,6 +16,12 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20161210:
+	Relocatable object files with the extension of .So have been renamed
+	to use an extension of .pico instead.  The purpose of this change is
+	to avoid a name clash with shared libraries on case-insensitive file
+	systems.  On those file systems, foo.So is the same file as foo.so.
+
 20160622:
 	The libc stub for the pipe(2) system call has been replaced with
 	a wrapper that calls the pipe2(2) system call and the pipe(2)