Bugzilla Bug 259945: configure.in: use $ORIGIN with both GCC and Sun

compiler on Solaris. build/unix/run-mozilla.sh: changed '-h "$MOZ_PROGRAM"'
to '-h "libmozjs.so"' because firefox-bin and thunderbird-bin are not
symbol links under dist/bin.  The patch is contributed by Boying Lu
<brian.lu@sun.com>. r=wtc. sr=neil.parkwaycc.co.uk.

build/unix/run-mozilla.sh

@@ -328,10 +328,24 @@ if [ -z "$MRE_HOME" ]; then
 fi
 ##
 ## Set LD_LIBRARY_PATH
-## On Solaris we use $ORIGIN instead of LD_LIBRARY_PATH unless
-## $MOZ_PROGRAM is a symbolic link, in this case we need to set
-## LD_LIBRARY_PATH because $ORIGIN doesn't work on a symbolic link.
-if [ `uname -s` != "SunOS" -o -h "$MOZ_PROGRAM" ]
+##
+## On Solaris we use $ORIGIN (set in RUNPATH) instead of LD_LIBRARY_PATH 
+## to locate shared libraries. 
+##
+## When a shared library is a symbolic link, $ORIGIN will be replaced with
+## the real path (i.e., what the symbolic link points to) by the runtime
+## linker.  For example, if dist/bin/libmozjs.so is a symbolic link to
+## js/src/libmozjs.so, $ORIGIN will be "js/src" instead of "dist/bin".
+## So the runtime linker will use "js/src" NOT "dist/bin" to locate the
+## other shared libraries that libmozjs.so depends on.  This only happens
+## when a user (developer) tries to start firefox, thunderbird, or seamonkey
+## under dist/bin. To solve the problem, we should rely on LD_LIBRARY_PATH
+## to locate shared libraries.
+##
+## Note: 
+##  We choose libmozjs.so as a representative shared library. If it is 
+##  a symbolic link, all other shared libraries are symbolic links also.
+if [ `uname -s` != "SunOS" -o -h "$MOZ_DIST_BIN/libmozjs.so" ]
 then
 	LD_LIBRARY_PATH=${MOZ_DIST_BIN}:${MOZ_DIST_BIN}/plugins:${MRE_HOME}${LD_LIBRARY_PATH+":$LD_LIBRARY_PATH"}
 fi 

configure.in

@@ -2019,14 +2019,15 @@ dnl the qsort routine under solaris is faulty
     AC_DEFINE(SOLARIS)
     TARGET_NSPR_MDCPUCFG='\"md/_solaris32.cfg\"'
     SYSTEM_MAKEDEPEND=
+    # $ORIGIN/.. is for shared libraries under components/ to locate shared
+    # libraries one level up (e.g. libnspr4.so)
+    LDFLAGS="$LDFLAGS -R '\$\$ORIGIN:\$\$ORIGIN/..'"
     if test -z "$GNU_CC"; then
        NS_USE_NATIVE=1
        AC_DEFINE(NSCAP_DISABLE_DEBUG_PTR_TYPES)
        CFLAGS="$CFLAGS -xstrconst -xbuiltin=%all"
        CXXFLAGS="$CXXFLAGS -xbuiltin=%all -features=tmplife -norunpath"
-       # $ORIGIN/.. is for shared libraries under components/ to locate shared
-       # libraries one level up (e.g. libnspr4.so)
-       LDFLAGS="-xildoff -zlazyload -zcombreloc $LDFLAGS -R '\$\$ORIGIN:\$\$ORIGIN/..'"
+       LDFLAGS="-xildoff -zlazyload -zcombreloc $LDFLAGS"
        MOZ_OPTIMIZE_FLAGS="-xO4"
        MKSHLIB='$(CXX) $(CXXFLAGS) $(DSO_PIC_FLAGS) $(DSO_LDOPTS) -h $@ -o $@'
        MKCSHLIB='$(CC) $(CFLAGS) $(DSO_PIC_FLAGS) -G -Wl,-z -Wl,muldefs -h $@ -o $@'