scons: Try to handle problems with gcc, lto and partial linking.

gcc has had a lot of problems with incremental linking and partial linking
at the same time. Basically, the partial link assumes that it's the only
link that's going to happen, and it converts weak external symbols into
regular external symbols. Then when the real final link happens, those
symbols are duplicated and the link fails.

Versions of gcc 6 and greater add an option called -flinker-output which
lets you tell the linker to do an incremental link. Unfortunately, other
bugs make that fail, and so gcc 6 doesn't work either. Hopefully version
7 works better.

A --force-lto option was added so that, when only one of lto and partial
linking is available, you can switch from having partial linking to having
lto.

Change-Id: I5e293f5cfb07a14343dc74030d99cb161fb8bbbe
Reviewed-on: https://gem5-review.googlesource.com/3680
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

src/SConscript

@@ -957,7 +957,7 @@ def variantd(*path):
 # environment 'env' with modified object suffix and optional stripped
 # binary.  Additional keyword arguments are appended to corresponding
 # build environment vars.
-def makeEnv(env, label, objsfx, strip = False, **kwargs):
+def makeEnv(env, label, objsfx, strip=False, disable_partial=False, **kwargs):
     # SCons doesn't know to append a library suffix when there is a '.' in the
     # name.  Use '_' instead.
     libname = variant('gem5_' + label)
@@ -1059,6 +1059,14 @@ def makeEnv(env, label, objsfx, strip = False, **kwargs):
         if not srcs:
             continue
 
+        # If partial linking is disabled, add these sources to the build
+        # directly, and short circuit this loop.
+        if disable_partial:
+            for s in srcs:
+                static_objs.append(make_obj(s, True))
+                shared_objs.append(make_obj(s, False))
+            continue
+
         # Set up the static partially linked objects.
         source_objs = [ make_obj(s, True) for s in srcs ]
         file_name = new_env.subst("${OBJPREFIX}lib${OBJSUFFIX}.partial")
@@ -1204,10 +1212,14 @@ def makeEnvirons(target, source, env):
 
     # "Fast" binary
     if 'fast' in needed_envs:
+        disable_partial = \
+                env.get('BROKEN_INCREMENTAL_LTO', False) and \
+                GetOption('force_lto')
         makeEnv(env, 'fast', '.fo', strip = True,
                 CCFLAGS = Split(ccflags['fast']),
                 CPPDEFINES = ['NDEBUG', 'TRACING_ON=0'],
-                LINKFLAGS = Split(ldflags['fast']))
+                LINKFLAGS = Split(ldflags['fast']),
+                disable_partial=disable_partial)
 
     # Profiled binary using gprof
     if 'prof' in needed_envs: