CmmToLlvm: Declare signature for memcmpwip/T18857

Otherwise `opt` fails with:

    error: use of undefined value '@memcmp$def'

1 files changed, 10 insertions, 0 deletions

diff --git a/testsuite/driver/testlib.py b/testsuite/driver/testlib.py
index 8ef5a8450c..4828df9736 100644
--- a/testsuite/driver/testlib.py
+++ b/testsuite/driver/testlib.py
@@ -2216,6 +2216,13 @@ def normalise_errmsg(s: str) -> str:
         s = re.sub('Failed to remove file (.*); error= (.*)$', '', s)
         s = re.sub('DeleteFile "(.+)": permission denied \(Access is denied\.\)(.*)$', '', s)
 
+    # filter out unsupported GNU_PROPERTY_TYPE (5), which is emitted by LLVM10
+    # and not understood by older binutils (ar, ranlib, ...)
+    s = modify_lines(s, lambda l: re.sub('^(.+)warning: (.+): unsupported GNU_PROPERTY_TYPE \(5\) type: 0xc000000(.*)$', '', l))
+
+    # filter out nix garbage, that just keeps on showing up as errors on darwin
+    s = modify_lines(s, lambda l: re.sub('^(.+)\.dylib, ignoring unexpected dylib file$','', l))
+
     return s
 
 # normalise a .prof file, so that we can reasonably compare it against
@@ -2286,6 +2293,9 @@ def normalise_output( s: str ) -> str:
     s = re.sub('([^\\s])\\.exe', '\\1', s)
     s = normalise_callstacks(s)
     s = normalise_type_reps(s)
+    # ghci outputs are pretty unstable with -fexternal-dynamic-refs, which is
+    # requires for -fPIC
+    s = re.sub('  -fexternal-dynamic-refs\n','',s)
     return s
 
 def normalise_asm( s: str ) -> str: