OS X: do not use -ld_classic. Filter out some ld warnings when doctes…

…ting.

src/bin/sage-env

@@ -373,32 +373,6 @@ if [ -n "$SAGE_LOCAL" ]; then
     # Construct and export LDFLAGS
     if [ "$UNAME" = "Darwin" ]; then
        LDFLAGS="-L$SAGE_LOCAL/lib $LDFLAGS"
-       # On OS X, use the old linker if it is available.
-       # if "ld-classic" is present in the selected XCode
-       # toolchain, add "-Wl,-ld_classic" to LDFLAGS (see #36599) unless
-       # LD is already set, as it will be with conda on macOS.  When the
-       # selected toolchain is in the Xcode app the output of "xcode-select -p"
-       # is "/Applications/Xcode.app/Contents/Developer", but "ld-classic" is
-       # not in the subdirectory "usr/bin/" but rather in the subdirectory
-       # "Toolchains/XcodeDefault.xctoolchain/usr/bin/".  (See #37237.)
-       if [ -z "$LD" ]; then
-	   # Running xcode-select on a system with no toolchain writes an
-	   # error message to stderr, so redirect stderr to /dev/null. 
-	   XCODE_PATH=$(/usr/bin/xcode-select -p 2> /dev/null)
-	   if [ -n $XCODE_PATH ]; then
-               if [ -x "$XCODE_PATH/usr/bin/ld-classic" -o \
-		       -x "$XCODE_PATH/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld-classic" ]; then
-		   LDFLAGS="$LDFLAGS -Wl,-ld_classic"
-               fi
-           else
-               # On a macOS system with no toolchain we don't want this script
-               # to call gcc because that will also print an error message to
-               # stderr.  We can avoid this by setting AS and LD to their
-               # default values.
-               AS=as
-               LD=ld
-	   fi
-       fi
     fi
     if [ "$UNAME" = "Linux" ]; then
 	LDFLAGS="-L$SAGE_LOCAL/lib -Wl,-rpath,$SAGE_LOCAL/lib $LDFLAGS"

src/sage/doctest/parsing.py

@@ -1516,6 +1516,21 @@ def do_fixup(self, want, got):
             pythran_numpy_warning_regex = re.compile(r'WARNING: Overriding pythran description with argspec information for: numpy\.random\.[a-z_]+')
             got = pythran_numpy_warning_regex.sub('', got)
             did_fixup = True
+
+        if "ld_classic is deprecated" in got:
+            # New warnings as of Oct '24, Xcode 16.
+            ld_warn_regex = re.compile("ld: warning: -ld_classic is deprecated and will be removed in a future release")
+            got = ld_warn_regex.sub('', got)
+            did_fixup = True
+
+        if "duplicate libraries" in got:
+            # New warnings as of Sept '23, OS X 13.6, new command-line
+            # tools. In particular, these seem to come from ld in
+            # Xcode 15.
+            dup_lib_regex = re.compile("ld: warning: ignoring duplicate libraries: .*")
+            got = dup_lib_regex.sub('', got)
+            did_fixup = True
+
         return did_fixup, want, got
 
     def output_difference(self, example, got, optionflags):

src/sage/tests/cmdline.py

@@ -776,4 +776,13 @@ def test_executable(args, input='', timeout=100.0, pydebug_ignore_warnings=False
                 p.stderr.close()
             err.append(s)
 
-    return (''.join(out), ''.join(err), p.wait())
+    # In case out or err contains a quoted string, force the use of
+    # double quotes so that the output is enclosed in single
+    # quotes. This avoids some doctest failures with some versions of
+    # OS X and Xcode.
+    out = ''.join(out)
+    out = out.replace("'", '"')
+    err = ''.join(err)
+    err = err.replace("'", '"')
+
+    return (out, err, p.wait())