trying to get the sanitization to work here

.travis.yml

@@ -97,8 +97,8 @@ before_install:
 
 script:
     # `--coverage` flags required to generate coverage info for Coveralls
-    - ../../../b2 with-valgrind address-model=64 architecture=x86 testing.launcher=valgrind valgrind=on toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags=$LDFLAGS -sBOOST_BUILD_PATH=.  > python $BOOST/libs/$PROJECT_TO_TEST/filter_section_warning.py
-    - ../../../b2 without-valgrind address-model=64 architecture=x86 toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags=$LDFLAGS -sBOOST_BUILD_PATH=.  > python $BOOST/libs/$PROJECT_TO_TEST/filter_section_warning.py
+    - python $BOOST/libs/$PROJECT_TO_TEST/filter_section_warning.py ../../../b2 with-valgrind address-model=64 architecture=x86 testing.launcher=valgrind valgrind=on toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags=$LDFLAGS -sBOOST_BUILD_PATH=.
+    - python $BOOST/libs/$PROJECT_TO_TEST/filter_section_warning.py ../../../b2 without-valgrind address-model=64 architecture=x86 toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags=$LDFLAGS -sBOOST_BUILD_PATH=.
 after_success:
     # Copying Coveralls data to a separate folder
     - mkdir -p $TRAVIS_BUILD_DIR/coverals

filter_section_warning.py

@@ -1,16 +1,21 @@
 #!/usr/bin/python
 #
-# filter-noisy-assembler-warnings.py
-# Author: Stuart Berg
 
 import sys
+import subprocess
 
-for line in sys.stdin:
+b2 = subprocess.Popen(sys.argv[1:], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
+
+while not b2.returncode:
+    line = b2.stdout.readline()
+    if not line: break;
     # If line is a 'noisy' warning, don't print it or the following two lines.
     if ('warning: section' in line and 'is deprecated' in line
             or 'note: change section name to' in line):
         next(sys.stdin)
         next(sys.stdin)
     else:
-        sys.stderr.write(line)
-        sys.stderr.flush()
+        sys.stdout.write(line)
+        sys.stdout.flush()
+
+exit(b2.returncode)