New submission from Jeffrey Walton:
From Python head in mercurial.
When building Python under Clang's sanitizers, we provide a couple of flags to
instrument binaries with the sanitizers. For example:
export CC=/usr/local/bin/clang
export CXX=/usr/local/bin/clang++
export CFLAGS=-g3 -fsanitize=undefined -fsanitize=address
export CXXFLAGS=-g3 -fsanitize=undefined -fsanitize=address -fno-sanitize=vptr
./configure
make
However, `make` will fail due to some missing sanitizer libraries. The
libraries are added at the link stage by Clang, but the invocation must include
the -fsanitize=... flags.
The recipe for $(BUILDPYTHON) in the Makefile does not include necessary CFLAGS:
# Build the interpreter
$(BUILDPYTHON): Modules/python.o $(LIBRARY) $(LDLIBRARY) $(PY3LIBRARY)
$(LINKCC) $(PY_LDFLAGS) $(LINKFORSHARED) -o $@ Modules/python.o
$(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)
The result is a failed link when building with the sanitizers.
It would be great if the sanizter flags (-fsanitize=undefined
-fsanitize=address -fno-sanitize=vptr) were cherry picked from the FLAGS by the
build system and added to the recipe as required:
$(BUILDPYTHON): Modules/python.o $(LIBRARY) $(LDLIBRARY) $(PY3LIBRARY)
$(LINKCC) -fsanitize=undefined -fsanitize=address -fno-sanitize=vptr
$(PY_LDFLAGS) $(LINKFORSHARED) ...
Please consider picking up the sanitizer flags and adding them to the build
rule.
--
components: Build
hgrepos: 220
messages: 213661
nosy: Jeffrey.Walton
priority: normal
severity: normal
status: open
title: Cherry pick CFLAGS, add to flags for $(BUILDPYTHON) Makefile rule
type: enhancement
versions: Python 3.5
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http://bugs.python.org/issue20935
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