add asan_ignore - which errors to ignore

"clang -fsanitize=undefined" produces lots of false positives.
This file allows certain functions to be excluded from checking.
Use it as:

    clang -fsanitize=undefined -fsanitize-blacklist=`pwd`/asan_ignore

diff --git a/MANIFEST b/MANIFEST
index 844b7ae..b3f0f2d 100644 (file)
--- a/MANIFEST
+++ b/MANIFEST
@@ -1,4 +1,5 @@
 Artistic               The "Artistic License"
+asan_ignore            Errors to skip under clang's Addresss Sanitizer
 AUTHORS                        Contact info for contributors
 autodoc.pl             Creates pod/perlintern.pod and pod/perlapi.pod
 av.c                   Array value code

diff --git a/asan_ignore b/asan_ignore
new file mode 100644 (file)
index 0000000..5a8bc5c
--- /dev/null
+++ b/asan_ignore
@@ -0,0 +1,19 @@
+# This file intended to be used with clang as
+#
+#  clang -fsanitize=foo -fsanitize-blacklist=`pwd`/asan_ignore
+#
+# It lists those files / functions that clang's Address Sanitizer should
+# ignore.
+#
+# See http://clang.llvm.org/docs/SanitizerSpecialCaseList.html.
+
+
+# The pp functions used under 'use integer' shouldn't warn about
+# integer overflow etc.
+#
+# Unfortunately there doesn't seem to be any way to disable just specific
+# errors (i.e. the integer overflow ones). The manual implies that you can
+# suffix with =foo for a "tool-specific category", but neither =undefined
+# nor =signed-integer-overflow worked.
+
+fun:Perl_pp_i_*