[Bug sanitizer/70624] New: [6 Regression] Several hundred asan failures with 6.0 on x86_64-apple-darwin10.8

dominiq at lps dot ens.fr gcc-bugzilla@gcc.gnu.org
Mon Apr 11 08:35:00 GMT 2016


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70624

            Bug ID: 70624
           Summary: [6 Regression] Several hundred asan failures with 6.0
                    on x86_64-apple-darwin10.8
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: chefmax at gcc dot gnu.org, dodji at gcc dot gnu.org,
                    dvyukov at gcc dot gnu.org, jakub at gcc dot gnu.org,
                    kcc at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-apple-darwin10.8
            Target: x86_64-apple-darwin10.8
             Build: x86_64-apple-darwin10.8

On x86_64-apple-darwin10.8 I get several hundred asan failures with 6.0 (see
https://gcc.gnu.org/ml/gcc-testresults/2016-04/msg01013.html). Most (if not
all) of them are of the kind

dyld: Symbol not found: _dyldVersionNumber
  Referenced from:
/opt/gcc/build_c/x86_64-apple-darwin10.8.0/i386/libsanitizer/asan/.libs/libasan.3.dylib
  Expected in: flat namespace
 in
/opt/gcc/build_c/x86_64-apple-darwin10.8.0/i386/libsanitizer/asan/.libs/libasan.3.dylib

AFAICT they are related to revision r229111

+bool DyldNeedsEnvVariable() {
+  // If running on OS X 10.11+ or iOS 9.0+, dyld will interpose even if
+  // DYLD_INSERT_LIBRARIES is not set. However, checking OS version via
+  // GetMacosVersion() doesn't work for the simulator. Let's instead check
+  // `dyldVersionNumber`, which is exported by dyld, against a known version
+  // number from the first OS release where this appeared.
+  return dyldVersionNumber < kMinDyldVersionWithAutoInterposition;
+}
+


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