Revert "Revert r224736: "[Sanitizer] Make CommonFlags immutable after initialization.""

Fix test failures by introducing CommonFlags::CopyFrom() to make sure
compiler doesn't insert memcpy() calls into runtime code.

Original commit message:
Protect CommonFlags singleton by adding const qualifier to
common_flags() accessor. The only ways to modify the flags are
SetCommonFlagsDefaults(), ParseCommonFlagsFromString() and
OverrideCommonFlags() functions, which are only supposed to be
called during initialization.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@225088 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_flags.cc b/lib/sanitizer_common/sanitizer_flags.cc
index 3b1ec70fb..684938e44 100644
--- a/lib/sanitizer_common/sanitizer_flags.cc
+++ b/lib/sanitizer_common/sanitizer_flags.cc
@@ -187,6 +187,10 @@ void CommonFlags::ParseFromString(const char *str) {
     malloc_context_size = 1;
 }
 
+void CommonFlags::CopyFrom(const CommonFlags &other) {
+  internal_memcpy(this, &other, sizeof(*this));
+}
+
 static bool GetFlagValue(const char *env, const char *name,
                          const char **value, int *value_length) {
   if (env == 0)