Abseil LTS 20210324, Patch 2
* Fixes build with glibc 2.34 (#952)
* Fixes "illegal thread local variable" on some Apple platforms (#954, #965)
diff --git a/absl/base/internal/thread_identity.cc b/absl/base/internal/thread_identity.cc
index 6ea010e..9950e63 100644
--- a/absl/base/internal/thread_identity.cc
+++ b/absl/base/internal/thread_identity.cc
@@ -120,10 +120,10 @@
ABSL_THREAD_IDENTITY_MODE == ABSL_THREAD_IDENTITY_MODE_USE_CPP11
// Please see the comment on `CurrentThreadIdentityIfPresent` in
-// thread_identity.h. Because DLLs cannot expose thread_local variables in
-// headers, we opt for the correct-but-slower option of placing the definition
-// of this function only in a translation unit inside DLL.
-#if defined(ABSL_BUILD_DLL) || defined(ABSL_CONSUME_DLL)
+// thread_identity.h. When we cannot expose thread_local variables in
+// headers, we opt for the correct-but-slower option of not inlining this
+// function.
+#ifndef ABSL_INTERNAL_INLINE_CURRENT_THREAD_IDENTITY_IF_PRESENT
ThreadIdentity* CurrentThreadIdentityIfPresent() { return thread_identity_ptr; }
#endif
#endif
diff --git a/absl/base/internal/thread_identity.h b/absl/base/internal/thread_identity.h
index 9ee651a..6e25b92 100644
--- a/absl/base/internal/thread_identity.h
+++ b/absl/base/internal/thread_identity.h
@@ -236,13 +236,18 @@
#error Thread-local storage not detected on this platform
#endif
-// thread_local variables cannot be in headers exposed by DLLs. However, it is
-// important for performance reasons in general that
-// `CurrentThreadIdentityIfPresent` be inlined. This is not possible across a
-// DLL boundary so, with DLLs, we opt to have the function not be inlined. Note
+// thread_local variables cannot be in headers exposed by DLLs or in certain
+// build configurations on Apple platforms. However, it is important for
+// performance reasons in general that `CurrentThreadIdentityIfPresent` be
+// inlined. In the other cases we opt to have the function not be inlined. Note
// that `CurrentThreadIdentityIfPresent` is declared above so we can exclude
-// this entire inline definition when compiling as a DLL.
-#if !defined(ABSL_BUILD_DLL) && !defined(ABSL_CONSUME_DLL)
+// this entire inline definition.
+#if !defined(__APPLE__) && !defined(ABSL_BUILD_DLL) && \
+ !defined(ABSL_CONSUME_DLL)
+#define ABSL_INTERNAL_INLINE_CURRENT_THREAD_IDENTITY_IF_PRESENT 1
+#endif
+
+#ifdef ABSL_INTERNAL_INLINE_CURRENT_THREAD_IDENTITY_IF_PRESENT
inline ThreadIdentity* CurrentThreadIdentityIfPresent() {
return thread_identity_ptr;
}
diff --git a/absl/debugging/failure_signal_handler.cc b/absl/debugging/failure_signal_handler.cc
index a9ed6ef..3ddebd7 100644
--- a/absl/debugging/failure_signal_handler.cc
+++ b/absl/debugging/failure_signal_handler.cc
@@ -136,7 +136,8 @@
#else
const size_t page_mask = sysconf(_SC_PAGESIZE) - 1;
#endif
- size_t stack_size = (std::max(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
+ size_t stack_size =
+ (std::max<size_t>(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
#if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
defined(ABSL_HAVE_MEMORY_SANITIZER) || defined(ABSL_HAVE_THREAD_SANITIZER)
// Account for sanitizer instrumentation requiring additional stack space.
