Export of internal Abseil changes

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510cd0bc2ff9cf21e1e960264d179fa333a88612 by Derek Mauro <dmauro@google.com>:

Removes the static initializer for VDSOSupport as requested by Chromium.
The call is moved to InitializeSymbolizer().

PiperOrigin-RevId: 319275021

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0c91944889ad2bd10bc8080f4cd8083ca1d5de46 by Derek Mauro <dmauro@google.com>:

Check for the lock_returned attribute before using it

PiperOrigin-RevId: 319273193

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1001fa71bfb850f00502777f787aeff6e80654ca by Derek Mauro <dmauro@google.com>:

Remove a no longer relevant MSVC code guard

PiperOrigin-RevId: 319266085

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a80caee79eb3f377c6bf97bec6b692c55169fe53 by Abseil Team <absl-team@google.com>:

Bug fix to StrFormat %a rounding behavior for `long double`.

PiperOrigin-RevId: 319238900

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fdec318c449f1ca586145397099b03d973b738c4 by Abseil Team <absl-team@google.com>:

Add test cases for absl::Time +/- absl::InfiniteDuration() ==
absl::Infinite{Future|Past}.

PiperOrigin-RevId: 319223053
GitOrigin-RevId: 510cd0bc2ff9cf21e1e960264d179fa333a88612
Change-Id: I4b8932fb0ec6ab9c868450faf4ed837092a7c0c0

2 files changed, 6 insertions, 12 deletions

diff --git a/absl/debugging/internal/vdso_support.cc b/absl/debugging/internal/vdso_support.cc
index 1e8a78ac..19deb3cf 100644
--- a/absl/debugging/internal/vdso_support.cc
+++ b/absl/debugging/internal/vdso_support.cc
@@ -175,18 +175,6 @@ int GetCPU() {
   return ret_code == 0 ? cpu : ret_code;
 }
 
-// We need to make sure VDSOSupport::Init() is called before
-// InitGoogle() does any setuid or chroot calls.  If VDSOSupport
-// is used in any global constructor, this will happen, since
-// VDSOSupport's constructor calls Init.  But if not, we need to
-// ensure it here, with a global constructor of our own.  This
-// is an allowed exception to the normal rule against non-trivial
-// global constructors.
-static class VDSOInitHelper {
- public:
-  VDSOInitHelper() { VDSOSupport::Init(); }
-} vdso_init_helper;
-
 }  // namespace debugging_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/debugging/symbolize_elf.inc b/absl/debugging/symbolize_elf.inc
index 328869f1..b7f8663c 100644
--- a/absl/debugging/symbolize_elf.inc
+++ b/absl/debugging/symbolize_elf.inc
@@ -83,6 +83,12 @@ ABSL_NAMESPACE_BEGIN
 static char *argv0_value = nullptr;
 
 void InitializeSymbolizer(const char *argv0) {
+#ifdef ABSL_HAVE_VDSO_SUPPORT
+  // We need to make sure VDSOSupport::Init() is called before any setuid or
+  // chroot calls, so InitializeSymbolizer() should be called very early in the
+  // life of a program.
+  absl::debugging_internal::VDSOSupport::Init();
+#endif
   if (argv0_value != nullptr) {
     free(argv0_value);
     argv0_value = nullptr;