Export of internal Abseil changes

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77cd6291781bc39e8472c706163d6951fe2ae573 by Derek Mauro <dmauro@google.com>:

absl::uint128: Use intrinsics for more operations when available

This change also inlines the division and modulus operators when
intrinsics are available for better code generation.

Fixes #987

PiperOrigin-RevId: 389895706

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fa23339584599e07ebcb4d0a857e2553b017757c by Abseil Team <absl-team@google.com>:

only hide retired flags if human-readable output is requested

PiperOrigin-RevId: 389835452

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f1111f2b88359d4b253d4d81681c8a488458a36e by Martijn Vels <mvels@google.com>:

Add helpers IsFlat(), IsExternal(), etc to improve readability

PiperOrigin-RevId: 389779333

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785b8712261e41695ebeeb64b4317f93b37adc11 by Martijn Vels <mvels@google.com>:

Split off 'concat' and 'btree' RepMemoryUsageLeaf and RepMemoryUsageDataEdge

PiperOrigin-RevId: 389701120

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5264bffebffc2b377bf7e18f0ce69a3ed38c6629 by CJ Johnson <johnsoncj@google.com>:

Eagerly destroy `Callback` in `absl::Cleanup`

PiperOrigin-RevId: 389678813

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a05312f0668458e97c50ca932c8f974c1508ebf2 by Abseil Team <absl-team@google.com>:

Have one instance of empty_group per program, rather than one per translation unit.

https://stackoverflow.com/questions/185624/static-variables-in-an-inlined-function

PiperOrigin-RevId: 389185845
GitOrigin-RevId: 77cd6291781bc39e8472c706163d6951fe2ae573
Change-Id: Iac8d9cb27707a9562c831c77a552d1fb4bb0405f

1 files changed, 13 insertions, 4 deletions

diff --git a/absl/flags/internal/usage.cc b/absl/flags/internal/usage.cc
index 949709e8..a883567f 100644
--- a/absl/flags/internal/usage.cc
+++ b/absl/flags/internal/usage.cc
@@ -17,6 +17,7 @@
 
 #include <stdint.h>
 
+#include <algorithm>
 #include <functional>
 #include <map>
 #include <ostream>
@@ -255,9 +256,6 @@ void FlagsHelpImpl(std::ostream& out, PerFlagFilter filter_cb,
       matching_flags;
 
   flags_internal::ForEachFlag([&](absl::CommandLineFlag& flag) {
-    // Ignore retired flags.
-    if (flag.IsRetired()) return;
-
     // If the flag has been stripped, pretend that it doesn't exist.
     if (flag.Help() == flags_internal::kStrippedFlagHelp) return;
 
@@ -275,6 +273,14 @@ void FlagsHelpImpl(std::ostream& out, PerFlagFilter filter_cb,
   absl::string_view file_separator;     // controls blank lines between files
   for (auto& package : matching_flags) {
     if (format == HelpFormat::kHumanReadable) {
+      // Hide packages with only retired flags
+      bool all_package_flags_are_retired = true;
+      for (const auto& flags_in_file : package.second) {
+        for (const auto* flag : flags_in_file.second) {
+          all_package_flags_are_retired &= flag->IsRetired();
+        }
+      }
+      if (all_package_flags_are_retired) continue;
       out << package_separator;
       package_separator = "\n\n";
     }
@@ -334,8 +340,11 @@ void FlagsHelpImpl(std::ostream& out,
 // Produces the help message describing specific flag.
 void FlagHelp(std::ostream& out, const CommandLineFlag& flag,
               HelpFormat format) {
-  if (format == HelpFormat::kHumanReadable)
+  if (format == HelpFormat::kHumanReadable) {
+    // Ignore retired flags
+    if (flag.IsRetired()) return;
     flags_internal::FlagHelpHumanReadable(flag, out);
+  }
 }
 
 // --------------------------------------------------------------------