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Export of internal Abseil changes

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803abc2dcad8b2354c988e9bf58dac4a17683832 by Gennadiy Rozental <rogeeff@google.com>:

Avoid warning when RTTI is not enabled.

PiperOrigin-RevId: 294247546

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5a7b0b4d07d1d6e56fbb0b0ffbf4f8fcab772dbf by Derek Mauro <dmauro@google.com>:

Add a public Abseil FAQ

PiperOrigin-RevId: 294226960

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6945c4a6df7d7679711fea31aacf4fba6ac7baa1 by Gennadiy Rozental <rogeeff@google.com>:

Re-enable type mismatch check, which works in all the cases including shared libraries.

We will use RTTI in case when our hand written approximation of it reports a type mismatch. This way we can ensure that if a flag is defined in one shared object and referenced in another we do not report spurious errors.

PiperOrigin-RevId: 293905563
GitOrigin-RevId: 803abc2dcad8b2354c988e9bf58dac4a17683832
Change-Id: I1a23776d227ed2734c2e7183323786b7a95c3cc7
This commit is contained in:
Abseil Team 2020-02-10 10:18:03 -08:00 • committed by Mark Barolak
parent d95d156716
commit bf78e97730
9 changed files with 229 additions and 71 deletions
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8
absl/flags/config.h
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@ -56,4 +56,12 @@
#define ABSL_FLAGS_INTERNAL_ATOMIC_DOUBLE_WORD 1
#endif
// ABSL_FLAGS_INTERNAL_HAS_RTTI macro is used for selecting if we can use RTTI
// for flag type identification.
#ifdef ABSL_FLAGS_INTERNAL_HAS_RTTI
#error ABSL_FLAGS_INTERNAL_HAS_RTTI cannot be directly set
#elif !defined(__GNUC__) || defined(__GXX_RTTI)
#define ABSL_FLAGS_INTERNAL_HAS_RTTI 1
#endif // !defined(__GNUC__) || defined(__GXX_RTTI)
#endif // ABSL_FLAGS_CONFIG_H_