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Migrate feature detection macro checks from #ifdef to #if.

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The #if predicate evaluates to false if the macro is undefined, or
defined to 0. #ifdef (and its synonym #if defined) evaluates to false
only if the macro is undefined.

The new setup allows differentiating between setting a macro to 0 (to
express that the capability definitely does not exist / should not be
used) and leaving a macro undefined (to express not knowing whether a
capability exists / not caring if a capability is used).

PiperOrigin-RevId: 391094241
This commit is contained in:
Victor Costan
2021-08-16 18:22:31 +00:00
committed by Victor Costan
parent a8400f1fab
commit cbb83a1d64
7 changed files with 44 additions and 43 deletions
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2
snappy-test.cc
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@@ -151,7 +151,7 @@ LogMessageCrash::~LogMessageCrash() {
#pragma warning(pop)
#endif
#ifdef HAVE_LIBZ
#if HAVE_LIBZ
ZLib::ZLib()
: comp_init_(false),