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build: improve builtin_clz* detection

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The way we currently test with AC_CHECK_DECLS do not work with Clang:
```bash
configure:21492: clang++-10 -std=c++11 -c -g -O2  -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS conftest.cpp >&5
conftest.cpp💯10: error: builtin functions must be directly called
  (void) __builtin_clz;
         ^
1 error generated.
```

This also removes the __builtin_clz() check, as we don't actually use
it anywhere, and it's trvial to re-add detection if we do start using
it at some point.
This commit is contained in:
fanquake
2020-06-29 11:24:25 +08:00
parent d3a5dbfd1f
commit 9952242c03
3 changed files with 17 additions and 15 deletions
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12
build_msvc/bitcoin_config.h
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@@ -137,18 +137,6 @@
don't. */
#define HAVE_DECL_STRNLEN 1
/* Define to 1 if you have the declaration of `__builtin_clz', and to 0 if you
don't. */
//#define HAVE_DECL___BUILTIN_CLZ 1
/* Define to 1 if you have the declaration of `__builtin_clzl', and to 0 if
you don't. */
//#define HAVE_DECL___BUILTIN_CLZL 1
/* Define to 1 if you have the declaration of `__builtin_clzll', and to 0 if
you don't. */
//#define HAVE_DECL___BUILTIN_CLZLL 1
/* Define to 1 if you have the <dlfcn.h> header file. */
/* #undef HAVE_DLFCN_H */