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Use popcount64 from libc when available (#152)

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* Use popcount64 from libc when available

Without this, we get a compiler error on NetBSD because the one in
libc has a slightly different prototype.

libcpuid_util.c:78:12: error: conflicting types for 'popcount64'
   78 | static int popcount64(uint64_t mask)
      |            ^~~~~~~~~~
In file included from /nix/store/155rj8nqh3xd80vpa8hl35p3hk7pacys-include-netbsd-8.0/include/string.h:98,
                 from libcpuid_util.c:30:
/nix/store/155rj8nqh3xd80vpa8hl35p3hk7pacys-include-netbsd-8.0/include/strings.h:61:14: note: previous declaration of 'popcount64' was here
   61 | unsigned int popcount64(__uint64_t) __constfunc;
      |              ^~~~~~~~~~

* Return unsigned int from popcount64

Matches NetBSD libc, where popcount64 originates.
This commit is contained in:
Alyssa Ross 2021-07-15 22:55:36 +00:00 • committed by GitHub
commit 1acaf9980b
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2 changed files with 9 additions and 2 deletions
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2
configure.ac
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@ -43,6 +43,8 @@ LT_INIT
AM_CPPFLAGS="$CPPFLAGS"
AC_CHECK_HEADERS([stdint.h])
AC_CHECK_FUNCS([popcount64])
AC_CHECK_PROGS([DOXYGEN], [doxygen])
AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])