std::all_of becomes constexpr in C++20. I'm not sure it results in better
performance.

Found with useStlAlgorithm
Signed-off-by: Rosen Penev <rosenp@gmail.com>

_exit and std::_Exit are identical, expect the latter is standard C++.

Added several functions to the std namespace as a result of headers.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

This has nothing to do with uClibc. It has everything to do with gcc's
libstdc++.

C99 math can be compile time disabled for it. Check for that and use boost
lround when std is not available.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

lrint is a configurable version of lround that behaves either as round,
floor, ceil, or trunc based on setting the proper FE_ macro using
fset/getround. Given that it's not set at all and that it defaults to
round behavior, simply replace with round.

Also removed the util/Math defines.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with invalidPrintfArgType_sint
Signed-off-by: Rosen Penev <rosenp@gmail.com>

It's available there.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

It's available with uClibc-ng. It also offers overloads.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with constVariable
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Regression from 973c87b3

The entire section falls under the else path of #ifdef _WIN32. Checking
for it makes no sense. Probably some refactoring mistake.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

release v0.21.21

Found with modernize-use-nodiscard
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-default-member-init
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with readability-redundant-access-specifiers
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Documentation says the limit is 5, but it was really 10 (at least
since 2004).  But since MPD wants to promote using many small clients
idling around, and these clients consume only very few resources, it
seems reasonable to raise this limit's default value.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with -Wdouble-promotion
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Merge remote-tracking branches 'neheb/fwhfggwe', 'neheb/nvm2', 'neheb/nvm22', 'neheb/bvm' and 'neheb/cl2'

Found with -Wunreachable-code-break
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with -Wextra-semi
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with clang's -Winconsistent-missing-destructor-override
Signed-off-by: Rosen Penev <rosenp@gmail.com>

[[maybe_unused]] (introduced in C++17) is standard C++.

https://clang.llvm.org/docs/AttributeReference.html#maybe-unused-unused
says that this is equivalent to the GNU unused attribute.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

[[nodiscard] (introduced in C++17) can be used instead.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

[[deprecated]] (introduced in C++14) may be used instead.
Signed-off-by: Rosen Penev <rosenp@gmail.com>