Unexpected behavior when using algorithm::trim() to remove spaces about algorithm HOT 3 OPEN

Since you didn't provide an actual test program, I wrote my own:

#include <iostream>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/trim.hpp>

namespace ba = boost::algorithm;

int main ()
{
	std::string s("two, pi");
	std::vector<std::string> v;
	ba::split(v, s, ba::is_any_of(","));
	for (auto const &st : v) 
		std::cout << "'" << st << "'" << std::endl;
	std::cout << "-----" << std::endl;
	for (auto st : v)
	{
		ba::trim(st);
		std::cout << "'" << st << "'" << std::endl;
	}
}

$ clang++ -std=c++14 -I $BOOST boost.cpp && ./a.out 
'two'
' pi'
-----
'two'
'pi'

That looks fine to me.

One big BUT: this only happens to Linux cross-compiler targeting Android platform, downloaded from Android NDK page

Can you run this program on your platform and tell me what happens?
Also, what version of Boost are you using?

from algorithm.

Thanks! That I did not providing a minimal example was lazy on my part.

Here is the result of the test program you provided:

export compile=/mnt/d/tools/android/android_toolchain_linux/bin/aarch64-linux-android-clang++

$ $compile -std=c++14 -I /mnt/d/repo/boost_1_68_0 src/test.cpp
$ adb push a.out data/local && adb shell ./data/local/a.out
a.out: 1 file pushed. 8.8 MB/s (223432 bytes in 0.024s)
'two'
' pi'
-----
'two'
' p'

The Boost version I have is 1.68.0. Compiled with Android cross compiler under Windows Linux Subsystem

from algorithm.

The only difference that I can see is that you're using Boost 1.68.0, and I'm using trunk.
However, I don't think that code has changed since before 1.68.0 (checks - nope)

That's very odd. And the fact that it only fails when cross-compiling to ARM suggests a tool problem. Doesn't rule out a bug in Boost, though.

from algorithm.