tce-load -i compiletc meson 

wget https://download.gnome.org/sources/libsigc++/2.12/libsigc++-2.12.1.tar.xz

cd libsigc++-2.12.1

mkdir build
cd build

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain -Dbuild-examples=false -Dbuild-tests=false

ninja [0m 2.91s]
sudo ninja install

libsigc++ 2.12.1

         Maintainer mode: if-git-build (false)
       Compiler warnings: min (warning_level: 1, werror: false)
    Build deprecated API: true
Build HTML documentation: if-maintainer-mode (false)
          XML validation: false (requires xmllint with Relax NG and DocBook V5.0 support)
               Build PDF: false
  Build example programs: false
     Build test programs: false
               Benchmark: false
Directories:
                  prefix: /usr/local
              includedir: /usr/local/include
        includesigcxxdir: /usr/local/include/sigc++-2.0
                  libdir: /usr/local/lib
        includeconfigdir: /usr/local/lib/sigc++-2.0/include
            pkgconfigdir: /usr/local/lib/pkgconfig
                 datadir: /usr/local/share
                  docdir: /usr/local/share/doc/libsigc++-2.0
              devhelpdir: /usr/local/share/devhelp/books/libsigc++-2.0
             tutorialdir: /usr/local/share/doc/libsigc++-2.0/tutorial
------
Build targets in project: 35

libsigc++ 2.12.1

  User defined options
    buildtype     : plain
    localstatedir : /var
    prefix        : /usr/local
    build-examples: false
    build-tests   : false