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| [[https://gcc.gnu.org/onlinedocs/libstdc++/manual/parallel_mode_using.html|Parallel STL in gcc]] |
Using profile-guided optimization (PGO)
gcc -O3 -march=native -pg -fprofile-generate ...
# Run a benchmark or program's typical load
gcc -O3 -march=native -fprofile-use ...
Check compiler preprocessor defines
# E.g. check for the version of OpenMP supported
echo | cpp -fopenmp -dM | grep -i open
#define _OPENMP 200805
Compiling gcc
Download gcc tarball, run contrib/download_prerequisites script to download external libraries to build as part of gcc.
./configure --prefix=/opt/gcc-custom --disable-multilib --disable-libada --enable-languages=c,c++
Static compilation
Insane Coding: Creating portable Linux binaries. Use -static-libgcc -static-libstdc++ to include compiler support libraries.
Linux distribution binary compatibility. Discusses glibc symbol versioning, and using the .symver directive to select a version of a functionl.
https://blogs.gnome.org/tvb/2013/12/14/application-bundles-revisited/ Application Bundles Revisited – Tristan's World. Discusses a vala script that will create a header file targeting an older glibc.
https://github.com/probonopd/AppImageKit/tree/fc6b9c5e896e4408ffd52a41dcb7a0be3149f74e/LibcWrapGenerator. Above script w/ CMake integration.
ABI
What gcc versions are available in Red Hat Enterprise Linux? - Red Hat Customer Portal: versions of GCC available on various RHEL/CentOS versions, including the Redhat Developer Toolset.
GCC 5.1 dual ABI w.r.t. std::string and std::list: https://gcc.gnu.org/onlinedocs/libstdc%2B%2B/manual/using_dual_abi.html
Interesting reading
Performance benchmarks w/ calling DSO libraries: compares DSOs w/ Position Independent Code (PIC) enabled, static libraries, and directly calling functions.
