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Prerequisites: `python3`; `gcc` and/or `clang`. Currently tested only
under Linux, but porting to other systems shouldn't be difficult.
### For sysadmins
To install in `/usr/local/{include,lib,bin,man}`:
./configure && make -j8 install
### For developers with an unprivileged account
Typically you'll already have
export LD_LIBRARY_PATH="$HOME/lib"
export LIBRARY_PATH="$HOME/lib"
export CPATH="$HOME/include"
export PATH="$HOME/bin:$PATH"
in `$HOME/.profile`. To install in `$HOME/{include,lib,bin,man}`:
./configure --prefix=$HOME && make -j8 install
### For distributors creating a package
Run
./configure --prefix=/usr && make -j8
and then follow your usual packaging procedures for the
`build/0/package` files:
build/0/package/man/man3/cpucycles.3
build/0/package/include/cpucycles.h
build/0/package/lib/libcpucycles*
build/0/package/bin/cpucycles-info
There are some old systems where libcpucycles requires `-lrt` for
`clock_gettime`; currently `libcpucycles.so` doesn't link to `-lrt`,
so it's up to the caller to link to `-lrt`.
### More options
You can run
./configure --host=amd64
to override `./configure`'s guess of the architecture that it should
compile for. The architecture controls which cycle counters to try
compiling: e.g., `amd64` tries compiling `cpucycles/amd64*` and
`cpucycles/default*`.
Inside the `build` directory, `0` is symlinked to `amd64` for
`--host=amd64`. Running `make clean` removes `build/amd64`. Re-running
`./configure` automatically starts with `make clean`.
A subsequent `./configure --host=arm64` will create `build/arm64` and
symlink `0 -> arm64`, without touching an existing `build/amd64`.
However, cross-compilers aren't yet selected automatically.
Compilers tried are listed in `compilers/default`. Each compiler
includes `-fPIC` to create a shared library, `-fvisibility=hidden` to
hide non-public symbols in the library, and `-fwrapv` to switch to a
slightly less dangerous version of C. The first compiler that seems to
work is used to compile everything.
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