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| author | dzaima <dzaimagit@gmail.com> | 2023-05-11 17:31:03 +0300 |
|---|---|---|
| committer | dzaima <dzaimagit@gmail.com> | 2023-05-11 17:32:09 +0300 |
| commit | ea4da381f2a3984ac8a2410ba4bcbc0ef339e7db (patch) | |
| tree | 2751a869a651f6f7fc8b584d79f4ea2d8b7a7253 /README.md | |
| parent | 33124067741e3379afd609e1d9960d432726df3b (diff) | |
CXXFLAGS, notes on cross-compilation
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 19 |
1 files changed, 14 insertions, 5 deletions
@@ -25,13 +25,14 @@ - Target architecture is decided from `uname` - override with `target_arch=...` (valid values being `x86-64`, `aarch64`, `generic`). For native builds, targeted extensions are decided by `/proc/cpuinfo` (or `sysctl machdep.cpu` on macOS), and C macro checks. - Build flags: - - `CC=cc` - choose a different C compiler (default is `clang`) - - `CXX=c++` - choose a different C++ compiler (default is `c++`) + - `CC=...` - choose a different C compiler (default is `clang`) + - `CXX=...` - choose a different C++ compiler (default is `c++`) - `f=...` - add extra C compiler flags for CBQN file compilation - - `lf=...` - add extra linker flags - - `CCFLAGS=...` - add flags for all CC/CXX/linker invocations - - `REPLXX=0`/`REPLXX=1` - enable/disable replxx (default depends on target and may change in the future) + - `lf=...` - add extra linking flags + - `CCFLAGS=...` - add flags for all CC/CXX/linking invocations + - `REPLXX=0`/`REPLXX=1` - enable/disable replxx (default depends on the target and may change in the future) - `REPLXX_FLAGS=...` - override replxx build flags (default is `-std=c++11 -Os`) + - `CXXFLAGS=...` - add additional CXX flags - `FFI=0` - disable libffi usage - `j=8` to override the default parallel job count - `OUTPUT=path/to/somewhere` - change output location; for `emcc-o3` it will be the destination folder of `BQN.js` and `BQN.wasm`, for everything else - the filename @@ -101,6 +102,14 @@ Git submodules are used for Singeli, replxx, and bytecode. Thus, CBQN won't buil Thus, you must either clone the repo (submodules will be automatically initialized/updated as needed), or use local copies of the submodules by linking/copying local versions to `build/singeliLocal`, `build/replxxLocal`, and `build/bytecodeLocal`. +### Cross-compilation + +You must manually set up a cross-compilation environment. It's possible to pass flags to all CC/CXX/linking invocations via `CCFLAGS=...`, and `LDFLAGS=...` to pass ones to the linking step specifically (more configuration options [above](#configuration-options)). + +A `target_arch=(x86-64|aarch64|generic)` make argument must be present (`generic` will work always, but a more specific argument will enable significant optimizations), as the default is to choose based on `uname`. + +Furthermore, most build targets will need a non-cross-compiled version of CBQN at build time to run Singeli and/or the build system. For those, a `make for-build` will need to be ran before the primary build, configured to not cross-compile. (this step only needs a C compiler (default is `CC=cc` here), and doesn't need libffi, nor a C++ compiler). + ## License Most files here are copyright (c) 2021-2023 dzaima & others, [GNU GPLv3 only](licenses/LICENSE-GPLv3). |