hare-build(1) General Commands Manual hare-build(1) NAME hare build - compile a Hare program or module SYNOPSIS hare build [-hFqv] [-a arch] [-D ident[:type]=value] [-j jobs] [-L libdir] [-l libname] [-N namespace] [-o path] [-R] [-T tagset] [-t type] [path] DESCRIPTION hare build compiles a Hare program or module. The path argument is a path to a Hare source file or to a directory which contains a Hare module (see hare-module(5)). If no path is given, the Hare module contained in the cur- rent working directory is built. OPTIONS -h Print the help text. -F Build for freestanding (non-hosted) environment. See FREESTANDING ENVI- RONMENT. -q Outside of errors, don't write anything to stdout while building. -v Enable verbose logging. Specify twice to increase verbosity. -a arch Set the desired architecture for cross-compiling. See ARCHITECTURES for supported architecture names. -D ident[:type]=value Define a constant in the type system. ident is parsed as a Hare identi- fier (e.g. "foo::bar::baz"), type as a Hare type (e.g. "str" or "struct { x: int, y: int }"), and value as a Hare expression (e.g. "42"). Take care to address any necessary escaping to avoid conflicts between your shell syntax and Hare syntax. -j jobs Set the maximum number of jobs to execute in parallel. The default is the number of processors available on the host. -L libdir Add a directory to the linker library search path. -l libname Link with the named system library. The name is passed directly to the linker. Linking with any library will also link with libc(7) and add the +libc tag to the default build tags (see BUILD TAGS in hare-mod- ule(5)). -N namespace Override the namespace for the module. -o path Set the output file to the given path. Setting the path to - causes output to be written to stdout. -R Build in release mode. In debug mode (the default), the debug:: module is imported as a dependency, which automatically installs a number of runtime debugging features in your executable. See this module's docu- mentation for details on these features. -T tagset Set or unset build tags. See BUILD TAGS in hare-module(5). -t type Set the build type. type should be one of s, o, or bin, for assembly, compiled object, or compiled binary, respectively. The default build type is compiled binary. ARCHITECTURES The -a flag is used for cross-compilation to a target architecture differ- ent from the host architecture. The following architectures are currently supported: * aarch64 * riscv64 * x86_64 The system usually provides reasonable defaults for the AR, AS, LD, and CC tools based on the desired target. However, you may wish to set these vari- ables yourself to control the cross toolchain in use. FREESTANDING ENVIRONMENT If run with -F, hare build will target a freestanding environment. This has the following effects: * No constraints are imposed on the signature of "main" * Specifying external libraries with -l will not automatically: * Link with libc (add -lc manually if required) * Add the +libc flag (add -T+libc manually if required) * Use the C compiler for linking (use LD=cc if required) ENVIRONMENT The following environment variables affect hare build's execution: HARECACHE The path to the build cache. Defaults to $XDG_CACHE_HOME/hare, or ~/.cache/hare if $XDG_CACHE_HOME isn't set. HAREPATH The list of directories to search for module dependencies in. See hare-module(5). NO_COLOR Disables all color output when set to a non-empty string. HAREC_COLOR Disables color output for harec when set to 0, enables it when set to any other value. This overrides NO_COLOR. HAREC Name of the harec command to use. HARECFLAGS Additional flags to pass to harec. QBE Name of the qbe command to use. QBEFLAGS Additional flags to pass to qbe. AR Name of the ar(1) command to use. ARFLAGS Additional flags to pass to ar(1). AS Name of the as(1) command to use. ASFLAGS Additional flags to pass to as(1). LD Name of the ld(1) command to use. LDLINKFLAGS Additional flags to pass to ld(1). CC Name of the cc(1) command to use when linking external li- braries. LDFLAGS Additional linker flags to pass to cc(1). SEE ALSO hare-run(1), hare-test(1), hare-module(5), ar(1), as(1), cc(1), ld(1) 2026-08-27 hare-build(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ARCHITECTURES | FREESTANDING ENVIRONMENT | ENVIRONMENT | SEE ALSO
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