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Rely on an external package for portability questions about the libc #8

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d7d08d1
Use an external source of truth for listing functions and headers of …
agagniere Jun 8, 2026
877971c
Also test libc types and constants
agagniere Jun 8, 2026
bbadc1b
Use libcquery for more functions
agagniere Jun 8, 2026
8e1b725
use libcquery for the remaining functions, headers and types
agagniere Jun 8, 2026
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268 changes: 107 additions & 161 deletions build.zig
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
const std = @import("std");
const libcquery = @import("libcquery");

const version = std.SemanticVersion.parse(@import("build.zig.zon").version) catch unreachable;

Expand Down Expand Up @@ -614,6 +615,11 @@ pub fn build(b: *std.Build) !void {
}
}

const lc_features = libcquery.libc_features.detect(target.result);
const lc_headers = libcquery.libc_headers.detect(target.result);
const lc_constants = libcquery.libc_constants.detect(target.result);
const lc_types = libcquery.libc_types.detect(target.result);

const curl_config = b.addConfigHeader(.{
.style = .{ .cmake = upstream.path("lib/curl_config-cmake.h.in") },
.include_path = "curl_config.h",
Expand Down Expand Up @@ -671,212 +677,152 @@ pub fn build(b: *std.Build) !void {
.USE_WIN32_CRYPTO = target.result.os.tag == .windows, // Assumes 'NOT WINDOWS_STORE'
.USE_WIN32_LDAP = target.result.os.tag == .windows and use_win32_ldap and !disable_ldap, // Assumes 'NOT WINDOWS_STORE'
.USE_IPV6 = enable_ipv6,
.HAVE_ALARM = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_ARC4RANDOM = switch (target.result.os.tag) {
.dragonfly,
.netbsd,
.freebsd,
.openbsd,
.macos,
.ios,
.tvos,
.watchos,
.visionos,
.wasi,
=> true,
else => false,
},
.HAVE_ARPA_INET_H = target.result.os.tag != .windows,
.HAVE_ALARM = lc_features.alarm,
.HAVE_ARC4RANDOM = lc_features.arc4random,
.HAVE_ARPA_INET_H = lc_headers.arpa_inet_h,
.HAVE_ATOMIC = true,
.HAVE_ACCEPT4 = switch (target.result.os.tag) {
.linux => true,
.freebsd => target.result.os.isAtLeast(.freebsd, .{ .major = 10, .minor = 0, .patch = 0 }) orelse false,
.dragonfly => target.result.os.isAtLeast(.dragonfly, .{ .major = 4, .minor = 3, .patch = 0 }) orelse false,
.netbsd => target.result.os.isAtLeast(.netbsd, .{ .major = 8, .minor = 0, .patch = 0 }) orelse false,
.openbsd => false,
else => false,
},
.HAVE_FNMATCH = target.result.os.tag != .windows,
.HAVE_ACCEPT4 = lc_features.accept4,
.HAVE_FNMATCH = lc_features.fnmatch,
.HAVE_BASENAME = true,
.HAVE_BOOL_T = true,
.HAVE_BUILTIN_AVAILABLE = target.result.os.tag.isDarwin(),
.HAVE_CLOCK_GETTIME_MONOTONIC = target.result.os.tag != .windows,
.HAVE_CLOCK_GETTIME_MONOTONIC_RAW = target.result.os.tag == .linux or target.result.os.tag.isDarwin(),
.HAVE_CLOCK_GETTIME_MONOTONIC = lc_features.clock_gettime and lc_constants.clock_monotonic,
.HAVE_CLOCK_GETTIME_MONOTONIC_RAW = lc_constants.clock_monotonic_raw,
.HAVE_CLOSESOCKET = target.result.os.tag == .windows,
.HAVE_CLOSESOCKET_CAMEL = null,
.HAVE_DIRENT_H = true,
.HAVE_OPENDIR = true,
.HAVE_FCNTL = target.result.os.tag != .windows,
.HAVE_FCNTL_H = true,
.HAVE_FCNTL_O_NONBLOCK = target.result.os.tag != .windows,
.HAVE_FREEADDRINFO = target.result.os.tag != .wasi,
.HAVE_FSEEKO = target.result.os.tag != .windows,
.HAVE_DECL_FSEEKO = target.result.os.tag != .windows,
.HAVE_FTRUNCATE = true,
.HAVE_GETADDRINFO = target.result.os.tag != .wasi,
.HAVE_GETADDRINFO_THREADSAFE = target.result.os.tag != .wasi and target.result.os.tag != .openbsd,
.HAVE_GETEUID = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETPPID = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETHOSTBYNAME_R = switch (target.result.os.tag) {
.linux => true,
.windows, .wasi => false,
.freebsd => target.result.os.isAtLeast(.freebsd, .{ .major = 6, .minor = 2, .patch = 0 }) orelse false,
.dragonfly => target.result.os.isAtLeast(.dragonfly, .{ .major = 2, .minor = 1, .patch = 0 }) orelse false,
else => false,
},
.HAVE_DIRENT_H = lc_headers.dirent_h,
.HAVE_OPENDIR = lc_features.opendir,
.HAVE_FCNTL = lc_features.fcntl,
.HAVE_FCNTL_H = lc_headers.fcntl_h,
.HAVE_FCNTL_O_NONBLOCK = lc_constants.o_nonblock,
.HAVE_FREEADDRINFO = lc_features.freeaddrinfo,
.HAVE_FSEEKO = lc_features.fseeko,
.HAVE_DECL_FSEEKO = lc_features.fseeko,
.HAVE_FTRUNCATE = lc_features.ftruncate,
.HAVE_GETADDRINFO = lc_features.getaddrinfo,
.HAVE_GETADDRINFO_THREADSAFE = lc_features.getaddrinfo_threadsafe,
.HAVE_GETEUID = lc_features.geteuid,
.HAVE_GETPPID = lc_features.getppid,
.HAVE_GETHOSTBYNAME_R = lc_features.gethostbyname_r,
.HAVE_GETHOSTBYNAME_R_3 = null,
.HAVE_GETHOSTBYNAME_R_5 = null,
.HAVE_GETHOSTBYNAME_R_6 = switch (target.result.os.tag) {
.linux => true,
.windows, .wasi => false,
.freebsd => target.result.os.isAtLeast(.freebsd, .{ .major = 6, .minor = 2, .patch = 0 }) orelse false,
.dragonfly => target.result.os.isAtLeast(.dragonfly, .{ .major = 2, .minor = 1, .patch = 0 }) orelse false,
else => false,
},
.HAVE_GETHOSTNAME = target.result.os.tag != .wasi,
.HAVE_GETIFADDRS = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETPASS_R = target.result.os.isAtLeast(.netbsd, .{ .major = 7, .minor = 0, .patch = 0 }) orelse false,
.HAVE_GETPEERNAME = target.result.os.tag != .wasi,
.HAVE_GETSOCKNAME = target.result.os.tag != .wasi,
.HAVE_IF_NAMETOINDEX = target.result.os.tag != .wasi,
.HAVE_GETPWUID = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETPWUID_R = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETRLIMIT = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_GETTIMEOFDAY = true,
.HAVE_GETHOSTBYNAME_R_6 = lc_features.gethostbyname_r,
.HAVE_GETHOSTNAME = lc_features.gethostname,
.HAVE_GETIFADDRS = lc_features.getifaddrs,
.HAVE_GETPASS_R = lc_features.getpass_r,
.HAVE_GETPEERNAME = lc_features.getpeername,
.HAVE_GETSOCKNAME = lc_features.getsockname,
.HAVE_IF_NAMETOINDEX = lc_features.if_nametoindex,
.HAVE_GETPWUID = lc_features.getpwuid,
.HAVE_GETPWUID_R = lc_features.getpwuid_r,
.HAVE_GETRLIMIT = lc_features.getrlimit,
.HAVE_GETTIMEOFDAY = lc_features.gettimeofday,
.HAVE_GLIBC_STRERROR_R = false, // TODO why not target.result.isGnuLibC()?
.HAVE_GMTIME_R = target.result.os.tag != .windows,
.HAVE_GMTIME_R = lc_features.gmtime_r,
.HAVE_GSSAPI = null,
.HAVE_GSSGNU = null,
.CURL_KRB5_VERSION = null,
.HAVE_IFADDRS_H = target.result.os.tag != .windows,
.HAVE_INET_NTOP = target.result.os.tag != .windows,
.HAVE_INET_PTON = target.result.os.tag != .windows,
.HAVE_SA_FAMILY_T = target.result.os.tag != .windows,
.HAVE_IFADDRS_H = lc_headers.ifaddrs_h,
.HAVE_INET_NTOP = lc_features.inet_ntop,
.HAVE_INET_PTON = lc_features.inet_pton,
.HAVE_SA_FAMILY_T = lc_types.sa_family_t,
.HAVE_ADDRESS_FAMILY = target.result.os.tag == .windows,
.HAVE_IOCTLSOCKET = target.result.os.tag == .windows,
.HAVE_IOCTLSOCKET_CAMEL = null,
.HAVE_IOCTLSOCKET_CAMEL_FIONBIO = null,
.HAVE_IOCTLSOCKET_FIONBIO = target.result.os.tag == .windows,
.HAVE_IOCTL_FIONBIO = target.result.os.tag != .windows,
.HAVE_IOCTL_SIOCGIFADDR = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_IO_H = target.result.os.tag == .windows,
.HAVE_IO_H = lc_headers.io_h,
.HAVE_LBER_H = have_lber_h,
.HAVE_LDAP_SSL = have_ldap_ssl,
.HAVE_LDAP_SSL_H = null,
.HAVE_LDAP_URL_PARSE = null,
.HAVE_LIBGEN_H = true,
.HAVE_LIBGEN_H = lc_headers.libgen_h,
.HAVE_LIBIDN2 = use_libidn2 and !use_apple_idn and !use_win32_idn,
.HAVE_IDN2_H = use_libidn2 and !use_apple_idn and !use_win32_idn,
.HAVE_LIBZ = use_zlib,
.HAVE_BROTLI = use_brotli,
.HAVE_ZSTD = use_zstd,
.HAVE_LOCALE_H = true,
.HAVE_LOCALTIME_R = target.result.os.tag != .windows,
.HAVE_LOCALE_H = lc_headers.locale_h,
.HAVE_LOCALTIME_R = lc_features.localtime_r,
.HAVE_LONGLONG = true,
.HAVE_SUSECONDS_T = target.result.os.tag != .windows,
.HAVE_MSG_NOSIGNAL = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_NETDB_H = target.result.os.tag != .windows,
.HAVE_NETINET_IN_H = target.result.os.tag != .windows,
.HAVE_SUSECONDS_T = lc_types.suseconds_t,
.HAVE_MSG_NOSIGNAL = lc_constants.msg_nosignal,
.HAVE_NETDB_H = lc_headers.netdb_h,
.HAVE_NETINET_IN_H = lc_headers.netinet_in_h,
.HAVE_NETINET_IN6_H = null,
.HAVE_NETINET_TCP_H = target.result.os.tag != .windows,
.HAVE_NETINET_UDP_H = target.result.os.tag != .windows,
.HAVE_LINUX_TCP_H = target.result.os.tag == .linux,
.HAVE_NET_IF_H = target.result.os.tag != .windows,
.HAVE_NETINET_TCP_H = lc_headers.netinet_tcp_h,
.HAVE_NETINET_UDP_H = lc_headers.netinet_udp_h,
.HAVE_LINUX_TCP_H = lc_headers.linux_tcp_h,
.HAVE_NET_IF_H = lc_headers.net_if_h,
.HAVE_OLD_GSSMIT = null,
.HAVE_PIPE = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_PIPE2 = switch (target.result.os.tag) {
.linux => true,
.dragonfly, .freebsd, .netbsd, .openbsd => true,
else => false,
},
.HAVE_EVENTFD = switch (target.result.os.tag) {
.windows, .wasi => false,
.linux => if (target.result.isMuslLibC())
true
else
target.result.os.isAtLeast(.linux, .{ .major = 2, .minor = 8, .patch = 0 }),
.freebsd => target.result.os.isAtLeast(.freebsd, .{ .major = 13, .minor = 0, .patch = 0 }) orelse false,
.netbsd => target.result.os.isAtLeast(.netbsd, .{ .major = 10, .minor = 0, .patch = 0 }) orelse false,
else => !target.result.os.tag.isDarwin(),
},
.HAVE_POLL = target.result.os.tag != .windows,
.HAVE_POLL_H = target.result.os.tag != .windows,
.HAVE_PIPE = lc_features.pipe,
.HAVE_PIPE2 = lc_features.pipe2,
.HAVE_EVENTFD = lc_features.eventfd,
.HAVE_POLL = lc_features.poll,
.HAVE_POLL_H = lc_headers.poll_h,
.HAVE_POSIX_STRERROR_R = switch (target.result.os.tag) {
.windows => false,
.linux => true, // TODO why not target.result.isMuslLibC()?
else => true,
},
.HAVE_PWD_H = target.result.os.tag != .windows,
.HAVE_PWD_H = lc_headers.pwd_h,
.HAVE_SSL_SET0_WBIO = null, // TODO
.HAVE_RECV = true,
.HAVE_SELECT = true,
.HAVE_SCHED_YIELD = target.result.os.tag != .windows,
.HAVE_SEND = true,
.HAVE_SENDMSG = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_SENDMMSG = switch (target.result.os.tag) {
.windows, .wasi => false,
.linux => if (target.result.isMuslLibC())
true
else
target.result.os.isAtLeast(.linux, .{ .major = 2, .minor = 14, .patch = 0 }),
else => !target.result.os.tag.isDarwin(),
},
.HAVE_FSETXATTR = switch (target.result.os.tag) {
.linux => true,
.netbsd => true,
else => false,
},
.HAVE_FSETXATTR_5 = switch (target.result.os.tag) {
.linux => true,
.netbsd => true,
else => false,
},
.HAVE_FSETXATTR_6 = null,
.HAVE_SETLOCALE = true,
.HAVE_SETMODE = target.result.os.tag == .windows or target.result.os.tag.isBSD(),
.HAVE_RECV = lc_features.recv,
.HAVE_SELECT = lc_features.select,
.HAVE_SCHED_YIELD = lc_features.sched_yield,
.HAVE_SEND = lc_features.send,
.HAVE_SENDMSG = lc_features.sendmsg,
.HAVE_SENDMMSG = lc_features.sendmmsg,
.HAVE_FSETXATTR = lc_features.fsetxattr,
.HAVE_FSETXATTR_5 = lc_features.fsetxattr and !target.result.os.tag.isDarwin(),
.HAVE_FSETXATTR_6 = lc_features.fsetxattr and target.result.os.tag.isDarwin(),
.HAVE_SETLOCALE = lc_features.setlocale,
.HAVE_SETMODE = lc_features.setmode,
.HAVE__SETMODE = target.result.os.tag == .windows,
.HAVE_SETRLIMIT = target.result.os.tag != .wasi,
.HAVE_SETRLIMIT = lc_features.setrlimit,
.HAVE_SETSOCKOPT_SO_NONBLOCK = null,
.HAVE_SIGACTION = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_SIGINTERRUPT = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_SIGNAL = target.result.os.tag != .wasi,
.HAVE_SIGSETJMP = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_SNPRINTF = true,
.HAVE_SIGACTION = lc_features.sigaction,
.HAVE_SIGINTERRUPT = lc_features.siginterrupt,
.HAVE_SIGNAL = lc_features.signal,
.HAVE_SIGSETJMP = lc_features.sigsetjmp,
.HAVE_SNPRINTF = lc_features.snprintf,
.HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID = target.result.os.tag == .windows, // TODO
.HAVE_SOCKET = target.result.os.tag != .wasi,
.HAVE_SOCKET = lc_features.socket,
.HAVE_PROTO_BSDSOCKET_H = null,
.HAVE_SOCKETPAIR = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_STDATOMIC_H = true,
.HAVE_STDBOOL_H = true,
.HAVE_STDINT_H = true,
.HAVE_STRCASECMP = target.result.os.tag != .windows,
.HAVE_SOCKETPAIR = lc_features.socketpair,
.HAVE_STDATOMIC_H = lc_headers.stdatomic_h,
.HAVE_STDBOOL_H = lc_headers.stdbool_h,
.HAVE_STDINT_H = lc_headers.stdint_h,
.HAVE_STRCASECMP = lc_features.strcasecmp,
.HAVE_STRCMPI = null,
.HAVE_STRDUP = true,
.HAVE_STRERROR_R = target.result.os.tag != .windows,
.HAVE_STRDUP = lc_features.strdup,
.HAVE_STRERROR_R = lc_features.strerror_r,
.HAVE_STRICMP = null,
.HAVE_STRINGS_H = true,
.HAVE_STROPTS_H = target.result.isMuslLibC(),
.HAVE_MEMRCHR = target.result.os.tag != .windows and !target.result.os.tag.isDarwin() and target.result.os.tag != .wasi,
.HAVE_STRUCT_SOCKADDR_STORAGE = true,
.HAVE_STRUCT_TIMEVAL = true,
.HAVE_SYS_EVENTFD_H = target.result.os.tag != .windows and !target.result.os.tag.isDarwin() and target.result.os.tag != .openbsd,
.HAVE_SYS_FILIO_H = target.result.os.tag.isBSD(),
.HAVE_SYS_IOCTL_H = target.result.os.tag != .windows,
.HAVE_SYS_PARAM_H = true,
.HAVE_SYS_POLL_H = target.result.os.tag != .windows,
.HAVE_SYS_RESOURCE_H = target.result.os.tag != .windows and target.result.os.tag != .wasi,
.HAVE_SYS_SELECT_H = target.result.os.tag != .windows,
.HAVE_SYS_SOCKIO_H = target.result.os.tag.isBSD(),
.HAVE_SYS_STAT_H = true,
.HAVE_SYS_TYPES_H = true,
.HAVE_SYS_UN_H = target.result.os.tag != .windows,
.HAVE_SYS_UTIME_H = target.result.os.tag == .windows,
.HAVE_TERMIOS_H = target.result.os.tag != .windows,
.HAVE_STRINGS_H = lc_headers.strings_h,
.HAVE_STROPTS_H = lc_headers.stropts_h,
.HAVE_MEMRCHR = lc_features.memrchr,
.HAVE_STRUCT_SOCKADDR_STORAGE = lc_types.struct_sockaddr_storage,
.HAVE_STRUCT_TIMEVAL = lc_types.struct_timeval,
.HAVE_SYS_EVENTFD_H = lc_headers.sys_eventfd_h,
.HAVE_SYS_FILIO_H = lc_headers.sys_filio_h,
.HAVE_SYS_IOCTL_H = lc_headers.sys_ioctl_h,
.HAVE_SYS_PARAM_H = lc_headers.sys_param_h,
.HAVE_SYS_POLL_H = lc_headers.poll_h,
.HAVE_SYS_RESOURCE_H = lc_headers.sys_resource_h,
.HAVE_SYS_SELECT_H = lc_headers.sys_select_h,
.HAVE_SYS_SOCKIO_H = lc_headers.sys_sockio_h,
.HAVE_SYS_STAT_H = lc_headers.sys_stat_h,
.HAVE_SYS_TYPES_H = lc_headers.sys_types_h,
.HAVE_SYS_UN_H = lc_headers.sys_un_h,
.HAVE_SYS_UTIME_H = lc_headers.sys_utime_h,
.HAVE_TERMIOS_H = lc_headers.termios_h,
.HAVE_TERMIO_H = null,
.HAVE_UNISTD_H = true,
.HAVE_UNISTD_H = lc_headers.unistd_h,
.HAVE_UTIME = true,
.HAVE_UTIMES = target.result.os.tag != .windows,
.HAVE_UTIME_H = true,
.HAVE_UTIMES = lc_features.utimes,
.HAVE_UTIME_H = lc_headers.utime_h,
.HAVE_WRITABLE_ARGV = target.result.os.tag.isDarwin(),
.HAVE_TIME_T_UNSIGNED = null,
.NEED_REENTRANT = null,
Expand Down
4 changes: 4 additions & 0 deletions build.zig.zon
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,10 @@
.hash = "mbedtls-3.6.4-E4NUR2wWAAAUSvVbho9aaU31-e4D8glu9l1VfxKezBkV",
.lazy = true,
},
.libcquery = .{
.url = "git+https://github.com/agagniere/libc-query#b441e4923bb7d39018e9f5aaaf9ed0189349e173",
.hash = "libcquery-0.1.1-_2254XxFAQB6zE9xGH9hJSglKeE80Yq1fgsaNiokLP2v",
},
},
.paths = .{
"build.zig",
Expand Down
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