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diff --git a/contrib/llvm-project/lld/tools/lld/lld.cpp b/contrib/llvm-project/lld/tools/lld/lld.cpp
--- a/contrib/llvm-project/lld/tools/lld/lld.cpp
+++ b/contrib/llvm-project/lld/tools/lld/lld.cpp
@@ -146,7 +146,8 @@
static int lldMain(int argc, const char **argv, llvm::raw_ostream &stdoutOS,
llvm::raw_ostream &stderrOS, bool exitEarly = true) {
std::vector<const char *> args(argv, argv + argc);
-#ifdef __FreeBSD__
+#if 1
+ /* On FreeBSD we only build the ELF linker. */
return !elf::link(args, exitEarly, stdoutOS, stderrOS);
#else
switch (parseFlavor(args)) {
diff --git a/lib/clang/include/llvm/Config/config.h b/lib/clang/include/llvm/Config/config.h
--- a/lib/clang/include/llvm/Config/config.h
+++ b/lib/clang/include/llvm/Config/config.h
@@ -29,7 +29,11 @@
/* #undef HAVE_CRASHREPORTERCLIENT_H */
/* can use __crashreporter_info__ */
+#if defined(__APPLE__)
+#define HAVE_CRASHREPORTER_INFO 1
+#else
#define HAVE_CRASHREPORTER_INFO 0
+#endif
/* Define to 1 if you have the declaration of `arc4random', and to 0 if you
don't. */
@@ -125,28 +129,46 @@
#define HAVE_PTHREAD_SETNAME_NP 1
/* Define to 1 if you have the <link.h> header file. */
+#if __has_include(<link.h>)
#define HAVE_LINK_H 1
+#else
+#define HAVE_LINK_H 0
+#endif
/* Define to 1 if you have the `lseek64' function. */
-/* #undef HAVE_LSEEK64 */
+#if defined(__linux__)
+#define HAVE_LSEEK64 1
+#endif
/* Define to 1 if you have the <mach/mach.h> header file. */
-/* #undef HAVE_MACH_MACH_H */
+#if __has_include(<mach/mach.h>)
+#define HAVE_MACH_MACH_H 1
+#endif
/* Define to 1 if you have the `mallctl' function. */
+#if defined(__FreeBSD__)
#define HAVE_MALLCTL 1
+#endif
/* Define to 1 if you have the `mallinfo' function. */
-/* #undef HAVE_MALLINFO */
+#if defined(__linux__)
+#define HAVE_MALLINFO 1
+#endif
/* Define to 1 if you have the <malloc/malloc.h> header file. */
-/* #undef HAVE_MALLOC_MALLOC_H */
+#if __has_include(<malloc/malloc.h>)
+#define HAVE_MALLOC_MALLOC_H 1
+#endif
/* Define to 1 if you have the `malloc_zone_statistics' function. */
-/* #undef HAVE_MALLOC_ZONE_STATISTICS */
+#if defined(__APPLE__)
+#define HAVE_MALLOC_ZONE_STATISTICS 1
+#endif
/* Define to 1 if you have the `posix_fallocate' function. */
+#if !defined(__APPLE__)
#define HAVE_POSIX_FALLOCATE 1
+#endif
/* Define to 1 if you have the `posix_spawn' function. */
#define HAVE_POSIX_SPAWN 1
@@ -209,19 +231,31 @@
#define HAVE_SYS_TIME_H 1
/* Define to 1 if stat struct has st_mtimespec member .*/
+#if !defined(__linux__)
#define HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC 1
+#endif
/* Define to 1 if stat struct has st_mtim member. */
+#if !defined(__APPLE__)
#define HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC 1
+#endif
/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1
/* Define if the setupterm() function is supported this platform. */
+#if defined(__FreeBSD__)
+/*
+ * This is only needed for terminalHasColors(). When disabled LLVM falls back
+ * to checking a list of TERM prefixes which is sufficient for a bootstrap tool.
+ */
#define LLVM_ENABLE_TERMINFO 1
+#endif
/* Define if the xar_open() function is supported this platform. */
-/* #undef HAVE_LIBXAR */
+#if defined(__APPLE__)
+#define HAVE_LIBXAR
+#endif
/* Define to 1 if you have the <termios.h> header file. */
#define HAVE_TERMIOS_H 1
@@ -239,7 +273,9 @@
/* #undef HAVE__CHSIZE_S */
/* Define to 1 if you have the `_Unwind_Backtrace' function. */
-/* #undef HAVE__UNWIND_BACKTRACE */
+#if !defined(__FreeBSD__)
+#define HAVE__UNWIND_BACKTRACE 1
+#endif
/* Have host's __alloca */
/* #undef HAVE___ALLOCA */
@@ -315,7 +351,11 @@
/* #undef LLVM_LIBXML2_ENABLED */
/* Define to the extension used for shared libraries, say, ".so". */
+#if defined(__APPLE__)
+#define LTDL_SHLIB_EXT ".dylib"
+#else
#define LTDL_SHLIB_EXT ".so"
+#endif
/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT "https://bugs.freebsd.org/submit/"
@@ -351,6 +391,10 @@
/* #undef LLVM_GISEL_COV_PREFIX */
/* Whether Timers signpost passes in Xcode Instruments */
+#if defined(__APPLE__)
+#define LLVM_SUPPORT_XCODE_SIGNPOSTS 1
+#else
#define LLVM_SUPPORT_XCODE_SIGNPOSTS 0
+#endif
#endif
diff --git a/lib/clang/libllvm/Makefile b/lib/clang/libllvm/Makefile
--- a/lib/clang/libllvm/Makefile
+++ b/lib/clang/libllvm/Makefile
@@ -717,7 +717,8 @@
SRCS_EXL+= LTO/SummaryBasedOptimizations.cpp
SRCS_EXL+= LTO/ThinLTOCodeGenerator.cpp
SRCS_MIN+= LTO/UpdateCompilerUsed.cpp
-SRCS_MIN+= LineEditor/LineEditor.cpp
+# Only needed for clangd/clang-query, uncomment once we build those.
+# SRCS_XDW+= LineEditor/LineEditor.cpp
SRCS_MIN+= Linker/IRMover.cpp
SRCS_MIN+= Linker/LinkModules.cpp
SRCS_MIN+= MC/ConstantPools.cpp
diff --git a/lib/clang/llvm.build.mk b/lib/clang/llvm.build.mk
--- a/lib/clang/llvm.build.mk
+++ b/lib/clang/llvm.build.mk
@@ -100,12 +100,24 @@
CFLAGS+= -ffunction-sections
CFLAGS+= -fdata-sections
+.if ${LINKER_TYPE} == "mac"
+LDFLAGS+= -Wl,-dead_strip
+.else
LDFLAGS+= -Wl,--gc-sections
+.endif
CXXSTD?= c++14
CXXFLAGS+= -fno-exceptions
CXXFLAGS+= -fno-rtti
+.if ${.MAKE.OS} == "FreeBSD" || !defined(BOOTSTRAPPING)
+# Building on macOS/Linux needs the real sysctl() not the bootstrap tools stub.
+CFLAGS+= -DBOOTSTRAPPING_WANT_NATIVE_SYSCTL
+.else
CXXFLAGS.clang+= -stdlib=libc++
+.endif
+.if defined(BOOTSTRAPPING) && ${.MAKE.OS} == "Linux"
+LIBADD+= dl
+.endif
.if ${MACHINE_ARCH:Mmips64}
STATIC_CFLAGS+= -mxgot
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -360,14 +360,6 @@
__DEFAULT_NO_OPTIONS+=OPENMP
.endif
-.if ${.MAKE.OS} != "FreeBSD"
-# Building the target compiler requires building tablegen on the host
-# which is (currently) not possible on non-FreeBSD.
-BROKEN_OPTIONS+=CLANG LLD LLDB
-# The same also applies to the bootstrap LLVM.
-BROKEN_OPTIONS+=CLANG_BOOTSTRAP LLD_BOOTSTRAP
-.endif
-
.include <bsd.mkopt.mk>
#
diff --git a/tools/build/cross-build/include/common/sys/sysctl.h b/tools/build/cross-build/include/common/sys/sysctl.h
--- a/tools/build/cross-build/include/common/sys/sysctl.h
+++ b/tools/build/cross-build/include/common/sys/sysctl.h
@@ -37,6 +37,11 @@
*/
#pragma once
+#ifdef BOOTSTRAPPING_WANT_NATIVE_SYSCTL
+/* We need the real sysctl.h e.g. when bootstrapping the LLVM tools. */
+#include_next <sys/sysctl.h>
+#else
+/* Otherwise, avoid sysctls since they might not be supported on the host. */
#include <sys/types.h>
#define sysctlbyname __freebsd_sysctlbyname
@@ -44,3 +49,4 @@
int sysctl(const int *, u_int, void *, size_t *, const void *, size_t);
int sysctlbyname(const char *, void *, size_t *, const void *, size_t);
+#endif
diff --git a/tools/build/make.py b/tools/build/make.py
--- a/tools/build/make.py
+++ b/tools/build/make.py
@@ -166,6 +166,9 @@
"needed if CC/CPP/CXX are not set). ")
parser.add_argument("--debug", action="store_true",
help="Print information on inferred env vars")
+ parser.add_argument("--bootstrap-toolchain", action="store_true",
+ help="Bootstrap the toolchain instead of using an "
+ "external one (experimental and not recommended)")
parser.add_argument("--clean", action="store_true",
help="Do a clean rebuild instead of building with "
"-DWITHOUT_CLEAN")
@@ -195,6 +198,7 @@
if "universe" not in sys.argv and "tinderbox" not in sys.argv:
sys.exit("TARGET= and TARGET_ARCH= must be set explicitly "
"when building on non-FreeBSD")
+ if not parsed_args.bootstrap_toolchain:
# infer values for CC/CXX/CPP
if parsed_args.host_compiler_type == "gcc":
default_cc, default_cxx, default_cpp = ("gcc", "g++", "cpp")
diff --git a/usr.bin/clang/clang.prog.mk b/usr.bin/clang/clang.prog.mk
--- a/usr.bin/clang/clang.prog.mk
+++ b/usr.bin/clang/clang.prog.mk
@@ -17,8 +17,10 @@
PACKAGE= clang
+.if ${.MAKE.OS} == "FreeBSD" || !defined(BOOTSTRAPPING)
LIBADD+= execinfo
LIBADD+= ncursesw
+.endif
LIBADD+= pthread
.include <bsd.prog.mk>
diff --git a/usr.bin/clang/lld/Makefile b/usr.bin/clang/lld/Makefile
--- a/usr.bin/clang/lld/Makefile
+++ b/usr.bin/clang/lld/Makefile
@@ -102,8 +102,10 @@
DPSRCS+= ${TGHDRS}
CLEANFILES+= ${TGHDRS} ${TGHDRS:C/$/.d/}
+.if ${.MAKE.OS} == "FreeBSD" || !defined(BOOTSTRAPPING)
LIBADD+= execinfo
LIBADD+= ncursesw
+.endif
LIBADD+= pthread
LIBADD+= z
diff --git a/usr.bin/clang/llvm.prog.mk b/usr.bin/clang/llvm.prog.mk
--- a/usr.bin/clang/llvm.prog.mk
+++ b/usr.bin/clang/llvm.prog.mk
@@ -22,8 +22,10 @@
PACKAGE= clang
+.if ${.MAKE.OS} == "FreeBSD" || !defined(BOOTSTRAPPING)
LIBADD+= execinfo
LIBADD+= ncursesw
+.endif
LIBADD+= pthread
.include <bsd.prog.mk>

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