diff --git a/lib/clang/Makefile.inc b/lib/clang/Makefile.inc
--- a/lib/clang/Makefile.inc
+++ b/lib/clang/Makefile.inc
@@ -1,13 +1,15 @@
 
-.include <bsd.compiler.mk>
+.include <src.opts.mk>
 
 PACKAGE=	clang
 MK_PIE:=	no	# Explicit libXXX.a references
 
+.if ${MK_LLVM_FULL_DEBUGINFO} == "no"
 .if ${COMPILER_TYPE} == "clang"
 DEBUG_FILES_CFLAGS= -gline-tables-only
 .else
 DEBUG_FILES_CFLAGS= -g1
 .endif
+.endif
 
 WARNS?=		0
diff --git a/lib/clang/headers/Makefile b/lib/clang/headers/Makefile
--- a/lib/clang/headers/Makefile
+++ b/lib/clang/headers/Makefile
@@ -1,4 +1,5 @@
 
+.include <bsd.init.mk>
 .include "../clang.pre.mk"
 
 .PATH:		${CLANG_SRCS}/lib/Headers
diff --git a/lib/clang/libclang/Makefile b/lib/clang/libclang/Makefile
--- a/lib/clang/libclang/Makefile
+++ b/lib/clang/libclang/Makefile
@@ -1,5 +1,5 @@
 
-.include <src.opts.mk>
+.include <bsd.init.mk>
 .include "../clang.pre.mk"
 
 LIB=		clang
diff --git a/lib/clang/libclangminimal/Makefile b/lib/clang/libclangminimal/Makefile
--- a/lib/clang/libclangminimal/Makefile
+++ b/lib/clang/libclangminimal/Makefile
@@ -1,4 +1,5 @@
 
+.include <bsd.init.mk>
 .include "../clang.pre.mk"
 
 LIB=		clangminimal
diff --git a/lib/clang/liblldb/Makefile b/lib/clang/liblldb/Makefile
--- a/lib/clang/liblldb/Makefile
+++ b/lib/clang/liblldb/Makefile
@@ -1,4 +1,5 @@
 
+.include <bsd.init.mk>
 .include "../lldb.pre.mk"
 
 LIB=		lldb
diff --git a/lib/clang/libllvm/Makefile b/lib/clang/libllvm/Makefile
--- a/lib/clang/libllvm/Makefile
+++ b/lib/clang/libllvm/Makefile
@@ -1,5 +1,5 @@
 
-.include <src.opts.mk>
+.include <bsd.init.mk>
 .include "../llvm.pre.mk"
 
 LIB=		llvm
diff --git a/lib/clang/libllvmminimal/Makefile b/lib/clang/libllvmminimal/Makefile
--- a/lib/clang/libllvmminimal/Makefile
+++ b/lib/clang/libllvmminimal/Makefile
@@ -1,4 +1,5 @@
 
+.include <bsd.init.mk>
 .include "../llvm.pre.mk"
 
 LIB=		llvmminimal
diff --git a/share/man/man5/src.conf.5 b/share/man/man5/src.conf.5
--- a/share/man/man5/src.conf.5
+++ b/share/man/man5/src.conf.5
@@ -1,5 +1,5 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
-.Dd November 13, 2023
+.Dd February 16, 2024
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -929,6 +929,9 @@
 tool.
 .It Va WITHOUT_LLVM_CXXFILT
 Install ELF Tool Chain's cxxfilt as c++filt, instead of LLVM's llvm-cxxfilt.
+.It Va WITH_LLVM_FULL_DEBUGINFO
+Generate full debug information for LLVM libraries and tools, which uses
+more disk space and build resources, but allows for easier debugging.
 .It Va WITHOUT_LLVM_TARGET_AARCH64
 Do not build LLVM target support for AArch64.
 The
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
@@ -205,6 +205,7 @@
     LOADER_VERBOSE \
     LOADER_VERIEXEC_PASS_MANIFEST \
     LLVM_BINUTILS \
+    LLVM_FULL_DEBUGINFO \
     MALLOC_PRODUCTION \
     OFED_EXTRA \
     OPENLDAP \
diff --git a/tools/build/options/WITH_LLVM_FULL_DEBUGINFO b/tools/build/options/WITH_LLVM_FULL_DEBUGINFO
new file mode 100644
--- /dev/null
+++ b/tools/build/options/WITH_LLVM_FULL_DEBUGINFO
@@ -0,0 +1,2 @@
+Generate full debug information for LLVM libraries and tools, which uses
+more disk space and build resources, but allows for easier debugging.
diff --git a/usr.bin/clang/Makefile.inc b/usr.bin/clang/Makefile.inc
--- a/usr.bin/clang/Makefile.inc
+++ b/usr.bin/clang/Makefile.inc
@@ -1,14 +1,16 @@
 
-WARNS?=		0
-
-.include <bsd.compiler.mk>
+.include <src.opts.mk>
 
 MK_PIE:=	no	# Explicit libXXX.a references
 
+.if ${MK_LLVM_FULL_DEBUGINFO} == "no"
 .if ${COMPILER_TYPE} == "clang"
 DEBUG_FILES_CFLAGS= -gline-tables-only
 .else
 DEBUG_FILES_CFLAGS= -g1
 .endif
+.endif
+
+WARNS?=		0
 
 .include "../Makefile.inc"