diff --git a/Makefile.rules b/Makefile.rules
index 7f917b479f..b9799272b8 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -20,6 +20,9 @@
 # Helpful functions
 # call with $(call function,...)
 tolower = $(shell echo $(1) | tr '[:upper:]' '[:lower:]')
+# Takes a list of MENUSELECT_CFLAG Id and returns CFLAGS to declare
+# the ones which are enabled.
+get_menuselect_cflags=$(patsubst %,-D%,$(filter $1,$(MENUSELECT_CFLAGS)))
 
 .PHONY: dist-clean
 
diff --git a/build_tools/make_buildopts_h b/build_tools/make_buildopts_h
index 57df27dd46..692e15b027 100755
--- a/build_tools/make_buildopts_h
+++ b/build_tools/make_buildopts_h
@@ -20,21 +20,30 @@ fi
 
 TMP=`${GREP} -e "^MENUSELECT_CFLAGS" menuselect.makeopts | sed 's/MENUSELECT_CFLAGS\=//g' | sed 's/-D//g'`
 for x in ${TMP}; do
-	echo "#define ${x} 1"
 	if test "${x}" = "AO2_DEBUG" \
 			-o "${x}" = "BETTER_BACKTRACES" \
 			-o "${x}" = "BUILD_NATIVE" \
+			-o "${x}" = "COMPILE_DOUBLE" \
+			-o "${x}" = "DEBUG_CHAOS" \
 			-o "${x}" = "DEBUG_SCHEDULER" \
 			-o "${x}" = "DETECT_DEADLOCKS" \
 			-o "${x}" = "DONT_OPTIMIZE" \
 			-o "${x}" = "DUMP_SCHEDULER" \
 			-o "${x}" = "LOTS_OF_SPANS" \
-			-o "${x}" = "LOW_MEMORY" \
 			-o "${x}" = "MALLOC_DEBUG" \
 			-o "${x}" = "RADIO_RELAX" \
 			-o "${x}" = "REBUILD_PARSERS" \
-			-o "${x}" = "REF_DEBUG" ; then
-		# These aren't ABI affecting options, keep them out of AST_BUILDOPTS
+			-o "${x}" = "REF_DEBUG" \
+			-o "${x}" = "USE_HOARD_ALLOCATOR" ; then
+		# These options are only for specific sources and have no effect on public ABI.
+		# Keep them out of buildopts.h so ccache does not invalidate all sources.
+		continue
+	fi
+
+	echo "#define ${x} 1"
+	if test "${x}" = "LOW_MEMORY" ; then
+		# LOW_MEMORY isn't an ABI affecting option but it is used in many sources
+		# so it gets defined globally but is not included in AST_BUILTOPTS.
 		continue
 	fi
 	if test "x${BUILDOPTS}" != "x" ; then
diff --git a/channels/Makefile b/channels/Makefile
index 6398d9599a..96421d82b0 100644
--- a/channels/Makefile
+++ b/channels/Makefile
@@ -29,6 +29,7 @@ $(call MOD_ADD_C,chan_pjsip,$(wildcard pjsip/*.c))
 $(call MOD_ADD_C,chan_dahdi,$(wildcard dahdi/*.c) sig_analog.c sig_pri.c sig_ss7.c)
 $(call MOD_ADD_C,chan_misdn,misdn_config.c misdn/isdn_lib.c misdn/isdn_msg_parser.c)
 
+chan_dahdi.o: _ASTCFLAGS+=$(call get_menuselect_cflags,LOTS_OF_SPANS)
 chan_mgcp.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
 chan_unistim.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
 chan_phone.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
diff --git a/include/asterisk/_private.h b/include/asterisk/_private.h
index 89a8f54b6c..d9547681aa 100644
--- a/include/asterisk/_private.h
+++ b/include/asterisk/_private.h
@@ -57,6 +57,22 @@ void ast_msg_shutdown(void);        /*!< Provided by message.c */
 int aco_init(void);             /*!< Provided by config_options.c */
 int dns_core_init(void);        /*!< Provided by dns_core.c */
 
+/*!
+ * \brief Initialize malloc debug phase 1.
+ *
+ * \note Must be called first thing after forking.
+ *
+ * \return Nothing
+ */
+void load_astmm_phase_1(void);
+
+/*!
+ * \brief Initialize malloc debug phase 2.
+ *
+ * \return Nothing
+ */
+void load_astmm_phase_2(void);
+
 /*!
  * \brief Initialize the bridging system.
  * \since 12.0.0
diff --git a/include/asterisk/astmm.h b/include/asterisk/astmm.h
index 13ebe030c1..e1f91ddeab 100644
--- a/include/asterisk/astmm.h
+++ b/include/asterisk/astmm.h
@@ -31,13 +31,6 @@ extern "C" {
 #define _ASTERISK_ASTMM_H
 /* IWYU pragma: private, include "asterisk.h" */
 
-#if defined(MALLOC_DEBUG) && !defined(STANDALONE) && !defined(STANDALONE2)
-#define __AST_DEBUG_MALLOC
-
-void __ast_mm_init_phase_1(void);
-void __ast_mm_init_phase_2(void);
-#endif
-
 void *ast_std_malloc(size_t size) attribute_malloc;
 void *ast_std_calloc(size_t nmemb, size_t size) attribute_malloc;
 void *ast_std_realloc(void *ptr, size_t size);
diff --git a/main/Makefile b/main/Makefile
index 0e29c843f0..1cb2c25eff 100644
--- a/main/Makefile
+++ b/main/Makefile
@@ -141,21 +141,33 @@ endif
 	$(CMD_PREFIX) cat $@.fix >> $@
 	$(CMD_PREFIX) rm $@.fix
 
-ast_expr2f.o: _ASTCFLAGS+=-Wno-unused
-cdr.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
+ifneq ($(findstring ENABLE_UPLOADS,$(MENUSELECT_CFLAGS)),)
+GMIMELDFLAGS+=$(GMIME_LIB)
+GMIMECFLAGS+=$(GMIME_INCLUDE)
+endif
+
+# Alter CFLAGS for specific sources
+stdtime/localtime.o: _ASTCFLAGS+=$(AST_NO_STRICT_OVERFLOW) -Wno-format-nonliteral
 
-db.o: _ASTCFLAGS+=$(SQLITE3_INCLUDE)
 asterisk.o: _ASTCFLAGS+=$(LIBEDIT_INCLUDE)
-json.o: _ASTCFLAGS+=$(JANSSON_INCLUDE)
+ast_expr2f.o: _ASTCFLAGS+=-Wno-unused
+astmm.o: _ASTCFLAGS+=$(call get_menuselect_cflags,MALLOC_DEBUG DEBUG_CHAOS)
+astobj2.o astobj2_container.o astobj2_hash.o astobj2_rbtree.o: _ASTCFLAGS+=$(call get_menuselect_cflags,AO2_DEBUG)
+backtrace.o: _ASTCFLAGS+=$(call get_menuselect_cflags,BETTER_BACKTRACES)
 bucket.o: _ASTCFLAGS+=$(URIPARSER_INCLUDE)
+cdr.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
 crypt.o: _ASTCFLAGS+=$(CRYPT_INCLUDE)
+db.o: _ASTCFLAGS+=$(SQLITE3_INCLUDE)
+dsp.o: _ASTCFLAGS+=$(call get_menuselect_cflags,RADIO_RELAX)
+http.o: _ASTCFLAGS+=$(GMIMECFLAGS)
+iostream.o: _ASTCFLAGS+=$(OPENSSL_INCLUDE)
+json.o: _ASTCFLAGS+=$(JANSSON_INCLUDE)
+lock.o: _ASTCFLAGS+=$(call get_menuselect_cflags,DETECT_DEADLOCKS)
+options.o: _ASTCFLAGS+=$(call get_menuselect_cflags,REF_DEBUG)
+sched.o: _ASTCFLAGS+=$(call get_menuselect_cflags,DEBUG_SCHEDULER DUMP_SCHEDULER)
+tcptls.o: _ASTCFLAGS+=$(OPENSSL_INCLUDE) -Wno-deprecated-declarations
 uuid.o: _ASTCFLAGS+=$(UUID_INCLUDE)
 
-ifneq ($(findstring ENABLE_UPLOADS,$(MENUSELECT_CFLAGS)),)
-http.o: _ASTCFLAGS+=$(GMIME_INCLUDE)
-endif
-
-stdtime/localtime.o: _ASTCFLAGS+=$(AST_NO_STRICT_OVERFLOW) -Wno-format-nonliteral
 
 OBJS:=$(sort $(OBJS))
 
@@ -169,10 +181,6 @@ else
 MAIN_TGT:=asterisk
 endif
 
-ifneq ($(findstring ENABLE_UPLOADS,$(MENUSELECT_CFLAGS)),)
-GMIMELDFLAGS+=$(GMIME_LIB)
-endif
-
 $(OBJS): _ASTCFLAGS+=-DAST_MODULE=\"core\" -DAST_IN_CORE
 $(MOD_OBJS): _ASTCFLAGS+=$(call MOD_ASTCFLAGS,$*)
 
@@ -306,9 +314,6 @@ endif
 
 endif
 
-iostream.o: _ASTCFLAGS+=$(OPENSSL_INCLUDE)
-tcptls.o: _ASTCFLAGS+=$(OPENSSL_INCLUDE) -Wno-deprecated-declarations
-
 $(MAIN_TGT): $(OBJS) $(MOD_OBJS) $(ASTSSL_LIB) $(ASTPJ_LIB)
 	@$(CC) -c -o buildinfo.o $(_ASTCFLAGS) buildinfo.c $(ASTCFLAGS)
 	$(ECHO_PREFIX) echo "   [LD] $(OBJS) $(MOD_OBJS) -> $@"
diff --git a/main/asterisk.c b/main/asterisk.c
index 4548420ee9..1d52567ba4 100644
--- a/main/asterisk.c
+++ b/main/asterisk.c
@@ -3964,9 +3964,7 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
 	 * an Asterisk instance, and that there isn't one already running. */
 	multi_thread_safe = 1;
 
-#if defined(__AST_DEBUG_MALLOC)
-	__ast_mm_init_phase_1();
-#endif	/* defined(__AST_DEBUG_MALLOC) */
+	load_astmm_phase_1();
 
 	/* Check whether high prio was succesfully set by us or some
 	 * other incantation. */
@@ -4171,9 +4169,7 @@ static void asterisk_daemon(int isroot, const char *runuser, const char *rungrou
 
 	pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
 
-#if defined(__AST_DEBUG_MALLOC)
-	__ast_mm_init_phase_2();
-#endif	/* defined(__AST_DEBUG_MALLOC) */
+	load_astmm_phase_2();
 
 	ast_cli_register_multiple(cli_asterisk_shutdown, ARRAY_LEN(cli_asterisk_shutdown));
 	ast_cli_register_multiple(cli_asterisk, ARRAY_LEN(cli_asterisk));
diff --git a/main/astmm.c b/main/astmm.c
index 08f67ab336..c845ee7c7a 100644
--- a/main/astmm.c
+++ b/main/astmm.c
@@ -31,6 +31,7 @@
 #define ASTMM_LIBC ASTMM_IGNORE
 #include "asterisk.h"
 
+#include "asterisk/_private.h"
 #include "asterisk/logger.h"
 
 /*!
@@ -62,6 +63,10 @@
 #define ast_log_safe ast_log
 #endif
 
+#if defined(MALLOC_DEBUG) && !defined(STANDALONE) && !defined(STANDALONE2)
+#define __AST_DEBUG_MALLOC
+#endif
+
 #define MALLOC_FAILURE_MSG \
 	ast_log_safe(LOG_ERROR, "Memory Allocation Failure in function %s at line %d of %s\n", func, lineno, file)
 
@@ -1501,14 +1506,7 @@ static void mm_atexit_final(void)
 	}
 }
 
-/*!
- * \brief Initialize malloc debug phase 1.
- *
- * \note Must be called first thing in main().
- *
- * \return Nothing
- */
-void __ast_mm_init_phase_1(void)
+void load_astmm_phase_1(void)
 {
 	atexit(mm_atexit_final);
 }
@@ -1522,12 +1520,7 @@ static void mm_atexit_ast(void)
 	ast_cli_unregister_multiple(cli_memory, ARRAY_LEN(cli_memory));
 }
 
-/*!
- * \brief Initialize malloc debug phase 2.
- *
- * \return Nothing
- */
-void __ast_mm_init_phase_2(void)
+void load_astmm_phase_2(void)
 {
 	char filename[PATH_MAX];
 
@@ -1550,6 +1543,14 @@ void __ast_mm_init_phase_2(void)
 
 #else	/* !defined(__AST_DEBUG_MALLOC) */
 
+void load_astmm_phase_1(void)
+{
+}
+
+void load_astmm_phase_2(void)
+{
+}
+
 void *__ast_repl_calloc(size_t nmemb, size_t size, const char *file, int lineno, const char *func)
 {
 	DEBUG_CHAOS_RETURN(DEBUG_CHAOS_ALLOC_CHANCE, NULL);
diff --git a/tests/Makefile b/tests/Makefile
index f64669bcdc..715c3f8593 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -19,5 +19,6 @@ all: _all
 
 include $(ASTTOPDIR)/Makefile.moddir_rules
 
+test_astobj2.o: _ASTCFLAGS+=$(call get_menuselect_cflags,AO2_DEBUG)
 test_strings.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION) $(AST_NO_STRINGOP_TRUNCATION)
 test_voicemail_api.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)
diff --git a/third-party/pjproject/Makefile b/third-party/pjproject/Makefile
index 476eb44017..c761cb59c7 100644
--- a/third-party/pjproject/Makefile
+++ b/third-party/pjproject/Makefile
@@ -64,9 +64,6 @@ ifeq ($(SPECIAL_TARGETS),)
         ifeq ($(AST_DEVMODE),yes)
             CF += -DPJPROJECT_BUNDLED_ASSERTIONS=yes
         endif
-        ifeq ($(findstring MALLOC_DEBUG,$(MENUSELECT_CFLAGS)),MALLOC_DEBUG)
-            CF += -DMALLOC_DEBUG
-        endif
         MALLOC_DEBUG_LIBS = source/pjsip-apps/lib/libasterisk_malloc_debug.a
         MALLOC_DEBUG_LDFLAGS = -L$(PJDIR)/pjsip-apps/lib -Wl,-whole-archive -lasterisk_malloc_debug -Wl,-no-whole-archive
         ifeq ($(findstring DONT_OPTIMIZE,$(MENUSELECT_CFLAGS)),)
diff --git a/utils/Makefile b/utils/Makefile
index 2ec1b917c6..738d1e42cd 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -172,6 +172,7 @@ threadstorage.c: $(ASTTOPDIR)/main/threadstorage.c
 	$(CMD_PREFIX) cp "$<" "$@"
 
 
+extconf.o: _ASTCFLAGS+=$(call get_menuselect_cflags,DETECT_DEADLOCKS)
 extconf.o: extconf.c
 
 conf2ael: LIBS+=$(AST_CLANG_BLOCKS_LIBS)