Makefile: fix LTO

This commit allows -flto=thin to be added to the global CFLAGS, though
we don't enable it by default for the time being.

Makefile

@@ -387,6 +387,8 @@ BULK_MEMORY_SOURCES = \
     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memcpy.c \
     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memmove.c \
     $(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/memset.c
+NO_LTO_SOURCES = \
+    $(LIBC_TOP_HALF_MUSL_SRC_DIR)/exit/atexit.c
 LIBC_TOP_HALF_HEADERS_PRIVATE = $(LIBC_TOP_HALF_DIR)/headers/private
 LIBC_TOP_HALF_SOURCES = $(LIBC_TOP_HALF_DIR)/sources
 LIBC_TOP_HALF_ALL_SOURCES = \
@@ -495,6 +497,7 @@ MUSL_PRINTSCAN_OBJS = $(call objs,$(MUSL_PRINTSCAN_SOURCES))
 MUSL_PRINTSCAN_LONG_DOUBLE_OBJS = $(patsubst %.o,%.long-double.o,$(MUSL_PRINTSCAN_OBJS))
 MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS = $(patsubst %.o,%.no-floating-point.o,$(MUSL_PRINTSCAN_OBJS))
 BULK_MEMORY_OBJS = $(call objs,$(BULK_MEMORY_SOURCES))
+NO_LTO_OBJS = $(call objs,$(NO_LTO_SOURCES))
 LIBWASI_EMULATED_MMAN_OBJS = $(call objs,$(LIBWASI_EMULATED_MMAN_SOURCES))
 LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS = $(call objs,$(LIBWASI_EMULATED_PROCESS_CLOCKS_SOURCES))
 LIBWASI_EMULATED_GETPID_OBJS = $(call objs,$(LIBWASI_EMULATED_GETPID_SOURCES))
@@ -528,6 +531,7 @@ LIBWASI_EMULATED_PTHREAD_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULATED_PTH
 LIBDL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBDL_OBJS))
 LIBSETJMP_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBSETJMP_OBJS))
 BULK_MEMORY_SO_OBJS = $(patsubst %.o,%.pic.o,$(BULK_MEMORY_OBJS))
+NO_LTO_SO_OBJS = $(patsubst %.o,%.pic.o,$(NO_LTO_OBJS))
 DLMALLOC_SO_OBJS = $(patsubst %.o,%.pic.o,$(DLMALLOC_OBJS))
 LIBC_BOTTOM_HALF_ALL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBC_BOTTOM_HALF_ALL_OBJS))
 LIBC_TOP_HALF_ALL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBC_TOP_HALF_ALL_OBJS))
@@ -545,6 +549,7 @@ PIC_OBJS = \
 	$(LIBDL_SO_OBJS) \
 	$(LIBSETJMP_SO_OBJS) \
 	$(BULK_MEMORY_SO_OBJS) \
+    $(NO_LTO_SO_OBJS) \
 	$(DLMALLOC_SO_OBJS) \
 	$(LIBC_BOTTOM_HALF_ALL_SO_OBJS) \
 	$(LIBC_TOP_HALF_ALL_SO_OBJS) \
@@ -638,6 +643,9 @@ $(MUSL_PRINTSCAN_NO_FLOATING_POINT_OBJS): CFLAGS += \
 $(LIBSETJMP_OBJS) $(LIBSETJMP_SO_OBJS): CFLAGS += \
         -mllvm -wasm-enable-sjlj
 
+$(NO_LTO_OBJS) $(NO_LTO_SO_OBJS): CFLAGS += \
+        -fno-lto
+
 $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_SO_OBJS): CFLAGS += \
 	    -D_WASI_EMULATED_SIGNAL
 

libc-top-half/musl/src/exit/exit.c

@@ -2,7 +2,7 @@
 #include <stdint.h>
 #include "libc.h"
 
-static void dummy()
+static void dummy(void)
 {
 }