commit 3de0c24859f4413bf03448249078169bb50bda0f
Author: divanorama <divanorama@gmail.com>
Date:   Thu Sep 29 23:35:59 2022 +0200

    Disable builtin malloc in tests
    
    With `--with-jemalloc-prefix=` and without `-fno-builtin` or `-O1` both clang and gcc may optimize out `malloc` calls
    whose result is unused. Comparing result to NULL also doesn't necessarily count as being used.
    
    This won't be a problem in most client programs as this only concerns really unused pointers, but in
    tests it's important to actually execute allocations.
    `-fno-builtin` should disable this optimization for both gcc and clang, and applying it only to tests code shouldn't hopefully be an issue.
    Another alternative is to force "use" of result but that'd require more changes and may miss some other optimization-related issues.
    
    This should resolve https://github.com/jemalloc/jemalloc/issues/2091

diff --git a/Makefile.in b/Makefile.in
index 6809fb29..a964f07e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -458,6 +458,8 @@ $(TESTS_OBJS): $(objroot)test/%.$(O): $(srcroot)test/%.c
 $(TESTS_CPP_OBJS): $(objroot)test/%.$(O): $(srcroot)test/%.cpp
 $(TESTS_OBJS): CPPFLAGS += -I$(srcroot)test/include -I$(objroot)test/include
 $(TESTS_CPP_OBJS): CPPFLAGS += -I$(srcroot)test/include -I$(objroot)test/include
+$(TESTS_OBJS): CFLAGS += -fno-builtin
+$(TESTS_CPP_OBJS): CPPFLAGS += -fno-builtin
 ifneq ($(IMPORTLIB),$(SO))
 $(CPP_OBJS) $(C_SYM_OBJS) $(C_OBJS) $(C_JET_SYM_OBJS) $(C_JET_OBJS): CPPFLAGS += -DDLLEXPORT
 endif