Make some systemic improvements

- add vdso dump utility
- tests now log stack usage
- rename g_ftrace to __ftrace
- make internal spinlocks go faster
- add conformant c11 atomics library
- function tracing now logs stack usage
- make function call tracing thread safe
- add -X unsecure (no ssl) mode to redbean
- munmap() has more consistent behavior now
- pacify fsync() calls on python unit tests
- make --strace flag work better in redbean
- start minimizing and documenting compiler flags

libc/calls/calls.mk

@@ -65,31 +65,39 @@ $(LIBC_CALLS_A).pkg:					\
 		$(LIBC_CALLS_A_OBJS)			\
 		$(foreach x,$(LIBC_CALLS_A_DIRECTDEPS),$($(x)_A).pkg)
 
-o/$(MODE)/libc/calls/sigenter-freebsd.o			\
-o/$(MODE)/libc/calls/sigenter-netbsd.o			\
-o/$(MODE)/libc/calls/sigenter-openbsd.o			\
+# we can't use asan because:
+#   ucontext_t memory is owned by xnu kernel
 o/$(MODE)/libc/calls/sigenter-xnu.o:			\
 		OVERRIDE_COPTS +=			\
-			-mno-fentry			\
-			-fno-stack-protector		\
-			-fno-sanitize=all
+			-ffreestanding			\
+			-fno-sanitize=address
 
-o/$(MODE)/libc/calls/sys_mprotect.greg.o		\
-o/$(MODE)/libc/calls/vdsofunc.greg.o			\
-o/$(MODE)/libc/calls/directmap.o			\
-o/$(MODE)/libc/calls/directmap-nt.o			\
-o/$(MODE)/libc/calls/mapstack.greg.o			\
-o/$(MODE)/libc/calls/execve-nt.greg.o			\
-o/$(MODE)/libc/calls/getcwd.greg.o			\
-o/$(MODE)/libc/calls/getcwd-xnu.greg.o			\
-o/$(MODE)/libc/calls/getprogramexecutablename.greg.o	\
-o/$(MODE)/libc/calls/raise.o:				\
+# we can't use asan because:
+#   vdso memory is owned by linux kernel
+o/$(MODE)/libc/calls/vdsofunc.greg.o:			\
 		OVERRIDE_COPTS +=			\
 			-ffreestanding			\
-			$(NO_MAGIC)
+			-fno-sanitize=address
 
-o/$(MODE)/libc/calls/termios2linux.o			\
-o/$(MODE)/libc/calls/termios2host.o			\
+# we can't use asan because:
+#   asan guard pages haven't been allocated yet
+o/$(MODE)/libc/calls/directmap.o			\
+o/$(MODE)/libc/calls/directmap-nt.o:			\
+		OVERRIDE_COPTS +=			\
+			-ffreestanding			\
+			-fno-sanitize=address
+
+# we can't use asan because:
+#   ntspawn allocates 128kb of heap memory via win32
+o/$(MODE)/libc/calls/ntspawn.o				\
+o/$(MODE)/libc/calls/mkntcmdline.o			\
+o/$(MODE)/libc/calls/mkntenvblock.o:			\
+		OVERRIDE_COPTS +=			\
+			-ffreestanding			\
+			-fno-sanitize=address
+
+# we always want -O3 because:
+#   it makes the code size smaller too
 o/$(MODE)/libc/calls/sigenter-freebsd.o			\
 o/$(MODE)/libc/calls/sigenter-netbsd.o			\
 o/$(MODE)/libc/calls/sigenter-openbsd.o			\
@@ -98,7 +106,36 @@ o/$(MODE)/libc/calls/ntcontext2linux.o:			\
 		OVERRIDE_COPTS +=			\
 			-O3
 
-# TODO(jart): make va_arg optimize well in default mode
+# we must disable static stack safety because:
+#   these functions use alloca(n)
+o/$(MODE)/libc/calls/execl.o				\
+o/$(MODE)/libc/calls/execle.o				\
+o/$(MODE)/libc/calls/execlp.o				\
+o/$(MODE)/libc/calls/execve-sysv.o			\
+o/$(MODE)/libc/calls/mkntenvblock.o:			\
+		OVERRIDE_CPPFLAGS +=			\
+			-DSTACK_FRAME_UNLIMITED
+
+# we must disable static stack safety because:
+#   PATH_MAX*sizeof(char16_t)*2 exceeds 4096 byte frame limit
+o/$(MODE)/libc/calls/copyfile.o				\
+o/$(MODE)/libc/calls/symlinkat-nt.o			\
+o/$(MODE)/libc/calls/readlinkat-nt.o			\
+o/$(MODE)/libc/calls/linkat-nt.o			\
+o/$(MODE)/libc/calls/renameat-nt.o:			\
+		OVERRIDE_CPPFLAGS +=			\
+			-DSTACK_FRAME_UNLIMITED
+
+# we must segregate codegen because:
+#   file contains multiple independently linkable apis
+o/$(MODE)/libc/calls/ioctl-siocgifconf.o		\
+o/$(MODE)/libc/calls/ioctl-siocgifconf-nt.o:		\
+		OVERRIDE_COPTS +=			\
+			-ffunction-sections		\
+			-fdata-sections
+
+# we always want -Os because:
+#   va_arg codegen is very bloated in default mode
 o//libc/calls/open.o					\
 o//libc/calls/openat.o					\
 o//libc/calls/prctl.o					\
@@ -120,27 +157,6 @@ o//libc/calls/fcntl.o:					\
 		OVERRIDE_CFLAGS +=			\
 			-Os
 
-# must use alloca() or path_max*2*2
-o/$(MODE)/libc/calls/execl.o				\
-o/$(MODE)/libc/calls/execle.o				\
-o/$(MODE)/libc/calls/execlp.o				\
-o/$(MODE)/libc/calls/copyfile.o				\
-o/$(MODE)/libc/calls/execve-nt.greg.o			\
-o/$(MODE)/libc/calls/linkat-nt.o			\
-o/$(MODE)/libc/calls/renameat-nt.o			\
-o/$(MODE)/libc/calls/execve-sysv.o			\
-o/$(MODE)/libc/calls/symlinkat-nt.o			\
-o/$(MODE)/libc/calls/readlinkat-nt.o			\
-o/$(MODE)/libc/calls/mkntenvblock.o:			\
-		OVERRIDE_CPPFLAGS +=			\
-			-DSTACK_FRAME_UNLIMITED
-
-o/$(MODE)/libc/calls/ioctl-siocgifconf.o		\
-o/$(MODE)/libc/calls/ioctl-siocgifconf-nt.o:		\
-		OVERRIDE_COPTS +=			\
-			-ffunction-sections		\
-			-fdata-sections
-
 LIBC_CALLS_LIBS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)))
 LIBC_CALLS_SRCS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_SRCS))
 LIBC_CALLS_HDRS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_HDRS))