Cleanup.

- Wrap `linalloc' macro replacement list with parentheses.
- Remove arena tests that are caught by `alloc_align' attribute.
- Add returns to test main.
- Add -fpie to test executables.

arena.h

@@ -12,7 +12,7 @@
 
 #include <stddef.h>
 
-#define linalloc(a, T) (T *)linalloc_explicit((a), sizeof(T), alignof(T))
+#define linalloc(a, T) ((T *)linalloc_explicit((a), sizeof(T), alignof(T)))
 
 typedef struct {
   void *hd, *tl;

test/Makefile

@@ -8,7 +8,7 @@ DELIM = echo "~~"
 ASAN = -fsanitize=address
 UBSAN = -fsanitize=undefined
 TSAN = -fsanitize=thread
-CFLAGS = -std=$(STD) -Wall -Wextra -Wconversion -Wno-sign-conversion -Wdouble-promotion -Wcast-qual -Wvla -Werror -pedantic -O0 -g3 -DNCOLOR=$(NCOLOR)
+CFLAGS = -std=$(STD) -Wall -Wextra -Wconversion -Wno-sign-conversion -Wdouble-promotion -Wcast-qual -Wvla -Werror -pedantic -O0 -g3 -DNCOLOR=$(NCOLOR) -fpie
 LDFLAGS = -Wl,-pie
 
 check: test_arena test_spinlock test_msi

test/arena.c

@@ -69,9 +69,6 @@ void alloc(void) {
   f = linalloc_explicit(&a, sizeof(*f), (uint16_t)1 << 4);
   f = linalloc(&a, float);
   *f = 1000.f;
-  die(linalloc_explicit(&a, 0, 0), "zeroed item size");
-  die(linalloc_explicit(&a, 10, -1), "negative alignment");
-  die(linalloc_explicit(&a, 10, 123), "alignment not a power-of-2");
   die(arena_delete(&a, -1, 0), "negative length");
   arena_delete(&a, pagesz + 123, 0);
 }
@@ -91,4 +88,5 @@ int main(void) {
   initndelete();
   alloc();
   hijack_alloc();
+  return 0;
 }

test/msi.c

@@ -51,4 +51,5 @@ int main(void) {
   suite();
   init();
   walk();
+  return 0;
 }

test/spinlock.c

@@ -37,4 +37,5 @@ void sum(void) {
 int main(void) {
   suite();
   sum();
+  return 0;
 }