Add #define for main exit code

build/final.elf.map

@@ -112,23 +112,23 @@ LOAD linker stubs
  .debug_rnglists
                 0x00000013       0x19 build/startup.o
 
-.debug_macro    0x00000000     0x19f3
+.debug_macro    0x00000000     0x19f9
- .debug_macro   0x00000000      0xaaa build/main.o
+ .debug_macro   0x00000000      0xab0 build/main.o
- .debug_macro   0x00000aaa      0xafc build/startup.o
+ .debug_macro   0x00000ab0      0xafc build/startup.o
- .debug_macro   0x000015a6       0x22 build/startup.o
+ .debug_macro   0x000015ac       0x22 build/startup.o
- .debug_macro   0x000015c8       0x8e build/startup.o
+ .debug_macro   0x000015ce       0x8e build/startup.o
- .debug_macro   0x00001656       0x51 build/startup.o
+ .debug_macro   0x0000165c       0x51 build/startup.o
- .debug_macro   0x000016a7      0x103 build/startup.o
+ .debug_macro   0x000016ad      0x103 build/startup.o
- .debug_macro   0x000017aa       0x6a build/startup.o
+ .debug_macro   0x000017b0       0x6a build/startup.o
- .debug_macro   0x00001814      0x1df build/startup.o
+ .debug_macro   0x0000181a      0x1df build/startup.o
 
 .debug_line     0x00000000      0x120
  .debug_line    0x00000000       0x4f build/main.o
  .debug_line    0x0000004f       0xd1 build/startup.o
 
-.debug_str      0x00000000     0x3be8
+.debug_str      0x00000000     0x3bf0
- .debug_str     0x00000000     0x2da8 build/main.o
+ .debug_str     0x00000000     0x2db0 build/main.o
- .debug_str     0x00002da8      0xe40 build/startup.o
+ .debug_str     0x00002db0      0xe40 build/startup.o
                                0x3d41 (size before relaxing)
 
 .comment        0x00000000       0x45

build/main.S

@@ -26,7 +26,7 @@
 	.type	main, %function
 main:
 .LFB0:
-	.loc 1 1 16
+	.loc 1 3 16
 	.cfi_startproc
 	@ args = 0, pretend = 0, frame = 0
 	@ frame_needed = 1, uses_anonymous_args = 0
@@ -36,9 +36,9 @@ main:
 	.cfi_offset 7, -4
 	add	r7, sp, #0
 	.cfi_def_cfa_register 7
-	.loc 1 2 10
+	.loc 1 4 10
 	movs	r3, #42
-	.loc 1 3 1
+	.loc 1 5 1
 	mov	r0, r3
 	mov	sp, r7
 	.cfi_def_cfa_register 13
@@ -60,18 +60,18 @@ main:
 	.byte	0x4
 	.4byte	.Ldebug_abbrev0
 	.uleb128 0x1
-	.4byte	.LASF453
-	.byte	0x1d
 	.4byte	.LASF454
+	.byte	0x1d
 	.4byte	.LASF455
+	.4byte	.LASF456
 	.4byte	.LLRL0
 	.4byte	0
 	.4byte	.Ldebug_line0
 	.4byte	.Ldebug_macro0
 	.uleb128 0x2
-	.4byte	.LASF456
+	.4byte	.LASF457
-	.byte	0x1
 	.byte	0x1
+	.byte	0x3
 	.byte	0x5
 	.4byte	0x40
 	.4byte	.LFB0
@@ -1538,6 +1538,9 @@ main:
 	.byte	0x5
 	.uleb128 0
 	.4byte	.LASF452
+	.byte	0x5
+	.uleb128 0x1
+	.4byte	.LASF453
 	.byte	0x4
 	.byte	0
 	.section	.debug_line,"",%progbits
@@ -1732,7 +1735,7 @@ main:
 	.ascii	"__ARM_NEON\000"
 .LASF400:
 	.ascii	"__ARM_FEATURE_CMSE\000"
-.LASF455:
+.LASF456:
 	.ascii	"/home/alex/code/own/c-compile-experiments\000"
 .LASF229:
 	.ascii	"__FLT64_IS_IEC_60559__ 2\000"
@@ -2270,7 +2273,7 @@ main:
 	.ascii	"__UINT64_C(c) c ## ULL\000"
 .LASF310:
 	.ascii	"__LACCUM_EPSILON__ 0x1P-31LK\000"
-.LASF456:
+.LASF457:
 	.ascii	"main\000"
 .LASF250:
 	.ascii	"__SFRACT_EPSILON__ 0x1P-7HR\000"
@@ -2292,6 +2295,8 @@ main:
 	.ascii	"__INTPTR_MAX__ 0x7fffffff\000"
 .LASF385:
 	.ascii	"__PRAGMA_REDEFINE_EXTNAME 1\000"
+.LASF453:
+	.ascii	"exit 42\000"
 .LASF224:
 	.ascii	"__FLT64_EPSILON__ 2.2204460492503131e-16F64\000"
 .LASF40:
@@ -2334,7 +2339,7 @@ main:
 	.ascii	"__SIZE_TYPE__ unsigned int\000"
 .LASF321:
 	.ascii	"__ULLACCUM_FBIT__ 32\000"
-.LASF453:
+.LASF454:
 	.ascii	"GNU C17 12.3.1 20230626 -mcpu=cortex-m4 -mthumb -mf"
 	.ascii	"loat-abi=hard -mfpu=fpv4-sp-d16 -march=armv7e-m+fp "
 	.ascii	"-g3 -ggdb -O0 -ffunction-sections -fdata-sections -"
@@ -2378,7 +2383,7 @@ main:
 	.ascii	"L)\000"
 .LASF50:
 	.ascii	"__UINT64_TYPE__ long long unsigned int\000"
-.LASF454:
+.LASF455:
 	.ascii	"src/main.c\000"
 .LASF244:
 	.ascii	"__FLT32X_HAS_QUIET_NAN__ 1\000"

build/main.i

@@ -907,6 +907,8 @@
 # 0 "<command-line>"
 #define __USES_INITFINI__ 1
 # 1 "src/main.c"
+#define exit 42
+
 int main(void) {
   return 42;
 }

src/main.c

@@ -1,3 +1,5 @@
+#define exit 42
+
 int main(void) {
-  return 42;
+  return exit;
 }