-fintegrated-as vs -fno-integrated-as bug

gistfile1.c

[15:00:32] ✘ jroelofs@build1-lucid-cs arm-none-eabi-lite$ cat foobar.c
#if defined(MACRO_OUTSIDE)
asm(
    ".macro  RETURN	cond=\n\t"
    "bx\\cond	lr\n\t"
    ".endm\n\t"
    );
#endif

char* __attribute__((naked))
foo(char* bar)
{
  asm (
#if !defined(MACRO_OUTSIDE)
    ".macro  RETURN	cond=\n\t"
    "bx\\cond	lr\n\t"
    ".endm\n\t"
#endif
    "RETURN\n"
       );
}
[15:00:37] ✔ jroelofs@build1-lucid-cs arm-none-eabi-lite$ install/opt/codesourcery/bin/clang -target arm-none-eabi -march=armv7 -g -O2 -c foobar.c -fintegrated-as
[15:00:57] ✔ jroelofs@build1-lucid-cs arm-none-eabi-lite$ install/opt/codesourcery/bin/clang -target arm-none-eabi -march=armv7 -g -O2 -c foobar.c -fno-integrated-as
[15:01:15] ✔ jroelofs@build1-lucid-cs arm-none-eabi-lite$ install/opt/codesourcery/bin/clang -target arm-none-eabi -march=armv7 -g -O2 -c foobar.c -fno-integrated-as -DMACRO_OUTSIDE
[15:01:24] ✔ jroelofs@build1-lucid-cs arm-none-eabi-lite$ install/opt/codesourcery/bin/clang -target arm-none-eabi -march=armv7 -g -O2 -c foobar.c -fintegrated-as -DMACRO_OUTSIDE
foobar.c:18:5: error: invalid instruction
    "RETURN\n"
    ^
<inline asm>:1:2: note: instantiated into assembly here
        RETURN
        ^~~~~~
1 error generated.
[15:01:37] ✘ jroelofs@build1-lucid-cs arm-none-eabi-lite$