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Author SHA1 Message Date
Fangrui Song 9d117e7b2a Define __GCC_HAVE_DWARF2_CFI_ASM if applicable 
In -fno-exceptions -fno-asynchronous-unwind-tables -g0 mode,
GCC does not emit `.cfi_*` directives.

```
% diff <(gcc -fno-asynchronous-unwind-tables -dM -E a.c) <(gcc -dM -E a.c)
130a131
> #define __GCC_HAVE_DWARF2_CFI_ASM 1
```

This macro is useful because code can decide whether inline asm should include `.cfi_*` directives.
`.cfi_*` directives without `.cfi_startproc` can cause assembler errors
(integrated assembler: `this directive must appear between .cfi_startproc and .cfi_endproc directives`).

Differential Revision: https://reviews.llvm.org/D97743
 2021-03-09 22:21:36 -08:00
Fangrui Song b4948c27d2 Revert D97743 "Define __GCC_HAVE_DWARF2_CFI_ASM if applicable" 
This reverts commit c11ff4bbad & df67d35269.

Trying to make the change to the driver to avoid round-trip issues.
 2021-03-09 12:14:12 -08:00
Fangrui Song c11ff4bbad Define __GCC_HAVE_DWARF2_CFI_ASM if applicable 
In -fno-exceptions -fno-asynchronous-unwind-tables -g0 mode,
GCC does not emit `.cfi_*` directives.

```
% diff <(gcc -fno-asynchronous-unwind-tables -dM -E a.c) <(gcc -dM -E a.c)
130a131
> #define __GCC_HAVE_DWARF2_CFI_ASM 1
```

This macro is useful because code can decide whether inline asm should include `.cfi_*` directives.
`.cfi_*` directives without `.cfi_startproc` can cause assembler errors
(integrated assembler: `this directive must appear between .cfi_startproc and .cfi_endproc directives`).

Differential Revision: https://reviews.llvm.org/D97743
 2021-03-09 10:52:26 -08:00