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#### 15.22.5 Macros for SDB and DWARF Output

Here are macros for SDB and DWARF output.

— Macro: SDB_DEBUGGING_INFO

> Define this macro if GCC should produce COFF-style debugging output for SDB in response to the -g option.

— Macro: DWARF2_DEBUGGING_INFO

> Define this macro if GCC should produce dwarf version 2 format debugging output in response to the -g option.

> — Target Hook: int TARGET_DWARF_CALLING_CONVENTION (tree function)

> > Define this to enable the dwarf attribute `DW_AT_calling_convention` to be emitted for each function. Instead of an integer return the enum value for the `DW_CC_` tag.

> To support optional call frame debugging information, you must also define `INCOMING_RETURN_ADDR_RTX` and either set `RTX_FRAME_RELATED_P` on the prologue insns if you use RTL for the prologue, or call `dwarf2out_def_cfa` and `dwarf2out_reg_save` as appropriate from `TARGET_ASM_FUNCTION_PROLOGUE` if you don't.

— Macro: DWARF2_FRAME_INFO

> Define this macro to a nonzero value if GCC should always output Dwarf 2 frame information. If `DWARF2_UNWIND_INFO` (see Exception Region Output is nonzero, GCC will output this information not matter how you define `DWARF2_FRAME_INFO`.

— Macro: DWARF2_ASM_LINE_DEBUG_INFO

> Define this macro to be a nonzero value if the assembler can generate Dwarf 2 line debug info sections. This will result in much more compact line number tables, and hence is desirable if it works.

— Macro: ASM_OUTPUT_DWARF_DELTA (stream, size, label1, label2)

> A C statement to issue assembly directives that create a difference lab1 minus lab2, using an integer of the given size.

— Macro: ASM_OUTPUT_DWARF_OFFSET (stream, size, label, section)

> A C statement to issue assembly directives that create a section-relative reference to the given label, using an integer of the given size. The label is known to be defined in the given section.

— Macro: ASM_OUTPUT_DWARF_PCREL (stream, size, label)

> A C statement to issue assembly directives that create a self-relative reference to the given label, using an integer of the given size.

— Target Hook: void TARGET_ASM_OUTPUT_DWARF_DTPREL (FILE *FILE, int size, rtx x)

> If defined, this target hook is a function which outputs a DTP-relative reference to the given TLS symbol of the specified size.

— Macro: PUT_SDB_...

> Define these macros to override the assembler syntax for the special SDB assembler directives. See sdbout.c for a list of these macros and their arguments. If the standard syntax is used, you need not define them yourself.

— Macro: SDB_DELIM

> Some assemblers do not support a semicolon as a delimiter, even between SDB assembler directives. In that case, define this macro to be the delimiter to use (usually \n). It is not necessary to define a new set of `PUT_SDB_`op macros if this is the only change required.

— Macro: SDB_ALLOW_UNKNOWN_REFERENCES

> Define this macro to allow references to unknown structure, union, or enumeration tags to be emitted. Standard COFF does not allow handling of unknown references, MIPS ECOFF has support for it.

— Macro: SDB_ALLOW_FORWARD_REFERENCES

> Define this macro to allow references to structure, union, or enumeration tags that have not yet been seen to be handled. Some assemblers choke if forward tags are used, while some require it.

— Macro: SDB_OUTPUT_SOURCE_LINE (stream, line)

> A C statement to output SDB debugging information before code for line number line of the current source file to the stdio stream stream. The default is to emit an `.ln` directive.