This macro is similar to @code{LINK_LIBGCC_SPECIAL}, except that it does
not affect @samp{-L} options.
+@findex LINK_COMMAND_SPEC
+@item LINK_COMMAND_SPEC
+A C string constant giving the complete command line need to execute the
+linker. When you do this, you will need to update your port each time a
+change is made to the link command line within @file{gcc.c}. Therefore,
+define this macro only if you need to completely redefine the command
+line for invoking the linker and there is no other way to accomplish
+the effect you need.
+
@findex MULTILIB_DEFAULTS
@item MULTILIB_DEFAULTS
Define this macro as a C expression for the initializer of an array of
with a subgrouping for each command option.
Each subgrouping contains a string constant, that defines the option
-name, and a number, which contains the bits to set in
-@code{target_flags}. A negative number says to clear bits instead;
-the negative of the number is which bits to clear. The actual option
-name is made by appending @samp{-m} to the specified name.
+name, a number, which contains the bits to set in
+@code{target_flags}, and a second string which is the description
+displayed by --help. If the number is negative then the bits specified
+by the number are cleared instead of being set. If the description
+string is present but empty, then no help information will be displayed
+for that option, but it will not count as an undocumented option. The
+actual option name is made by appending @samp{-m} to the specified name.
One of the subgroupings should have a null string. The number in
this grouping is the default value for @code{target_flags}. Any
@smallexample
#define TARGET_SWITCHES \
- @{ @{ "68020", 1@}, \
- @{ "68000", -1@}, \
- @{ "", 1@}@}
+ @{ @{ "68020", 1, "" @}, \
+ @{ "68000", -1, "Compile for the 68000" @}, \
+ @{ "", 1, "" @}@}
@end smallexample
@findex TARGET_OPTIONS
subgrouping for each command option.
Each subgrouping contains a string constant, that defines the fixed part
-of the option name, and the address of a variable. The variable, type
-@code{char *}, is set to the variable part of the given option if the fixed
-part matches. The actual option name is made by appending @samp{-m} to the
-specified name.
+of the option name, the address of a variable, and a description string.
+The variable, type @code{char *}, is set to the variable part of the
+given option if the fixed part matches. The actual option name is made
+by appending @samp{-m} to the specified name.
Here is an example which defines @samp{-mshort-data-@var{number}}. If the
given option is @samp{-mshort-data-512}, the variable @code{m88k_short_data}
@smallexample
extern char *m88k_short_data;
#define TARGET_OPTIONS \
- @{ @{ "short-data-", &m88k_short_data @} @}
+ @{ @{ "short-data-", &m88k_short_data, "Specify the size of the short data section" @} @}
@end smallexample
@findex TARGET_VERSION
appropriate sizes. If this macro is undefined, @code{GET_MODE_BITSIZE
(DImode)} is assumed.
+@findex STACK_SAVEAREA_MODE
+@item STACK_SAVEAREA_MODE (@var{save_level})
+If defined, an expression of type @code{enum machine_mode} that
+specifies the mode of the save area operand of a
+@code{save_stack_@var{level}} named pattern (@pxref{Standard Names}).
+@var{save_level} is one of @code{SAVE_BLOCK}, @code{SAVE_FUNCTION}, or
+@code{SAVE_NONLOCAL} and selects which of the three named patterns is
+having its mode specified.
+
+You need not define this macro if it always returns @code{Pmode}. You
+would most commonly define this macro if the
+@code{save_stack_@var{level}} patterns need to support both a 32- and a
+64-bit mode.
+
+@findex STACK_SIZE_MODE
+@item STACK_SIZE_MODE
+If defined, an expression of type @code{enum machine_mode} that
+specifies the mode of the size increment operand of an
+@code{allocate_stack} named pattern (@pxref{Standard Names}).
+
+You need not define this macro if it always returns @code{word_mode}.
+You would most commonly define this macro if the @code{allocate_stack}
+pattern needs to support both a 32- and a 64-bit mode.
+
@findex CHECK_FLOAT_VALUE
@item CHECK_FLOAT_VALUE (@var{mode}, @var{value}, @var{overflow})
A C statement to validate the value @var{value} (of type
and it is quite easy to produce macros that build in too much knowledge
of reload internals.
+@emph{Note}: This macro must be able to reload an address created by a
+previous invocation of this macro. If it fails to handle such addresses
+then the compiler may generate incorrect code or abort.
+
@findex push_reload
The macro definition should use @code{push_reload} to indicate parts that
need reloading; @var{opnum}, @var{type} and @var{ind_levels} are usually
prologue, or call @code{dwarf2out_def_cfa} and @code{dwarf2out_reg_save}
as appropriate from @code{FUNCTION_PROLOGUE} if you don't.
+@findex DWARF2_FRAME_INFO
+@item DWARF2_FRAME_INFO
+Define this macro to a nonzero value if GNU CC should always output
+Dwarf 2 frame information. If @code{DWARF2_UNWIND_INFO}
+(@pxref{Exception Region Output} is nonzero, GNU CC will output this
+information not matter how you define @code{DWARF2_FRAME_INFO}.
+
@findex LINKER_DOES_NOT_WORK_WITH_DWARF2
@item LINKER_DOES_NOT_WORK_WITH_DWARF2
Define this macro if the linker does not work with Dwarf version 2.
overrides another, or when an attribute is nullified by a subsequent
definition.
+@findex SET_DEFAULT_DECL_ATTRIBUTES
+@item SET_DEFAULT_DECL_ATTRIBUTES (@var{decl}, @var{attributes})
+If defined, a C statement that assigns default attributes to
+newly defined @var{decl}.
+
@findex DOLLARS_IN_IDENTIFIERS
@item DOLLARS_IN_IDENTIFIERS
Define this macro to control use of the character @samp{$} in identifier
same time if the machine is a superscalar machine. This is only used by
the @samp{Haifa} scheduler, and not the traditional scheduler.
+@findex MD_SCHED_INIT
+@item MD_SCHED_INIT (@var{file}, @var{verbose}
+A C statement which is executed by the @samp{Haifa} scheduler at the
+beginning of each block of instructions that are to be scheduled.
+@var{file} is either a null pointer, or a stdio stream to write any
+debug output to. @var{verbose} is the verbose level provided by
+@samp{-fsched-verbose-}@var{n}.
+
+@findex MD_SCHED_REORDER
+@item MD_SCHED_REORDER (@var{file}, @var{verbose}, @var{ready}, @var{n_ready})
+A C statement which is executed by the @samp{Haifa} scheduler after it
+has scheduled the ready list to allow the machine description to reorder
+it (for example to combine two small instructions together on
+@samp{VLIW} machines). @var{file} is either a null pointer, or a stdio
+stream to write any debug output to. @var{verbose} is the verbose level
+provided by @samp{-fsched-verbose-}@var{n}. @var{ready} is a pointer to
+the ready list of instructions that are ready to be scheduled.
+@var{n_ready} is the number of elements in the ready list. The
+scheduler reads the ready list in reverse order, starting with
+@var{ready}[@var{n_ready}-1] and going to @var{ready}[0].
+
+@findex MD_SCHED_VARIABLE_ISSUE
+@item MD_SCHED_VARIABLE_ISSUE (@var{file}, @var{verbose}, @var{insn}, @var{more})
+A C statement which is executed by the @samp{Haifa} scheduler after it
+has scheduled an insn from the ready list. @var{file} is either a null
+pointer, or a stdio stream to write any debug output to. @var{verbose}
+is the verbose level provided by @samp{-fsched-verbose-}@var{n}.
+@var{insn} is the instruction that was scheduled. @var{more} is the
+number of instructions that can be issued in the current cycle. The
+@samp{MD_SCHED_VARIABLE_ISSUE} macro is responsible for updating the
+value of @var{more} (typically by @var{more}--).
+
@findex MAX_INTEGER_COMPUTATION_MODE
@item MAX_INTEGER_COMPUTATION_MODE
Define this to the largest integer machine mode which can be used for
You need only define this macro if the target holds values larger than
@code{word_mode} in general purpose registers. Most targets should not define
this macro.
+
+@findex NEED_MATH_LIBRARY
+@item NEED_MATH_LIBRARY
+Define this macro as a C expression that is nonzero if @code{g++} should
+automatically link in the math library or to zero if @code{g++} should not
+automatically link in the math library.
+
+You need only define this macro if the target does not always need the math
+library linked into C++ programs.
@end table
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