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Do not warn about unused macros while processing #pragma GCC optimize

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libcpp

	PR c++/91318
	* include/cpplib.h: Added cpp_define_unused(), cpp_define_formatted_unused()
	* directives.c: Likewise.

gcc/c-family

	PR c++/91318
	* c-cppbuiltin.c: c_cpp_builtins_optimize_pragma(): use cpp_define_unused()
This commit is contained in:
Piotr H. Dabrowski 2020-11-13 12:27:16 -05:00 • committed by Jeff Law
parent e7e0eeeb6e
commit 6f1ae1ecd3
3 changed files with 34 additions and 7 deletions
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14
gcc/c-family/c-cppbuiltin.c
View file

@ -581,41 +581,41 @@ c_cpp_builtins_optimize_pragma (cpp_reader *pfile, tree prev_tree,
/* Other target-independent built-ins determined by command-line
options. */
if (!prev->x_optimize_size && cur->x_optimize_size)
cpp_define (pfile, "__OPTIMIZE_SIZE__");
cpp_define_unused (pfile, "__OPTIMIZE_SIZE__");
else if (prev->x_optimize_size && !cur->x_optimize_size)
cpp_undef (pfile, "__OPTIMIZE_SIZE__");
if (!prev->x_optimize && cur->x_optimize)
cpp_define (pfile, "__OPTIMIZE__");
cpp_define_unused (pfile, "__OPTIMIZE__");
else if (prev->x_optimize && !cur->x_optimize)
cpp_undef (pfile, "__OPTIMIZE__");
prev_fast_math = fast_math_flags_struct_set_p (prev);
cur_fast_math = fast_math_flags_struct_set_p (cur);
if (!prev_fast_math && cur_fast_math)
cpp_define (pfile, "__FAST_MATH__");
cpp_define_unused (pfile, "__FAST_MATH__");
else if (prev_fast_math && !cur_fast_math)
cpp_undef (pfile, "__FAST_MATH__");
if (!prev->x_flag_signaling_nans && cur->x_flag_signaling_nans)
cpp_define (pfile, "__SUPPORT_SNAN__");
cpp_define_unused (pfile, "__SUPPORT_SNAN__");
else if (prev->x_flag_signaling_nans && !cur->x_flag_signaling_nans)
cpp_undef (pfile, "__SUPPORT_SNAN__");
if (!prev->x_flag_errno_math && cur->x_flag_errno_math)
cpp_undef (pfile, "__NO_MATH_ERRNO__");
else if (prev->x_flag_errno_math && !cur->x_flag_errno_math)
cpp_define (pfile, "__NO_MATH_ERRNO__");
cpp_define_unused (pfile, "__NO_MATH_ERRNO__");
if (!prev->x_flag_finite_math_only && cur->x_flag_finite_math_only)
{
cpp_undef (pfile, "__FINITE_MATH_ONLY__");
cpp_define (pfile, "__FINITE_MATH_ONLY__=1");
cpp_define_unused (pfile, "__FINITE_MATH_ONLY__=1");
}
else if (prev->x_flag_finite_math_only && !cur->x_flag_finite_math_only)
{
cpp_undef (pfile, "__FINITE_MATH_ONLY__");
cpp_define (pfile, "__FINITE_MATH_ONLY__=0");
cpp_define_unused (pfile, "__FINITE_MATH_ONLY__=0");
}
}

23
libcpp/directives.c
View file

@ -2412,6 +2412,15 @@ cpp_define (cpp_reader *pfile, const char *str)
run_directive (pfile, T_DEFINE, buf, count);
}
/* Like cpp_define, but does not warn about unused macro. */
void
cpp_define_unused (cpp_reader *pfile, const char *str)
{
unsigned char warn_unused_macros = CPP_OPTION (pfile, warn_unused_macros);
CPP_OPTION (pfile, warn_unused_macros) = 0;
cpp_define (pfile, str);
CPP_OPTION (pfile, warn_unused_macros) = warn_unused_macros;
}
/* Use to build macros to be run through cpp_define() as
described above.
@ -2431,6 +2440,20 @@ cpp_define_formatted (cpp_reader *pfile, const char *fmt, ...)
free (ptr);
}
/* Like cpp_define_formatted, but does not warn about unused macro. */
void
cpp_define_formatted_unused (cpp_reader *pfile, const char *fmt, ...)
{
char *ptr;
va_list ap;
va_start (ap, fmt);
ptr = xvasprintf (fmt, ap);
va_end (ap);
cpp_define_unused (pfile, ptr);
free (ptr);
}
/* Slight variant of the above for use by initialize_builtins. */
void

4
libcpp/include/cpplib.h
View file

@ -1076,8 +1076,12 @@ extern cppchar_t cpp_host_to_exec_charset (cpp_reader *, cppchar_t);
/* Used to register macros and assertions, perhaps from the command line.
The text is the same as the command line argument. */
extern void cpp_define (cpp_reader *, const char *);
extern void cpp_define_unused (cpp_reader *, const char *);
extern void cpp_define_formatted (cpp_reader *pfile,
const char *fmt, ...) ATTRIBUTE_PRINTF_2;
extern void cpp_define_formatted_unused (cpp_reader *pfile,
const char *fmt,
...) ATTRIBUTE_PRINTF_2;
extern void cpp_assert (cpp_reader *, const char *);
extern void cpp_undef (cpp_reader *, const char *);
extern void cpp_unassert (cpp_reader *, const char *);