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Commit 75227a33 by Geoffrey Keating Committed by Geoffrey Keating
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toplev.c (documented_lang_options): Document more language-specific options. 

	* toplev.c (documented_lang_options): Document more
	language-specific options.
	* doc/invoke.texi (Warning Options): Correct documentation for
	-Wno-multichar, -Wno-div-by-zero, and -Wsystem-headers.
	* c-decl.c (c_decode_option): Use a table to handle warning options.

From-SVN: r50299
parent 4f1aac42
Showing with 119 additions and 187 deletions
gcc/ChangeLog
2002-03-04 Geoffrey Keating <geoffk@redhat.com>
* toplev.c (documented_lang_options): Document more
language-specific options.
* doc/invoke.texi (Warning Options): Correct documentation for
-Wno-multichar, -Wno-div-by-zero, and -Wsystem-headers.
* c-decl.c (c_decode_option): Use a table to handle warning options.
2002-03-05 Hans-Peter Nilsson <hp@bitrange.com>
* config/mmix/mmix.h (ENCODE_SECTION_INFO): Pass on new second
......
gcc/c-decl.c
......@@ -460,6 +460,50 @@ c_decode_option (argc, argv)
int strings_processed;
char *p = argv[0];
static const struct {
/* The name of the option. */
const char *option;
/* If non-NULL, a flag variable to set to 0 or 1. If NULL,
this means that cpp handles this option. */
int *flag;
} warn_options[] = {
/* This list is in alphabetical order. Keep it like that. */
{ "bad-function-cast", &warn_bad_function_cast },
{ "cast-qual", &warn_cast_qual },
{ "char-subscripts", &warn_char_subscripts },
{ "comment", NULL },
{ "comments", NULL },
{ "conversion", &warn_conversion },
{ "div-by-zero", &warn_div_by_zero },
{ "float-equal", &warn_float_equal },
{ "format-extra-args", &warn_format_extra_args },
{ "format-nonliteral", &warn_format_nonliteral },
{ "format-security", &warn_format_security },
{ "format-y2k", &warn_format_y2k },
{ "implicit-function-declaration", &mesg_implicit_function_declaration },
{ "implicit-int", &warn_implicit_int },
{ "import", NULL },
{ "long-long", &warn_long_long },
{ "main", &warn_main },
{ "missing-braces", &warn_missing_braces },
{ "missing-declarations", &warn_missing_declarations },
{ "missing-format-attribute", &warn_missing_format_attribute },
{ "missing-prototypes", &warn_missing_prototypes },
{ "multichar", &warn_multichar },
{ "nested-externs", &warn_nested_externs },
{ "parentheses", &warn_parentheses },
{ "pointer-arith", &warn_pointer_arith },
{ "redundant-decls", &warn_redundant_decls },
{ "return-type", &warn_return_type },
{ "sequence-point", &warn_sequence_point },
{ "sign-compare", &warn_sign_compare },
{ "strict-prototypes", &warn_strict_prototypes },
{ "traditional", &warn_traditional },
{ "trigraphs", NULL },
{ "undef", NULL },
{ "write-strings", &flag_const_strings }
};
strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
......@@ -595,14 +639,12 @@ c_decode_option (argc, argv)
goto iso_1990;
else if (!strcmp (p, "-Werror-implicit-function-declaration"))
mesg_implicit_function_declaration = 2;
else if (!strcmp (p, "-Wimplicit-function-declaration"))
mesg_implicit_function_declaration = 1;
else if (!strcmp (p, "-Wno-implicit-function-declaration"))
mesg_implicit_function_declaration = 0;
else if (!strcmp (p, "-Wimplicit-int"))
warn_implicit_int = 1;
else if (!strcmp (p, "-Wno-implicit-int"))
warn_implicit_int = 0;
else if (!strncmp (p, "-Wformat=", 9))
set_Wformat (atoi (p + 9));
else if (!strcmp (p, "-Wformat"))
set_Wformat (1);
else if (!strcmp (p, "-Wno-format"))
set_Wformat (0);
else if (!strcmp (p, "-Wimplicit"))
{
warn_implicit_int = 1;
......@@ -611,142 +653,8 @@ c_decode_option (argc, argv)
}
else if (!strcmp (p, "-Wno-implicit"))
warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
else if (!strcmp (p, "-Wlong-long"))
warn_long_long = 1;
else if (!strcmp (p, "-Wno-long-long"))
warn_long_long = 0;
else if (!strcmp (p, "-Wwrite-strings"))
flag_const_strings = 1;
else if (!strcmp (p, "-Wno-write-strings"))
flag_const_strings = 0;
else if (!strcmp (p, "-Wcast-qual"))
warn_cast_qual = 1;
else if (!strcmp (p, "-Wno-cast-qual"))
warn_cast_qual = 0;
else if (!strcmp (p, "-Wbad-function-cast"))
warn_bad_function_cast = 1;
else if (!strcmp (p, "-Wno-bad-function-cast"))
warn_bad_function_cast = 0;
else if (!strcmp (p, "-Wno-missing-noreturn"))
warn_missing_noreturn = 0;
else if (!strcmp (p, "-Wmissing-format-attribute"))
warn_missing_format_attribute = 1;
else if (!strcmp (p, "-Wno-missing-format-attribute"))
warn_missing_format_attribute = 0;
else if (!strcmp (p, "-Wpointer-arith"))
warn_pointer_arith = 1;
else if (!strcmp (p, "-Wno-pointer-arith"))
warn_pointer_arith = 0;
else if (!strcmp (p, "-Wstrict-prototypes"))
warn_strict_prototypes = 1;
else if (!strcmp (p, "-Wno-strict-prototypes"))
warn_strict_prototypes = 0;
else if (!strcmp (p, "-Wmissing-prototypes"))
warn_missing_prototypes = 1;
else if (!strcmp (p, "-Wno-missing-prototypes"))
warn_missing_prototypes = 0;
else if (!strcmp (p, "-Wmissing-declarations"))
warn_missing_declarations = 1;
else if (!strcmp (p, "-Wno-missing-declarations"))
warn_missing_declarations = 0;
else if (!strcmp (p, "-Wredundant-decls"))
warn_redundant_decls = 1;
else if (!strcmp (p, "-Wno-redundant-decls"))
warn_redundant_decls = 0;
else if (!strcmp (p, "-Wnested-externs"))
warn_nested_externs = 1;
else if (!strcmp (p, "-Wno-nested-externs"))
warn_nested_externs = 0;
else if (!strcmp (p, "-Wtraditional"))
warn_traditional = 1;
else if (!strcmp (p, "-Wno-traditional"))
warn_traditional = 0;
else if (!strncmp (p, "-Wformat=", 9))
set_Wformat (atoi (p + 9));
else if (!strcmp (p, "-Wformat"))
set_Wformat (1);
else if (!strcmp (p, "-Wno-format"))
set_Wformat (0);
else if (!strcmp (p, "-Wformat-y2k"))
warn_format_y2k = 1;
else if (!strcmp (p, "-Wno-format-y2k"))
warn_format_y2k = 0;
else if (!strcmp (p, "-Wformat-extra-args"))
warn_format_extra_args = 1;
else if (!strcmp (p, "-Wno-format-extra-args"))
warn_format_extra_args = 0;
else if (!strcmp (p, "-Wformat-nonliteral"))
warn_format_nonliteral = 1;
else if (!strcmp (p, "-Wno-format-nonliteral"))
warn_format_nonliteral = 0;
else if (!strcmp (p, "-Wformat-security"))
warn_format_security = 1;
else if (!strcmp (p, "-Wno-format-security"))
warn_format_security = 0;
else if (!strcmp (p, "-Wchar-subscripts"))
warn_char_subscripts = 1;
else if (!strcmp (p, "-Wno-char-subscripts"))
warn_char_subscripts = 0;
else if (!strcmp (p, "-Wconversion"))
warn_conversion = 1;
else if (!strcmp (p, "-Wno-conversion"))
warn_conversion = 0;
else if (!strcmp (p, "-Wparentheses"))
warn_parentheses = 1;
else if (!strcmp (p, "-Wno-parentheses"))
warn_parentheses = 0;
else if (!strcmp (p, "-Wreturn-type"))
warn_return_type = 1;
else if (!strcmp (p, "-Wno-return-type"))
warn_return_type = 0;
else if (!strcmp (p, "-Wsequence-point"))
warn_sequence_point = 1;
else if (!strcmp (p, "-Wno-sequence-point"))
warn_sequence_point = 0;
else if (!strcmp (p, "-Wcomment"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wno-comment"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wcomments"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wno-comments"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wtrigraphs"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wno-trigraphs"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wundef"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wno-undef"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wimport"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wno-import"))
; /* cpp handles this one. */
else if (!strcmp (p, "-Wmissing-braces"))
warn_missing_braces = 1;
else if (!strcmp (p, "-Wno-missing-braces"))
warn_missing_braces = 0;
else if (!strcmp (p, "-Wmain"))
warn_main = 1;
else if (!strcmp (p, "-Wno-main"))
warn_main = -1;
else if (!strcmp (p, "-Wsign-compare"))
warn_sign_compare = 1;
else if (!strcmp (p, "-Wno-sign-compare"))
warn_sign_compare = 0;
else if (!strcmp (p, "-Wfloat-equal"))
warn_float_equal = 1;
else if (!strcmp (p, "-Wno-float-equal"))
warn_float_equal = 0;
else if (!strcmp (p, "-Wmultichar"))
warn_multichar = 1;
else if (!strcmp (p, "-Wno-multichar"))
warn_multichar = 0;
else if (!strcmp (p, "-Wdiv-by-zero"))
warn_div_by_zero = 1;
else if (!strcmp (p, "-Wno-div-by-zero"))
warn_div_by_zero = 0;
else if (!strcmp (p, "-Wunknown-pragmas"))
/* Set to greater than 1, so that even unknown pragmas in system
headers will be warned about. */
......@@ -777,7 +685,20 @@ c_decode_option (argc, argv)
warn_unknown_pragmas = 1;
}
else
return strings_processed;
{
size_t i;
for (i = 0; i < sizeof (warn_options) / sizeof (warn_options[0]); i++)
if (strncmp (p, "-W", 2) == 0
&& warn_options[i].flag
&& (strcmp (p+2, warn_options[i].option) == 0
|| (strncmp (p+2, "no-", 3) == 0
&& strcmp (p+5, warn_options[i].option) == 0)))
{
*(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
return 1;
}
return strings_processed;
}
return 1;
}
......
gcc/doc/invoke.texi
......@@ -214,7 +214,7 @@ in the following sections.
-w -W -Wall -Waggregate-return @gol
-Wcast-align -Wcast-qual -Wchar-subscripts -Wcomment @gol
-Wconversion -Wno-deprecated-declarations @gol
-Wdisabled-optimization -Wdiv-by-zero -Werror @gol
-Wdisabled-optimization -Wno-div-by-zero -Werror @gol
-Wfloat-equal -Wformat -Wformat=2 @gol
-Wformat-nonliteral -Wformat-security @gol
-Wimplicit -Wimplicit-int @gol
......@@ -224,7 +224,7 @@ in the following sections.
-Wlarger-than-@var{len} -Wlong-long @gol
-Wmain -Wmissing-braces -Wmissing-declarations @gol
-Wmissing-format-attribute -Wmissing-noreturn @gol
-Wmultichar -Wno-format-extra-args -Wno-format-y2k @gol
-Wno-multichar -Wno-format-extra-args -Wno-format-y2k @gol
-Wno-import -Wpacked -Wpadded @gol
-Wparentheses -Wpointer-arith -Wredundant-decls @gol
-Wreturn-type -Wsequence-point -Wshadow @gol
......@@ -2172,35 +2172,6 @@ All of the above @samp{-W} options combined. This enables all the
warnings about constructions that some users consider questionable, and
that are easy to avoid (or modify to prevent the warning), even in
conjunction with macros.
@item -Wdiv-by-zero
@opindex Wno-div-by-zero
@opindex Wdiv-by-zero
Warn about compile-time integer division by zero. This is default. To
inhibit the warning messages, use @option{-Wno-div-by-zero}. Floating
point division by zero is not warned about, as it can be a legitimate
way of obtaining infinities and NaNs.
@item -Wmultichar
@opindex Wno-multichar
@opindex Wmultichar
Warn if a multicharacter constant (@samp{'FOOF'}) is used. This is
default. To inhibit the warning messages, use @option{-Wno-multichar}.
Usually they indicate a typo in the user's code, as they have
implementation-defined values, and should not be used in portable code.
@item -Wsystem-headers
@opindex Wsystem-headers
@cindex warnings from system headers
@cindex system headers, warnings from
Print warning messages for constructs found in system header files.
Warnings from system headers are normally suppressed, on the assumption
that they usually do not indicate real problems and would only make the
compiler output harder to read. Using this command line option tells
GCC to emit warnings from system headers as if they occurred in user
code. However, note that using @option{-Wall} in conjunction with this
option will @emph{not} warn about unknown pragmas in system
headers---for that, @option{-Wunknown-pragmas} must also be used.
@end table
The following @option{-W@dots{}} options are not implied by @option{-Wall}.
......@@ -2289,6 +2260,26 @@ struct s x = @{ 3, 4 @};
@end smallexample
@end itemize
@item -Wno-div-by-zero
@opindex Wno-div-by-zero
@opindex Wdiv-by-zero
Do not warn about compile-time integer division by zero. Floating point
division by zero is not warned about, as it can be a legitimate way of
obtaining infinities and NaNs.
@item -Wsystem-headers
@opindex Wsystem-headers
@cindex warnings from system headers
@cindex system headers, warnings from
Print warning messages for constructs found in system header files.
Warnings from system headers are normally suppressed, on the assumption
that they usually do not indicate real problems and would only make the
compiler output harder to read. Using this command line option tells
GCC to emit warnings from system headers as if they occurred in user
code. However, note that using @option{-Wall} in conjunction with this
option will @emph{not} warn about unknown pragmas in system
headers---for that, @option{-Wunknown-pragmas} must also be used.
@item -Wfloat-equal
@opindex Wfloat-equal
Warn if floating point values are used in equality comparisons.
......@@ -2505,6 +2496,13 @@ case, and some functions for which @code{format} attributes are
appropriate may not be detected. This option has no effect unless
@option{-Wformat} is enabled (possibly by @option{-Wall}).
@item -Wno-multichar
@opindex Wno-multichar
@opindex Wmultichar
Do not warn if a multicharacter constant (@samp{'FOOF'}) is used.
Usually they indicate a typo in the user's code, as they have
implementation-defined values, and should not be used in portable code.
@item -Wno-deprecated-declarations
@opindex Wno-deprecated-declarations
Do not warn about uses of functions, variables, and types marked as
......
gcc/toplev.c
......@@ -1231,7 +1231,6 @@ documented_lang_options[] =
{ "-Wbad-function-cast",
N_("Warn about casting functions to incompatible types") },
{ "-Wno-bad-function-cast", "" },
{ "-Wno-missing-noreturn", "" },
{ "-Wmissing-format-attribute",
N_("Warn about functions which might be candidates for format attributes") },
{ "-Wno-missing-format-attribute", "" },
......@@ -1250,12 +1249,15 @@ documented_lang_options[] =
{ "-Wconversion",
N_("Warn about possibly confusing type conversions") },
{ "-Wno-conversion", "" },
{ "-Wdiv-by-zero", "" },
{ "-Wno-div-by-zero",
N_("Do not warn about compile-time integer division by zero") },
{ "-Wfloat-equal",
N_("Warn about testing equality of floating point numbers") },
{ "-Wno-float-equal", "" },
{ "-Wformat",
N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
{ "-Wno-format", "" },
{ "-Wformat-y2k", "" },
{ "-Wno-format-y2k",
N_("Don't warn about strftime formats yielding 2 digit years") },
{ "-Wformat-extra-args", "" },
{ "-Wno-format-extra-args",
N_("Don't warn about too many arguments to format functions") },
......@@ -1265,6 +1267,9 @@ documented_lang_options[] =
{ "-Wformat-security",
N_("Warn about possible security problems with format functions") },
{ "-Wno-format-security", "" },
{ "-Wformat-y2k", "" },
{ "-Wno-format-y2k",
N_("Don't warn about strftime formats yielding 2 digit years") },
{ "-Wimplicit-function-declaration",
N_("Warn about implicit function declarations") },
{ "-Wno-implicit-function-declaration", "" },
......@@ -1301,24 +1306,21 @@ documented_lang_options[] =
{ "-Wparentheses",
N_("Warn about possible missing parentheses") },
{ "-Wno-parentheses", "" },
{ "-Wsequence-point",
N_("Warn about possible violations of sequence point rules") },
{ "-Wno-sequence-point", "" },
{ "-Wpointer-arith",
N_("Warn about function pointer arithmetic") },
{ "-Wno-pointer-arith", "" },
{ "-Wredundant-decls",
N_("Warn about multiple declarations of the same object") },
{ "-Wno-redundant-decls", "" },
{ "-Wreturn-type",
N_("Warn whenever a function's return-type defaults to int") },
{ "-Wno-return-type", "" },
{ "-Wsequence-point",
N_("Warn about possible violations of sequence point rules") },
{ "-Wno-sequence-point", "" },
{ "-Wsign-compare",
N_("Warn about signed/unsigned comparisons") },
{ "-Wno-sign-compare", "" },
{ "-Wfloat-equal",
N_("Warn about testing equality of floating point numbers") },
{ "-Wno-float-equal", "" },
{ "-Wunknown-pragmas",
N_("Warn about unrecognized pragmas") },
{ "-Wno-unknown-pragmas", "" },
{ "-Wstrict-prototypes",
N_("Warn about non-prototyped function decls") },
{ "-Wno-strict-prototypes", "" },
......@@ -1330,6 +1332,9 @@ documented_lang_options[] =
{ "-Wno-trigraphs", "" },
{ "-Wundef", "" },
{ "-Wno-undef", "" },
{ "-Wunknown-pragmas",
N_("Warn about unrecognized pragmas") },
{ "-Wno-unknown-pragmas", "" },
{ "-Wwrite-strings",
N_("Mark strings as 'const char *'") },
{ "-Wno-write-strings", "" },
......
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