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For instance, bitwise negation of a boolean is very likely a bug in the program. template auto forward(T t) -> decltype (realfn (t)) { return realfn (t); } void f() { forward({1,2}); // call forward> }This option is present because this deduction is an If n is 0 (the default), there is no limit on the number of error messages produced. switch (cond) { case 1: bar (0); /* FALLTHRU */ default: ... } This warning is enabled by -Wextra. -Wignored-qualifiers (C and C++ only)Warn if the return type of a function this contact form

At level 2, the call in the example above is again diagnosed, but this time because with a equal to a 32-bit INT_MIN the first %i directive will write some of Unrecognized input files, not requiring compilation or assembly, are ignored. -S Stop after the stage of compilation proper; do not assemble. GCC also warns about function definitions that might be candidates for format attributes. For example, prog.c: In function `main': indicates that the error was encountered in the program file prog.c, and specifically in function main. other

Gcc Option

Friend functions were documented to work this way in the old Annotated C ++ Reference Manual, and versions of G++ before 4.1 always worked that way. If that fails, the [email protected] mailing list might help. Combining several classes is possible, although this usually restricts the output by so much that there is nothing to display. Two important fatal run time errors are discussed below: Floating exception (core dumped) This is caused by a division by zero in your program.

This option can be used to suppress such a warning. -Wno-incompatible-pointer-types (C and Objective-C only)Do not warn when there is a conversion between pointers that have incompatible types. Why is that? –photonist Oct 19 '14 at 21:19 | show 6 more comments Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign within a file if they are static, or unique if they are used between object files) Be careful if using extern statements in source files to declare prototypes. G++ For example, warn if a call to a function returning an integer type is cast to a pointer type. -Wc90-c99-compat (C and Objective-C only)Warn about features not present in ISO C90,

The formats are checked against the format features supported by GNU libc version 2.2. Fpermissive The only difference between -Wswitch and this option is that this option gives a warning about an omitted enumeration code even if there is a default label. -Wswitch-boolWarn whenever a switch Xstormy16 Options -msim Xtensa Options -mconst16 -mno-const16 -mfused-madd -mno-fused-madd -mserialize-volatile -mno-serialize-volatile -mtext-section-literals -mno-text-section-literals -mtarget-align -mno-target-align -mlongcalls -mno-longcalls zSeries Options See S/390 and zSeries Options. https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html In new code it is better to use -fvisibility=hidden and export those classes which are intended to be externally visible.

This switch takes a negative form, to be used to negate -Werror for specific warnings; for example -Wno-error=switch makes -Wswitch warnings not be errors, even when -Werror is in effect. Make For example, warn if a char * is cast to an int * on machines where integers can only be accessed at two- or four-byte boundaries. -Wwrite-stringsWhen compiling C, give string How should I deal with a difficult group and a DM that doesn't help? In C++ enumeral mismatches in conditional expressions are also diagnosed and the warning is enabled by default.

Fpermissive

Warnings about conversions between signed and unsigned integers can be disabled by using -Wno-sign-conversion. In C++, warn if a non-static reference or non-static const member appears in a class without constructors. Gcc Option Bondy 198k82474572 1 I think that #pragma only works in VC++, not in gcc. Unrecognized Command Line Option Description When you invoke GCC , it normally does preprocessing, compilation, assembly and linking.

This option also warns when a non-volatile automatic variable might be changed by a call to longjmp. Chebyshev Rotation Appease Your Google Overlords: Draw the "G" Logo Why does argv include the program name? You can specify the input language explicitly with the -x option: -x language Specify explicitly the language for the following input files (rather than letting the compiler choose a default based All of our lists have public archives. Gcc Error Unrecognized Command Line Option

You have called the function XXXXX. Thus this warning depends on the optimization level. share|improve this answer answered Jul 28 '11 at 14:29 Daniel 4,19841842 3 No. Specifying this option disables that optimization, and forces G++ to call the copy constructor in all cases. -fno-enforce-eh-specs Don't generate code to check for violation of exception specifications at runtime.

Word with the largest number of different phonetic vowel sounds IQ Puzzle with no pattern Animal Shelter in Java How much is "a ladleful"? -std=c++11 This warning is more effective with link time optimization, where the information about the class hierarchy graph is more complete. -Wsuggest-final-methodsWarn about virtual methods where code quality would be improved if For example, to compile a source which initializes a char array of 300,000 elements requires more than 60MB(!) of memory.

This is equivalent to -fno-freestanding. -ffreestanding Assert that compilation takes place in a freestanding environment.

Bondy share|improve this answer answered Apr 2 '09 at 7:09 Andrew Edgecombe 22k32455 add a comment| up vote 6 down vote You are probably including a header file twice. A function body may only have at most one non-inline definition in the whole program. General compile-time error and warning description In C, a compilation error is usually fatal, meaning that the C compiler cannot compile the source code. In the following example, the initializer for a is not fully bracketed, but that for b is fully bracketed.

This warning is enabled by -Wall. -Wswitch-defaultWarn whenever a switch statement does not have a default case. -Wswitch-enumWarn whenever a switch statement has an index of enumerated type and lacks a How much interest should I pay on a loan from a friend? In C99 mode (-std=c99 or -std=gnu99), this switch only affects the "asm" and "typeof" keywords, since "inline" is a standard keyword in ISO C99. -fno-builtin -fno-builtin-function Don't recognize built-in functions that GCC Bugzilla – Bug43126 "at this point in file" warnings are upside down Last modified: 2010-06-02 06:53:53 UTC Home | New | Browse | Search | [?] | Reports | Help

This option is currently only supported when compiling C or C ++ .