Array Type Has Incomplete Element Type

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GCC: Array type has incomplete element type – Stack Overflow

In case of a single dimension array double[] , then this is an incomplete array type but the element type is double , which is a complete type.

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Source: stackoverflow.com

Date Published: 5/17/2021

Gcc Array Type Has Incomplete Element Type

I get an “array type has incomplete element type” message from gcc when I compile it. What have I gotten wrong in how I pass the struct to the function?

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Error message “array type has incomplete element type ‘int …

Error message “array type has incomplete element type ‘int[]'” in C programming. I wrote a function called max that returns the maximum …

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array type has incomplete element type – C Board

array type has incomplete element type. Im down to a deadline and need to solve the problems with this code. When compiling its giving me …

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array type has an incomplete element type – ProgrammerAH

I. Details of the error array type has an incomplete element type. Second, error analysis ·1) Error code: int readInfo(int B[][],int n); int …

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array type has incomplete element type. C / C++ Forums on Bytes.

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array type has incomplete element type struct. struct NUMBER { int num ; }; typedef struct NUMBER ; struct NUMBER array[99999]; // wrong form // should be …

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주제에 대한 기사 평가 array type has incomplete element type

Author: errordog
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Date Published: 2018. 9. 2.
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GCC: Array type has incomplete element type

Posting this in case someone comes across this question and wonder about the formal reasons why [] works and [][] doesn’t, in general. There’s various rules in play: the rules of what makes a valid array declaration and the rules of how arrays passed as parameters to functions “decay” into a pointer to the first element.

C17 6.7.6.2/1 Array declarators:

The element type shall not be an incomplete or function type.

In case of double weight[][] , the element type is double[] , an incomplete (array) type, which isn’t allowed to be declared anywhere, parameter or not. Because this rule of array declaration applies before the rule of “array decay” of function parameters, which is found in C17 6.7.6.3/7 Function declarators:

A declaration of a parameter as ‘‘array of type’’ shall be adjusted to ‘‘qualified pointer to type’’

That rules assumes that we already have a declaration of the array, which would have to be done according the 6.7.6.2 rule previously quoted.

In case of a single dimension array double[] , then this is an incomplete array type but the element type is double , which is a complete type. Such an array declaration is allowed according to C17 6.7.6.2/4:

If the size is not present, the array type is an incomplete type.

Whenever such an array is used with an initializer list, double foo[] = { 1.0f }; then C17 6.7.9/22 states that it is given a size depending on the initializers and turns into a complete type by the end of the declaration:

If an array of unknown size is initialized, its size is determined by the largest indexed element with an explicit initializer. The array type is completed at the end of its initializer list.

If it is not initialized, but simply part of a function parameter list, then the previously mentioned rule of “array decay” applies and double[] gets replaced with double* .

Gcc Array Type Has Incomplete Element Type

Jonathan Leffler answer at 2012-04-04 38

It’s the array that’s causing trouble in:

void print_graph(g_node graph_node[], double weight[][], int nodes);

The second and subsequent dimensions must be given:

void print_graph(g_node graph_node[], double weight[][32], int nodes);

Or you can just give a pointer to pointer:

void print_graph(g_node graph_node[], double **weight, int nodes);

However, although they look similar, those are very different internally.

If you’re using C99, you can use variably-qualified arrays. Quoting an example from the C99 standard (section §6.7.5.2 Array Declarators):

void fvla(int m, int C[m][m]); // valid: VLA with prototype scope

void fvla(int m, int C[m][m]) // valid: adjusted to auto pointer to VLA

{

typedef int VLA[m][m]; // valid: block scope typedef VLA

struct tag {

int (*y)[n]; // invalid: y not ordinary identifier

int z[n]; // invalid: z not ordinary identifier

};

int D[m]; // valid: auto VLA

static int E[m]; // invalid: static block scope VLA

extern int F[m]; // invalid: F has linkage and is VLA

int (*s)[m]; // valid: auto pointer to VLA

extern int (*r)[m]; // invalid: r has linkage and points to VLA

static int (*q)[m] = &B; // valid: q is a static block pointer to VLA

}

Question in comments
[…] In my main(), the variable I am trying to pass into the function is a double array[][] , so how would I pass that into the function? Passing array[0][0] into it gives me incompatible argument type, as does &array and &array[0][0] .

In your main() , the variable should be:

double array[10][20];

or something faintly similar; maybe

double array[][20] = { { 1.0, 0.0, … }, … };

You should be able to pass that with code like this:

typedef struct graph_node

{

int X;

int Y;

int active;

} g_node;

void print_graph(g_node graph_node[], double weight[][20], int nodes);

int main(void)

{

g_node g[10];

double array[10][20];

int n = 10;

print_graph(g, array, n);

return 0;

}

That compiles (to object code) cleanly with GCC 4.2 (i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)) and also with GCC 4.7.0 on Mac OS X 10.7.3 using the command line:

Error message “array type has incomplete element type ‘int[]'” in C programming

You need to replace the code with this one: //print the sum element of each column in 2D Array printf(”

“); for (j=0; j

Code: template

That is C++, not C. You’re in the wrong forum for C++ help if that’s what you need, but the rest looks like C. Did you “borrow” the code from somewhere? Your second error is probably because your prototype doesn’t match the definition.

array type has an incomplete element type

int readInfo(int B[][],int n); int findMax(int B[][],int n,int m);

I. Details of the errorarray type has an incomplete element typeSecond, error analysis·1) Error code:

2) Error reasons:

Void Func(int array[3][10])

void Func(int array[][10])

)

; void Func(int array[][10])

)

void Func(int array[][10])

3) Correction code:

array type has incomplete element type

Hi All,

——————————————————————————–

This is a part of the code :

————————————————————–

extern struct dummy temp[];

error: array type has incomplete element type

————————————————————–

which i compiled without any error on :

$gcc -v

Reading specs from /usr/bin/../lib/gcc-lib/powerpc-ibm-aix5.1.0.0

/2.9-aix51-020209/specs

gcc version 2.9-aix51-020209

but the same code doesnt compile on the :

$gcc -v

Using built-in specs.

Target: powerpc-ibm-aix5.3.0.0

Configured with: ../configure –with-as=/usr/bin/as –with-ld=/usr/

bin/

ld

–disable-nls –enable-languages=c,c++ –prefix=/opt/freeware

–enable-threads –enable-version-specific-runtime-libs

–host=powerpc-ibm-aix5.3.0.0

Thread model: aix

gcc version 4.0.0

Please suggest me the arguments I must give to gcc 4.0 to get the

above code compiled.

Shravan

PS : I have already gone through the article :

.

the code I am compiling is large and it is difficult to change it

now.

Please suggest me something that GCC 4.0 has for backward

compatibility.

array type has incomplete element type struct

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array type has incomplete element type struct

struct NUMBER { int num ; }; typedef struct NUMBER ; struct NUMBER array[99999]; // wrong form // should be written in this form NUMBER array[99999]; // right form
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