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Tagged with compiler-errors c
2,230 questions
1
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1
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112
views
error: impossible constraint in 'asm' with -m32 for an "i" ("string") operand: string address as immediate
I am just wondering why this code:
void test(void) {
asm volatile( "ud2\n\t"
".long " "%c0" "\n\t"
".word %c1\n\t&...
- 35
0
votes
1
answer
54
views
Trying to compile an example X11 program using gcc, failing to find "bitmaps/icon_bitmap"
I'm trying to compile an example program from chapter three of Volume One of the Xlib Programing manual.
I get an error saying that there is no such file or directory for #include "bitmaps/...
- 11
1
vote
1
answer
98
views
"variable-sized object may not be initialized" error message when number of elements are calculated with float
With GCC 11.4 (-std=c99) on Linux WSL, there is an compile error as in example 2) in the code below. I have not gotten this kind of error with other compilers such as TASKING, MULTI, ti-arm-clang.
Do ...
- 31
2
votes
1
answer
63
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Why does this function pointer typedef behave differently when used with const?
#include <stdio.h>
typedef int (*func_t)(int);
int foo(int x) {
return x * 2;
}
int main() {
const func_t ptr = foo; // Works
//const func_t *ptr = &foo; // Fails: why?
...
- 551
1
vote
3
answers
94
views
Why does this macro with a comma operator fail to compile in a switch statement?
#include <stdio.h>
#define PRINT(x) (printf("%d\n", x), x)
int main() {
int a = 1;
switch (a) {
case PRINT(1): puts("Case 1"); break;
case PRINT(2)...
- 551
2
votes
1
answer
92
views
gcc throws compiler errors on every line of ARMv8 assembly function
I am trying to compile the following function:
#include <stdio.h>
extern long long int f(int a, int b);
int main() {
long long int x = f(3, 2);
printf("Value of x = %lld\n", ...
1
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0
answers
48
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My project build is failing to compile with gcc - WinMain issue? [duplicate]
Makefile is not working as expected. Compiling in windows with MSYS2 MinGW 64-bit - LDFLAGS is causing issue and I've tried two options.....
LDFLAGS = -lSDL2 -lncursesw -mconsole
and currently...
...
- 11
3
votes
1
answer
73
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Can I use WASAPI in C code on MinGW64? If so, how?
I am using MinGW64 which has the necessary headers to use WASAPI. However, following the WASAPI programming guide I added following code:
const CLSID CLSID_MMDeviceEnumerator = __uuidof(...
- 283
1
vote
1
answer
62
views
Compilation error: unknown type name 'HardwareSerial'
I need to write a code to send data via UART. I wrote a test code on Arduino IDE in a .ino file and it worked perfectly. Now I trying to shift the code to a .c file. My code is as follows:
#include &...
- 645
1
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0
answers
50
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Can ARMCC generate a warning for implicit conversion?
I am trying to find the armcc equivalent of the gcc option that generate a warning if there is a sign mismatch when passing in integers into a function.
In gcc, these compiler options will generate an ...
- 11
0
votes
1
answer
75
views
gcc complains for infinite recursion while freeing binary tree
I am trying to write a generic free function for a binary tree.
typedef struct s_tree
{
void *content;
struct s_tree *left;
struct s_tree *right;
} t_tree;
void ft_treeclear(...
- 63
0
votes
1
answer
73
views
Condition always false PORTG
I am trying to compile this code and I'm getting a WARNING and an ERROR. I'm using PIC-C Compiler. I'm using a PIC24FJ256GA410. I have an LED at pin G0 and I have a pull-up resistor at pin G13. Why ...
- 11
27
votes
3
answers
5k
views
Is `(expression, lvalue) = rvalue` a valid assignment in C or C++? Why do some compilers accept/reject it?
Some time ago I stumbled upon the idea of how a C construct, such as (expr0, expr1, expr2), evaluates (see "What does the comma operator , do?" for more context).
I've started experimenting ...
- 823
2
votes
0
answers
92
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why does my VSCode exit with code 127 when trying to compile a C file using gcc?
I'm trying to compile a C file using gcc. I'm in the right directory and all the files included in the C file i'm trying to compile is in the same directory. I can compile other files but I can't ...
- 21
0
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2
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94
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compiler complains that an unused variable is used when simply a cast to void is performed
We just found out that a certain compiler (Greenhills) sees the following construct as an error:
// local variable
mytype x;
...
((void) (x));
The compiler reports:
error #549-D: variable "x&...
- 618