Hi everyone,

This week, it was a pretty tough time with duplicate symbol of global redeclarations.

I took my time to understand how redeclaration were handled in dsymbolsem.
had to come up with a solution that finds an already exisiting symbol and then removes it
from module's members. it worked for that but broke other tests which were hard to trace.

later decided to handle it in the backend because I realized LDC didn't have that problem.
even if you redeclare C symbols globally, LDC merges them into one in the symbol table.

so I had to fix a identifier check before we emit symbols. Apparently, it worked.
no symbol duplications but the global symbol access seems to break initializer reads on x86 targets but works super fine on x86_64 targets. I'm still investigating, pretty sure the 32 bit registers couldn't handle some reads with the lookup I introduced.

can follow up in this PR: https://github.com/dlang/dmd/pull/22003

Thanks!

On Monday, 20 October 2025 at 17:16:00 UTC, Emmanuel wrote:

Hi

Do you know if typedef enum is planned to be enabled in importC?

On Monday, 20 October 2025 at 17:16:00 UTC, Emmanuel wrote:

Thanks again for your work on this.

On Monday, 27 October 2025 at 11:56:10 UTC, Serg Gini wrote:

Hi,

I just tested a simple typedef enum code in a .c file and dmd compiles it for me.

please what have you encountered with it that you want to be fixed?

Thanks!

On Monday, 27 October 2025 at 13:10:29 UTC, Emmanuel wrote:

I have a bigger code where I've tried to apply importC. And it gave me errors regarding several parts of the enum definitions that looked like that in the header:

typedef enum
{
	kColorBlack,
	kColorWhite,
	kColorClear,
	kColorXOR
} LCDSolidColor;

In manually prepared code we've used:

enum LCDSolidColor {
	black,
	white,
	clear,
	xor
}

On Monday, 27 October 2025 at 20:16:31 UTC, Sergey wrote:

typedef enum
{
	kColorBlack,
	kColorWhite,
	kColorClear,
	kColorXOR
} LCDSolidColor;

enum LCDSolidColor {
	black,
	white,
	clear,
	xor
}

Do not forget that enums in C works quite different than in C++. D's enum is much more akin to C++'s enum class.

A conversion of a C enum into D, would have actually done:

enum {
  kColorBlack,
  kColorWhite,
  kColorClear,
  kColorXOR
}

On Monday, 27 October 2025 at 20:16:31 UTC, Sergey wrote:

typedef enum
{
	kColorBlack,
	kColorWhite,
	kColorClear,
	kColorXOR
} LCDSolidColor;

enum LCDSolidColor {
	black,
	white,
	clear,
	xor
}

Hi,

Please can you open an issue with a complete use and test case and the error message.

And let me know. I can look at it for you as soon as possible.

Thanks!