Error when compiling with C libs

Oct 13, 2024

barbosso

Oct 13, 2024

Sergey

Oct 13, 2024

Oct 13, 2024

Oct 13, 2024

Oct 15, 2024

Oct 15, 2024

On Sunday, 13 October 2024 at 13:49:49 UTC, barbosso wrote:

I can compile tilengine examples with clang, but with ldc I get this error.
Please explain the problem.

ldc -betterC -gcc=clang -release -O3 -L-s -flto=full -Xcc=-I./Tilengine/include -L-L./Tilengine/build -L-l:libTilengine.a -L-lSDL2 -L-lpng -L-lm -L-lz tilengine_main.d

/usr/include/bits/floatn-common.h(214): Error: illegal combination of type specifiers
/usr/include/bits/floatn-common.h(251): Error: illegal combination of type specifiers
/usr/include/bits/floatn-common.h(268): Error: illegal combination of type specifiers
/usr/include/bits/floatn-common.h(285): Error: illegal combination of type specifiers
/usr/include/bits/floatn-common.h(285): Error: illegal type combination

error in line
typedef float _Float32;
clang can compile that line,
but dmd or ldc can not!
This is definatly compiler error!

October 15, 2024

Re: Error when compiling with C libs

Posted by barbosso
in reply to Sergey

Permalink

barbosso

Posted in reply to Sergey

Permalink

On Sunday, 13 October 2024 at 21:28:41 UTC, Sergey wrote:

On Sunday, 13 October 2024 at 20:06:44 UTC, barbosso wrote:

error in line
typedef float _Float32;
clang can compile that line,
but dmd or ldc can not!
This is definatly compiler error!

It is not an error..
This is just lack in the implementation.

https://github.com/dlang/dmd/blob/f5fa64a8863e08673cf78a608d28b88e8df832f2/druntime/src/importc.h#L175

Somehow it is working on macOS - aarch64, and not working on Linux 864

I found possible solution
This error occure with inclusion of "/usr/include/bits/floatn-common.h" system lib
to prevent error you can define GNUC to be greater than 7
(for example - comment definition)

//lib.c
#define GNUC 8
#include <bits/floatn-common.h>
//

clang -c lib.c # compile OK
dmd -c lib.c # compile OK with WARNING
lib.c:1:9: warning: 'GNUC' macro redefined [-Wmacro-redefined]
1 | #define GNUC 8
| ^
<built-in>:7:9: note: previous definition is here
7 | #define GNUC 4
|

On Sunday, 13 October 2024 at 21:28:41 UTC, Sergey wrote: > On Sunday, 13 October 2024 at 20:06:44 UTC, barbosso wrote: >> error in line >> ```typedef float _Float32;``` >> clang can compile that line, >> but dmd or ldc can not! >> This is definatly compiler error! > > It is not an error.. > This is just lack in the implementation. > > https://github.com/dlang/dmd/blob/f5fa64a8863e08673cf78a608d28b88e8df832f2/druntime/src/importc.h#L175 > > Somehow it is working on macOS - aarch64, and not working on Linux 864 I found possible solution This error occure with inclusion of "/usr/include/bits/floatn-common.h" system lib to prevent error you can define __GNUC__ to be greater than 7 (for example - comment definition) //lib.c #define __GNUC__ 8 #include <bits/floatn-common.h> // clang -c lib.c # compile OK dmd -c lib.c # compile OK with WARNING lib.c:1:9: warning: '__GNUC__' macro redefined [-Wmacro-redefined] 1 | #define __GNUC__ 8 | ^ <built-in>:7:9: note: previous definition is here 7 | #define __GNUC__ 4 |

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