Error when compiling with C libs

Oct 13

barbosso

Oct 13

Sergey

Oct 13

Oct 13

Oct 13

Oct 15

Oct 15

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

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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