Bug 22496 – importC: Error: illegal combination of type specifiers

Created attachment 1833 Source file I'm trying to compile I ran the original source file through the gcc preprocessor and got the attached fsign_d.c file. It compiles with gcc: gcc -c fsign_d.c but when using dmd: dmd -c fsign_d.c /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(316): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/x86_64-linux-gnu/bits/mathcalls.h(322): Error: illegal combination of type specifiers /usr/include/string.h(43): Error: found `__dest` when expecting `,` /usr/include/string.h(43): Error: found `__src` when expecting `,`

Created attachment 1834 Source file without that error

If I comment out all single lines that are just __extension__ as in the second uploaded file, that error goes away. Now I get dmd -c fsign_d2.c /usr/include/string.h(43): Error: found `__dest` when expecting `,` /usr/include/string.h(43): Error: found `__src` when expecting `,` /usr/include/string.h(54): Error: found `__dest` when expecting `,` /usr/include/string.h(54): Error: found `__src` when expecting `,` /usr/include/string.h(122): Error: found `__dest` when expecting `,` /usr/include/string.h(122): Error: found `__src` when expecting `,` /usr/include/string.h(125): Error: found `__dest` when expecting `,` /usr/include/string.h(126): Error: found `__src` when expecting `,` /usr/include/string.h(130): Error: found `__dest` when expecting `,` /usr/include/string.h(130): Error: found `__src` when expecting `,` /usr/include/string.h(133): Error: found `__dest` when expecting `,` /usr/include/string.h(133): Error: found `__src` when expecting `,` /usr/include/string.h(147): Error: found `__dest` when expecting `,` /usr/include/string.h(148): Error: found `__src` when expecting `,` /usr/include/string.h(336): Error: found `__s` when expecting `,` /usr/include/string.h(336): Error: found `__delim` when expecting `,` /usr/include/string.h(341): Error: found `__s` when expecting `,` /usr/include/string.h(342): Error: found `__delim` when expecting `,` /usr/include/string.h(343): Error: found `__save_ptr` when expecting `,` /usr/include/string.h(346): Error: found `__s` when expecting `,`

Most of the remaining errors are due to dmd choking on restricted pointers. Anything with char *__restrict causes an error.

Created attachment 1835 Commented file that compiles

I attached a file that compiles with dmd. I had to comment out anything with: - `__extension__` - Restricted pointers `*__restrict` - `_Float128` - `__asm__` And in the source, anything with ISNAN, or in the preprocessed file, - `__builtin_isnan`

This is not a bug. Everything was a result of GCC extensions, which are not supported by ImportC, so there's no reason to leave it open.

Why is this closed? LDC can handle the _restricted keyword, DMD not. I'm currently using ImportC instead of handcrafted bindings, but actually I can't use DMD, when using the GCC -E option.

For everyone ending up here, due to this bug: Using 'gcc -D_WCHAR_H -E -o output.i input.{c|h}' fixed the problem for me, as it prevents 'wchar.h' to be included, which contained the problematic special keywords of GCC. Of course, this will only work, if you do not need wchar features in your imported C sources.

I closed it because it turned out to not be a bug. It's not wrong behavior because GCC extensions are not supported. They're supposed to be working on handling GCC extensions, so if this is still a problem once they release that support, that would really be a different issue anyway.