[cfe-dev] clang doesn't compile simple code

[fprijate]

Hi

Here is simple example and the description of the problem.

--- main.c ----

#include <stdio.h>
#include "dll.h"

int main(void)
{   
    hello("World");
    return 0;
}

---- dll.h -------------

#ifndef DLL_H
#define DLL_H

#ifdef BUILDING_DLL
#define MY_DLL  __declspec(dllexport)
#else
#define MY_DLL __declspec(dllimport)
#endif

void  MY_DLL hello(const char *s);
#endif

---- dll.c -------------

#include <stdio.h>
#include "dll.h"

void hello(const char *s)
{
   printf("Hello %s\n", s);
}

---- build.bat -----

clang -c   -DBUILDING_DLL dll.c
clang -shared -o dll.dll dll.o -Wl,--out-implib,libdll.a 

clang -c main.c
clang -o main.exe main.o -L. -ldll

-----------------------------------
Error:
Cannot export _hello: symbol not found
D:\mingw-builds\x32-4.8.1-posix-dwarf\mingw32\bin\ld.exe: warning: cannot
find entry symbol  DllMainCRTStartup; defaulting to 623c1000
clang.exe: error: linker command failed with exit code 1 (use -v to see
invocation)

If i compile with gcc  everything is OK
gcc -c   -DBUILDING_DLL dll.c
gcc -shared -o dll.dll dll.o -Wl,--out-implib,libdll.a 

gcc -c main.c
gcc -o main.exe main.o -L. -ldll

I can even create libdll with gcc and rest with clang and everything is OK.
gcc -c   -DBUILDING_DLL dll.c
gcc -shared -o dll.dll dll.o -Wl,--out-implib,libdll.a 

clang -c main.c
clang -o main.exe main.o -L. -ldll

So there is no problem with __declspec(dllimport).

The problem is in wrong COFF produced with: clang -c   -DBUILDING_DLL dll.c
Or in other words  problem lies __declspec(dllexport).

regards
Franček









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