[LLVMbugs] [Bug 8346] New: clang under windows/mingw inserts visible standard library functions into object files

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8346

           Summary: clang under windows/mingw inserts visible standard
                    library functions into object files
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ambrop7 at gmail.com
                CC: llvmbugs at cs.uiuc.edu


> clang -O2 -c x.c
> clang -O2 -c y.c
> clang -o a.exe x.o y.o  (or gcc)
y.o:fake:(.text+0x0): multiple definition of `strncasecmp'
x.o:fake:(.text+0x0): first defined here
y.o:fake:(.text+0x10): multiple definition of `strcasecmp'
x.o:fake:(.text+0x10): first defined here
collect2: ld returned 1 exit status
clang: error: linker (via gcc) command failed with exit code 1 (use -v to see
in
vocation)

How I set up clang:

Downloaded a 32-bit compiler from http://mingw-w64.sourceforge.net/ which I
unpacked to c:\\mingw.

Installed clang with:
> set PATH=%PATH%;c:\mingw\bin
> cmake ..\llvm -G "MinGW Makefiles" -DC_INCLUDE_DIRS=C:\\mingw\\i686-w64-mingw32\\include
> mingw32-make install

Did this before running the above clang commands:
> set PATH=%PATH%;c:\mingw\bin;C:\Program Files\LLVM\bin

Also made the following change to llvm to get it to compile:

--- lib/System/Win32/DynamicLibrary.inc (revision 116150)
+++ lib/System/Win32/DynamicLibrary.inc (working copy)
@@ -49,13 +49,11 @@

 extern "C" {
 // Use old callback if:
-//  - Not using Visual Studio
 //  - Visual Studio 2005 or earlier but only if we are not using the Windows
SDK
 //    or Windows SDK version is older than 6.0
-// Use new callback if:
-//  - Newer Visual Studio (comes with newer SDK).
-//  - Visual Studio 2005 with Windows SDK 6.0+
-#if !defined(_MSC_VER) || _MSC_VER < 1500 && (!defined(VER_PRODUCTBUILD) ||
VER_PRODUCTBUILD < 6000)
+//  - W32Api older than 3.12
+#if (defined(_MSC_VER) && _MSC_VER < 1500 && (!defined(VER_PRODUCTBUILD) ||
VER_PRODUCTBUILD < 6000)) || \
+    (defined(__W32API_VERSION) && (__W32API_MAJOR_VERSION < 3 ||
(__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION < 12)))
   static BOOL CALLBACK ELM_Callback(PSTR  ModuleName,
                                     ModuleBaseType ModuleBase,
                                     ULONG ModuleSize,

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