<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang seems to silently ignore the weak attribute (mingw)"
href="https://llvm.org/bugs/show_bug.cgi?id=23136">23136</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang seems to silently ignore the weak attribute (mingw)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows XP
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>t.poechtrager@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat test.cpp
#include <malloc.h>
#include <stdlib.h>
#include <stddef.h>
#ifdef WEAK
#undef WEAK
#define WEAK __attribute__((weak))
#else
#define WEAK
#endif
WEAK void *operator new(size_t size) throw()
{
void *p = malloc(size);
if(!p) abort();
return p;
}
WEAK void *operator new[](size_t size) throw()
{
void *p = malloc(size);
if(!p) abort();
return p;
}
WEAK void operator delete(void *p) throw() { if(p) free(p); }
WEAK void operator delete(void *p, size_t) throw() { if(p) free(p); }
WEAK void operator delete[](void *p) throw() { if(p) free(p); }
WEAK void operator delete[](void *p, size_t) throw() { if(p) free(p); }
WEAK int main()
{
new char[100];
}
$ i686-w64-mingw32-clang++ test.cpp -Weverything -Wno-missing-prototypes -c -o
1.o
$ i686-w64-mingw32-clang++ test.cpp -Weverything -Wno-missing-prototypes -c -o
2.o -DWEAK
$ LC_ALL=C i686-w64-mingw32-clang++ 1.o 2.o
2.o:(.text+0x0): multiple definition of `operator new(unsigned int)'
1.o:(.text+0x0): first defined here
2.o:(.text+0x40): multiple definition of `operator new[](unsigned int)'
1.o:(.text+0x40): first defined here
2.o:(.text+0x80): multiple definition of `operator delete(void*)'
1.o:(.text+0x80): first defined here
2.o:(.text+0xb0): multiple definition of `operator delete(void*, unsigned int)'
1.o:(.text+0xb0): first defined here
2.o:(.text+0xe0): multiple definition of `operator delete[](void*)'
1.o:(.text+0xe0): first defined here
2.o:(.text+0x110): multiple definition of `operator delete[](void*, unsigned
int)'
1.o:(.text+0x110): first defined here
2.o:(.text+0x140): multiple definition of `main'
1.o:(.text+0x140): first defined here
collect2: error: ld returned 1 exit status
clang-3.7: error: linker (via gcc) command failed with exit code 1 (use -v to
see invocation)
mingw-g++ handles this correctly:
$ i686-w64-mingw32-g++ test.cpp -c -o 1.o
$ i686-w64-mingw32-g++ test.cpp -c -o 2.o -DWEAK
$ LC_ALL=C i686-w64-mingw32-g++ 1.o 2.o && echo $?
0</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>