reassign 688357 libc6-dev retitle 688357 sys/cdefs.h #defines __attribute__ to nothing without __GNUC__ kthxbye
This is not actually a bug in clang, but a bug in eglibc. In sys/cdefs.h, __attribute__ is #defined to nothing if __GNUC__ is not set. However, there are other compilers that support this syntax, such as clang and the Intel compiler. clang #defines __GNUC__ to 4 by default, but this is buggy because it is not fully compatible with GCC (see 653256). Therefore, when using clang -U__GNUC__, my __attribute__ statements get defined to nothing, and things break. eglibc should not do this if __clang__ is defined, because clang does support these extensions. You might want to consider supporting the Intel compiler as well, although I don't much care if you decide not to. A testcase is attached. If you remove the #include and preprocess the code with -U__GNUC__, the attribute stays. If you don't, the attribute magically disappears. -- brian m. carlson / brian with sandals: Houston, Texas, US +1 832 623 2791 | http://www.crustytoothpaste.net/~bmc | My opinion only OpenPGP: RSA v4 4096b: 88AC E9B2 9196 305B A994 7552 F1BA 225C 0223 B187
#define DREW_SYM_PUBLIC __attribute__((visibility("default")))
#include <features.h>
DREW_SYM_PUBLIC
int foo(int x)
{
return x;
}
signature.asc
Description: Digital signature
