http://llvm.org/bugs/show_bug.cgi?id=9854
Summary: <cmath> undefs symbols from the global namespace
Product: libc++
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
$ cat test.cc
#include <math.h>
void foo(double works) {
isnan(works);
}
#include <cmath>
void bar(double doesnt) {
isnan(doesnt);
}
$ clang++ -stdlib=libc++ -c test.cc
test.cc:10:5: error: use of undeclared identifier 'isnan'
isnan(doesnt);
^
1 error generated.
This is basically the same issue as http://gcc.gnu.org/PR14608.
[depr.c.headers] says that <math.h> puts the <cmath> names into the global
namespace, and it doesn't allow a later include of <cmath> to take them back
out. [depr.c.headers] also allows <cmath> to 'using' its declarations and
definitions into the global namespace, which is what I'd propose as a fix.
One twist is that glibc's <math.h> defines at least isnan and isinf as
functions in the global namespace rather than just macros, so you can't simply
add that using declaration on all platforms.
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