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libstdc++/1822: math function conflicts
- To: gcc-gnats at gcc dot gnu dot org
- Subject: libstdc++/1822: math function conflicts
- From: snyder at fnal dot gov
- Date: Wed, 31 Jan 2001 13:16:06 -0600
- Reply-To: snyder at fnal dot gov
>Number: 1822
>Category: libstdc++
>Synopsis: math function conflicts
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Wed Jan 31 11:26:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: scott snyder
>Release: 2.97 20010129 (experimental)
>Organization:
>Environment:
System: Linux karma 2.2.16-22 #1 Tue Aug 22 16:49:06 EDT 2000 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../egcs/configure --prefix=/usr/local/egcs --enable-threads=posix
>Description:
For the following source
-------------------------------------------------
#include <cmath>
#include <math.h>
double mag(double x) { return sqrt(x); }
using std::sqrt;
-------------------------------------------------
gcc gives the error
$ g++ -c y.cc
y.cc:6: `double std::sqrt(double)' conflicts with used function
/usr/include/bits/mathcalls.h:146: `double sqrt(double)' previously declared
here
Oddly, this error goes away if the definition of the mag() function
is removed. It also goes away if we use `std::sqrt' instead of `sqrt'
in the body of mag().
>How-To-Repeat:
See above.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: