Corinna Vinschen wrote:
On Mar 13 09:13, Csaba Raduly wrote:
Hi
On Thu, Mar 12, 2015 at 10:55 AM, Duncan Roe wrote:
On Wed, Mar 11, 2015 at 06:55:16PM -0400, Vlad Gheorghiu wrote:
The following code fails to compile under latest cygwin, Windows 7,
g++4.9.2. Compiled with g++ -std=c++11 test.cpp. The compiler
complains that std::log2 is not a member of std.
#include <cmath>
#include <iostream>
int main()
{
auto x = std::log2(10);
std::cout << x << std::endl;
}
Verbatim error:
g++ -std=c++11 test.cpp
test.cpp: In function 'int main()':
test.cpp:5:11: error: 'log2' is not a member of 'std'
auto x = std::log2(10);
^
test.cpp:5:11: note: suggested alternative:
In file included from
/usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/cmath:44:0,
from test.cpp:1:
/usr/include/math.h:305:15: note: ???log2???
extern double log2 _PARAMS((double));
FWIW, this program works fine under Linux / gcc4.8.2:
ISTR a discussion about some C++11 features being configured away due
to Cygwin's lack of some C library functions ("to_string not a member
of std"): https://sourceware.org/ml/cygwin/2015-01/msg00245.html
Your issue may be related (I'm guessing here because I don't have
Cygwin at hand right now).
I guess the same. The problem is probably related to the fact that
newlib is still missing most of the long double functions (cosl, sinl,
etc). The libstdc++ configury seems to activate the related std methods
only if *all* related C library functions for double, float and long
double (e.g. cos, cosf, cosl) are implemented by the platform.
Yes. The attached patch for cmath include file would fix this.
Christian
--- /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/cmath.orig 2015-02-24 02:02:20.000000000 +0100
+++ /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/cmath 2015-03-13 09:39:58.098696700 +0100
@@ -922,7 +922,7 @@ _GLIBCXX_END_NAMESPACE_VERSION
#if __cplusplus >= 201103L
-#ifdef _GLIBCXX_USE_C99_MATH_TR1
+#if defined(_GLIBCXX_USE_C99_MATH_TR1) || defined(__CYGWIN__)
#undef acosh
#undef acoshf
@@ -1041,87 +1041,66 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// functions
using ::acosh;
using ::acoshf;
- using ::acoshl;
using ::asinh;
using ::asinhf;
- using ::asinhl;
using ::atanh;
using ::atanhf;
- using ::atanhl;
using ::cbrt;
using ::cbrtf;
- using ::cbrtl;
using ::copysign;
using ::copysignf;
- using ::copysignl;
using ::erf;
using ::erff;
- using ::erfl;
using ::erfc;
using ::erfcf;
- using ::erfcl;
using ::exp2;
using ::exp2f;
- using ::exp2l;
using ::expm1;
using ::expm1f;
- using ::expm1l;
using ::fdim;
using ::fdimf;
- using ::fdiml;
using ::fma;
using ::fmaf;
- using ::fmal;
using ::fmax;
using ::fmaxf;
- using ::fmaxl;
using ::fmin;
using ::fminf;
- using ::fminl;
using ::hypot;
using ::hypotf;
- using ::hypotl;
using ::ilogb;
using ::ilogbf;
- using ::ilogbl;
using ::lgamma;
using ::lgammaf;
- using ::lgammal;
using ::llrint;
using ::llrintf;
- using ::llrintl;
using ::llround;
using ::llroundf;
- using ::llroundl;
using ::log1p;
using ::log1pf;
- using ::log1pl;
using ::log2;
using ::log2f;
- using ::log2l;
using ::logb;
using ::logbf;
- using ::logbl;
using ::lrint;
using ::lrintf;
@@ -1129,31 +1108,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using ::lround;
using ::lroundf;
- using ::lroundl;
using ::nan;
using ::nanf;
- using ::nanl;
using ::nearbyint;
using ::nearbyintf;
- using ::nearbyintl;
using ::nextafter;
using ::nextafterf;
- using ::nextafterl;
-
- using ::nexttoward;
- using ::nexttowardf;
- using ::nexttowardl;
using ::remainder;
using ::remainderf;
- using ::remainderl;
using ::remquo;
using ::remquof;
- using ::remquol;
using ::rint;
using ::rintf;
@@ -1161,23 +1130,56 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using ::round;
using ::roundf;
- using ::roundl;
using ::scalbln;
using ::scalblnf;
- using ::scalblnl;
using ::scalbn;
using ::scalbnf;
- using ::scalbnl;
using ::tgamma;
using ::tgammaf;
- using ::tgammal;
using ::trunc;
using ::truncf;
+
+#ifndef __CYGWIN__
+ using ::acoshl;
+ using ::asinhl;
+ using ::atanhl;
+ using ::cbrtl;
+ using ::copysignl;
+ using ::erfl;
+ using ::erfcl;
+ using ::exp2l;
+ using ::expm1l;
+ using ::fdiml;
+ using ::fmal;
+ using ::fmaxl;
+ using ::fminl;
+ using ::hypotl;
+ using ::ilogbl;
+ using ::lgammal;
+ using ::llrintl;
+ using ::llroundl;
+ using ::log1pl;
+ using ::log2l;
+ using ::logbl;
+ using ::lroundl;
+ using ::nanl;
+ using ::nearbyintl;
+ using ::nextafterl;
+ using ::nexttoward;
+ using ::nexttowardf;
+ using ::nexttowardl;
+ using ::remainderl;
+ using ::remquol;
+ using ::roundl;
+ using ::scalblnl;
+ using ::scalbnl;
+ using ::tgammal;
using ::truncl;
+#endif
/// Additional overloads.
constexpr float
--
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