Older versions of OS X (at least Leopard) are missing some
declarations of C99 functions from <math.h>, which causes our
configure test to decide that all C99 functions are missing from
<math.h>. Rather then splitting up the check into dozens of smaller
checks for individual functions (which would be stage 1 material) this
just adds a special case for the six missing functions, so that darwin
checks for them separately and defaines a new macro to say they're
missing.
PR libstdc++/79017
* acinclude.m4 (GLIBCXX_CHECK_C99_TR1): Check for llrint and llround
functions separately on darwin and if they're missing define
_GLIBCXX_NO_C99_ROUNDING_FUNCS.
* config.h.in: Regenerate.
* configure: Regenerate.
* include/c_global/cmath [_GLIBCXX_NO_C99_ROUNDING_FUNCS] (llrint)
(llrintf, llrintl, llround, llroundf, llroundl): Do not define.
Tested x86_64-linux, committed to trunk.
commit 2802004b233a381e67afee0d9fc4b83712bc7b56
Author: Jonathan Wakely <jwak...@redhat.com>
Date: Mon Jan 9 15:22:03 2017 +0000
PR79017 workaround incomplete C99 math on darwin
PR libstdc++/79017
* acinclude.m4 (GLIBCXX_CHECK_C99_TR1): Check for llrint and llround
functions separately on darwin and if they're missing define
_GLIBCXX_NO_C99_ROUNDING_FUNCS.
* config.h.in: Regenerate.
* configure: Regenerate.
* include/c_global/cmath [_GLIBCXX_NO_C99_ROUNDING_FUNCS] (llrint)
(llrintf, llrintl, llround, llroundf, llroundl): Do not define.
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index eef107a..4e04cce 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1890,12 +1890,14 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
lgamma(0.0);
lgammaf(0.0f);
lgammal(0.0l);
+ #ifndef __APPLE__ /* see below */
llrint(0.0);
llrintf(0.0f);
llrintl(0.0l);
llround(0.0);
llroundf(0.0f);
llroundl(0.0l);
+ #endif
log1p(0.0);
log1pf(0.0f);
log1pl(0.0l);
@@ -1954,6 +1956,29 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
[Define if C99 functions or macros in <math.h> should be imported
in <tr1/cmath> in namespace std::tr1.])
+
+ case "${target_os}" in
+ darwin*)
+ AC_MSG_CHECKING([for ISO C99 rounding functions in <math.h>])
+ AC_CACHE_VAL(glibcxx_cv_c99_math_llround, [
+ AC_TRY_COMPILE([#include <math.h>],
+ [llrint(0.0);
+ llrintf(0.0f);
+ llrintl(0.0l);
+ llround(0.0);
+ llroundf(0.0f);
+ llroundl(0.0l);
+ ],
+ [glibcxx_cv_c99_math_llround=yes],
+ [glibcxx_cv_c99_math_llround=no])
+ ])
+ AC_MSG_RESULT($glibcxx_cv_c99_math_llround)
+ ;;
+ esac
+ if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
+ AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
+ [Define if C99 llrint and llround functions are missing from
<math.h>.])
+ fi
fi
# Check for the existence of <inttypes.h> functions (NB: doesn't make
diff --git a/libstdc++-v3/include/c_global/cmath
b/libstdc++-v3/include/c_global/cmath
index 3630a5b..6e7508f 100644
--- a/libstdc++-v3/include/c_global/cmath
+++ b/libstdc++-v3/include/c_global/cmath
@@ -1012,12 +1012,14 @@ _GLIBCXX_END_NAMESPACE_VERSION
#undef lgamma
#undef lgammaf
#undef lgammal
+#ifndef _GLIBCXX_NO_C99_ROUNDING_FUNCS
#undef llrint
#undef llrintf
#undef llrintl
#undef llround
#undef llroundf
#undef llroundl
+#endif
#undef log1p
#undef log1pf
#undef log1pl
@@ -1143,6 +1145,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using ::lgammaf;
using ::lgammal;
+#ifndef _GLIBCXX_NO_C99_ROUNDING_FUNCS
using ::llrint;
using ::llrintf;
using ::llrintl;
@@ -1150,6 +1153,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using ::llround;
using ::llroundf;
using ::llroundl;
+#endif
using ::log1p;
using ::log1pf;
