diff options
Diffstat (limited to 'libstdc++-v3/acinclude.m4')
| -rw-r--r-- | libstdc++-v3/acinclude.m4 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4 index 0ce3b8b5b31..84b12adbc24 100644 --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -1200,6 +1200,43 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [ requires corresponding C99 library functions to be present.]) fi + # Check for the existence of <complex.h> complex inverse trigonometric + # math functions used by <complex> for C++11 and later. + ac_c99_complex_arc=no; + if test x"$ac_has_complex_h" = x"yes"; then + AC_MSG_CHECKING([for ISO C99 support for inverse trig functions in <complex.h>]) + AC_TRY_COMPILE([#include <complex.h>], + [typedef __complex__ float float_type; float_type tmpf; + cacosf(tmpf); + casinf(tmpf); + catanf(tmpf); + cacoshf(tmpf); + casinhf(tmpf); + catanhf(tmpf); + typedef __complex__ double double_type; double_type tmpd; + cacos(tmpd); + casin(tmpd); + catan(tmpd); + cacosh(tmpd); + casinh(tmpd); + catanh(tmpd); + typedef __complex__ long double ld_type; ld_type tmpld; + cacosl(tmpld); + casinl(tmpld); + catanl(tmpld); + cacoshl(tmpld); + casinhl(tmpld); + catanhl(tmpld); + ],[ac_c99_complex_arc=yes], [ac_c99_complex_arc=no]) + fi + AC_MSG_RESULT($ac_c99_complex_arc) + if test x"$ac_c99_complex_arc" = x"yes"; then + AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_ARC, 1, + [Define if C99 inverse trig functions in <complex.h> should be + used in <complex>. Using compiler builtins for these functions + requires corresponding C99 library functions to be present.]) + fi + # Check for the existence in <stdio.h> of vscanf, et. al. AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++11], glibcxx_cv_c99_stdio_cxx11, [ |