diff options
Diffstat (limited to 'libstdc++-v3/acinclude.m4')
| -rw-r--r-- | libstdc++-v3/acinclude.m4 | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4 index 4e2b169..981fc92 100644 --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -1098,7 +1098,8 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [ AC_MSG_CHECKING([for ISO C99 support to TR1 in <ctype.h>]) AC_CACHE_VAL(ac_c99_ctype_tr1, [ AC_TRY_COMPILE([#include <ctype.h>], - [isblank(0); + [int ch; + isblank(ch); ],[ac_c99_ctype_tr1=yes], [ac_c99_ctype_tr1=no]) ]) AC_MSG_RESULT($ac_c99_ctype_tr1) @@ -1108,6 +1109,35 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [ <tr1/cctype> in namespace std::tr1.]) fi + # Check for the existence of <fenv.h> functions. + AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no) + ac_c99_fenv_tr1=no; + if test x"$ac_has_fenv_h" = x"yes"; then + AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>]) + AC_TRY_COMPILE([#include <fenv.h>], + [int except, mode; + fexcept_t* pflag; + fenv_t* penv; + feclearexcept(except); + fegetexceptflag(pflag, except); + feraiseexcept(except); + fesetexceptflag(pflag, except); + fetestexcept(except); + fegetround(); + fesetround(mode); + fegetenv(penv); + feholdexcept(penv); + fesetenv(penv); + feupdateenv(penv); + ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no]) + fi + AC_MSG_RESULT($ac_c99_fenv_tr1) + if test x"$ac_c99_fenv_tr1" = x"yes"; then + AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1, + [Define if C99 functions in <fenv.h> should be imported in + <tr1/cfenv> in namespace std::tr1.]) + fi + AC_LANG_RESTORE ]) |