From 99913cad315d5eda5e8bb53aa325e5e4220734dd Mon Sep 17 00:00:00 2001 From: Brian Gaeke Date: Tue, 22 Jun 2004 23:42:49 +0000 Subject: [PATCH] Implement isnan check (AC_FUNC_ISNAN) in terms of three calls to a fairly generic macro AC_SINGLE_CXX_CHECK. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14334 91177308-0d34-0410-b5e6-96231b3b80d8 --- autoconf/acinclude.m4 | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/autoconf/acinclude.m4 b/autoconf/acinclude.m4 index ff8a82966df..364ecca5086 100644 --- a/autoconf/acinclude.m4 +++ b/autoconf/acinclude.m4 @@ -6251,3 +6251,34 @@ AC_DEFUN([AC_LINK_USE_R], AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.]) fi ]) + + +dnl AC_SINGLE_CXX_CHECK(DEFINEVAR, CACHEVAR, FUNCTION, HEADER, PROGRAM) +dnl $1, $2, $3, $4, $5 +dnl +AC_DEFUN([AC_SINGLE_CXX_CHECK], +[AC_CACHE_CHECK([for $3 in $4], [$2], + [AC_LANG_PUSH(C++) + AC_COMPILE_IFELSE(AC_LANG_SOURCE([$5]),[$2=yes],[$2=no]) + AC_LANG_POP(C++)]) + if test "$$2" = "yes" + then + AC_DEFINE($1, 1, [Define to 1 if your compiler defines $3 in the $4 + header file.]) + fi]) + +AC_DEFUN([AC_FUNC_ISNAN],[ +AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_MATH_H], [ac_cv_func_isnan_in_math_h], + [isnan], [], + [#include + int foo(float f) {return isnan(f);}]) +AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_CMATH], [ac_cv_func_isnan_in_cmath], + [isnan], [], + [#include + int foo(float f) {return isnan(f);}]) +AC_SINGLE_CXX_CHECK([HAVE_STD_ISNAN_IN_CMATH], [ac_cv_func_std_isnan_in_cmath], + [std::isnan], [], + [#include + using std::isnan; int foo(float f) {return isnan(f);}]) +]) + -- 2.34.1