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C compilers can have GNU extensions to support typeof in C code, but some C++ compilers like clang are removing the builtin since decltype can be used in C++ without the constraints from typeof. Decltype is not 100% equivalent for this reason: references will be kept in the returned type. The check in m4/typeof.m4 comes from graydon/monotone and dovecot/core and was slightly modified to namespace the define for C++ code.
21 lines
575 B
Plaintext
21 lines
575 B
Plaintext
dnl @synopsis AX_CXX_TYPEOF
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dnl
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dnl tests for the presence of the gcc hashmap stl extension
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dnl
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dnl @author Patrick Mauritz <oxygene@studentenbude.ath.cx>
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dnl @version 2005-08-15
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dnl @license AllPermissive
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AC_DEFUN([AX_CXX_TYPEOF],[
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AC_LANG_ASSERT([C++])
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AC_CACHE_CHECK(whether the C++ compiler supports typeof,
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ac_cv_cxx_typeof,
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ int x; typeof (x) y[6]; ]])],
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[ac_cv_cxx_typeof=yes],
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[ac_cv_cxx_typeof=no])
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])
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if test "$ac_cv_cxx_typeof" = yes; then
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AC_DEFINE(HAVE_CXX_TYPEOF, 1, [Define if the compiler supports typeof.])
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fi
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])
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