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New test to determine correct -std option for CXX compiler

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The test file is stolen from cmake. The options tested are, from the
most desirable to the least desirable:
  -std=c++14 -std=c++11 "" -std=c++0x -std=gnu++14 -std=gnu++11 -std=gnu++0x

It is expected that the result will not be correct for cygwin, but
this is fixable.
This commit is contained in:
Jean-Marc Lasgouttes 2016-07-06 14:03:22 +02:00
parent b874bdfd40
commit 23dbcb59d2
1 changed files with 56 additions and 40 deletions
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84
config/lyxinclude.m4
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@ -160,26 +160,53 @@ fi
])
dnl Usage: LYX_CXX_CXX11: set lyx_use_cxx11 to yes if the compiler implements
dnl the C++11 standard.
AC_DEFUN([LYX_CXX_CXX11],
[AC_CACHE_CHECK([whether the compiler implements C++11],
[lyx_cv_cxx_cxx11],
[save_CPPFLAGS=$CPPFLAGS
dnl Usage: LYX_CXX_CXX11_FLAGS: add to AM_CXXFLAGS the best flag that
selects C++11 mode; gives an error when C++11 mode is not found.
AC_DEFUN([LYX_CXX_CXX11_FLAGS],
[AC_CACHE_CHECK([for at least C++11 mode], [lyx_cv_cxx11_flags],
[lyx_cv_cxx11_flags=none
for flag in -std=c++14 -std=c++11 "" -std=c++0x -std=gnu++14 -std=gnu++11 -std=gnu++0x ; do
save_CPPFLAGS=$CPPFLAGS
CPPFLAGS="$AM_CPPFLAGS $CPPFLAGS"
save_CXXFLAGS=$CXXFLAGS
CXXFLAGS="$AM_CXXFLAGS $CXXFLAGS"
CXXFLAGS="$flag $AM_CXXFLAGS $CXXFLAGS"
AC_LANG_PUSH(C++)
AC_TRY_COMPILE([], [
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
this is a c++11 compiler
#endif
],
[lyx_cv_cxx_cxx11=no], [lyx_cv_cxx_cxx11=yes ; lyx_flags="$lyx_flags c++11"])
dnl sample openmp source code to test
AC_TRY_COMPILE([
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
class TestDeleted
{
public:
TestDeleted() = delete;
};
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = static_cast<check_type&&>(c);
auto d = a;],
[return 0;],
[lyx_cv_cxx11_flags=$flag; break])
AC_LANG_POP(C++)
CXXFLAGS=$save_CXXFLAGS
CPPFLAGS=$save_CPPFLAGS])
lyx_use_cxx11=$lyx_cv_cxx_cxx11
CPPFLAGS=$save_CPPFLAGS
done])
if test $lyx_cv_cxx11_flags = none ; then
AC_ERROR([Cannot find suitable C++11 mode for compiler $CXX])
fi
lyx_cxx11_flags=$lyx_cv_cxx11_flags
AM_CXXFLAGS="$lyx_cxx11_flags $AM_CXXFLAGS"
])
@ -369,35 +396,24 @@ if test x$GXX = xyes; then
;;
esac
fi
fi
LYX_CXX_CXX11_FLAGS
# Some additional flags may be needed
if test x$GXX = xyes; then
case $gxx_version in
4.6*)
dnl Note that this will define __GXX_EXPERIMENTAL_CXX0X__.
dnl The source code relies on that.
cxx11_flags="-std=gnu++0x";;
4.7*|4.8*|4.9*|5.*)
cxx11_flags="-std=gnu++11";;
clang-3.0*|clang-3.1*|clang-3.2*|clang-3.3*)
dnl presumably all clang versions support c++11.
dnl boost contains pragmas that are annoying on older clang versions
cxx11_flags="-std=c++11 -Wno-unknown-pragmas";;
AM_CPPFLAGS="-Wno-unknown-pragmas $AM_CPPFLAGS";;
clang*)
dnl the more recent versions support the deprecated-register warning,
dnl which is very annoying with Qt4.x right now.
cxx11_flags="-std=c++11"
AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-register";;
*) # gcc 6 and newer use C++14 as default
;;
esac
# cxx11_flags is useful when running preprocessor alone
# (see detection of regex).
AM_CXXFLAGS="$cxx11_flags $AM_CXXFLAGS"
fi
LYX_CXX_CXX11
if test $lyx_use_cxx11 = no; then
AC_ERROR([A C++11 compatible compiler is required])
fi
LYX_CXX_USE_REGEX([$cxx11_flags])
LYX_CXX_USE_REGEX([$lyx_cxx11_flags])
])
dnl Usage: LYX_USE_INCLUDED_BOOST : select if the included boost should