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Make it possible to select C++ standard with autoconf
Introduce new configure option --enable-cxx-mode=MODE, which allows to force a C++ version. The default is {14,11}, which means that C++14 is chosen if it is supported, and C++11 will be selected as a fallback. Using --enable-cxx-mode=11 ensures that LyX compiles correctly with an older C++11 compiler.
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4
INSTALL
4
INSTALL
@ -208,6 +208,10 @@ The following options allow you to tweak the generated code more
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precisely (see the description of --enable-build-type for the default
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values):
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o --enable-cxx-mode=VALUE can be used to select a C++ standard, for
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example --enable-cxx-mode=11. The default is to try C++14, and then
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C++11.
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o --enable-optimization=VALUE enables you to set optimization to a
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higher level than the default, for example --enable-optimization=-O3.
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@ -165,11 +165,15 @@ fi
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dnl Usage: LYX_CXX_CXX11_FLAGS: add to AM_CXXFLAGS the best flag that
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selects C++11 mode; gives an error when C++11 mode is not found.
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dnl selects C++11 mode; gives an error when C++11 mode is not found.
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dnl Parameter is a list of years to try (e.g. 11 or {14,11})
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AC_DEFUN([LYX_CXX_CXX11_FLAGS],
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[AC_CACHE_CHECK([for at least C++11 mode], [lyx_cv_cxx11_flags],
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[AC_CACHE_CHECK([for a good C++ mode], [lyx_cv_cxx11_flags],
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[lyx_cv_cxx11_flags=none
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for flag in -std=c++14 -std=c++11 "" -std=gnu++14 -std=gnu++11 ; do
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for flag in `eval echo -std=c++$1 default -std=gnu++$1` ; do
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if test $flag = default ; then
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flag=
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fi
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save_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$AM_CPPFLAGS $CPPFLAGS"
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save_CXXFLAGS=$CXXFLAGS
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@ -202,8 +206,8 @@ AC_DEFUN([LYX_CXX_CXX11_FLAGS],
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CXXFLAGS=$save_CXXFLAGS
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CPPFLAGS=$save_CPPFLAGS
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done])
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if test $lyx_cv_cxx11_flags = none ; then
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AC_MSG_ERROR([Cannot find suitable C++11 mode for compiler $CXX])
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if test x$lyx_cv_cxx11_flags = xnone ; then
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AC_MSG_ERROR([Cannot find suitable mode for compiler $CXX])
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fi
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AM_CXXFLAGS="$lyx_cv_cxx11_flags $AM_CXXFLAGS"
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])
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@ -304,9 +308,15 @@ AC_DEFUN([LYX_PROG_CXX],
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[AC_REQUIRE([AC_PROG_CXX])
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AC_REQUIRE([AC_PROG_CXXCPP])
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### We might want to disable debug
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AC_ARG_ENABLE(cxx-mode,
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AS_HELP_STRING([--enable-cxx-mode],[choose C++ standard (default: 14, then 11)]),,
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[enable_cxx_mode=14,11]
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)
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AC_LANG_PUSH(C++)
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LYX_PROG_CLANG
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LYX_CXX_CXX11_FLAGS
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LYX_CXX_CXX11_FLAGS($enable_cxx_mode)
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LYX_LIB_STDCXX
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LYX_LIB_STDCXX_CXX11_ABI
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LYX_CXX_USE_REGEX
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