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Use C++11 by default when possible
Compiler that are known to support C++11 (gcc >= 4.3 and clang) are now used in this mode by default. It is still possible to override this choice using --(en|dis)able-cxx11. Moreover, c++11 mode is detected from the compiler itself, not from the use of --enable-cxx11. This allows to support compilers other than gcc or clang. Update INSTALL file accordingly and clean it a little bit.
This commit is contained in:
Jean-Marc Lasgouttes
parent
211ac35314
commit
893ae612e4
23
INSTALL
23
INSTALL
@ -48,7 +48,9 @@ Requirements
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------------
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First of all, you will need a recent C++ compiler, where recent means
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that the compilers are close to C++ standard conforming (gcc 4.x).
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that the compilers are close to C++ standard conforming like gcc (at
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least 4.x) or clang. Note that the compiler will be used in C++11 mode
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when possible.
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LyX makes great use of the C++ Standard Template Library (STL).
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This means that gcc users will have to install the relevant libstdc++
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@ -76,10 +78,6 @@ compile LyX with up-to-date translations (at least gettext version
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The two following programs should be available at configuration time:
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o LaTeX2e should be correctly setup for the user you are logged in
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as. Otherwise, LyX will not be able to run a number of tests. Note
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that users can run these tests manually with Tools>Reconfigure.
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o Python 2.7 must be installed. Python is used for many simple tasks
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that are executed by external scripts, such as the automatic
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configuration step and the import of older LyX documents with the
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@ -113,7 +111,7 @@ flags:
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debug X X X X
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The defaults are as follows in terms of version number
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release: stable release (1.x.y)
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release: stable release (2.x.y)
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prerelease: version number contains alpha, beta, rc or pre.
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development: version number contains dev.
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@ -209,6 +207,9 @@ The following options allow you to tweak the generated code more precisely (see
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optimization of LyX. The compile may be much quicker with some
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compilers, but LyX will run more slowly.
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o --disable-cxx11 forces the compiler in C++98 mode. The default is
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to use C++11 mode for known good compilers.
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o --enable-debug will add debug information to your binary. This
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requires a lot more disk space, but is a must if you want to try
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to debug problems in LyX. There is no run-time penalty.
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@ -227,11 +228,6 @@ The following options allow you to tweak the generated code more precisely (see
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o --enable-concept-checks adds some compile-time checks. There is no
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run-time penalty.
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o --without-latex-config that disables the automatic detection of your
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latex configuration. This detection is automatically disabled if
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latex cannot be found. If you find that you have to use this
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flag, please report it as a bug.
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o --enable-monolithic-build[=boost,client,insets,mathed,core,tex2lyx,frontend-qt4]
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that enables monolithic build of the given parts of the source
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code. This should reduce the compilation time provided you have
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@ -254,8 +250,9 @@ to strip the lyx binary. In this case replace "make install" with
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make install-strip
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BTW: in the images subdirectory there is also a small icon "lyx.png",
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that can be used to display lyx-documents in filemanagers.
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BTW: in the lib/images subdirectory there is also small icons
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`lyx.png' and `lyx.svg', that can be used to display LyX documents in
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filemanagers.
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If configure fails for some strange reason
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------------------------------------------
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@ -133,7 +133,7 @@ done
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])dnl
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dnl Usage: LYX_PROG_CLANG: set lyx_cv_prog_clang to yes if the compiler is clang.
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dnl Usage: LYX_PROG_CLANG: set CLANG to yes if the compiler is clang.
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AC_DEFUN([LYX_PROG_CLANG],
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[AC_CACHE_CHECK([whether the compiler is clang],
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[lyx_cv_prog_clang],
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@ -146,6 +146,26 @@ AC_DEFUN([LYX_PROG_CLANG],
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])
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dnl Usage: LYX_CXX_CXX11: set lyx_use_cxx11 to yes if the compiler implements
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dnl the C++11 standard.
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AC_DEFUN([LYX_CXX_CXX11],
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[AC_CACHE_CHECK([whether the compiler implements C++11],
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[lyx_cv_cxx_cxx11],
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[save_CXXFLAGS=$CXXFLAGS
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CXXFLAGS="$AM_CXXFLAGS $CXXFLAGS"
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AC_LANG_PUSH(C++)
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AC_TRY_COMPILE([], [
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#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
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this is a c++11 compiler
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#endif
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],
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[lyx_cv_cxx_cxx11=no], [lyx_cv_cxx_cxx11=yes ; lyx_flags="$lyx_flags c++11"])
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AC_LANG_POP(C++)
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CXXFLAGS=$save_CXXFLAGS])
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lyx_use_cxx11=$lyx_cv_cxx_cxx11
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])
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dnl Usage: LYX_LIB_STDCXX: set lyx_cv_lib_stdcxx to yes if the STL library is libstdc++.
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AC_DEFUN([LYX_LIB_STDCXX],
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[AC_CACHE_CHECK([whether STL is libstdc++],
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@ -159,14 +179,6 @@ AC_DEFUN([LYX_LIB_STDCXX],
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])
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dnl Usage: LYX_CXX_USE_CXX11(STD): pass option -std=STD to the C++ compiler
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dnl and update lyxflags
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AC_DEFUN([LYX_CXX_USE_CXX11],
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[lyx_flags="$lyx_flags c++11"
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AM_CXXFLAGS="$AM_CXXFLAGS -std=$1"
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])
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dnl Usage: LYX_LIB_STDCXX_CXX11_ABI: set lyx_cv_lib_stdcxx_cxx11_abi to yes
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dnl if the STL library is GNU libstdc++ and the C++11 ABI is used.
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AC_DEFUN([LYX_LIB_STDCXX_CXX11_ABI],
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@ -257,8 +269,8 @@ AC_ARG_ENABLE(pch,
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lyx_pch_comp=no
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AC_ARG_ENABLE(cxx11,
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AC_HELP_STRING([--enable-cxx11],[enable C++11 mode]),,
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enable_cxx11=no;)
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AC_HELP_STRING([--enable-cxx11],[enable C++11 mode (default: enabled for known good compilers)]),,
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enable_cxx11=auto;)
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AC_ARG_ENABLE(assertions,
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AC_HELP_STRING([--enable-assertions],[add runtime sanity checks in the program]),,
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@ -333,35 +345,42 @@ if test x$GXX = xyes; then
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;;
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esac
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fi
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if test x$enable_cxx11 = xyes ; then
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dnl enable_cxx11 can be yes/no/auto.
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dnl By default, it is auto and we enable C++11 when possible
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if test x$enable_cxx11 != xno ; then
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case $gxx_version in
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4.0*|4.1*|4.2*) AC_ERROR([There is no C++11 support in gcc 4.2 or older]);;
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4.0*|4.1*|4.2*)
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if x$enable_cxx11 = xyes; then
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AC_ERROR([There is no C++11 support in gcc 4.2 or older])
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fi;;
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4.3*|4.4*|4.5*|4.6*)
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dnl Note that this will define __GXX_EXPERIMENTAL_CXX0X__.
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dnl The source code relies on that.
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LYX_CXX_USE_CXX11(c++0x);;
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AM_CXXFLAGS="$AM_CXXFLAGS -std=c++0x";;
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clang)
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dnl presumably all clang version support c++11.
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dnl the deprecated-register warning is very annoying with Qt4.x right now.
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LYX_CXX_USE_CXX11(c++11 -Wno-deprecated-register);;
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AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11 -Wno-deprecated-register";;
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*)
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LYX_CXX_USE_CXX11(c++11);;
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AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11";;
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esac
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fi
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LYX_CXX_CXX11
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if test $lyx_use_cxx11 = yes ; then
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if test x$CLANG = xno || test $lyx_cv_lib_stdcxx = yes; then
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dnl <regex> in gcc is unusable in versions less than 4.9.0
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dnl see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53631
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case $gxx_version in
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4.0*|4.1*|4.2*|4.3*|4.4*|4.5*|4.6*|4.7*|4.8*) ;;
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*) lyx_flags="$lyx_flags stdregex"
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lyx_std_regex=yes
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;;
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*) lyx_std_regex=yes ;;
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esac
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else
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lyx_flags="$lyx_flags stdregex"
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lyx_std_regex=yes
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fi
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if test $lyx_std_regex = yes ; then
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lyx_flags="$lyx_flags stdregex"
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AC_DEFINE([LYX_USE_STD_REGEX], 1, [define to 1 if std::regex should be preferred to boost::regex])
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fi
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fi
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