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Fix the logic of selection of std::regex
This amends commit e1938aa2, which introduced some logic
errors: regex would be enabled for gcc versions which have unusable
<regex> header.
The new code separates better special gcc handling from special C++11
handling and should be more readable.
* set -std=c++11 in AM_CPPFLAGS instead of AM_CXXFLAGS, since the
preprocessor uses this setting too.
* Before checking for header <regex>, set language to C++ and update
value of AM_CPPFLAGS too.
* Separate code that checks for regex in its own macro.
* now unknown compiler which have the <regex> header, will use std::regex in C++11 mode.
This commit is contained in:
Jean-Marc Lasgouttes
parent
2f8444b120
commit
39717adfda
@ -151,7 +151,9 @@ 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=$CXXFLAGS
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[save_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$AM_CPPFLAGS $CPPFLAGS"
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save_CXXFLAGS=$CXXFLAGS
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CXXFLAGS="$AM_CXXFLAGS $CXXFLAGS"
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AC_LANG_PUSH(C++)
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AC_TRY_COMPILE([], [
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@ -161,10 +163,46 @@ AC_DEFUN([LYX_CXX_CXX11],
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],
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[lyx_cv_cxx_cxx11=no], [lyx_cv_cxx_cxx11=yes ; lyx_flags="$lyx_flags c++11"])
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AC_LANG_POP(C++)
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CXXFLAGS=$save_CXXFLAGS])
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CXXFLAGS=$save_CXXFLAGS
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CPPFLAGS=$save_CPPFLAGS])
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lyx_use_cxx11=$lyx_cv_cxx_cxx11
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])
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dnl decide whether we want to use std::regex and set the
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dnl LYX_USE_STD_REGEX accordingly.
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AC_DEFUN([LYX_CXX_USE_REGEX],
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[lyx_std_regex=no
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if test $lyx_use_cxx11 = yes; then
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save_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$AM_CPPFLAGS $CPPFLAGS"
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save_CXXFLAGS=$CXXFLAGS
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CXXFLAGS="$AM_CXXFLAGS $CXXFLAGS"
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AC_LANG_PUSH(C++)
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AC_CHECK_HEADER([regex], [lyx_std_regex=yes], [lyx_std_regex=no])
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AC_LANG_POP(C++)
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CXXFLAGS=$save_CXXFLAGS
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CPPFLAGS=$save_CPPFLAGS
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if test x$GXX = xyes && test $lyx_std_regex = yes ; then
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AC_MSG_CHECKING([for correct regex implementation])
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if test x$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 $gxx_version in
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4.0*|4.1*|4.2*|4.3*|4.4*|4.5*|4.6*|4.7*|4.8*) lyx_std_regex=no ;;
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*) ;;
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esac
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fi
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fi
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AC_MSG_RESULT([$lyx_std_regex])
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fi
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if test $lyx_std_regex = yes ; then
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lyx_flags="$lyx_flags std-regex"
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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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AM_CONDITIONAL([LYX_USE_STD_REGEX], test $lyx_std_regex = yes)
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])
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dnl Usage: LYX_LIB_STDCXX: set lyx_cv_lib_stdcxx to yes if the STL library is libstdc++.
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AC_DEFUN([LYX_LIB_STDCXX],
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@ -270,7 +308,6 @@ if test "x$enable_assertions" = xyes ; then
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fi
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# set the compiler options correctly.
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lyx_std_regex=no
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if test x$GXX = xyes; then
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dnl clang++ pretends to be g++ 4.2.1; this is not useful
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if test x$CLANG = xno; then
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@ -325,46 +362,29 @@ if test x$GXX = xyes; then
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4.3*|4.4*|4.5*|4.6*)
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dnl Note that this will define __GXX_EXPERIMENTAL_CXX0X__.
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dnl The source code relies on that.
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AM_CXXFLAGS="$AM_CXXFLAGS -std=c++0x";;
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AM_CPPFLAGS="$AM_CPPFLAGS -std=c++0x";;
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clang)
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dnl presumably all clang versions support c++11.
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dnl the deprecated-register warning is very annoying with Qt4.x right now.
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AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11 -Wno-deprecated-register";;
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AM_CPPFLAGS="$AM_CPPFLAGS -std=c++11"
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AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-register";;
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*)
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AS_CASE([$host], [*cygwin*],
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[AM_CXXFLAGS="$AM_CXXFLAGS -std=gnu++11"],
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[AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11"]);;
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[AM_CPPFLAGS="$AM_CPPFLAGS -std=gnu++11"],
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[AM_CPPFLAGS="$AM_CPPFLAGS -std=c++11"]);;
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esac
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fi
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fi
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LYX_CXX_CXX11
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if test $lyx_use_cxx11 = yes; then
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if test x$GXX = xyes; then
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dnl We still use auto_ptr, which is obsoleted. Shut off the warnings.
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AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-declarations"
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AC_CHECK_HEADER([regex], [lyx_std_regex=yes], [lyx_std_regex=no])
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if test x$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_std_regex=yes ;;
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esac
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else
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lyx_std_regex=yes
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fi
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fi
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else
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dnl This is not gcc, not sure what setup we can do
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AC_CHECK_HEADER([regex], [lyx_std_regex=yes], [lyx_std_regex=no])
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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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AM_CONDITIONAL([LYX_USE_STD_REGEX], test $lyx_std_regex = yes)
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])dnl
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LYX_CXX_USE_REGEX
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])
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dnl Usage: LYX_USE_INCLUDED_BOOST : select if the included boost should
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dnl be used.
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