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Clean up after removal of strfwd.h

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Remove autoconf tests for whether std::string uses COW, since this is
forbidden by C++11 standard.

Forbid the use of gcc 4.9 (which still uses COW).

Remove code in debug.h that added forward declarations for LLVM's
libc++, since we do not do forward declarations anymore.

Remove configure test for libc++.
This commit is contained in:
Jean-Marc Lasgouttes 2024-10-05 15:04:51 +02:00
parent 1f7e8d3ffe
commit 09684899d6
3 changed files with 4 additions and 43 deletions
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5
INSTALL
View File

@ -52,8 +52,9 @@ You will also probably need GNU m4 (perhaps installed as gm4).
Requirements
------------
First of all, you will need a C++11 standard conforming compiler, like g++ (at
least 5.0, to have proper std::regex & std::string) or clang++.
First of all, you will need a C++11 standard conforming compiler, like
g++ (at least 5.0, to have proper std::regex & std::string) or
clang++.
LyX makes great use of the C++ Standard Library. This means that gcc
users will have to install the relevant libstdc++ library to be able

28
config/lyxinclude.m4
View File

@ -248,19 +248,6 @@ AC_DEFUN([LYX_LIB_STDCXX],
])
dnl Usage: LYX_LIB_STDCXX_CXX11_ABI: set lyx_cv_lib_stdcxx_cxx11_abi to yes
dnl if the STL library is GNU libstdc++ and the C++11 ABI is used.
AC_DEFUN([LYX_LIB_STDCXX_CXX11_ABI],
[AC_CACHE_CHECK([whether STL is libstdc++ using the C++11 ABI],
[lyx_cv_lib_stdcxx_cxx11_abi],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include<vector>]], [[
#if ! defined(_GLIBCXX_USE_CXX11_ABI) || ! _GLIBCXX_USE_CXX11_ABI
this is not libstdc++ using the C++11 ABI
#endif
]])],[lyx_cv_lib_stdcxx_cxx11_abi=yes],[lyx_cv_lib_stdcxx_cxx11_abi=no])])
])
AC_DEFUN([LYX_PROG_CXX],
[AC_REQUIRE([AC_PROG_CXX])
AC_REQUIRE([AC_PROG_CXXCPP])
@ -275,22 +262,9 @@ AC_LANG_PUSH(C++)
LYX_PROG_CLANG
LYX_CXX_CXX11_FLAGS($enable_cxx_mode)
LYX_LIB_STDCXX
LYX_LIB_STDCXX_CXX11_ABI
LYX_CXX_USE_CALL_ONCE
AC_LANG_POP(C++)
if test $lyx_cv_lib_stdcxx = "yes" ; then
if test $lyx_cv_lib_stdcxx_cxx11_abi = "yes" ; then
AC_DEFINE(USE_GLIBCXX_CXX11_ABI, 1, [use GNU libstdc++ with C++11 ABI])
else
AC_DEFINE(STD_STRING_USES_COW, 1, [std::string uses copy-on-write])
fi
else
if test $lyx_cv_prog_clang = "yes" ; then
AC_DEFINE(USE_LLVM_LIBCPP, 1, [use libc++ provided by llvm instead of GNU libstdc++])
fi
fi
### We might want to get or shut warnings.
AC_ARG_ENABLE(warnings,
AS_HELP_STRING([--enable-warnings],[tell the compiler to display more warnings]),,
@ -363,7 +337,7 @@ if test x$GXX = xyes; then
fi
case $gxx_version in
2.*|3.*|4.@<:@0-8@:>@*) AC_MSG_ERROR([gcc >= 4.9 is required]);;
2.*|3.*|4.*) AC_MSG_ERROR([gcc >= 5 is required]);;
esac
AM_CXXFLAGS="$lyx_optim $AM_CXXFLAGS"

14
src/support/debug.h
View File

@ -17,20 +17,6 @@
#include "support/docstring.h"
// Forward definitions do not work with libc++
// but ios_base has already been defined in strfwd
// if compiling with it
#ifndef USE_LLVM_LIBCPP
namespace std {
class ios_base;
template<typename CharT, typename Traits> class basic_streambuf;
typedef basic_streambuf<char, char_traits<char> > streambuf;
} // namespace std
#endif
// Make sure at compile time that sizeof(unsigned long long) >= 8
typedef char p__LINE__[ (sizeof(unsigned long long) > 7) ? 1 : -1];