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Fix build with GNU libstdc++ C++11 ABI

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The GNU libstdc++ that ships witch gcc 5 can be used with the same ABI as
older versions, or with a new ABI which is conformant to the C++11 standard.
LyX did not build if the latter was used:
https://kojipkgs.fedoraproject.org//work/tasks/1267/9651267/build.log

This is now fixed by detecting the ABI version and disabling the wrong forward
declarations. At the same time, STD_STRING_USES_COW is switched off for the
C++11 ABI version, because the std::basic_string implementation is now C++11
conformant. Since the GNU libstdc++ can also used by other compilers such as
clang, we must not test for the compiler version.
This commit is contained in:
Georg Baum 2015-05-08 21:12:42 +02:00
parent da548dbe30
commit 51cc8aa9f6
4 changed files with 48 additions and 4 deletions
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21
config/lyxinclude.m4
View File

@ -159,6 +159,20 @@ 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_TRY_COMPILE([#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])
@ -166,10 +180,15 @@ AC_REQUIRE([AC_PROG_CXXCPP])
AC_LANG_PUSH(C++)
LYX_PROG_CLANG
LYX_LIB_STDCXX
LYX_LIB_STDCXX_CXX11_ABI
AC_LANG_POP(C++)
if test $lyx_cv_lib_stdcxx = "yes" ; then
AC_DEFINE(STD_STRING_USES_COW, 1, [std::string uses copy-on-write])
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++])

23
development/cmake/ConfigureChecks.cmake
View File

@ -137,7 +137,20 @@ check_cxx_source_compiles(
return(0);
}
"
STD_STRING_USES_COW)
lyx_cv_lib_stdcxx)
# Check whether STL is libstdc++ with C++11 ABI
check_cxx_source_compiles(
"
#include <vector>
int main() {
#if ! defined(_GLIBCXX_USE_CXX11_ABI) || ! _GLIBCXX_USE_CXX11_ABI
this is not libstdc++ using the C++11 ABI
#endif
return(0);
}
"
USE_GLIBCXX_CXX11_ABI)
check_cxx_source_compiles(
"
@ -151,7 +164,13 @@ check_cxx_source_compiles(
lyx_cv_prog_clang)
set(USE_LLVM_LIBCPP)
if(NOT STD_STRING_USES_COW)
set(STD_STRING_USES_COW)
set(USE_GLIBCXX_CXX11_ABI)
if(lyx_cv_lib_stdcxx)
if(NOT USE_GLIBCXX_CXX11_ABI)
set(STD_STRING_USES_COW 1)
endif()
else()
if(lyx_cv_prog_clang)
# use libc++ provided by llvm instead of GNU libstdc++
set(USE_LLVM_LIBCPP 1)

3
development/cmake/config.h.cmake
View File

@ -65,6 +65,9 @@
// use libc++ provided by llvm instead of GNU libstdc++
#cmakedefine USE_LLVM_LIBCPP 1
// use GNU libstdc++ with C++11 ABI
#cmakedefine USE_GLIBCXX_CXX11_ABI 1
#cmakedefine Z_PREFIX 1
${Include_used_spellchecker}

5
src/support/strfwd.h
View File

@ -29,7 +29,10 @@ namespace lyx { typedef boost::uint32_t char_type; }
#endif
// Forward definitions do not work with libc++
#ifdef USE_LLVM_LIBCPP
// For gcc5 with the new std::string ABI forward declarations would work in
// principle, but I am not sure whether we want non-standard
// "namespace __cxx11" in our sources.
#if defined(USE_LLVM_LIBCPP) || defined(USE_GLIBCXX_CXX11_ABI)
#include <string>
#else