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Always require C++11 compilation (!117) 

All the oldest supported distributions now have versions of GTK C++
libraries which require C++11 compilation, therefore forcing GParted to
require C++11 compilation [1][2][3].  Fragment of existing ./configure
output which lists the library versions requiring C++11 compilation:

    $ ./configure
    ...
    checking for glibmm >= 2.45.40 which requires C++11 compilation... yes
    checking for libsigc++ >= 2.5.1 which requires C++11 compilation... yes
    checking for gtkmm >= 3.18.0 which requires C++11 compilation... yes
    checking whether g++ supports C++11 features with -std=gnu++11... yes

The oldest supported distributions and their versions of GTK C++
libraries and GCC compiler:

    Distribution        gtkmm    glibmm   libsigc++   gcc

    Debian 10           3.24.0   2.58.0   2.10.1      4.8.3
    RHEL / CentOS 7.9   3.22.2   2.56.0   2.10.0      4.8.5
    SLES 12 SP5         3.20.1   2.48.1   2.8.0       4.8
    Ubuntu 20.04 LTS    3.24.2   2.64.2   2.10.2      9.3.0

Technically GCC didn't have full C++11 support until GCC 4.8.1 [6] and
SLES 12 SP5 only has GCC 4.8 (as well as many later versions of GCC).
However which ever version of the GCC compiler is being used to compile
the GTK C++ libraries it must have all the features needed to compile
those libraries.

Simplify the configure script and just always require a C++11 capable
compiler.  This also allows the use of C++11 features in the GParted
code.

[1] commit cc0740148e
    port-to-gtk3: Switch to Gtkmm3 (#7)
[2] commit 707bae6fed
    Enable C++11 compilation when using libsigc++ 2.5.1 and later (#758545)
[3] commit d6d7cb2bbf
    Enable C++11 compilation when using glibmm 2.45.40 and later (#756035)
[4] SUSE Product Support Lifecycle, SUSE Linux Enterprise Server 12
    https://www.suse.com/lifecycle/#suse-linux-enterprise-server-12
[5] SUSE package search
    https://scc.suse.com/packages?name=SUSE%20Linux%20Enterprise%20Server&version=12.5&arch=x86_64&query=&module=
[6] C++ Standards Support in GCC, C++11 Support in GCC
    https://gcc.gnu.org/projects/cxx-status.html#cxx11

Closes !117 - Require C++11 compilation
This commit is contained in:
Mike Fleetwood 2023-08-30 19:01:40 +01:00 committed by Curtis Gedak
parent 1e548c55a6
commit 9f473b70cb
1 changed files with 2 additions and 32 deletions
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32
configure.ac
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@ -209,38 +209,8 @@ dnl Check for glibmm minimum required version.
PKG_CHECK_MODULES([GLIBMM], [glibmm-2.4 >= 2.32.0])
need_cxx_compile_stdcxx_11=no
dnl Check for glibmm >= 2.45.40 which requires C++11 compilation.
AC_MSG_CHECKING([for glibmm >= 2.45.40 which requires C++11 compilation])
PKG_CHECK_EXISTS(
[glibmm-2.4 >= 2.45.40],
[need_cxx_compile_stdcxx_11=yes
AC_MSG_RESULT([yes])
],
[AC_MSG_RESULT([no])]
)
dnl Check for libsigc++ >= 2.5.1 which requires C++11 compilation.
AC_MSG_CHECKING([for libsigc++ >= 2.5.1 which requires C++11 compilation])
PKG_CHECK_EXISTS(
[sigc++-2.0 >= 2.5.1],
[need_cxx_compile_stdcxx_11=yes
AC_MSG_RESULT([yes])
],
[AC_MSG_RESULT([no])]
)
dnl Check for gtkmm >= 3.18.0 which requires C++11 compilation.
AC_MSG_CHECKING([for gtkmm >= 3.18.0 which requires C++11 compilation])
PKG_CHECK_EXISTS(
[gtkmm-3.0 >= 3.18.0],
[need_cxx_compile_stdcxx_11=yes
AC_MSG_RESULT([yes])
],
[AC_MSG_RESULT([no])]
)
dnl Enable C++11 compilation only if required.
if test "x$need_cxx_compile_stdcxx_11" = xyes; then
dnl Require C++11 compilation.
AX_CXX_COMPILE_STDCXX_11()
fi
dnl Check for gtkmm >= 3.16 to determine availability of Gtk::Label::set_xalign().