Now, under Debian 10+ and Ubuntu 18.04+, we link against the GTK-3 version of wxWidgets (libwxgtk3.0-gtk3-0v5).
Under Debian 9- and Ubuntu 16.04, we link against the GTK-2 version of wxWidgets (libwxgtk3.0-0v5) which is the
only one available.
Also, we now have 2 separate RPM scripts : 'build_cmake_rpm_gtk2.sh' which builds wxWidgets and links it against GTK-2,
then links VeraCrypt against 'gtk2' package (typically to be used under CentOS 6) and 'build_cmake_rpm_gtk3' which builds
wxWidgets and links it against GTK-3, then links VeraCrypt against 'gtk3' package (typically to be used under CentOS 7+).
The DEB script builds VeraCrypt and links it against wxWidgets that comes with the distribution.
The RPM script awaits for wxWidgets-3.0.4 source code which it builds then links VeraCrypt statically to it.
Both scripts create the corresponding package after the build.
Compiling with -mxxx defines the corresponding macro of the intrinsics.
For example, -mssse3 defines __SSSE3__ macro to 1.
In GCC versions < 4.9, it is not possible to use and call x86 intrinsics only at runtime without
compiling the entire file with the -mxxx option.
For example, if we want to call SSSE3 intrinsics without compiling with -mssse3, the macro __SSSE3__ is not defined.
Therefore, when including <tmmintrin.h>, this results in "error "SSSE3 instruction set not enabled"" because of :
#ifndef __SSSE3__
# error "SSSE3 instruction set not enabled"
Since GCC 4.9, this has been fixed and it is possible to call x86 intrinsics from select functions in a file
that are tagged with the corresponding target attribute without having to compile the entire file with the -mxxx option.
This can be seen in <tmmintrin.h> which in recent versions (>= 4.9) contains :
#ifndef __SSSE3__
#pragma GCC push_options
#pragma GCC target("ssse3")
#define __DISABLE_SSSE3__
Since SSSE3 is only used under Windows for ChaCha256, this can be fixed by preceding '#include <tmmintrin.h>' with
#if defined (_MSC_VER) && !defined (TC_WINDOWS_BOOT).
See https://gcc.gnu.org/gcc-4.9/changes.html
El Mostafa Idrassi