This topic applies to Linux*. This content is specific to C++; it does not apply to DPC++.
The Intel® oneAPI DPC++/C++ Compiler is compatible with most versions of the GNU* Compiler Collection (GCC*). The release notes contains a list of compatible versions.
C language object files created with the compiler are binary compatible with the GCC and C/C++ language library. You can use the Intel® oneAPI DPC++/C++ Compiler or the GCC compiler to pass object files to the linker.
The Intel® oneAPI DPC++/C++ Compiler supports many of the language extensions provided by the GNU compilers. See http://www.gnu.org for more information.
dynamically-initialized local static variables
local non-POD class definitions
try/catch
variable length arrays
C++ compilers are interoperable if they can link object files and libraries generated by one compiler with object files and libraries generated by the second compiler, and the resulting executable runs successfully. The Intel® oneAPI DPC++/C++ Compiler is highly compatible with the GNU compilers.
The Intel® oneAPI DPC++/C++ Compiler and GCC support the following predefined macros:
__GNUC__
__GNUG__
__GNUC_MINOR__
__GNUC_PATCHLEVEL__
You can specify the -no-gcc option to undefine these macros. If you need GCC interoperability (-cxxlib), do not use the -no-gcc compiler option.
The Intel® oneAPI DPC++/C++ Compiler uses the GNU tools on the system, such as the GNU header files, including stdio.h, and the GNU linker and libraries. So the compiler has to be compatible with the version of GCC or G++* you have on your system.
By default, the compiler determines which version of GCC or G++ you have installed from the PATH environment variable.
If you want use a version of GCC or G++ other than the default version on your system, you need to use either the -gcc-name or -gxx-name compiler option to specify the path to the version of GCC or G++ that you want to use. For example:
You want to build something that cannot be compiled by the default version of the system compiler, so you need to use a legacy version for compatibility, such as if you want to use third party libraries that are not compatible with the default version of the system compiler.
You want to use a later version of GCC or G++ than the default system compiler.
The Intel® oneAPI DPC++/C++ Compiler driver uses the default version of GCC/G++, or the version you specify, to extract the location of the headers and libraries. The cxxlib options are connected to linking in the GNU C++ library. These options are not directly related to -gcc-name or -gxx-name.
-cxxlib-nostd prevents the compiler from searching the C++ system include directories for the C++ standard library libstdc++. For example: If you specify -cxxlib-nostd, then #include <iostream> does not compile but #include <stdio.h> does. This option also prevents linking of libstdc++, because the driver leaves off the -lstdc++ option.
-no-cxxlib affects the linking of all C++ runtime libraries, not just libstdc++. So a program that only uses printf, for example, does not link if you specify -no-cxxlib, but it does link if you specify -cxxlib-nostd.
-cxxlib=dir modifies the top level location for binaries and libraries. For example, if you specify icx -gxx-name=/my/directory/g++ -cxxlib=/cxxlib/dir, the driver attempts to find G++ in /cxxlib/dir/my/directory
The Intel® oneAPI DPC++/C++ Compiler includes improved support for the following open source tools:
GNU Libtool – a script that allows package developers to provide generic shared library support.
Valgrind – a flexible system for debugging and profiling executables running on x86 processors.
GNU Automake – a tool for automatically generating Makefile.ins from files called Makefile.am.