ta: experimental C++ support

Update the TA makefiles to support C++ (file extension: .cpp).

This allows the use of C++ in TA and libraries, with limitations (see
below). I consider this work experi

ta: experimental C++ support

Update the TA makefiles to support C++ (file extension: .cpp).

This allows the use of C++ in TA and libraries, with limitations (see
below). I consider this work experimental because it was only tested
with simple cases in xtest, introducing the required changes and
addressing issues one after another. Therefore, some features may be
missing for more complex use cases (additional relocation types or
runtime support...).

Tested with the arm-linux-gnueabihf- and aarch64-linux-gnu- toolchains
(GCC 8.3).

Limitations:

- Clang is not supported at the moment
- Exception handling: shared libraries cannot throw, catch or propagate
exceptions. Doing so would require linking the libraries and the main
program with the shared libgcc [1] which is not straightforward due
to the many dependencies on the GNU libc. Exceptions *can* be used in
the main program however, as well as in static libraries directly
linked with the main program.
- ldelf stack unwinding does not support C++ frames so crash/panic
dumps will likely be truncated when they involve C++ code.

Link: [1] https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html see "-shared-libgcc"
Tested-by: Jerome Forissier <jerome@forissier.org> (QEMU, QEMUv8, HiKey960)
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Cleanup unused comp-cflags$(sm) from libgcc lookup commands

The compiler is not expected to need any flag from $(comp-cflags$(sm))
to locate the compiler runtime libraries, and in fact this variable

Cleanup unused comp-cflags$(sm) from libgcc lookup commands

The compiler is not expected to need any flag from $(comp-cflags$(sm))
to locate the compiler runtime libraries, and in fact this variable is
always undefined at the point it is used. Indeed, comp-cflags$(sm) is
set in mk/compile.mk, i.e., after mk/gcc.mk (or mk/clang.mk) has
been included.

Therefore, remove the useless flags.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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mk/gcc.mk: define LD to bfd version by default

In some cases, ld is linked to gold version,
and it will cause compiling error for 32bit like following:

prebuilts/gcc/linux-x86/arm/arm-linux-android

mk/gcc.mk: define LD to bfd version by default

In some cases, ld is linked to gold version,
and it will cause compiling error for 32bit like following:

prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androideabi-ld: fatal error: --sort-section=alignment: must take one of the following arguments: none, name

with the bfd version ld, there will be no such error reported.

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Introduce CFLAGS32 and CFLAGS64

Previously, compile.mk and gcc.mk were using $(CFLAGS) which cannot
properly handle 32-bit and 64-bit compiles. This commit introduces
CFLAGS32 and CFLAGS64 instead,

Introduce CFLAGS32 and CFLAGS64

Previously, compile.mk and gcc.mk were using $(CFLAGS) which cannot
properly handle 32-bit and 64-bit compiles. This commit introduces
CFLAGS32 and CFLAGS64 instead, which are set to $(CFLAGS) by defaut
for convenience.

For each submodule (core, ta_arm32, ta_arm64) a new internal variable
is defined in the architecture makefile (core/arch/arm/arm.mk):
arch-bits-$(sm). Its value is either 32 or 64. This can later be used
to reference the proper CFLAGS.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Add CFLAGS to libgcc lookup command

GCC may require the --sysroot command line parameter
to find libgcc.a

Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Jerome Forissier <jerome.f

Add CFLAGS to libgcc lookup command

GCC may require the --sysroot command line parameter
to find libgcc.a

Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Tested-by: Zoltan Kuscsik <zoltan.kuscsik@linaro.org>
Signed-off-by: Zoltan Kuscsik <zoltan.kuscsik@linaro.org>

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Separate compiler for core and user TA

Enables compilation with different compilers for core and user TA.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Jens Wiklander <jens.w

Separate compiler for core and user TA

Enables compilation with different compilers for core and user TA.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Jens Wiklander <jens.wiklander@linaro.org> (QEMU, FVP)
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>

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Open-source the TEE Core

Signed-off-by: Pascal Brand <pascal.brand@st.com>