[Qemu-devel] [RFC PATCH 0/2] target: Build with CONFIG_SEMIHOSTING disabled

[Philippe Mathieu-Daudé]

Amusingly Miroslav and myself hit this issue at the same time.

Currently there is no way to pass a CONFIG_X to sources in target/,
except via a Makefile rule (and filling with stubs).

Paolo says this is on purpose, CONFIG_X selectors are meant for
devices and we try to avoid having config-devices.mak in
config-target.h.

Some know (arch-specific) limitations are:

- MIPS ITU is accessed by coprocessor instr (ISA feature)
- MIPS timer is accessed by coprocessor instr (ISA feature)
- MIPS semihosting (ISA feature?)
- ARM semihosting (ISA feature?)
- ARMv7 NVIC (device)

This series attempt to fix this the most trivial way, adding
stubs for unreachable code.

Philippe Mathieu-Daudé (2):
  target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled
  target/mips: Add stubs to build with CONFIG_SEMIHOSTING disabled

 target/arm/Makefile.objs      |  3 ++-
 target/arm/arm-semi-stubs.c   | 21 +++++++++++++++++++++
 target/mips/Makefile.objs     |  3 ++-
 target/mips/mips-semi-stubs.c | 23 +++++++++++++++++++++++
 4 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 target/arm/arm-semi-stubs.c
 create mode 100644 target/mips/mips-semi-stubs.c

-- 
2.20.1