At present if you build sandbox on a 32-bit host a lot of errors are produced. This is because CONFIG_HOST_64BIT is enabled by default.
It is quite annoying to have to change that manually before building sandbox. It is also quite confusing for new users.
Add a way to detect the setting and add the appropriate CONFIG_HOST_64BIT=y or CONFIG_HOST_32BIT=y to the defconfig, to avoid this issue.
Tidy up the Kconfig help for the above two options while we are here.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v4: - Use $(HOSTCC) instead of gcc - Add proper Kconfig help
Changes in v3: - Use 'bitness' instead of 'bit'
Changes in v2: - Drop patches previously applied - Put all the packages in gcc.rst
Makefile | 11 ++++++++++- arch/sandbox/Kconfig | 33 ++++++++++++++++++++++++++++----- scripts/kconfig/Makefile | 14 +++++++++++++- 3 files changed, 51 insertions(+), 7 deletions(-)
diff --git a/Makefile b/Makefile index b08bad48738..da9b5e494f8 100644 --- a/Makefile +++ b/Makefile @@ -570,8 +570,17 @@ export KBUILD_DEFCONFIG KBUILD_KCONFIG config: scripts_basic outputmakefile FORCE $(Q)$(MAKE) $(build)=scripts/kconfig $@
+# If nothing is specified explicitly, detect the bit size for sandbox, +# referred to from arch/sandbox/Kconfig +# Add it to the end of the defconfig file %config: scripts_basic outputmakefile FORCE - $(Q)$(MAKE) $(build)=scripts/kconfig $@ + $(Q)if test -f $(srctree)/configs/$@ && \ + ! grep -Eq "CONFIG_HOST_(32|64)BIT=y" $(srctree)/configs/$@; then \ + echo '#include <stdio.h>\nint main(void) { printf("CONFIG_HOST_%dBIT=y\n", __WORDSIZE); return 0; }' \ + | $(HOSTCC) -x c - -o get_word_size; \ + extra=$$(./get_word_size); \ + fi; \ + $(MAKE) $(build)=scripts/kconfig EXTRA_DEFCONFIG=$$extra $@
else # =========================================================================== diff --git a/arch/sandbox/Kconfig b/arch/sandbox/Kconfig index 477c51960da..08d7f3bded6 100644 --- a/arch/sandbox/Kconfig +++ b/arch/sandbox/Kconfig @@ -35,19 +35,42 @@ config SYS_CONFIG_NAME
choice prompt "Run sandbox on 32/64-bit host" - default HOST_64BIT + default HOST_DETECT_BITNESS help - Sandbox can be built on 32-bit and 64-bit hosts. - The default is to build on a 64-bit host and run - on a 64-bit host. If you want to run sandbox on - a 32-bit host, change it here. + Sandbox can be built on 32-bit and 64-bit hosts. This is generally + auto-detected but you can force a particular word size here. If you + see strange warnings about SANDBOX_BITS_PER_LONG then you may have + selected the wrong value.
config HOST_32BIT bool "32-bit host" depends on !PHYS_64BIT + help + Select this if the host is a 32-bit machine. This adjusts various + tests and other features to work correctly in this environment. If + this option is enabled on 64-bit machines you may get build warnings + and/or errors.
config HOST_64BIT bool "64-bit host" + help + Select this if the host is a 64-bit machine. This adjusts various + tests and other features to work correctly in this environment. If + this option is enabled on 32-bit machines you may get build warnings + and/or errors. + +config HOST_DETECT_BITNESS + bool "Auto-detect host bitness" + help + Select this if you want the build system to determine the bitness + automatically. This compiles a small program during the build, then + runs it to determine the bitness using __WORDSIZE (32 or 64 bits). + Then it adds one of the above options (CONFIG_HOST_32 or + CONFIG_HOST_64) to the configuration when creating it. + + In rare situations this may fail, e.g. on an unsupported Operating + System or toolchain, in which case you will likely get build warnings + and errors.
endchoice
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile index 12e525ee31f..4e28a7e5973 100644 --- a/scripts/kconfig/Makefile +++ b/scripts/kconfig/Makefile @@ -12,6 +12,9 @@ PHONY += xconfig gconfig menuconfig config localmodconfig localyesconfig \ # Set SRCARCH to .. fake this Makefile. SRCARCH := ..
+# For U-Boot, EXTRA_DEFCONFIG contains a line to be added to the defconfig +# before processing. If empty, no line is added. + ifdef KBUILD_KCONFIG Kconfig := $(KBUILD_KCONFIG) else @@ -92,8 +95,17 @@ else endif endif
+# If EXTRA_DEFCONFIG is defined, add it to the end of the defconfig, before +# processing. This allows the caller to change a setting on the fly %_defconfig: $(obj)/conf - $(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig) + $(Q)defconfig="$(srctree)/arch/$(SRCARCH)/configs/$@"; \ + if [ -n "$(EXTRA_DEFCONFIG)" ]; then \ + cat $$defconfig >defconfig_tmp; \ + echo $(EXTRA_DEFCONFIG) >>defconfig_tmp; \ + $< $(silent) --defconfig=defconfig_tmp $(Kconfig); \ + else \ + $< $(silent) --defconfig=$$defconfig $(Kconfig); \ + fi
# Added for U-Boot (backward compatibility) %_config: %_defconfig