* Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote: > > Unfortunately, even without the ARCH=i386 'make savedefconfig' doesn't > > seem to be doing the right thing & is dropping the '# CONFIG_64BIT is > > not set' line: > > > Oh, really? > > Without ARCH=i386, it works correctly for me. > > > > masahiro@zoe:~/ref/linux$ make i386_defconfig savedefconfig > # > # No change to .config > # > masahiro@zoe:~/ref/linux$ grep CONFIG_64BIT defconfig > # CONFIG_64BIT is not set Yeah, so why do these two seemingly identical commands produce two different .config's: $ make ARCH=i386 defconfig *** Default configuration is based on 'i386_defconfig' $ make i386_defconfig ? Basically the canonical way to generate a defconfig is to provide an ARCH, then use the common 'defconfig' target: make ARCH=i386 defconfig make ARCH=x86 defconfig make ARCH=arm defconfig make ARCH=arm64 defconfig make ARCH=powerpc defconfig make ARCH=s390 defconfig make ARCH=sparc defconfig make ARCH=sparc64 defconfig ... This is what my build test scripts are using to quick-test cross-arch builds. It's a straightforward way to generate defconfigs without knowing the details of the myriads of random defconfig targets some architectures have, such as: kepler:~/tip> ls arch/arm/configs/ am200epdkit_defconfig gemini_defconfig multi_v5_defconfig s5pv210_defconfig aspeed_g4_defconfig h3600_defconfig multi_v7_defconfig sama5_defconfig aspeed_g5_defconfig h5000_defconfig mv78xx0_defconfig sama7_defconfig assabet_defconfig hackkit_defconfig mvebu_v5_defconfig shannon_defconfig at91_dt_defconfig hisi_defconfig mvebu_v7_defconfig shmobile_defconfig axm55xx_defconfig imxrt_defconfig mxs_defconfig simpad_defconfig badge4_defconfig imx_v4_v5_defconfig neponset_defconfig socfpga_defconfig bcm2835_defconfig imx_v6_v7_defconfig netwinder_defconfig sp7021_defconfig cerfcube_defconfig integrator_defconfig nhk8815_defconfig spear13xx_defconfig clps711x_defconfig iop32x_defconfig omap1_defconfig spear3xx_defconfig cm_x300_defconfig ixp4xx_defconfig omap2plus_defconfig spear6xx_defconfig cns3420vb_defconfig jornada720_defconfig orion5x_defconfig spitz_defconfig colibri_pxa270_defconfig keystone_defconfig oxnas_v6_defconfig stm32_defconfig colibri_pxa300_defconfig lart_defconfig palmz72_defconfig sunxi_defconfig collie_defconfig lpc18xx_defconfig pcm027_defconfig tct_hammer_defconfig corgi_defconfig lpc32xx_defconfig pleb_defconfig tegra_defconfig davinci_all_defconfig lpd270_defconfig pxa168_defconfig trizeps4_defconfig dove_defconfig lubbock_defconfig pxa255-idp_defconfig u8500_defconfig dram_0x00000000.config magician_defconfig pxa3xx_defconfig versatile_defconfig dram_0xc0000000.config mainstone_defconfig pxa910_defconfig vexpress_defconfig dram_0xd0000000.config milbeaut_m10v_defconfig pxa_defconfig vf610m4_defconfig ep93xx_defconfig mini2440_defconfig qcom_defconfig viper_defconfig eseries_pxa_defconfig mmp2_defconfig realview_defconfig vt8500_v6_v7_defconfig exynos_defconfig moxart_defconfig rpc_defconfig xcep_defconfig ezx_defconfig mps2_defconfig s3c2410_defconfig zeus_defconfig footbridge_defconfig multi_v4t_defconfig s3c6400_defconfig But this doesn't seem to be working reliably on i386: kepler:~/tip> make i386_defconfig # # configuration written to .config # kepler:~/tip> /bin/cp .config .config.i386_defconfig.1 kepler:~/tip> make ARCH=i386 defconfig *** Default configuration is based on 'i386_defconfig' # # configuration written to .config # kepler:~/tip> /bin/cp .config .config.i386_defconfig.2 kepler:~/tip> diff -up .config.i386_defconfig.1 .config.i386_defconfig.2 --- .config.i386_defconfig.1 2022-09-04 11:34:48.253202205 +0200 +++ .config.i386_defconfig.2 2022-09-04 11:35:04.268758331 +0200 @@ -1,6 +1,6 @@ # # Automatically generated file; DO NOT EDIT. -# Linux/x86 6.0.0-rc3 Kernel Configuration +# Linux/i386 6.0.0-rc3 Kernel Configuration # CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 12-20220319-1ubuntu1) 12.0.1 20220319 (experimental) [master r12-7719-g8ca61ad148f]" CONFIG_CC_IS_GCC=y @@ -261,7 +261,6 @@ CONFIG_PROFILING=y CONFIG_TRACEPOINTS=y # end of General setup -# CONFIG_64BIT is not set CONFIG_X86_32=y CONFIG_X86=y CONFIG_INSTRUCTION_DECODER=y Note how in the ARCH=i386 case the build system claims to use i386_defconfig: *** Default configuration is based on 'i386_defconfig' But that doesn't seem to be identical with when we specify i386_defconfig directly as a target... What am I missing? Thanks, Ingo
