> Hi, > > the build with -O0 fails with: > > make -f scripts/Makefile.build obj=init > gcc -Wp,-MD,init/.main.o.d -nostdinc -isystem > /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include -I./arch/um/include > -Iarch/um/include/generated -Iinclude -I./arch/um/include/uapi > -Iarch/um/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi > -include ./include/linux/kconfig.h -D__KERNEL__ -m64 -I./arch/x86/um > -I./arch/x86/include -I./arch/x86/include/uapi -Iarch/x86/include/generated > -Iarch/x86/include/generated/uapi -Wall -Wundef -Wstrict-prototypes > -Wno-trigraphs -fno-strict-aliasing -fno-common > -Werror-implicit-function-declaration -Wno-format-security -mcmodel=large > -fno-builtin -m64 -funit-at-a-time -D__arch_um__ -I./arch/um/include/shared > -I./arch/x86/um/shared -I./arch/um/include/shared/skas -Dvmap=kernel_vmap > -Din6addr_loopback=kernel_in6addr_loopback -Din6addr_any=kernel_in6addr_any > -Dstrrchr=kernel_strrchr -D_LARGEFILE64_SOURCE -Derrno=kernel_errno > -Dsigprocmask=kernel_sigprocmask -Dmktime=kernel_mktime > -fno-delete-null-pointer-checks -O0 -Wframe-larger-than=1024 > -fno-stack-protector -Wno-unused-but-set-variable -fno-omit-frame-pointer > -fno-optimize-sibling-calls -fno-var-tracking-assignments -g > -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow > -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes > -DCC_HAVE_ASM_GOTO -D"KBUILD_STR(s)=#s" > -D"KBUILD_BASENAME=KBUILD_STR(main)" -D"KBUILD_MODNAME=KBUILD_STR(main)" -c > -o init/main.o init/main.c > In file included from ./arch/um/include/asm/fixmap.h:58:0, > from ./arch/um/include/asm/pgtable.h:11, > from include/linux/mm.h:51, > from include/linux/ring_buffer.h:5, > from include/linux/ftrace_event.h:5, > from include/trace/syscall.h:6, > from include/linux/syscalls.h:80, > from init/main.c:18: > include/asm-generic/fixmap.h: In function 'fix_to_virt': > include/asm-generic/fixmap.h:31:2: error: size of unnamed array is negative > BUILD_BUG_ON(idx >= __end_of_fixed_addresses); > ^ > make[1]: *** [init/main.o] Error 1 > make: *** [init] Error 2 > > bug or feature? > > any ideas? > > switching BUILD_BUG_ON unconditionally to BUILD_BUG_ON_MSG - which uses > compiletime_assert() - breaks the build a bit later here: > > gcc -Wp,-MD,arch/um/kernel/skas/.uaccess.o.d -nostdinc -isystem > /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include -I./arch/um/include > -Iarch/um/include/generated -Iinclude -I./arch/um/include/uapi > -Iarch/um/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi > -include ./include/linux/kconfig.h -D__KERNEL__ -m64 -I./arch/x86/um > -I./arch/x86/include -I./arch/x86/include/uapi -Iarch/x86/include/generated > -Iarch/x86/include/generated/uapi -Wall -Wundef -Wstrict-prototypes > -Wno-trigraphs -fno-strict-aliasing -fno-common > -Werror-implicit-function-declaration -Wno-format-security -mcmodel=large > -fno-builtin -m64 -funit-at-a-time -D__arch_um__ -I./arch/um/include/shared > -I./arch/x86/um/shared -I./arch/um/include/shared/skas -Dvmap=kernel_vmap > -Din6addr_loopback=kernel_in6addr_loopback -Din6addr_any=kernel_in6addr_any > -Dstrrchr=kernel_strrchr -D_LARGEFILE64_SOURCE -Derrno=kernel_errno > -Dsigprocmask=kernel_sigprocmask -Dmktime=kernel_mktime > -fno-delete-null-pointer-checks -O0 -Wframe-larger-than=1024 > -fno-stack-protector -Wno-unused-but-set-variable -fno-omit-frame-pointer > -fno-optimize-sibling-calls -fno-var-tracking-assignments -g > -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow > -fconserve-stack -Werror=implicit-int -Werror=strict-prototypes > -DCC_HAVE_ASM_GOTO -D"KBUILD_STR(s)=#s" > -D"KBUILD_BASENAME=KBUILD_STR(uaccess)" > -D"KBUILD_MODNAME=KBUILD_STR(uaccess)" -c -o arch/um/kernel/skas/uaccess.o > arch/um/kernel/skas/uaccess.c > In file included from include/linux/err.h:4:0, > from arch/um/kernel/skas/uaccess.c:6: > arch/um/kernel/skas/uaccess.c: In function 'do_op_one_page': > include/linux/compiler.h:346:20: error: call to '__compiletime_assert_85' > declared with attribute error: BUILD_BUG_ON failed: __same_type(((void > *)addr), struct page *) > prefix ## suffix(); \ > ^ > include/linux/compiler.h:351:2: note: in expansion of macro > '__compiletime_assert' > __compiletime_assert(condition, msg, prefix, suffix) > ^ > include/linux/compiler.h:363:2: note: in expansion of macro > '_compiletime_assert' > _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) > ^ > include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert' > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) > ^ > include/linux/bug.h:74:1: note: in expansion of macro 'BUILD_BUG_ON_MSG' > BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) > ^ > include/linux/highmem.h:125:2: note: in expansion of macro 'BUILD_BUG_ON' > BUILD_BUG_ON(__same_type((addr), struct page *)); \ > ^ > arch/um/kernel/skas/uaccess.c:85:2: note: in expansion of macro > 'kunmap_atomic' > kunmap_atomic((void *)addr); > ^ > make[2]: *** [arch/um/kernel/skas/uaccess.o] Error 1 > make[1]: *** [arch/um/kernel/skas] Error 2 > make: *** [arch/um/kernel] Error 2 >
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