[Linux kernel] cannot aggregate codegen stmtexpr as lvalue · Issue #4439 · llvm/llvm-project (original) (raw)

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Description

Extended Description

Building the Linux kernel yields the following error, on code that works with gcc:

clang -std=gnu89 -MD -MF fs/jbd/.transaction.o.d -nostdinc -isystem include -Iinclude -I/spare/tmp/linux-2.6.29/arch/x86/include -include include/linux/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -O2 -m64 -march=core2 -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Iarch/x86/include/asm/mach-default -Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -pg -Wdeclaration-after-statement -Wno-pointer-sign -fwrapv -fno-dwarf2-cfi-asm -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(transaction)" -D"KBUILD_MODNAME=KBUILD_STR(jbd)" -c -o fs/jbd/transaction.o fs/jbd/transaction.c
clang: warning: the clang compiler does not yet support '-pg'
warning: unknown warning option: -Wframe-larger-than=2048
fs/jbd/transaction.c:1429:16: error: cannot compile this l-value expression yet
trans_time = ktime_to_ns(ktime_sub(ktime_get(),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/jbd/transaction.c:1429:28: note: instantiated from:
trans_time = ktime_to_ns(ktime_sub(ktime_get(),
^~~~~~~~~
1 diagnostic generated.