clang compile error of hello.c

[winksaville]

I built clang and the gcc tools on my Ubuntu 13-04 linux box with a fork riscv-tools from yesterday.

The gcc tools compile and spike runs hello.c:

wink@ssi-primary:~/prgs/test$ cat hello.c

include <stdio.h>

int main() {
printf("Hello World\n");
}

wink@ssi-primary:~/prgs/test$ riscv-gcc -o hello hello.c

wink@ssi-primary:~/prgs/test$ spike pk hello
Hello World

But clang fails using the suggested command line from here:

wink@ssi-primary:~/prgs/test$ clang -target riscv -mriscv=RV64IAMFD -S hello.c -o hello.S
In file included from hello.c:1:
In file included from /usr/include/stdio.h:27:
In file included from /usr/include/features.h:341:
/usr/include/stdc-predef.h:30:10: fatal error: 'bits/predefs.h' file not found

include <bits/predefs.h>

     ^

1 error generated.

It seems the include paths aren't setup correctly, so I looked around and adding "-nostdinc -I/opt/riscv/riscv-elf/include -I/opt/riscv/lib/clang/3.3/include" worked, but I have a feeling there is a better and more correct way:

wink@ssi-primary:~/prgs/test$ clang -target riscv -mriscv=RV64IAMFD -nostdinc -I/opt/riscv/riscv-elf/include -I/opt/riscv/lib/clang/3.3/include -S hello.c -o hello.S

wink@ssi-primary:~/prgs/test$ cat hello.S
.file "hello.c"
.text
.globl main
.align 4
.type main,@function
main:
addi x14, x14, -32
sd x1, 24(x14)
sd x31, 16(x14)
sd x2, 8(x14)
add x2, x0, x14
lui x16, %hi(.L.str)
addi x18, x16, %lo(.L.str)
jal printf
sw x16, 4(x2)
addiw x16, x0, 0
add x14, x0, x2
ld x2, 8(x14)
ld x31, 16(x14)
ld x1, 24(x14)
addi x14, x14, 32
ret
.Ltmp3:
.size main, .Ltmp3-main

.type   .L.str,@object
.section    .rodata.str1.1,"aMS",@progbits,1

.L.str:
.asciz "Hello World\n"
.size .L.str, 13

.section    ".note.GNU-stack","",@progbits

wink@ssi-primary:~/prgs/test$ riscv-gcc -o hello.riscv hello.S

wink@ssi-primary:~/prgs/test$ spike pk hello.riscv
Hello World

Let me know if there is more information is needed.