[Qemu-devel] [PATCH 4/4] multiboot: make tests work with clang

[Anatol Pomozov]

 * clang 3.8 enables SSE even for 32bit code. Generate code for pentium
   CPU to make sure no new instructions are used.
 * add memset() implementation. Clang implements array zeroing in
   print_num() via memset() function call.
---
 tests/multiboot/Makefile    | 2 +-
 tests/multiboot/libc.c      | 9 +++++++++
 tests/multiboot/libc.h      | 2 ++
 tests/multiboot/run_test.sh | 1 +
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/tests/multiboot/Makefile b/tests/multiboot/Makefile
index b6a5056347..79dfe85afc 100644
--- a/tests/multiboot/Makefile
+++ b/tests/multiboot/Makefile
@@ -1,5 +1,5 @@
 CC=gcc
-CCFLAGS=-m32 -Wall -Wextra -Werror -fno-stack-protector -nostdinc -fno-builtin
+CCFLAGS=-m32 -Wall -Wextra -Werror -fno-stack-protector -nostdinc -fno-builtin 
-march=pentium
 ASFLAGS=-m32
 
 LD=ld
diff --git a/tests/multiboot/libc.c b/tests/multiboot/libc.c
index 6df9bda96d..512fccd7fa 100644
--- a/tests/multiboot/libc.c
+++ b/tests/multiboot/libc.c
@@ -33,6 +33,15 @@ void* memcpy(void *dest, const void *src, int n)
 
     return dest;
 }
+void *memset(void *s, int c, size_t n)
+{
+    size_t i;
+    char *d = s;
+    for (i = 0; i < n; i++) {
+        *d++ = c;
+    }
+    return s;
+}
 
 static void print_char(char c)
 {
diff --git a/tests/multiboot/libc.h b/tests/multiboot/libc.h
index 04c9922c27..bdf7c34287 100644
--- a/tests/multiboot/libc.h
+++ b/tests/multiboot/libc.h
@@ -36,6 +36,7 @@ typedef signed short int16_t;
 typedef signed char int8_t;
 
 typedef uint32_t uintptr_t;
+typedef uint32_t size_t;
 
 
 /* stdarg.h */
@@ -58,5 +59,6 @@ static inline void outb(uint16_t port, uint8_t data)
 
 void printf(const char *fmt, ...);
 void* memcpy(void *dest, const void *src, int n);
+void* memset(void *s, int c, size_t n);
 
 #endif
diff --git a/tests/multiboot/run_test.sh b/tests/multiboot/run_test.sh
index f04e35cbf0..38dcfef42c 100755
--- a/tests/multiboot/run_test.sh
+++ b/tests/multiboot/run_test.sh
@@ -29,6 +29,7 @@ run_qemu() {
     printf %b "\n\n=== Running test case: $kernel $* ===\n\n" >> test.log
 
     $QEMU \
+        -cpu pentium \
         -kernel $kernel \
         -display none \
         -device isa-debugcon,chardev=stdio \
-- 
2.15.0.rc0.271.g36b669edcc-goog