If we build lscpu as PIE, we currently get a build failure:
lscpu.c: In function 'main':
lscpu.c:333: error: can't find a register in class 'BREG' while reloading 'asm'
lscpu.c:333: error: 'asm' operand has impossible constraints
make[2]: *** [lscpu.o] Error 1
So we need a little bit of register shuffling to keep gcc happy.
Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx>
---
sys-utils/lscpu.c | 16 +++++++++++++---
1 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/sys-utils/lscpu.c b/sys-utils/lscpu.c
index 3e3fbbe..6b6082f 100644
--- a/sys-utils/lscpu.c
+++ b/sys-utils/lscpu.c
@@ -330,9 +330,19 @@ static inline void
cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
- __asm__("cpuid"
- : "=a" (*eax),
- "=b" (*ebx),
+ __asm__(
+#if defined(__PIC__) && defined(__i386__)
+ /* x86 PIC cannot clobber ebx -- gcc bitches */
+ "pushl %%ebx;"
+ "cpuid;"
+ "movl %%ebx, %%esi;"
+ "popl %%ebx;"
+ : "=S" (*ebx),
+#else
+ "cpuid;"
+ : "=b" (*ebx),
+#endif
+ "=a" (*eax),
"=c" (*ecx),
"=d" (*edx)
: "0" (op), "c"(0));
--
1.6.2.3
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