The header file `longlong.h` makes uses of GNU extensions, this trigger
an error when compiling this code with clang. Add a special flag to make
clang tolerate this syntax.
Silence the following warnings triggered using W=1:
CC lib/mpi/generic_mpih-mul1.o
../lib/mpi/generic_mpih-mul1.c:37:13: error: invalid use of a cast in a
inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
and
CC lib/mpi/generic_mpih-mul2.o
../lib/mpi/generic_mpih-mul2.c:36:13: error: invalid use of a cast in a
inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
1 warning generated.
CC lib/mpi/generic_mpih-mul3.o
../lib/mpi/generic_mpih-mul3.c:36:13: error: invalid use of a cast in a
inline asm context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
umul_ppmm(prod_high, prod_low, s1_ptr[j], s2_limb);
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/mpi/longlong.h:824:20: note: expanded from macro 'umul_ppmm'
: "=r" ((USItype) ph) \
~~~~~~~~~~^~
Or even:
../lib/mpi/mpih-div.c:99:16: error: invalid use of a cast in a inline asm
context requiring an l-value: remove the cast or build with
-fheinous-gnu-extensions
sub_ddmmss(n1, n0, n1, n0, d1, d0);
~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Cc: Joel Stanley <j...@jms.id.au>
Cc: Masahiro Yamada <yamada.masah...@socionext.com>
Signed-off-by: Mathieu Malaterre <ma...@debian.org>
---
lib/mpi/Makefile | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib/mpi/Makefile b/lib/mpi/Makefile
index d5874a7f5ff9..de4d96e988a3 100644
--- a/lib/mpi/Makefile
+++ b/lib/mpi/Makefile
@@ -5,6 +5,13 @@
obj-$(CONFIG_MPILIB) = mpi.o
+ifdef CONFIG_CC_IS_CLANG
+CFLAGS_generic_mpih-mul1.o += -fheinous-gnu-extensions
+CFLAGS_generic_mpih-mul2.o += -fheinous-gnu-extensions
+CFLAGS_generic_mpih-mul3.o += -fheinous-gnu-extensions
+CFLAGS_mpih-div.o += -fheinous-gnu-extensions
+endif
+
mpi-y = \
generic_mpih-lshift.o \
generic_mpih-mul1.o \
--
2.20.1
