Hi,
I just tried building EFL 1.8 on my Chromebook at it appears that even
though the CPU supports NEON, the code snippet doing NEON detection in
configure.ac fails (using Debian Unstable, GCC 4.8.2):
configure:23270: checking whether to use NEON instructions
configure:23283: gcc -std=gnu99 -c -g -O2 -fstack-protector
--param=ssp-buffer-size=4 -Wformat -Werror=format-security
-fvisibility=hidden -D_FORTIFY_SOURCE=2 conftest.c >&5
In file included from conftest.c:59:0:
/usr/lib/gcc/arm-linux-gnueabihf/4.8/include/arm_neon.h:32:2: error:
#error You must enable NEON instructions (e.g. -mfloat-abi=softfp
-mfpu=neon) to use arm_neon.h
#error You must enable NEON instructions (e.g. -mfloat-abi=softfp
-mfpu=neon) to use arm_neon.h
^
The following patch fixes the issue for me. Does that look OK to you?
In that case, can it be cherry-picked in the efl-1.8 branch?
--- configure.ac 2014-01-07 15:25:10.000000000 +0100
+++ configure.ac 2014-01-19 10:12:04.658764527 +0100
@@ -516,6 +516,8 @@
arm*)
build_cpu_neon="yes"
AC_MSG_CHECKING([whether to use NEON instructions])
+ CFLAGS_save="${CFLAGS}"
+ CFLAGS="${CFLAGS} -mfpu=neon"
AC_TRY_COMPILE([#include <arm_neon.h>],
[asm volatile ("vqadd.u8 d0, d1, d0\n")],
[
@@ -527,6 +529,7 @@
AC_MSG_RESULT([no])
build_cpu_neon="no"
])
+ CFLAGS="${CFLAGS_save}"
;;
esac
Thanks,
--
Albin
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