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authorGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2016-11-05 19:18:50 +0100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2016-11-07 23:06:44 +0100
commit187e5bc92b63eb652e326364eaf1fd874fc1d170 (patch)
treeb7cec013e828012c3b25c71998145a632d7a9b85 /package
parentc30dd540c4a82ea527fe9f5dd94443d9dc0c4919 (diff)
downloadbuildroot-187e5bc92b63eb652e326364eaf1fd874fc1d170.tar.gz
buildroot-187e5bc92b63eb652e326364eaf1fd874fc1d170.tar.bz2
libmpeg2: add patch to fix build on ARMv7-M
This commit adds a patch to libmpeg2 that improves the ARM detection to not use the optimized ARM code on ARMv7-M architectures. Fixes: http://autobuild.buildroot.net/results/9c44de035ce81c6cc8a92ea8bad4def25cd99cd0 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'package')
-rw-r--r--package/libmpeg2/0003-fix-arm-detection.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/package/libmpeg2/0003-fix-arm-detection.patch b/package/libmpeg2/0003-fix-arm-detection.patch
new file mode 100644
index 0000000000..69ec4547de
--- /dev/null
+++ b/package/libmpeg2/0003-fix-arm-detection.patch
@@ -0,0 +1,39 @@
+Improve the ARM detection to work on Thumb-only architecture
+
+The ARM-specific assembly code doesn't build on Thumb-only
+architectures such as ARMv7-M, but the configure script assumes that
+if the host tuple is arm*, then it can build and use the ARM optimized
+code.
+
+This patch improves the configure.ac detection logic, by building one
+of the instruction of the optimized assembly code, and using this to
+decide whether or not the optimizations should be enabled.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+Index: b/configure.ac
+===================================================================
+--- a/configure.ac
++++ b/configure.ac
+@@ -101,8 +101,10 @@
+ alpha*)
+ AC_DEFINE([ARCH_ALPHA],,[alpha architecture]);;
+ arm*)
+- arm_conditional=:
+- AC_DEFINE([ARCH_ARM],,[ARM architecture]);;
++ AC_TRY_LINK([], [asm(".syntax divided\nstmfd sp!,{r4-r11,lr}")],
++ [AC_DEFINE([ARCH_ARM],,[ARM architecture])
++ use_arm_optimization=yes],
++ [use_arm_optimization=no])
+ esac
+ elif test x"$CC" = x"tendracc"; then
+ dnl TenDRA portability checking compiler
+@@ -122,7 +124,7 @@
+ esac
+ fi
+
+-AM_CONDITIONAL(ARCH_ARM, ${arm_conditional})
++AM_CONDITIONAL(ARCH_ARM, test "${use_arm_optimization}" = "yes")
+
+ dnl Checks for libtool - this must be done after we set cflags
+ AC_LIBTOOL_WIN32_DLL