187e5bc92b
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>
40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
Improve the ARM detection to work on Thumb-only architecture
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The ARM-specific assembly code doesn't build on Thumb-only
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architectures such as ARMv7-M, but the configure script assumes that
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if the host tuple is arm*, then it can build and use the ARM optimized
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code.
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This patch improves the configure.ac detection logic, by building one
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of the instruction of the optimized assembly code, and using this to
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decide whether or not the optimizations should be enabled.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Index: b/configure.ac
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===================================================================
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--- a/configure.ac
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+++ b/configure.ac
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@@ -101,8 +101,10 @@
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alpha*)
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AC_DEFINE([ARCH_ALPHA],,[alpha architecture]);;
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arm*)
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- arm_conditional=:
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- AC_DEFINE([ARCH_ARM],,[ARM architecture]);;
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+ AC_TRY_LINK([], [asm(".syntax divided\nstmfd sp!,{r4-r11,lr}")],
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+ [AC_DEFINE([ARCH_ARM],,[ARM architecture])
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+ use_arm_optimization=yes],
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+ [use_arm_optimization=no])
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esac
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elif test x"$CC" = x"tendracc"; then
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dnl TenDRA portability checking compiler
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@@ -122,7 +124,7 @@
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esac
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fi
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-AM_CONDITIONAL(ARCH_ARM, ${arm_conditional})
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+AM_CONDITIONAL(ARCH_ARM, test "${use_arm_optimization}" = "yes")
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dnl Checks for libtool - this must be done after we set cflags
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AC_LIBTOOL_WIN32_DLL
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