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Re: libatomic on ARM




On 19/04/16 10:52, Sebastian Huber wrote:
Hello,

I tried to build the libatomic for RTEMS on ARM and I got this error:

make[2]: Entering directory `/build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/thumb/armv6-m/libatomic' /bin/sh ./libtool --tag=CC --mode=compile /build/git-build/b-gcc-git-arm-rtems4.12/./gcc/xgcc -B/build/git-build/b-gcc-git-arm-rtems4.12/./gcc/ -nostdinc -B/build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/thumb/armv6-m/newlib/ -isystem /build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/thumb/armv6-m/newlib/targ-include -isystem /home/EB/sebastian_h/archive/gcc-git/newlib/libc/include -B/opt/rtems-4.12/arm-rtems4.12/bin/ -B/opt/rtems-4.12/arm-rtems4.12/lib/ -isystem /opt/rtems-4.12/arm-rtems4.12/include -isystem /opt/rtems-4.12/arm-rtems4.12/sys-include -mthumb -march=armv6-m -DHAVE_CONFIG_H -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/arm -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/rtems -I/home/EB/sebastian_h/archive/gcc-git/libatomic -I. -Wall -Werror -g -O2 -fno-sync-libcalls -fno-sync-libcalls -MT exch_1_.lo -MD -MP -MF .deps/exch_1_.lo.Ppo -DN=1 -c -o exch_1_.lo /home/EB/sebastian_h/archive/gcc-git/libatomic/config/arm/exch_n.c libtool: compile: /build/git-build/b-gcc-git-arm-rtems4.12/./gcc/xgcc -B/build/git-build/b-gcc-git-arm-rtems4.12/./gcc/ -nostdinc -B/build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/thumb/armv6-m/newlib/ -isystem /build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/thumb/armv6-m/newlib/targ-include -isystem /home/EB/sebastian_h/archive/gcc-git/newlib/libc/include -B/opt/rtems-4.12/arm-rtems4.12/bin/ -B/opt/rtems-4.12/arm-rtems4.12/lib/ -isystem /opt/rtems-4.12/arm-rtems4.12/include -isystem /opt/rtems-4.12/arm-rtems4.12/sys-include -mthumb -march=armv6-m -DHAVE_CONFIG_H -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/arm -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/rtems -I/home/EB/sebastian_h/archive/gcc-git/libatomic -I. -Wall -Werror -g -O2 -fno-sync-libcalls -fno-sync-libcalls -MT exch_1_.lo -MD -MP -MF .deps/exch_1_.lo.Ppo -DN=1 -c /home/EB/sebastian_h/archive/gcc-git/libatomic/config/arm/exch_n.c -o exch_1_.o
/tmp/ccrU82YJ.s: Assembler messages:
/tmp/ccrU82YJ.s:58: Error: selected processor does not support `uadd8 r3,r3,r3' in Thumb mode /tmp/ccrU82YJ.s:59: Error: selected processor does not support `ldrex r2,[r0]' in Thumb mode /tmp/ccrU82YJ.s:60: Error: selected processor does not support `sel r3,r1,r2' in Thumb mode /tmp/ccrU82YJ.s:61: Error: selected processor does not support `strex r5,r3,[r0]' in Thumb mode

In "libatomic/config/arm/arm-config.h" we have:

#if __ARM_ARCH__ >= 7 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
# define HAVE_STREX    1
# define HAVE_STREXBHD    1
#elif __ARM_ARCH__ == 6
# define HAVE_STREX    1
#endif

Is there a particular reason why this file uses __ARM_ARCH_* and not directly __ARM_FEATURE_LDREX?

The following patch would fix the build problem:

diff --git a/libatomic/config/arm/arm-config.h b/libatomic/config/arm/arm-config.h
index 19331e3..79f422f 100644
--- a/libatomic/config/arm/arm-config.h
+++ b/libatomic/config/arm/arm-config.h
@@ -68,7 +68,7 @@
#if __ARM_ARCH__ >= 7 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
 # define HAVE_STREX    1
 # define HAVE_STREXBHD 1
-#elif __ARM_ARCH__ == 6
+#elif __ARM_ARCH__ == 6 && !defined(__ARM_ARCH_6M__)
 # define HAVE_STREX    1
 #endif



Next error:

/build/git-build/b-gcc-git-arm-rtems4.12/./gcc/xgcc -B/build/git-build/b-gcc-git-arm-rtems4.12/./gcc/ -nostdinc -B/build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/newlib/ -isystem /build/git-build/b-gcc-git-arm-rtems4.12/arm-rtems4.12/newlib/targ-include -isystem /home/EB/sebastian_h/archive/gcc-git/newlib/libc/include -B/opt/rtems-4.12/arm-rtems4.12/bin/ -B/opt/rtems-4.12/arm-rtems4.12/lib/ -isystem /opt/rtems-4.12/arm-rtems4.12/include -isystem /opt/rtems-4.12/arm-rtems4.12/sys-include -DHAVE_CONFIG_H -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/arm -I/home/EB/sebastian_h/archive/gcc-git/libatomic/config/rtems -I/home/EB/sebastian_h/archive/gcc-git/libatomic -I. -Wall -Werror -g -O2 -mthumb -march=armv7-m -MT tas_1_.lo -MD -MP -MF .deps/tas_1_.lo.Ppo -DN=1 -c /home/EB/sebastian_h/archive/gcc-git/libatomic/tas_n.c -o tas_1_.o
/tmp/cc0LN4Eh.s: Assembler messages:
/tmp/cc0LN4Eh.s:58: Error: selected processor does not support `uadd8 r3,r3,r3' in Thumb mode /tmp/cc0LN4Eh.s:60: Error: selected processor does not support `sel r3,r1,r4' in Thumb mode

--
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber@embedded-brains.de
PGP     : Public key available on request.

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