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|
# GET_ARM_ISA
# ----------------------------------
# Get info about the ISA on the ARM arch
AC_DEFUN([GET_ARM_ISA],
[
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[],
[#if defined(__ARM_ARCH_2__) || \
defined(__ARM_ARCH_3__) || \
defined(__ARM_ARCH_3M__) || \
defined(__ARM_ARCH_4__) || \
defined(__ARM_ARCH_4T__) || \
defined(__ARM_ARCH_5__) || \
defined(__ARM_ARCH_5T__) || \
defined(__ARM_ARCH_5E__) || \
defined(__ARM_ARCH_5TE__)
return 0;
#else
not pre arm v6
#endif]
)],
[AC_DEFINE(arm_HOST_ARCH_PRE_ARMv6, 1, [ARM pre v6])
AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
changequote(, )dnl
ARM_ISA=ARMv5
ARM_ISA_EXT="[]"
changequote([, ])dnl
],
[
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[],
[#if defined(__ARM_ARCH_6__) || \
defined(__ARM_ARCH_6J__) || \
defined(__ARM_ARCH_6T2__) || \
defined(__ARM_ARCH_6Z__) || \
defined(__ARM_ARCH_6ZK__) || \
defined(__ARM_ARCH_6K__) || \
defined(__ARM_ARCH_6KZ__) || \
defined(__ARM_ARCH_6M__)
return 0;
#else
not pre arm v7
#endif]
)],
[AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
if grep -q Raspbian /etc/issue && uname -m | grep -q armv7; then
# Raspbian unfortunately makes some extremely questionable
# packaging decisions, configuring gcc to compile for ARMv6
# despite the fact that the RPi4 is ARMv8. As ARMv8 doesn't
# support all instructions supported by ARMv6 this can
# break. Work around this by checking uname to verify
# that we aren't running on armv7.
# See #17856.
AC_MSG_NOTICE([Found compiler which claims to target ARMv6 running on ARMv7, assuming this is ARMv7 on Raspbian (see T17856)])
ARM_ISA=ARMv7
changequote(, )dnl
ARM_ISA_EXT="[VFPv2]"
changequote([, ])dnl
else
ARM_ISA=ARMv6
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[],
[#if defined(__VFP_FP__)
return 0;
#else
no vfp
#endif]
)],
[changequote(, )dnl
ARM_ISA_EXT="[VFPv2]"
changequote([, ])dnl
],
[changequote(, )dnl
ARM_ISA_EXT="[]"
changequote([, ])dnl
]
)
fi],
[changequote(, )dnl
ARM_ISA=ARMv7
ARM_ISA_EXT="[VFPv3,NEON]"
changequote([, ])dnl
])
])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[],
[#if defined(__SOFTFP__)
return 0;
#else
not softfp
#endif]
)],
[changequote(, )dnl
ARM_ABI="SOFT"
changequote([, ])dnl
],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[],
[#if defined(__ARM_PCS_VFP)
return 0;
#else
no hard float ABI
#endif]
)],
[ARM_ABI="HARD"],
[ARM_ABI="SOFTFP"]
)]
)
AC_SUBST(ARM_ISA)
])
|
