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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/arm.
# Check for support of thread-local storage handling in assembler and
# linker.
AC_CACHE_CHECK(for ARM TLS support, libc_cv_arm_tls, [dnl
cat > conftest.s <<\EOF
.section ".tdata", "awT", %progbits
.globl foo
foo: .long 1
.section ".tbss", "awT", %nobits
.globl bar
bar: .skip 4
.text
.word foo(tpoff)
.word foo(tlsgd)
EOF
dnl
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_arm_tls=yes
else
libc_cv_arm_tls=no
fi
rm -f conftest*])
if test $libc_cv_arm_tls = no; then
AC_MSG_ERROR([the assembler must support TLS])
fi
dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
dnl NOTE: This feature was added by the GCC TLS patches. We should test for
dnl it. Until we do, don't define it.
#AC_DEFINE(PI_STATIC_AND_HIDDEN)
AC_CACHE_CHECK([whether the CFI directive .cfi_sections is supported],
[libc_cv_asm_cfi_directive_sections],
[cat > conftest.s <<EOF
.text
.cfi_sections .debug_frame, .eh_frame
.cfi_startproc
.cfi_endproc
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_cfi_directive_sections=yes
else
libc_cv_asm_cfi_directive_sections=no
fi
rm -f conftest*])
if test $libc_cv_asm_cfi_directive_sections != yes; then
AC_MSG_ERROR([need .cfi_sections in this configuration])
fi
# We check to see if the compiler and flags are
# selecting the hard-float ABI and if they are then
# we set libc_cv_arm_pcs_vfp to yes which causes
# HAVE_ARM_PCS_VFP to be defined in config.h and
# in include/libc-symbols.h and thus available to
# shlib-versions to select the appropriate name for
# the dynamic linker via %ifdef.
AC_CACHE_CHECK([whether the compiler is using the ARM hard-float ABI],
[libc_cv_arm_pcs_vfp],
[AC_EGREP_CPP(yes,[#ifdef __ARM_PCS_VFP
yes
#endif
], libc_cv_arm_pcs_vfp=yes, libc_cv_arm_pcs_vfp=no)])
if test $libc_cv_arm_pcs_vfp = yes; then
AC_DEFINE(HAVE_ARM_PCS_VFP)
fi
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