2010-03-26 18:12:56 +00:00
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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/arm.
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2012-03-27 21:04:59 +00:00
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dnl It is always possible to access static and hidden symbols in an
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dnl position independent way.
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dnl NOTE: This feature was added by the GCC TLS patches. We should test for
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dnl it. Until we do, don't define it.
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#AC_DEFINE(PI_STATIC_AND_HIDDEN)
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2012-05-08 02:14:44 +00:00
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# We check to see if the compiler and flags are
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# selecting the hard-float ABI and if they are then
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# we set libc_cv_arm_pcs_vfp to yes which causes
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# HAVE_ARM_PCS_VFP to be defined in config.h and
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# in include/libc-symbols.h and thus available to
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# shlib-versions to select the appropriate name for
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# the dynamic linker via %ifdef.
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AC_CACHE_CHECK([whether the compiler is using the ARM hard-float ABI],
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[libc_cv_arm_pcs_vfp],
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[AC_EGREP_CPP(yes,[#ifdef __ARM_PCS_VFP
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2014-10-22 21:20:35 +00:00
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yes
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#endif
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2012-05-08 02:14:44 +00:00
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], libc_cv_arm_pcs_vfp=yes, libc_cv_arm_pcs_vfp=no)])
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if test $libc_cv_arm_pcs_vfp = yes; then
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AC_DEFINE(HAVE_ARM_PCS_VFP)
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2013-03-20 23:15:42 +00:00
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LIBC_CONFIG_VAR([default-abi], [hard])
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2012-11-21 21:04:33 +00:00
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else
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2013-03-20 23:15:42 +00:00
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LIBC_CONFIG_VAR([default-abi], [soft])
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2012-05-08 02:14:44 +00:00
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fi
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2014-06-20 19:08:03 +00:00
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AC_CACHE_CHECK([whether the build tools support the GNU descriptor TLS scheme],
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[libc_cv_arm_tls_desc],
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[old_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -mtls-dialect=gnu2"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([asm (".word\tfoo(tlsdesc)");], [])],
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[libc_cv_arm_tls_desc=yes], [libc_cv_arm_tls_desc=no])
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CFLAGS="$old_CFLAGS"])
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if test $libc_cv_arm_tls_desc = yes; then
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LIBC_CONFIG_VAR([have-arm-tls-desc], [yes])
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else
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LIBC_CONFIG_VAR([have-arm-tls-desc], [no])
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fi
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2014-07-16 22:18:36 +00:00
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2014-10-22 21:20:35 +00:00
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AC_CACHE_CHECK([whether PC-relative relocs in movw/movt work properly],
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libc_cv_arm_pcrel_movw, [
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cat > conftest.s <<\EOF
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.syntax unified
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.arm
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.arch armv7-a
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.text
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.globl foo
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.type foo,%function
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foo: movw r0, #:lower16:symbol - 1f - 8
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movt r0, #:upper16:symbol - 1f - 8
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1: add r0, pc
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@ And now a case with a local symbol.
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movw r0, #:lower16:3f - 2f - 8
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movt r0, #:upper16:3f - 2f - 8
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2: add r0, pc
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bx lr
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.data
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.globl symbol
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.hidden symbol
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symbol: .long 23
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3: .long 17
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EOF
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libc_cv_arm_pcrel_movw=no
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${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
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-nostartfiles -nostdlib -shared \
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-o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD &&
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LC_ALL=C $READELF -dr conftest.so > conftest.dr 2>&AS_MESSAGE_LOG_FD &&
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{
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cat conftest.dr 1>&AS_MESSAGE_LOG_FD
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fgrep 'TEXTREL
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R_ARM_NONE' conftest.dr > /dev/null || libc_cv_arm_pcrel_movw=yes
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}
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rm -f conftest*])
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if test $libc_cv_arm_pcrel_movw = yes; then
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AC_DEFINE([ARM_PCREL_MOVW_OK])
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fi
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2014-07-16 22:18:36 +00:00
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libc_cv_gcc_unwind_find_fde=no
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# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
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CFLAGS=${CFLAGS% -fno-unwind-tables}
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dnl The normal configure check for gcc -fexecptions fails because it can't
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dnl find __aeabi_unwind_cpp_pr0. Work around this here; our GCC definitely
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dnl has -fexceptions.
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libc_cv_gcc_exceptions=yes
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exceptions=-fexceptions
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