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56583289b1
GCC 4.7 added support for ARM TLS descriptors. The binutils support is present in binutils 2.22. Thus, this patch removes the associated configure test as obsolete (leaving Makefile conditionals, as NaCl sets have-arm-tls-desc = no in its sysdeps fragment). Tested for ARM that installed shared libraries are unchanged by the patch. * sysdeps/arm/configure.ac (libc_cv_arm_tls_desc): Remove configure test. * sysdeps/arm/configure: Regenerated. * sysdeps/arm/Makefile [!have-arm-tls-desc] (have-arm-tls-desc): Define variable if not already defined.
113 lines
3.3 KiB
Plaintext
113 lines
3.3 KiB
Plaintext
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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dnl It is always possible to access static and hidden symbols in an
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dnl position independent way. This has been true since GCC 4.1,
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dnl which is older than the minimum version required to build libc.
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AC_DEFINE(PI_STATIC_AND_HIDDEN)
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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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yes
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#endif
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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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LIBC_CONFIG_VAR([default-abi], [hard])
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else
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LIBC_CONFIG_VAR([default-abi], [soft])
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fi
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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 $libc_cv_arm_pcrel_movw = yes; then
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AC_DEFINE([ARM_PCREL_MOVW_OK])
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fi
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# This was buggy in assemblers from GNU binutils versions before 2.25.1
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# (it's known to be broken in 2.24 and 2.25; see
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# https://sourceware.org/bugzilla/show_bug.cgi?id=18383).
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AC_CACHE_CHECK([whether TPOFF relocs with addends are assembled correctly],
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libc_cv_arm_tpoff_addend, [
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cat > conftest.s <<\EOF
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.syntax unified
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.arm
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.arch armv7-a
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.text
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foo:
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.word tbase(tpoff)+4
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.section .tdata,"awT",%progbits
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.word -4
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tbase: .word 0
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.word 4
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EOF
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libc_cv_arm_tpoff_addend=no
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${CC-cc} -c $CFLAGS $CPPFLAGS \
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-o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD &&
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LC_ALL=C $READELF -x.text conftest.o > conftest.x 2>&AS_MESSAGE_LOG_FD &&
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{
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cat conftest.x 1>&AS_MESSAGE_LOG_FD
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$AWK 'BEGIN { result = 2 }
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$1 ~ /0x0+/ && $2 ~ /[[0-9a-f]]+/ {
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# Check for little-endian or big-endian encoding of 4 in the in-place addend.
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result = ($2 == "04000000" || $2 == "00000004") ? 0 : 1
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}
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END { exit(result) }
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' conftest.x 2>&AS_MESSAGE_LOG_FD && libc_cv_arm_tpoff_addend=yes
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}
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rm -f conftest*])
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if test $libc_cv_arm_tpoff_addend = no; then
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LIBC_CONFIG_VAR([test-xfail-tst-tlsalign], [yes])
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LIBC_CONFIG_VAR([test-xfail-tst-tlsalign-static], [yes])
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fi
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libc_cv_gcc_unwind_find_fde=no
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# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
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CFLAGS=${CFLAGS% -fno-unwind-tables}
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