GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. # Local configure fragment for sysdeps/arm. # 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) LIBC_CONFIG_VAR([default-abi], [hard]) else LIBC_CONFIG_VAR([default-abi], [soft]) fi AC_CACHE_CHECK([whether PC-relative relocs in movw/movt work properly], libc_cv_arm_pcrel_movw, [ cat > conftest.s <<\EOF .syntax unified .arm .arch armv7-a .text .globl foo .type foo,%function foo: movw r0, #:lower16:symbol - 1f - 8 movt r0, #:upper16:symbol - 1f - 8 1: add r0, pc @ And now a case with a local symbol. movw r0, #:lower16:3f - 2f - 8 movt r0, #:upper16:3f - 2f - 8 2: add r0, pc bx lr .data .globl symbol .hidden symbol symbol: .long 23 3: .long 17 EOF libc_cv_arm_pcrel_movw=no ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ -nostartfiles -nostdlib -shared \ -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD && LC_ALL=C $READELF -dr conftest.so > conftest.dr 2>&AS_MESSAGE_LOG_FD && { cat conftest.dr 1>&AS_MESSAGE_LOG_FD fgrep 'TEXTREL R_ARM_NONE' conftest.dr > /dev/null || libc_cv_arm_pcrel_movw=yes } rm -f conftest*]) if test $libc_cv_arm_pcrel_movw = yes; then AC_DEFINE([ARM_PCREL_MOVW_OK]) fi # This was buggy in assemblers from GNU binutils versions before 2.25.1 # (it's known to be broken in 2.24 and 2.25; see # https://sourceware.org/bugzilla/show_bug.cgi?id=18383). AC_CACHE_CHECK([whether TPOFF relocs with addends are assembled correctly], libc_cv_arm_tpoff_addend, [ cat > conftest.s <<\EOF .syntax unified .arm .arch armv7-a .text foo: .word tbase(tpoff)+4 .section .tdata,"awT",%progbits .word -4 tbase: .word 0 .word 4 EOF libc_cv_arm_tpoff_addend=no ${CC-cc} -c $CFLAGS $CPPFLAGS \ -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD && LC_ALL=C $READELF -x.text conftest.o > conftest.x 2>&AS_MESSAGE_LOG_FD && { cat conftest.x 1>&AS_MESSAGE_LOG_FD $AWK 'BEGIN { result = 2 } $1 ~ /0x0+/ && $2 ~ /[[0-9a-f]]+/ { # Check for little-endian or big-endian encoding of 4 in the in-place addend. result = ($2 == "04000000" || $2 == "00000004") ? 0 : 1 } END { exit(result) } ' conftest.x 2>&AS_MESSAGE_LOG_FD && libc_cv_arm_tpoff_addend=yes } rm -f conftest*]) if test $libc_cv_arm_tpoff_addend = no; then LIBC_CONFIG_VAR([test-xfail-tst-tlsalign], [yes]) LIBC_CONFIG_VAR([test-xfail-tst-tlsalign-static], [yes]) fi libc_cv_gcc_unwind_find_fde=no # Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac. CFLAGS=${CFLAGS% -fno-unwind-tables}