108 lines
3.0 KiB
Plaintext
108 lines
3.0 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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# 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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grep -F '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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