mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
92 lines
2.8 KiB
Plaintext
92 lines
2.8 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
|
|
# Local configure fragment for sysdeps/arm.
|
|
|
|
dnl It is always possible to access static and hidden symbols in an
|
|
dnl position independent way. This has been true since GCC 4.1,
|
|
dnl which is older than the minimum version required to build libc.
|
|
AC_DEFINE(PI_STATIC_AND_HIDDEN)
|
|
|
|
# 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 $libc_cv_arm_pcs_vfp = yes; then
|
|
AC_DEFINE(HAVE_ARM_PCS_VFP)
|
|
LIBC_CONFIG_VAR([default-abi], [hard])
|
|
else
|
|
LIBC_CONFIG_VAR([default-abi], [soft])
|
|
fi
|
|
|
|
AC_CACHE_CHECK([whether the build tools support the GNU descriptor TLS scheme],
|
|
[libc_cv_arm_tls_desc],
|
|
[old_CFLAGS="$CFLAGS"
|
|
CFLAGS="$CFLAGS -mtls-dialect=gnu2"
|
|
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([asm (".word\tfoo(tlsdesc)");], [])],
|
|
[libc_cv_arm_tls_desc=yes], [libc_cv_arm_tls_desc=no])
|
|
CFLAGS="$old_CFLAGS"])
|
|
if test $libc_cv_arm_tls_desc = yes; then
|
|
LIBC_CONFIG_VAR([have-arm-tls-desc], [yes])
|
|
else
|
|
LIBC_CONFIG_VAR([have-arm-tls-desc], [no])
|
|
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 $libc_cv_arm_pcrel_movw = yes; then
|
|
AC_DEFINE([ARM_PCREL_MOVW_OK])
|
|
fi
|
|
|
|
libc_cv_gcc_unwind_find_fde=no
|
|
|
|
# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
|
|
CFLAGS=${CFLAGS% -fno-unwind-tables}
|
|
|
|
dnl The normal configure check for gcc -fexecptions fails because it can't
|
|
dnl find __aeabi_unwind_cpp_pr0. Work around this here; our GCC definitely
|
|
dnl has -fexceptions.
|
|
libc_cv_gcc_exceptions=yes
|
|
exceptions=-fexceptions
|