diff options
Diffstat (limited to 'sysdeps/arm/configure.ac')
| -rw-r--r-- | sysdeps/arm/configure.ac | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/sysdeps/arm/configure.ac b/sysdeps/arm/configure.ac index 86c0c08317..002b8ef365 100644 --- a/sysdeps/arm/configure.ac +++ b/sysdeps/arm/configure.ac @@ -17,8 +17,8 @@ dnl it. Until we do, don't define it. 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 + yes + #endif ], libc_cv_arm_pcs_vfp=yes, libc_cv_arm_pcs_vfp=no)]) if test $libc_cv_arm_pcs_vfp = yes; then AC_DEFINE(HAVE_ARM_PCS_VFP) @@ -40,6 +40,46 @@ else LIBC_CONFIG_VAR([have-arm-tls-desc], [no]) fi +AC_CACHE_CHECK([whether PC-relative relocs in movw/movt work properly], + libc_cv_arm_pcrel_movw, [ +cat > conftest.s <<\EOF + .syntax unified + .arm + .arch armv7-a + + .text + .globl foo + .type foo,%function +foo: movw r0, #:lower16:symbol - 1f - 8 + movt r0, #:upper16:symbol - 1f - 8 +1: add r0, pc + @ And now a case with a local symbol. + movw r0, #:lower16:3f - 2f - 8 + movt r0, #:upper16:3f - 2f - 8 +2: add r0, pc + bx lr + +.data + .globl symbol + .hidden symbol +symbol: .long 23 +3: .long 17 +EOF +libc_cv_arm_pcrel_movw=no +${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. |