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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/loongarch/elf.
dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
dnl Test if the toolchain is new enough for static PIE.
dnl We need a GAS supporting explicit reloc (older GAS produces stack-based
dnl reloc and triggers an internal error in the linker). And, we need GCC to
dnl pass the correct linker flags for static PIE. GCC >= 13 and GAS >= 2.40
dnl satisfy the requirement, but a distro may backport static PIE support into
dnl earlier GCC or Binutils releases as well.
AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on LoongArch],
libc_cv_static_pie_on_loongarch, [
cat > conftest1.S <<\EOF
.global _start
.type _start, @function
_start:
li.w $a7, 93
/* This ensures the assembler supports explicit reloc. */
pcalau12i $a0, %pc_hi20(x)
ld.w $a0, $a0, %pc_lo12(x)
syscall 0
.data
x:
.word 0
/* This should produce an R_LARCH_RELATIVE in the static PIE. */
.dword _start
EOF
cat > conftest2.S <<\EOF
.global f
.type f, @function
f:
/* The linker should be able to handle this and produce a PLT entry. */
la.pcrel $t0, $t0, external_func
jirl $zero, $t0, 0
EOF
libc_cv_static_pie_on_loongarch=no
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE]) \
&& ! AC_TRY_COMMAND([LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP]) \
&& AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S]) \
&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest2.so | grep -q 'R_LARCH_JUMP_SLOT.*external_func'])
then
libc_cv_static_pie_on_loongarch=yes
fi
rm -rf conftest* ])
if test "$libc_cv_static_pie_on_loongarch" = yes; then
AC_DEFINE(SUPPORT_STATIC_PIE)
fi
# Check if gcc supports option -mcmodel=medium.
AC_CACHE_CHECK(whether $CC supports option -mcmodel=medium,
libc_cv_loongarch_cmodel_medium, [
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -mcmodel=medium /dev/null 1>&AS_MESSAGE_LOG_FD); then
libc_cv_loongarch_cmodel_medium=yes
else
libc_cv_loongarch_cmodel_medium=no
fi])
LIBC_CONFIG_VAR([have-cmodel-medium], [$libc_cv_loongarch_cmodel_medium])
# Check if asm support vector instructions.
AC_CACHE_CHECK(for vector support in assembler, libc_cv_loongarch_vec_asm, [dnl
cat > conftest.s <<\EOF
vld $vr0, $sp, 0
EOF
if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest 1>&AS_MESSAGE_LOG_FD); then
libc_cv_loongarch_vec_asm=yes
else
libc_cv_loongarch_vec_asm=no
fi
rm -f conftest*])
if test $libc_cv_loongarch_vec_asm = yes; then
AC_DEFINE(HAVE_LOONGARCH_VEC_ASM)
fi
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