mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
64 lines
2.3 KiB
Plaintext
64 lines
2.3 KiB
Plaintext
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 satisify 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 $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE]) \
|
|
&& AC_TRY_COMMAND([${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])
|