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])