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e0590f41fe
This patch referents the commit 374cef3 to add static-pie support. And
because the dummy link map is used when relocating ourselves, so need
not to set __global_pointer$ at this time.
It will also check whether toolchain supports to build static-pie.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/riscv/elf.
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# Check if static linker supports R_RISCV_ALIGN
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AC_CACHE_CHECK([for R_RISCV_ALIGN linker relaxation support], [libc_cv_riscv_r_align],[dnl
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cat > conftest.S <<EOF
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.align 3
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foo:
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li a0,42
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ret
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EOF
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libc_cv_riscv_r_align=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles $no_ssp -shared -fPIC -o contests.o conftest.S])
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then
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libc_cv_riscv_r_align=yes
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fi
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rm -rf conftest.*])
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LIBC_CONFIG_VAR([riscv-r-align], [$libc_cv_riscv_r_align])
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dnl Test if the toolchain is new enough for static PIE.
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AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on RISC-V],
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libc_cv_static_pie_on_riscv, [
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cat > conftest1.S <<\EOF
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.globl _start
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.type _start, @function
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_start:
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nop
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.data
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/* This should produce an R_RISCV_RELATIVE in the static PIE. */
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.dword _start
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EOF
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libc_cv_static_pie_on_riscv=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
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&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_RISCV_RELATIVE]) \
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&& ! AC_TRY_COMMAND([LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP])
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then
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libc_cv_static_pie_on_riscv=yes
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fi
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rm -rf conftest* ])
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if test "$libc_cv_static_pie_on_riscv" = yes; then
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AC_DEFINE(SUPPORT_STATIC_PIE)
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fi
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