Cross compiling Mesa 9.1 and wrong ar and ranlib for libglslcore and libglcpp

Hello,

 I am trying to cross compile Mesa 9.1.0 (because I saw that patches for
cross compiling were added in this release) on a x86_64-box (Gentoo
Linux) for ARM and configured it with:

autoreconf --install --force    #otherwise it complains on my system
./configure --host=armv6j-hardfloat-linux-gnueabi --prefix=/home/shared/vendor/install-gcc-arm-debug --with-gallium-drivers=swrast --with-dri-drivers= --with-expat=/home/shared/vendor/install-gcc-arm-debug

Then I run make with:

make LIBTOOLFLAGS=-v

and receive the following output:
...
libtool: compile:  gcc -DPACKAGE_NAME=\"Mesa\" -DPACKAGE_TARNAME=\"mesa\" -DPACKAGE_VERSION=\"9.1.0\" "-DPACKAGE_STRING=\"Mesa 9.1.0\"" "-DPACKAGE_BUGREPORT=\"https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa\"" -DPACKAGE_URL=\"\" -DPACKAGE=\"mesa\" -DVERSION=\"9.1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_PTHREAD=1 -DHAVE_LIBEXPAT=1 -I. -I ../../../include -I ../../../src/mapi -I ../../../src/mesa -I ../../../src/glsl -I ../../../src/glsl/glcpp -I ../../../src/glsl -D_GNU_SOURCE -g -O2 -Wall -std=c99 -fno-strict-aliasing -fno-builtin-memcmp -MT strtod.lo -MD -MP -MF .deps/strtod.Tpo -c ../../../src/glsl/strtod.c  -fPIC -DPIC -o .libs/strtod.o
  CXXLD  libglslcore.la
libtool: link: armv6j-hardfloat-linux-gnueabi-ar cru .libs/libglslcore.a .libs/glsl_lexer.o .libs/glsl_parser.o .libs/ast_expr.o .libs/ast_function.o .libs/ast_to_hir.o .libs/ast_type.o .libs/builtin_variables.o .libs/glsl_parser_extras.o .libs/glsl_types.o .libs/glsl_symbol_table.o .libs/hir_field_selection.o .libs/ir_basic_block.o .libs/ir_builder.o .libs/ir_clone.o .libs/ir_constant_expression.o .libs/ir.o .libs/ir_expression_flattening.o .libs/ir_function_can_inline.o .libs/ir_function_detect_recursion.o .libs/ir_function.o .libs/ir_hierarchical_visitor.o .libs/ir_hv_accept.o .libs/ir_import_prototypes.o .libs/ir_print_visitor.o .libs/ir_reader.o .libs/ir_rvalue_visitor.o .libs/ir_set_program_inouts.o .libs/ir_validate.o .libs/ir_variable_refcount.o .libs/linker.o .libs/link_functions.o .libs/link_uniforms.o .libs/link_uniform_initializers.o .libs/link_uniform_block_active_visitor.o .libs/link_uniform_blocks.o .libs/link_varyings.o .libs/loop_analysis.o .libs/loop_controls.o .libs/loop_unroll.o .libs/lower_clip_distance.o .libs/lower_discard.o .libs/lower_discard_flow.o .libs/lower_if_to_cond_assign.o .libs/lower_instructions.o .libs/lower_jumps.o .libs/lower_mat_op_to_vec.o .libs/lower_noise.o .libs/lower_packed_varyings.o .libs/lower_packing_builtins.o .libs/lower_texture_projection.o .libs/lower_variable_index_to_cond_assign.o .libs/lower_vec_index_to_cond_assign.o .libs/lower_vec_index_to_swizzle.o .libs/lower_vector.o .libs/lower_output_reads.o .libs/lower_ubo_reference.o .libs/opt_algebraic.o .libs/opt_array_splitting.o .libs/opt_constant_folding.o .libs/opt_constant_propagation.o .libs/opt_constant_variable.o .libs/opt_copy_propagation.o .libs/opt_copy_propagation_elements.o .libs/opt_dead_code.o .libs/opt_dead_code_local.o .libs/opt_dead_functions.o .libs/opt_function_inlining.o .libs/opt_if_simplification.o .libs/opt_noop_swizzle.o .libs/opt_redundant_jumps.o .libs/opt_structure_splitting.o .libs/opt_swizzle_swizzle.o .libs/opt_tree_grafting.o .libs/s_expression.o .libs/strtod.o 
libtool: link: armv6j-hardfloat-linux-gnueabi-ranlib .libs/libglslcore.a
libtool: link: creating libglslcore.la
...
libtool: compile:  gcc -DPACKAGE_NAME=\"Mesa\" -DPACKAGE_TARNAME=\"mesa\" -DPACKAGE_VERSION=\"9.1.0\" "-DPACKAGE_STRING=\"Mesa 9.1.0\"" "-DPACKAGE_BUGREPORT=\"https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa\"" -DPACKAGE_URL=\"\" -DPACKAGE=\"mesa\" -DVERSION=\"9.1.0\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_PTHREAD=1 -DHAVE_LIBEXPAT=1 -I. -I ../../../include -I ../../../src/mapi -I ../../../src/mesa -I ../../../src/glsl -I ../../../src/glsl/glcpp -I ../../../src/glsl -D_GNU_SOURCE -g -O2 -Wall -std=c99 -fno-strict-aliasing -fno-builtin-memcmp -MT pp.lo -MD -MP -MF .deps/pp.Tpo -c ../../../src/glsl/glcpp/pp.c  -fPIC -DPIC -o .libs/pp.o
  CCLD   libglcpp.la
libtool: link: armv6j-hardfloat-linux-gnueabi-ar cru .libs/libglcpp.a .libs/glcpp-lex.o .libs/glcpp-parse.o .libs/ralloc.o .libs/pp.o 
libtool: link: armv6j-hardfloat-linux-gnueabi-ranlib .libs/libglcpp.a
libtool: link: creating libglcpp.la
...
CXX    main.o
  CXXLD  builtin_compiler
libtool: link: g++ -I ../../../include -I ../../../src/mapi -I ../../../src/mesa -I ../../../src/glsl -I ../../../src/glsl/glcpp -I ../../../src/glsl -D_GNU_SOURCE -g -O2 -Wall -fno-strict-aliasing -fno-builtin-memcmp -o builtin_compiler hash_table.o imports.o prog_hash_table.o symbol_table.o builtin_stubs.o standalone_scaffolding.o main.o  ./.libs/libglslcore.a /usr/lib/gcc/armv6j-hardfloat-linux-gnueabi/4.6.3/libstdc++.so -lm ./.libs/libglcpp.a -Wl,-rpath -Wl,/usr/lib/gcc/armv6j-hardfloat-linux-gnueabi/4.6.3 -Wl,-rpath -Wl,/usr/lib/gcc/armv6j-hardfloat-linux-gnueabi/4.6.3
./.libs/libglslcore.a: could not read symbols: Archive has no index; run ranlib to add one
collect2: ld returned 1 exit status

It compiles the object files correctly with my system's compiler, but
for linking the libraries, libtool uses ar and ranlib of the cross
toolchain.

I am not really an autotools expert and I can find no way to tell
libtool to use the correct tools. Maybe I have just overlooked something
trivial.

Thank you for your help,

Martin

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