Mark H Weaver skribis: > 13440 execve("/gnu/store/p70wvylq6xdrlxblnk76k3ljgkrmvpnq-ld-wrapper-0/bin/ld", ["/gnu/store/p70wvylq6xdrlxblnk76k3ljgkrmvpnq-ld-wrapper-0/bin/ld", "--eh-frame-hdr", "-shared", "-dynamic-linker", "/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib/ld-linux-armhf.so.3", "-X", "-m", "armelf_linux_eabi", "-o", "/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new", "-L/gnu/store/84bsc47g2052allrmh4ph6xaqvp6f4cm-perl-5.16.1/lib", "-L/gnu/store/lakz7x2m4vqvvfdasn5x95a91rkqqs3c-bzip2-1.0.6/lib", "-L/gnu/store/mrb163wwjc45hgrcjwmb6nxp8fgab3lk-xz-5.0.4/lib", "-L/gnu/store/f1fnh2sp1j32jysdr2nw9z296iba6b5d-file-5.22/lib", "-L/gnu/store/l9ji7gc640j2r8c1c561iwcnqpcd585m-gawk-4.1.1/lib", "-L/gnu/store/w7gjnx5rz64mssxndnryazlwlhflfd2j-binutils-2.25/lib", "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib", "-L/gnu/store/psmxs9gcr9l4arz7agmp94vm8fjwninv-glibc-utf8-locales-2.21/lib", "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4", "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4/../../..", "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib", "-z", "combreloc", "-z", "relro", "--hash-style=both", "-z", "defs", "/tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os", "--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map", "-soname=ld-linux-armhf.so.3", "-defsym=_begin=0"], [/* 55 vars */] Indeed, here’s what happens when passing it through ld-wrapper: --8<---------------cut here---------------start------------->8--- $ GUIX_LD_WRAPPER_DEBUG=yes ld "--eh-frame-hdr" "-shared" "-dynamic-linker" "/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib/ld-linux-armhf.so.3" "-X" "-m" "armelf_linux_eabi" "-o" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new" "-L/gnu/store/84bsc47g2052allrmh4ph6xaqvp6f4cm-perl-5.16.1/lib" "-L/gnu/store/lakz7x2m4vqvvfdasn5x95a91rkqqs3c-bzip2-1.0.6/lib" "-L/gnu/store/mrb163wwjc45hgrcjwmb6nxp8fgab3lk-xz-5.0.4/lib" "-L/gnu/store/f1fnh2sp1j32jysdr2nw9z296iba6b5d-file-5.22/lib" "-L/gnu/store/l9ji7gc640j2r8c1c561iwcnqpcd585m-gawk-4.1.1/lib" "-L/gnu/store/w7gjnx5rz64mssxndnryazlwlhflfd2j-binutils-2.25/lib" "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib" "-L/gnu/store/psmxs9gcr9l4arz7agmp94vm8fjwninv-glibc-utf8-locales-2.21/lib" "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4" "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4/../../.." "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib" "-z" "combreloc" "-z" "relro" "--hash-style=both" "-z" "defs" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os" "--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map" "-soname=ld-linux-armhf.so.3" "-defsym=_begin=0" ld-wrapper: invoking `/gnu/store/z9d24s2wkri1z0ix5r7qqyp7zy3dklb4-binutils-2.25/bin/ld' with ("--eh-frame-hdr" "-shared" "-dynamic-linker" "/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib/ld-linux-armhf.so.3" "-X" "-m" "armelf_linux_eabi" "-o" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new" "-L/gnu/store/84bsc47g2052allrmh4ph6xaqvp6f4cm-perl-5.16.1/lib" "-L/gnu/store/lakz7x2m4vqvvfdasn5x95a91rkqqs3c-bzip2-1.0.6/lib" "-L/gnu/store/mrb163wwjc45hgrcjwmb6nxp8fgab3lk-xz-5.0.4/lib" "-L/gnu/store/f1fnh2sp1j32jysdr2nw9z296iba6b5d-file-5.22/lib" "-L/gnu/store/l9ji7gc640j2r8c1c561iwcnqpcd585m-gawk-4.1.1/lib" "-L/gnu/store/w7gjnx5rz64mssxndnryazlwlhflfd2j-binutils-2.25/lib" "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib" "-L/gnu/store/psmxs9gcr9l4arz7agmp94vm8fjwninv-glibc-utf8-locales-2.21/lib" "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4" "-L/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib/gcc/armv7l-unknown-linux-gnueabihf/4.8.4/../../.." "-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib" "-z" "combreloc" "-z" "relro" "--hash-style=both" "-z" "defs" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os" "--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map" "-soname=ld-linux-armhf.so.3" "-defsym=_begin=0" "-rpath" "/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib") ld: unrecognised emulation mode: armelf_linux_eabi --8<---------------cut here---------------end--------------->8--- Conversely, when “replaying” the command that’s used on x86_64, -rpath is not added: --8<---------------cut here---------------start------------->8--- $ GUIX_LD_WRAPPER_DEBUG=yes ld "--eh-frame-hdr" "-m" "elf_x86_64" "-shared" "-o" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new" "-L/gnu/store/xxjla3x9lv9djgszi9g2i7sp3zdh2fhz-perl-5.16.1/lib" "-L/gnu/store/zf0lrd865zxwkx30zmmv2s9pm3cbnyq9-bzip2-1.0.6/lib" "-L/gnu/store/yc75pismby9n46pimi7l9ifjwmj2ybix-xz-5.0.4/lib" "-L/gnu/store/ip9ydlmc7kwb1q472rh8539rkplx8xgl-file-5.22/lib" "-L/gnu/store/vmlwh55kmsjk7mmrw5qi8n71f02l4w0p-gawk-4.1.1/lib" "-L/gnu/store/z9d24s2wkri1z0ix5r7qqyp7zy3dklb4-binutils-2.25/lib" "-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib" "-L/gnu/store/43mpxdd1qwmlsfgnl79jy1zkkx25nz6r-glibc-utf8-locales-2.21/lib" "-L/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4" "-L/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/../../.." "-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib" "-z" "combreloc" "-z" "relro" "--hash-style=both" "-z" "defs" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os" "--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map" "-soname=ld-linux-x86-64.so.2" "-defsym=_begin=0" ld-wrapper: invoking `/gnu/store/z9d24s2wkri1z0ix5r7qqyp7zy3dklb4-binutils-2.25/bin/ld' with ("--eh-frame-hdr" "-m" "elf_x86_64" "-shared" "-o" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new" "-L/gnu/store/xxjla3x9lv9djgszi9g2i7sp3zdh2fhz-perl-5.16.1/lib" "-L/gnu/store/zf0lrd865zxwkx30zmmv2s9pm3cbnyq9-bzip2-1.0.6/lib" "-L/gnu/store/yc75pismby9n46pimi7l9ifjwmj2ybix-xz-5.0.4/lib" "-L/gnu/store/ip9ydlmc7kwb1q472rh8539rkplx8xgl-file-5.22/lib" "-L/gnu/store/vmlwh55kmsjk7mmrw5qi8n71f02l4w0p-gawk-4.1.1/lib" "-L/gnu/store/z9d24s2wkri1z0ix5r7qqyp7zy3dklb4-binutils-2.25/lib" "-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib" "-L/gnu/store/43mpxdd1qwmlsfgnl79jy1zkkx25nz6r-glibc-utf8-locales-2.21/lib" "-L/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4" "-L/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/../../.." "-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib" "-z" "combreloc" "-z" "relro" "--hash-style=both" "-z" "defs" "/tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os" "--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map" "-soname=ld-linux-x86-64.so.2" "-defsym=_begin=0") --8<---------------cut here---------------end--------------->8--- With a bit of additional debug, I can print the value of ‘libs’ in the ‘ld-wrapper’ procedure: --8<---------------cut here---------------start------------->8--- ;;; (libs ("/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib/ld-linux-armhf.so.3")) --8<---------------cut here---------------end--------------->8--- This one comes from the -dynamic-linker flag, which is not passed on x86_64. I believe this extra -dynamic-linker flag comes from a bogus ‘link’ spec on ARM, solved by this: