bug#20102: Problem with ld.so RUNPATH on armhf

[Ludovic Courtès]

Mark H Weaver <address@hidden> skribis:

> *lib:
> %{!mandroid|tno-android-ld:-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib
>  %{!static:-rpath=/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib 
> %{!static-libgcc:-rpath=/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib64
>  -rpath=/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib 
> -lgcc_s}} %{pthread:-lpthread}    %{shared:-lc}    
> %{!shared:%{mieee-fp:-lieee} 
> %{profile:-lc_p}%{!profile:-lc}};:-L/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib
>  %{!static:-rpath=/gnu/store/fbdjazgwy3zyx8qc5z4ag0j78k2d7raw-glibc-2.21/lib 
> %{!static-libgcc:-rpath=/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib64
>  -rpath=/gnu/store/fc8kqk3dazn6mcgcjxd931752b2pf3wj-gcc-4.8.4-lib/lib 
> -lgcc_s}} %{pthread:-lpthread}    %{shared:-lc}    
> %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}} %{!static: 
> -ldl}}

On x86_64 I have pretty much the same:

--8<---------------cut here---------------start------------->8---
*lib:
%{!mandroid|tno-android-ld:-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib
 %{!static:-rpath=/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib 
%{!static-libgcc:-rpath=/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib64
 -rpath=/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib -lgcc_s}} 
%{pthread:-lpthread}    %{shared:-lc}    %{!shared:%{mieee-fp:-lieee} 
%{profile:-lc_p}%{!profile:-lc}};:-L/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib
 %{!static:-rpath=/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib 
%{!static-libgcc:-rpath=/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib64
 -rpath=/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib -lgcc_s}} 
%{pthread:-lpthread}    %{shared:-lc}    %{!shared:%{mieee-fp:-lieee} 
%{profile:-lc_p}%{!profile:-lc}} %{!static: -ldl}}
--8<---------------cut here---------------end--------------->8---

‘link_command’ is also identical.

The difference between ‘glibc-final’ and (@ (gnu packages base) glibc)
(used to build glibc-utf8-locales) is that the latter is built with
‘gcc-final’, and ‘gcc-final’ always passes “-rpath $libc/lib” when
linking a shared object, as seen above.

However, when linking ld.so, -nostdlib is used, so IIUC the “lib” spec
is ignored, so the -rpath flag isn’t passed.

At least that’s what happens on x86_64: I interrupted the (@ (gnu
packages base) glibc) build on x86_64 and ran the command manually:

--8<---------------cut here---------------start------------->8---
address@hidden /tmp/nix-build-glibc-2.21.drv-0/build/elf$ strace -s 345 -f -o 
,,s gcc --verbose   -nostdlib -nostartfiles -shared -o 
/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new                \
          -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both -Wl,-z,defs       
\
          /tmp/nix-build-glibc-2.21.drv-0/build/elf/librtld.os 
-Wl,--version-script=/tmp/nix-build-glibc-2.21.drv-0/build/ld.map               
 \
          -Wl,-soname=ld-linux-x86-64.so.2                      \
          -Wl,-defsym=_begin=0

> > > > Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/libexec/gcc/x86_64-unknown-linux-gnu/4.8.4/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: 
Thread model: posix
gcc version 4.8.4 (GCC) 
COMPILER_PATH=/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/libexec/gcc/x86_64-unknown-linux-gnu/4.8.4/:/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/libexec/gcc/x86_64-unknown-linux-gnu/4.8.4/:/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/libexec/gcc/x86_64-unknown-linux-gnu/:/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/:/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/gnu/store/xxjla3x9lv9djgszi9g2i7sp3zdh2fhz-perl-5.16.1/lib/:/gnu/store/zf0lrd865zxwkx30zmmv2s9pm3cbnyq9-bzip2-1.0.6/lib/:/gnu/store/yc75pismby9n46pimi7l9ifjwmj2ybix-xz-5.0.4/lib/:/gnu/store/ip9ydlmc7kwb1q472rh8539rkplx8xgl-file-5.22/lib/:/gnu/store/vmlwh55kmsjk7mmrw5qi8n71f02l4w0p-gawk-4.1.1/lib/:/gnu/store/z9d24s2wkri1z0ix5r7qqyp7zy3dklb4-binutils-2.25/lib/:/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib/:/gnu/store/43mpxdd1qwmlsfgnl79jy1zkkx25nz6r-glibc-utf8-locales-2.21/lib/:/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/:/gnu/store/h132igxl2lkj3sbfcbknn2rd493j7d1l-gcc-4.8.4-lib/lib/gcc/x86_64-unknown-linux-gnu/4.8.4/../../../:/gnu/store/wiqbxcvzj3r35hd55yxzz919b1dv1hnv-glibc-2.21/lib
COLLECT_GCC_OPTIONS='-v' '-nostdlib' '-nostartfiles' '-shared' '-o' 
'/tmp/nix-build-glibc-2.21.drv-0/build/elf/ld.so.new' '-mtune=generic' 
'-march=x86-64'
 
/gnu/store/4sqgnc9bc1kmn058yp4xnj4vpydmfzpq-gcc-4.8.4/libexec/gcc/x86_64-unknown-linux-gnu/4.8.4/collect2
 --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---

The strace log shows that ld is not passed the -rpath flags that appear
in the “lib” spec:

--8<---------------cut here---------------start------------->8---
13261 execve("/gnu/store/crfqrvj1g3ldyhfqq8wpwqx3sd6qn4k7-ld-wrapper-0/bin/ld", 
["/gnu/store/crfqrvj1g3ldyhfqq8wpwqx3sd6qn4k7-ld-wrapper-0/bin/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"], [/* 73 vars */]
--8<---------------cut here---------------end--------------->8---

Could you try the same on armhf?

TIA,
Ludo’.