CODEWITHSUNDEEP
escapingrpmrpm-specrpath
pythonic metaphor
pythonic metaphor

Reputation: 10546

Escaping in rpm spec file

I am trying to set the rpath in my spec file with a statement like

export LDFLAGS="-Wl-rpath=$ORIGIN/../lib"

But I can't correctly escape "$ORIGIN". I need the command to gcc to contain the string "$ORIGIN", not expand it anywhere along the line. I tried

\\\$ORIGIN
$$ORIGIN
\$\$ORIGIN
\\$\\$ORIGIN
\\\\\\$ORIGIN
\\\\\\\\$ORIGIN

and a few others with no success. What's the right sequence of escape characters?

Upvotes: 5

Views: 2832

Answers (2)

jayhendren
jayhendren

Reputation: 4511

I managed to figure this one out. I used curl-7.19.7 for testing. From the command line, the following was sufficient to get make to pass $ORIGIN through to the compiler:

export LDFLAGS='-Wl,-rpath=\$$ORIGIN/../lib'
./configure --prefix=/tmp/curl
make
make install

and I verified using readelf --dynamic /tmp/curl/bin/curl.

However, from a specfile, I needed to escape the backslash an extra time. Here is what worked from the %build section of the specfile for me:

%define ldflags LDFLAGS='-Wl,-rpath=\\$$ORIGIN/../lib'
%configure --enable-shared %{ldflags}
make %{?_smp_mflags}

To verify, here is the output from readelf:

[faceplant ~/rpmbuild/specs]% readelf --dynamic ../buildroot/sis-curl-7.19.7-2.el6.x86_64/usr/local/curl-7.19.7/bin/curl

Dynamic section at offset 0x1c028 contains 26 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libcurl.so.4]
 0x0000000000000001 (NEEDED)             Shared library: [libssl.so.1.0.0]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.1.0.0]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000f (RPATH)              Library rpath: [$ORIGIN/../lib:/usr/local/curl-7.19.7/lib]
 0x000000000000000c (INIT)               0x401b98
 0x000000000000000d (FINI)               0x40b2f8
 0x000000006ffffef5 (GNU_HASH)           0x400260
 0x0000000000000005 (STRTAB)             0x400cb0
 0x0000000000000006 (SYMTAB)             0x4002c0
 0x000000000000000a (STRSZ)              1229 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x61c220
 0x0000000000000002 (PLTRELSZ)           2160 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x401328
 0x0000000000000007 (RELA)               0x4012c8
 0x0000000000000008 (RELASZ)             96 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffe (VERNEED)            0x401258
 0x000000006fffffff (VERNEEDNUM)         2
 0x000000006ffffff0 (VERSYM)             0x40117e
 0x0000000000000000 (NULL)               0x0

As you can see, $ORIGIN/../lib made it into the RPATH field unscathed.

Hopefully this works for you.

(P.S. please ignore the /usr/local/<package>-<version> prefixes. This is just a packaging method I've been experimenting with in order to meet some packaging needs for my organization.)

Upvotes: 2

Etan Reisner
Etan Reisner

Reputation: 80921

Alright. I did some quick testing and I believe I figured out what you need to do.

Try using one of the following:

export LDFLAGS="-Wl,-rpath=\\$\$ORIGIN/../lib"

or

export LDFLAGS="-Wl,-rpath="'\$$ORIGIN'"/../lib"

Upvotes: 2

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