#7062: Spurious undefined reference to `openpty'
---------------------------------+------------------------------------------
Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: high | Milestone: 7.6.1
Component: Compiler | Version: 7.4.2
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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I'm seeing these since upgrading our build machines from Ubuntu 10.04 to
12.04:
{{{
=====> process001(dyn) 3159 of 3394 [0, 96, 0]
cd ../../libraries/process/tests && '/64playpen/simonmar/nightly/HEAD-
cam-04-unx/x86_64-unknown-linux/inplace/bin/ghc-stage2' -fforce-recomp
-dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts
-fno-ghci-history -o process001 process001.hs -O -dynamic
>process001.comp.stderr 2>&1
Compile failed (status 256) errors were:
[1 of 1] Compiling Main ( process001.hs, process001.o )
Linking process001 ...
/64playpen/simonmar/nightly/HEAD-cam-04-unx/x86_64-unknown-
linux/libraries/unix/dist-
install/build/libHSunix-2.5.1.0-ghc7.5.20120706.so: undefined reference to
`openpty'
collect2: ld returned 1 exit status
*** unexpected failure for process001(dyn)
}}}
I'm stumped. Here's what I've discovered so far:
* It only happens with `-dynamic`
* The `openpty` symbol comes from the `util` library, which we are
correctly linking in. The `libutil.so` library is present, and I've
checked that we're getting the right one.
* It only happens when using the `process` package, which depends on
`unix`. Using `unix` by itself is fine. So something about the `process`
package is messing up the linker.
* I've tried removing all the `-L` options and linking libraries by full
pathname, just in case we're picking up something from the wrong place;
that doesn't help.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7062>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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