Ubuntu
gcc-4.6 package

undefined reference to `pow' when building with -flto

Bug #778292 reported by Steve Langasek
32
This bug affects 6 people
Affects Status Importance Assigned to Milestone
binutils
Fix Released
Medium
gcc
Invalid
Medium
binutils (Ubuntu)
Fix Released
Medium
Unassigned
Oneiric
Fix Released
Medium
Unassigned
gcc-4.6 (Ubuntu)
Invalid
Medium
Unassigned
Oneiric
Invalid
Medium
Unassigned

Bug Description

Binary package hint: gcc-4.6

cairo fails to build in oneiric, because linking with -flto results in an undefined reference:

/bin/bash ../../libtool --tag=CC --mode=link gcc -D_REENTRANT -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -Wall -Wextra -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Werror-implicit-function-declaration -Wnested-externs -Wpointer-arith -Wwrite-strings -Wsign-compare -Wstrict-prototypes -Wmissing-prototypes -Wpacked -Wswitch-enum -Wmissing-format-attribute -Wbad-function-cast -Wvolatile-register-var -Wstrict-aliasing=2 -Winit-self -Wunsafe-loop-optimizations -Wno-missing-field-initializers -Wno-unused-parameter -Wno-attributes -Wno-long-long -Winline -Wlogical-op -fno-strict-aliasing -fno-common -flto -Wp,-D_FORTIFY_SOURCE=2 -DXCB_GENERIC_ERROR_HAS_MAJOR_MINOR_CODES -g -O2 -Wall -g -version-info 11002:2:11000 -no-undefined -Wl,-Bsymbolic-functions -Wl,-z,defs -Wl,-O1 -Wl,--as-needed -o libcairo-script-interpreter.la -rpath /usr/lib/x86_64-linux-gnu libcairo_script_interpreter_la-cairo-script-file.lo libcairo_script_interpreter_la-cairo-script-hash.lo libcairo_script_interpreter_la-cairo-script-interpreter.lo libcairo_script_interpreter_la-cairo-script-objects.lo libcairo_script_interpreter_la-cairo-script-operators.lo libcairo_script_interpreter_la-cairo-script-scanner.lo libcairo_script_interpreter_la-cairo-script-stack.lo ../../src/libcairo.la -lpthread -lpixman-1 -L/usr/lib/x86_64-linux-gnu -lfontconfig -L/usr/lib/x86_64-linux-gnu -lfreetype -L/usr/lib/x86_64-linux-gnu -lpng12 -L/usr/lib/x86_64-linux-gnu -lxcb-shm -lxcb -L/usr/lib/x86_64-linux-gnu -lxcb-render -lxcb -L/usr/lib/x86_64-linux-gnu -lXrender -lX11 -L/usr/lib/x86_64-linux-gnu -lX11 -lz -lz -lz -lm
libtool: link: gcc -shared -fPIC -DPIC .libs/libcairo_script_interpreter_la-cairo-script-file.o .libs/libcairo_script_interpreter_la-cairo-script-hash.o .libs/libcairo_script_interpreter_la-cairo-script-interpreter.o .libs/libcairo_script_interpreter_la-cairo-script-objects.o .libs/libcairo_script_interpreter_la-cairo-script-operators.o .libs/libcairo_script_interpreter_la-cairo-script-scanner.o .libs/libcairo_script_interpreter_la-cairo-script-stack.o -Wl,-rpath -Wl,/build/buildd/cairo-1.10.2/debian/build/main/src/.libs -Wl,--as-needed ../../src/.libs/libcairo.so -lpthread -lpixman-1 -L/usr/lib/x86_64-linux-gnu -lfontconfig /usr/lib/x86_64-linux-gnu/libfreetype.so -lpng12 -lxcb-shm -lxcb-render -lxcb -lXrender -lX11 -lz -lm -flto -O2 -Wl,-Bsymbolic-functions -Wl,-z -Wl,defs -Wl,-O1 -Wl,-soname -Wl,libcairo-script-interpreter.so.2 -o .libs/libcairo-script-interpreter.so.2.11000.2
/tmp/ccbzCZUW.ltrans11.ltrans.o: In function `_csi_parse_number':
ccbzCZUW.ltrans11.o:(.text+0x1074): undefined reference to `pow'
collect2: ld returned 1 exit status
/tmp/ccJCGA7g.ltrans11.ltrans.o: In function `_csi_parse_number':
ccJCGA7g.ltrans11.o:(.text+0x1074): undefined reference to `pow'
collect2: ld returned 1 exit status

https://launchpad.net/ubuntu/+source/cairo/1.10.2-2ubuntu3/+buildjob/2530315

Given that -lm is being explicitly passed, and pow is a symbol provided by libm, that looks like a bug in gcc to me?

Running the same command without -flto works just fine.

Related branches

lp:ubuntu/oneiric/binutils
Matthias Klose (doko)
Changed in gcc-4.6 (Ubuntu):
importance: Undecided → Medium
status: New → Confirmed
Revision history for this message
Matthias Klose (doko) wrote :

only seen with the combination of -Wl,--as-needed and -flto

Revision history for this message
Lorenzo Pistone (mrpisto) wrote :

might be related with the problem I encounter in compiling Cube 2: Sauerbraten with -flto[=n]:

/usr/bin/ld: /tmp/cc5LO1Ap.ltrans14.ltrans.o: undefined reference to symbol 'cosf@@GLIBC_2.2.5'
/usr/bin/ld: note: 'cosf@@GLIBC_2.2.5' is defined in DSO /usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.6.1/../../../libm.so so try adding it to the linker command line
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.6.1/../../../libm.so: could not read symbols: Invalid operation

some people say that adding -lm at the end of the linker command fixes it, but it's not the case here. Of course, compiling goes fine without -flto.

Revision history for this message
abma (abma) wrote :

i get a similar error when compiling spring rts:

/usr/lib/x86_64-linux-gnu/libieee.a:(.data+0x0): multiple definition of `_LIB_VERSION'
/usr/lib/x86_64-linux-gnu/libieee.a:(.data+0x0): first defined here
/usr/bin/ld: /tmp/cc6IDeOO.ltrans12.ltrans.o: undefined reference to symbol 'tan@@GLIBC_2.2.5'
/usr/bin/ld: note: 'tan@@GLIBC_2.2.5' is defined in DSO /usr/lib/x86_64-linux-gnu/libm.so so try adding it to the linker command line
/usr/lib/x86_64-linux-gnu/libm.so: could not read symbols: Invalid operation
collect2: ld returned 1 exit status

without flto it compiles fine.

Revision history for this message
Otus (jan-varho) wrote :

I have a simple test case. Compiling the attached program without -flto works:

gcc -o test-flto test-flto.c -lm

But with -flto an error is reported:

gcc -flto -o test-flto test-flto.c -lm

This is with gcc 4.6.1-7ubuntu1 - OTOH the gcc 4.5 from Natty compiles both successfully.

Revision history for this message
In , Krisztian-kocsis-0 (krisztian-kocsis-0) wrote :

Created attachment 25250
Verbose linker output.

When I try to build udev with gcc-4.6.1, the accelerometer module fails to link because of undefined references to sqrt, atan, etc. Unfortunately -lm is explicitly specified. If I remove -flto or -Wl,--as-needed, the module links successfully.

Verbose linker output is attached.

Revision history for this message
In , Doko-v (doko-v) wrote :

$ cat test-flto.c
#include <math.h>
#include <stdio.h>

int main()
{
        printf("%le\n", gamma(42));
        return 0;
}

$ gcc -Wl,--as-needed -flto test-flto.c -lm
/tmp/ccXjDUDX.ltrans0.ltrans.o: In function `main':
ccXjDUDX.ltrans0.o:(.text+0xd): undefined reference to `gamma'
collect2: ld returned 1 exit status

$ gcc -B/usr/lib/gold-ld/ -Wl,--as-needed -flto -o test-flto test-flto.c -lm
does work

Revision history for this message
In , Matthias Klose (doko) wrote :

$ cat test-flto.c
#include <math.h>
#include <stdio.h>

int main()
{
        printf("%le\n", gamma(42));
        return 0;
}

$ gcc -Wl,--as-needed -flto test-flto.c -lm
/tmp/ccXjDUDX.ltrans0.ltrans.o: In function `main':
ccXjDUDX.ltrans0.o:(.text+0xd): undefined reference to `gamma'
collect2: ld returned 1 exit status

$ gcc -B/usr/lib/gold-ld/ -Wl,--as-needed -flto -o test-flto test-flto.c -lm
does work

see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50367

Revision history for this message
In , Doko-v (doko-v) wrote :

http://sourceware.org/bugzilla/show_bug.cgi?id=13201

Bug Watch Updater (bug-watch-updater)
Changed in gcc:
importance: Unknown → Medium
status: Unknown → New
Revision history for this message
In , Alan Modra (amodra-gmail) wrote :

Not a gcc bug.

Revision history for this message
In , Alan Modra (amodra-gmail) wrote :

http://sourceware.org/ml/binutils-cvs/2011-09/msg00071.html

Bug Watch Updater (bug-watch-updater)
Changed in binutils:
importance: Unknown → Medium
status: Unknown → Fix Released
Matthias Klose (doko)
Changed in binutils (Ubuntu):
importance: Undecided → Medium
status: New → Confirmed
Changed in gcc-4.6 (Ubuntu Oneiric):
status: Confirmed → Invalid
Changed in binutils (Ubuntu Oneiric):
status: Confirmed → In Progress
Revision history for this message
matt_hargett (matt-use) wrote :

I really need this fix to continue performance/size benchmarking on LTO-compiled libraries/binaries. Any estimates on when the released fix will be integrated and available via the public apt repo?

Thanks!

Bug Watch Updater (bug-watch-updater)
Changed in gcc:
status: New → Invalid
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package binutils - 2.21.53.20110810-0ubuntu3

---------------
binutils (2.21.53.20110810-0ubuntu3) oneiric; urgency=low

  * Fix PR ld/13201, link error with --as-needed and -flto. LP: #778292.
    LP: #690194.
 -- Matthias Klose <email address hidden> Tue, 20 Sep 2011 11:34:33 +0200

Changed in binutils (Ubuntu Oneiric):
status: In Progress → Fix Released
Revision history for this message
In , Hjl-tools (hjl-tools) wrote :

*** Bug 13182 has been marked as a duplicate of this bug. ***

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