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config/kernel/linux.in.2
author "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
Fri Jan 27 13:31:16 2012 +0100 (2012-01-27)
changeset 2854 a70abdbfa342
parent 2446 d902cd77419f
permissions -rw-r--r--
complibs/cloog: fix linking with libm

In Ubuntu 11.04 and 11.10, the default options for ld have changed.
--no-copy-dt-needed-entries and --as-needed are now enabled by default, which
causes errors like:

[EXTRA] Checking CLooG/ppl
[DEBUG] ==> Executing: 'make' '-j3' '-s' 'check'
[ALL ] Making check in .
[ALL ] config.status: creating include/cloog/cloog-config.h
[ALL ] config.status: include/cloog/cloog-config.h is unchanged
[ALL ] libtool: link: i686-build_pc-linux-gnu-gcc -Wall -fomit-frame-pointer
-pipe -o cloog cloog.o -L/<snip>/build/static/lib ./.libs/libcloog.a -lm
/<snip>/build/static/lib/libppl_c.a /<snip>/build/static/lib/libpwl.a
/<snip>/build/static/lib/libppl.a /<snip>/build/static/lib/libgmpxx.a
/<snip>/build/static/lib/libgmp.a -lstdc++
[ALL ] /usr/bin/ld: /<snip>/build/static/lib/libppl.a(MIP_Problem.o):
undefined reference to symbol 'sqrt@@GLIBC_2.0'
[ALL ] /usr/bin/ld: note: 'sqrt@@GLIBC_2.0' is defined in DSO
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so so try adding
it to the linker command line
[ALL ] /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so:
could not read symbols: Invalid operation
[ALL ] collect2: ld returned 1 exit status
[ERROR] make[2]: *** [cloog] Error 1
[ERROR] make[1]: *** [check-recursive] Error 1

See:
https://wiki.ubuntu.com/NattyNarwhal/ToolchainTransition

This patch fixes these errors by placing '-lm' at the right place on the command
line as libppl requires libm when linking cloog.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com> 
     1 # Linux kernel options

     2 

     3 if ! KERNEL_LINUX_USE_CUSTOM_HEADERS

     4 

     5 choice

     6     bool

     7     prompt "Kernel verbosity:"

     8     default KERNEL_LINUX_VERBOSITY_0

     9 

    10 config KERNEL_LINUX_VERBOSITY_0

    11     bool

    12     prompt "Simplified"

    13     help

    14       Print simplified command lines.

    15 

    16 config KERNEL_LINUX_VERBOSITY_1

    17     bool

    18     prompt "Full commands"

    19     help

    20       Print full command lines.

    21 

    22 config KERNEL_LINUX_VERBOSITY_2

    23     bool

    24     prompt "Exec reasons"

    25     help

    26       Print the reasons why a make target is rebuild.

    27 

    28 endchoice

    29 

    30 config KERNEL_LINUX_VERBOSE_LEVEL

    31     int

    32     default 0 if KERNEL_LINUX_VERBOSITY_0

    33     default 1 if KERNEL_LINUX_VERBOSITY_1

    34     default 2 if KERNEL_LINUX_VERBOSITY_2

    35 

    36 config KERNEL_LINUX_INSTALL_CHECK

    37     bool

    38     prompt "Check installed headers"

    39     default y

    40     help

    41       If you are in doubt that installed headers are buggy, say 'Y'

    42       here to have an extra check passed onto the headers.

    43 

    44 endif # ! KERNEL_LINUX_USE_CUSTOM_HEADERS
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