kconfig/kconfig.mk
author "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
Fri Jan 27 13:31:16 2012 +0100 (2012-01-27)
changeset 2854 a70abdbfa342
parent 2650 4d299836e994
child 2981 80151a249b85
child 3006 1c9e4e6a6922
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>
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# ===========================================================================
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# crosstool-NG configuration targets
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# These targets are used from top-level makefile
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#-----------------------------------------------------------
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# The configurators rules
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configurators = menuconfig nconfig oldconfig
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PHONY += $(configurators)
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$(configurators): config_files
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CONF  := $(CT_LIB_DIR)/kconfig/conf
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MCONF := $(CT_LIB_DIR)/kconfig/mconf
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NCONF := $(CT_LIB_DIR)/kconfig/nconf
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menuconfig:
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	@$(ECHO) "  CONF  $(KCONFIG_TOP)"
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	$(SILENT)$(MCONF) $(KCONFIG_TOP)
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nconfig:
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	@$(ECHO) "  CONF  $(KCONFIG_TOP)"
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	$(SILENT)$(NCONF) $(KCONFIG_TOP)
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oldconfig: .config
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	@$(ECHO) "  CONF  $(KCONFIG_TOP)"
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	$(SILENT)$(CONF) --silent$@ $(KCONFIG_TOP)
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# Always be silent, the stdout an be >.config
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extractconfig:
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	@awk 'BEGIN { dump=0; }                                                 \
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	      dump==1 && $$0~/^\[.....\][[:space:]]+(# |)CT_/ {                 \
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	          $$1="";                                                       \
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	          gsub("^[[:space:]]","");                                      \
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	          print;                                                        \
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	      }                                                                 \
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	      $$0~/Dumping user-supplied crosstool-NG configuration: done in/ { \
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	          dump=0;                                                       \
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	      }                                                                 \
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	      $$0~/Dumping user-supplied crosstool-NG configuration$$/ {        \
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	          dump=1;                                                       \
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	      }'
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#-----------------------------------------------------------
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# Help text used by make help
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help-config::
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	@echo  '  menuconfig         - Update current config using a menu based program'
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	@echo  '  oldconfig          - Update current config using a provided .config as base'
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	@echo  '  extractconfig      - Extract to stdout the configuration items from a'
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	@echo  '                       build.log file piped to stdin'