• Mike Frysinger's avatar
    perf tools: Fix -ldw/-lelf link test when static linking · d14c4965
    Mike Frysinger authored
    Since libelf sometimes uses libpthread, we have to list that after -lelf
    when someone tries to build statically.  Else things go boom:
    
    Makefile:479: *** No libelf.h/libelf found, please install \
    	libelf-dev/elfutils-libelf-devel.  Stop.
    
    Similarly, the -ldw test fails as it often uses -lz:
    
    Makefile:462: No libdw.h found or old libdw.h found or elfutils is older \
    	than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev
    
    And if we add debugging to try-cc, we see:
    + echo '#include <dwarf.h>
    
    int main(void)
    {
            Dwarf *dbg = dwarf_begin(0, DWARF_C_READ);
            return (long)dbg;
    }'
    + i686-pc-linux-gnu-gcc -x c - -O2 -pipe -march=atom -mtune=atom -mfpmath=sse -g \
    	-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE \
    	-ldw -lelf -static -lpthread -lrt -lelf -lm -o .24368
    /usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error: undefined reference to 'inflateInit_'
    /usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error: undefined reference to 'inflate'
    /usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error: undefined reference to 'inflateReset'
    /usr/lib/libdw.a(dwarf_begin_elf.o):function check_section.isra.1: error: undefined reference to 'inflateEnd'
    
    + echo '#include <libelf.h>
    
    int main(void)
    {
            Elf *elf = elf_begin(0, ELF_C_READ, 0);
            return (long)elf;
    }'
    + i686-pc-linux-gnu-gcc -x c - -O2 -pipe -march=atom -mtune=atom -mfpmath=sse -g \
    	-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE \
    	-static -lpthread -lrt -lelf -lm -o .19216
    /usr/lib/libelf.a(elf_begin.o):function file_read_elf: error: undefined reference to 'pthread_rwlock_init'
    /usr/lib/libelf.a(elf_begin.o):function __libelf_read_mmaped_file: error: undefined reference to 'pthread_rwlock_init'
    /usr/lib/libelf.a(elf_begin.o):function __libelf_read_mmaped_file: error: undefined reference to 'pthread_rwlock_init'
    /usr/lib/libelf.a(elf_begin.o):function read_file: error: undefined reference to 'pthread_rwlock_init'
    /usr/lib/libelf.a(elf_begin.o):function lock_dup_elf.8072: error: undefined reference to 'pthread_rwlock_unlock'
    /usr/lib/libelf.a(elf_begin.o):function lock_dup_elf.8072: error: undefined reference to 'pthread_rwlock_wrlock'
    /usr/lib/libelf.a(elf_begin.o):function elf_begin: error: undefined reference to 'pthread_rwlock_rdlock'
    /usr/lib/libelf.a(elf_begin.o):function elf_begin: error: undefined reference to 'pthread_rwlock_unlock'
    Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1368073064-18276-1-git-send-email-vapier@gentoo.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    d14c4965
Makefile 14.1 KB