[Bug gold/20996] New: build error with -O3

[markus at trippelsdorf dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=20996

            Bug ID: 20996
           Summary: build error with -O3
           Product: binutils
           Version: 2.29 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: markus at trippelsdorf dot de
                CC: ian at airs dot com
  Target Milestone: ---

gold doesn't build with gcc-trunk and -O3:

...
x86_64-pc-linux-gnu-g++ -W -Wall    -Wstack-usage=262144 -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -frandom-seed=dwp  -flifetime-dse=1 -fnull-this-pointer
-DBOOST_ERROR_CODE_HEAD
ER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED -march=amdfam10 -O3 -pipe 
-Wl,--no-demangle,--hash-style=gnu,--as-needed,--gc-sections,--icf=safe -o dwp
dwp.o libgold.a ../libiberty/libiber
ty.a   -lpthread -ldl -lz -ldl                                                  
dwp.o:dwp.cc:function _ZN4gold16Sized_relobj_dwoILi32ELb1EE5setupEv: error:
undefined reference to
'_ZN4gold28build_compressed_section_mapILi32ELb1EEEPSt3mapIjNS_23Compressed_sect
ion_infoESt4lessIjESaISt4pairIKjS2_EEEPKhjPKcmPNS_6ObjectEb'                    
dwp.o:dwp.cc:function _ZN4gold16Sized_relobj_dwoILi32ELb0EE5setupEv: error:
undefined reference to
'_ZN4gold28build_compressed_section_mapILi32ELb0EEEPSt3mapIjNS_23Compressed_sect
ion_infoESt4lessIjESaISt4pairIKjS2_EEEPKhjPKcmPNS_6ObjectEb'                    
dwp.o:dwp.cc:function _ZN4gold16Sized_relobj_dwoILi64ELb1EE5setupEv: error:
undefined reference to
'_ZN4gold28build_compressed_section_mapILi64ELb1EEEPSt3mapIjNS_23Compressed_sect
ion_infoESt4lessIjESaISt4pairIKjS2_EEEPKhjPKcmPNS_6ObjectEb'                    
dwp.o:dwp.cc:function _ZN4gold16Sized_relobj_dwoILi64ELb0EE5setupEv: error:
undefined reference to
'_ZN4gold28build_compressed_section_mapILi64ELb0EEEPSt3mapIjNS_23Compressed_sect
ion_infoESt4lessIjESaISt4pairIKjS2_EEEPKhjPKcmPNS_6ObjectEb'                    
collect2: error: ld returned 1 exit status  

It looks like the template function Compressed_section_map*
build_compressed_section_map() needs to be explicitly instantiated in
object.cc.
Otherwise it will get optimized away.

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