[Bug lto/45496] New: Static members of templates cause LTO to omit required code

[Bug lto/45496] New: Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

Compiling and linking these two files together should succeed.

/* BEGIN 1.cpp */
int callme();
int main(int argc, char** argv) { return callme(); }
/* END 1.cpp */

/* BEGIN 2.cpp */
template<typename T> struct holder { static int var; };
template<typename T> int holder<T>::var = 0;
int callme() { return holder<void>::var; }
/* END 2.cpp */

Indeed, compiling and linking them together without LTO succeeds. However, with
LTO, linking fails because of an undefined reference:

$ g++-4.5 -flto 1.cpp 2.cpp
/tmp/ccORg22M.lto.o: In function `main':
ccsrvz5g.o:(.text+0x10): undefined reference to `_Z6callmev'
collect2: ld returned 1 exit status


-- 
           Summary: Static members of templates cause LTO to omit required
                    code
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: alexey at feldgendler dot ru
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #2 from alexey at feldgendler dot ru  2010-09-02 11:27 -------
Created an attachment (id=21656)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21656&action=view)
TC (2.cpp)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #1 from alexey at feldgendler dot ru  2010-09-02 11:27 -------
Created an attachment (id=21655)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21655&action=view)
TC (file 1)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #3 from alexey at feldgendler dot ru  2010-09-02 11:31 -------
Output of "gcc-4.5 -v 1.cpp 2.cpp":

$ g++-4.5 -v -flto 1.cpp 2.cpp
Using built-in specs.
COLLECT_GCC=g++-4.5
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.5.1-2'
--with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.5 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-plugin --enable-gold --with-plugin-ld=ld.gold --enable-objc-gc
--with-arch-32=i586 --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.5.1 (Debian 4.5.1-2) 
COLLECT_GCC_OPTIONS='-v' '-flto' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/cc1plus -quiet -v -D_GNU_SOURCE 1.cpp
-quiet -dumpbase 1.cpp -mtune=generic -march=x86-64 -auxbase 1 -version -flto
-o /tmp/ccTWKMfh.s
GNU C++ (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/usr/include/x86_64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.5
 /usr/include/c++/4.5/x86_64-linux-gnu
 /usr/include/c++/4.5/backward
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/include
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/include-fixed
 /usr/include
End of search list.
GNU C++ (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 088ccc0edd14ed2073ed25e2d6963850
COLLECT_GCC_OPTIONS='-v' '-flto' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 as -V -Qy --64 -o /tmp/cctwxZZ0.o /tmp/ccTWKMfh.s
GNU assembler version 2.20.51 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Debian) 2.20.51-system.20100813
COLLECT_GCC_OPTIONS='-v' '-flto' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/cc1plus -quiet -v -D_GNU_SOURCE 2.cpp
-quiet -dumpbase 2.cpp -mtune=generic -march=x86-64 -auxbase 2 -version -flto
-o /tmp/ccTWKMfh.s
GNU C++ (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/usr/include/x86_64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.5
 /usr/include/c++/4.5/x86_64-linux-gnu
 /usr/include/c++/4.5/backward
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/include
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/include-fixed
 /usr/include
End of search list.
GNU C++ (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 088ccc0edd14ed2073ed25e2d6963850
COLLECT_GCC_OPTIONS='-v' '-flto' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 as -V -Qy --64 -o /tmp/ccBnOlNK.o /tmp/ccTWKMfh.s
GNU assembler version 2.20.51 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Debian) 2.20.51-system.20100813
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-flto' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/collect2 -flto --build-id --no-add-needed
--eh-frame-hdr -m elf_x86_64 --hash-style=both -dynamic-linker
/lib64/ld-linux-x86-64.so.2
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64 -L/lib/../lib64
-L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../..
/tmp/cctwxZZ0.o /tmp/ccBnOlNK.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crtn.o
collect2 version 4.5.1 (x86-64 Linux/ELF)
/usr/bin/ld --build-id --no-add-needed --eh-frame-hdr -m elf_x86_64
--hash-style=both -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64 -L/lib/../lib64
-L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../..
/tmp/cctwxZZ0.o /tmp/ccBnOlNK.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crtn.o
 /usr/bin/nm -n /usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crt1.o
 /usr/bin/nm -n /usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crti.o
 /usr/bin/nm -n /usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtbegin.o
 /usr/bin/nm -n /tmp/cctwxZZ0.o
 /usr/bin/nm -n /tmp/ccBnOlNK.o
 /usr/bin/nm -n /usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtend.o
 /usr/bin/nm -n /usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crtn.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto-wrapper /usr/bin/g++-4.5 -v -flto
-shared-libgcc -mtune=generic -march=x86-64 /tmp/cctwxZZ0.o /tmp/ccBnOlNK.o
Using built-in specs.
COLLECT_GCC=/usr/bin/g++-4.5
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.5.1-2'
--with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.5 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-plugin --enable-gold --with-plugin-ld=ld.gold --enable-objc-gc
--with-arch-32=i586 --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.5.1 (Debian 4.5.1-2) 
COLLECT_GCC_OPTIONS='-combine' '-c' '-o' '/tmp/ccBMTyip.lto.o' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-shared-libgcc'
 /usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto1 -quiet -dumpbase cctwxZZ0.o
-mtune=generic -march=x86-64 -auxbase-strip /tmp/ccBMTyip.lto.o -version
@/tmp/ccUVd5Pp -o /tmp/ccRFnsT9.s
GNU GIMPLE (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (Debian 4.5.1-2) version 4.5.1 (x86_64-linux-gnu)
        compiled by GNU C version 4.5.1, GMP version 4.3.2, MPFR version
3.0.0-p3, MPC version 0.8.2
warning: GMP header version 4.3.2 differs from library version 4.2.2.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-combine' '-c' '-o' '/tmp/ccBMTyip.lto.o' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-shared-libgcc'
 as -V -Qy --64 -o /tmp/ccBMTyip.lto.o /tmp/ccRFnsT9.s
GNU assembler version 2.20.51 (x86_64-linux-gnu) using BFD version (GNU
Binutils for Debian) 2.20.51-system.20100813
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/../lib64/:/lib/../lib64/../lib64/:/usr/lib/../lib64/../lib64/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../:/lib/:/usr/lib/:/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-combine' '-c' '-o' '/tmp/ccBMTyip.lto.o' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-shared-libgcc'
/usr/bin/ld --build-id --no-add-needed --eh-frame-hdr -m elf_x86_64
--hash-style=both -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crti.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1
-L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64 -L/lib/../lib64
-L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../..
/tmp/ccBMTyip.lto.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/4.5.1/../../../../lib64/crtn.o
/tmp/ccBMTyip.lto.o: In function `main':
cctwxZZ0.o:(.text+0x10): undefined reference to `_Z6callmev'
collect2: ld returned 1 exit status


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #4 from alexey at feldgendler dot ru  2010-09-02 11:35 -------
Created an attachment (id=21657)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21657&action=view)
Assembly for 1.cpp


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #5 from alexey at feldgendler dot ru  2010-09-02 11:35 -------
Created an attachment (id=21658)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21658&action=view)
Assembly for 2.cpp


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2010-09-02 11:38 -------
It works for me with 4.5.0, 4.5.1 and current trunk.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #7 from alexey at feldgendler dot ru  2010-09-02 11:38 -------
Created an attachment (id=21660)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21660&action=view)
Assembly after LTO for entire program


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #8 from alexey at feldgendler dot ru  2010-09-02 11:40 -------
Attached assembler files generated for 1.cpp and 2.cpp, as well as the
assembler file generated by the LTO pass. As can be seen from the latter,
_Z6callmev is referenced but not defined.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #9 from alexey at feldgendler dot ru  2010-09-02 11:57 -------
Output of lto1 without -quiet:

$ /usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto1 1.o 2.o 
Performing interprocedural optimizations
 <whole-program> <inline>Assembling functions:
 main
Execution times (seconds)
 TOTAL                 :   0.00             0.00             0.01              
1138 kB


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #10 from alexey at feldgendler dot ru  2010-09-02 11:59 -------
Created an attachment (id=21662)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21662&action=view)
-fdump-ipa-cgraph from LTO pass


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #11 from alexey at feldgendler dot ru  2010-09-02 12:04 -------
Attached cgraph dump from "/usr/lib/gcc/x86_64-linux-gnu/4.5.1/lto1
-fdump-ipa-cgraph 1.o 2.o". For some reason, though, lto1 creates only one dump
file, and that only covers its first input infile.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #12 from alexey at feldgendler dot ru  2010-09-02 12:13 -------
Could it be specific to x86_64-linux-gnu?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #13 from rguenth at gcc dot gnu dot org  2010-09-02 12:56 -------
It works for me on x86_64-linux-gnu.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #14 from alexey at feldgendler dot ru  2010-09-02 14:40 -------
Created an attachment (id=21665)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21665&action=view)
Assembly for 2.cpp

Re-uploaded 2.s.


-- 

alexey at feldgendler dot ru changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #21658|0                           |1
        is obsolete|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #15 from alexey at feldgendler dot ru  2010-09-02 14:43 -------
Created an attachment (id=21666)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21666&action=view)
Assembly for 1.cpp

Re-uploaded 1.s.


-- 

alexey at feldgendler dot ru changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #21657|0                           |1
        is obsolete|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #16 from rguenth at gcc dot gnu dot org  2010-09-02 14:45 -------
Created an attachment (id=21667)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21667&action=view)
working one


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #17 from rguenth at gcc dot gnu dot org  2010-09-02 14:46 -------
Created an attachment (id=21668)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21668&action=view)
working one


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug lto/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #18 from alexey at feldgendler dot ru  2010-09-02 14:51 -------
Further research: the LTO pass on either the affected or unaffected
installation fails if one or both .s files come from the affected installation,
but succeeds with both .s files from the unaffected installation.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #19 from rguenth at gcc dot gnu dot org  2010-09-02 15:00 -------
The important difference is

@@ -83,7 +83,7 @@
        .weak   _ZN6holderIvE3varE
        .section       
.bss._ZN6holderIvE3varE,"awG",@nobits,_ZN6holderIvE3varE,comdat
        .align 4
-       .type   _ZN6holderIvE3varE, @object
+       .type   _ZN6holderIvE3varE, @gnu_unique_object
        .size   _ZN6holderIvE3varE, 4
 _ZN6holderIvE3varE:
        .zero   4

so it seems that HAVE_GAS_GNU_UNIQUE_OBJECT / USE_GNU_UNIQUE_OBJECT in
elfos.h is broken.

Confirmed.

CCing Jason who added it.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
          Component|lto                         |middle-end
     Ever Confirmed|0                           |1
           Keywords|                            |lto
   Last reconfirmed|0000-00-00 00:00:00         |2010-09-02 15:00:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #20 from alexey at feldgendler dot ru  2010-09-02 15:13 -------
Indeed, when gcc is configured with --disable-gnu-unique-object, the bug
doesn't occur.

binutils 2.20.1-12 from Debian.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #21 from rguenth at gcc dot gnu dot org  2010-09-02 15:23 -------
Last guess in the wild is that libelf0 (from libelf) doesn't handle the
object file like it should and we somehow silently treat it as an empty one.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #22 from rguenth at gcc dot gnu dot org  2010-09-02 15:34 -------
Fixed with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161935 on trunk.

Needs backporting.  I'll do that.  Can you verify this fixes your problem?


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2010-09-02 15:00:22         |2010-09-02 15:34:25
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[alexey at feldgendler dot ru]

------- Comment #23 from alexey at feldgendler dot ru  2010-09-02 15:55 -------
Yes, the patch fixes the observed bug. Thanks a lot!

However, there's also the issue of missing error reporting for a failure to
read ELF. I don't know if it should be fixed as part of this bug or separately.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #24 from rguenth at gcc dot gnu dot org  2010-09-03 09:47 -------
Fixed for 4.5.2.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.5.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496

[Bug middle-end/45496] Static members of templates cause LTO to omit required code

[rguenth at gcc dot gnu dot org]

------- Comment #25 from rguenth at gcc dot gnu dot org  2010-09-03 09:48 -------
Subject: Bug 45496

Author: rguenth
Date: Fri Sep  3 09:47:09 2010
New Revision: 163801

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=163801
Log:
2010-09-03  Richard Guenther  <rguenther@suse.de>

        * lto-elf.c (validate_file): Always error if validation fails.

2010-09-03  Richard Guenther  <rguenther@suse.de>

        PR lto/45496
        Backport from mainline
        2010-07-07  Jakub Jelinek  <jakub@redhat.com>

        * lto-elf.c (ELFOSABI_NONE, ELFOSABI_LINUX): Define if not defined.
        (validate_file): Allow merging of ELFOSABI_NONE with ELFOSABI_LINUX
        objects.

Modified:
    branches/gcc-4_5-branch/gcc/lto/ChangeLog
    branches/gcc-4_5-branch/gcc/lto/lto-elf.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45496