[Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators

[Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators

[t.poechtrager at gmail dot com]

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65544

Thomas Pöchtrager <t.poechtrager at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |4.9.2

--- Comment #1 from Thomas Pöchtrager <t.poechtrager at gmail dot com> ---
Sorry, the MinGW version has ben cut, it's

gcc version 4.9.2 (GCC)
>From gcc-bugs-return-481495-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Mar 24 18:48:23 2015
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/65542] [4.8/4.9/5 Regression] SPREAD intrinsic incorrectly accepted in initialization expressions with -stdù5
Date: Tue, 24 Mar 2015 19:37:00 -0000
X-Bugzilla-Reason: CC
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X-Bugzilla-Who: dominiq at lps dot ens.fr
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide542

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-24
            Summary|SPREAD intrinsic            |[4.8/4.9/5 Regression]
                   |incorrectly accepted in     |SPREAD intrinsic
                   |initialization expressions  |incorrectly accepted in
                   |with -stdù5               |initialization expressions
                   |                            |with -stdù5
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The code is rejected with gcc version 4.4.7:

pr65542.f90:2.21:

integer :: ibug(42) = spread(42, 1, 42)
                     1
Error: transformational intrinsic 'spread' at (1) is not permitted in an
initialization expression

but accepted starting at gcc version 4.5.4.

[Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65544

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you verify if the cross compiler uses a linker-plugin by specifying
-fuse-linker-plugin?  Without that errors like this are unfortunately expected.

[Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators

[t.poechtrager at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65544

--- Comment #3 from Thomas Pöchtrager <t.poechtrager at gmail dot com> ---
(In reply to Richard Biener from comment #2)
> Can you verify if the cross compiler uses a linker-plugin by specifying
> -fuse-linker-plugin?  Without that errors like this are unfortunately
> expected.

The problem persits with -fuse-linker-plugin.

$ i686-w64-mingw32-g++ test.cpp -fuse-linker-plugin -flto -static-libstdc++ -v
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/lto-wrapper
Target: i686-w64-mingw32
Configured with: ../configure --prefix=/opt/compiler/mingw-w64
--target=i686-w64-mingw32 --with-gnu-ld --with-gnu-as
--enable-languages=c,c++,lto --disable-multilib --enable-lto
--enable-threads=posix
Thread model: posix
gcc version 4.9.2 (GCC) 
COLLECT_GCC_OPTIONS='-fuse-linker-plugin' '-flto' '-v' '-shared-libgcc'
'-mtune=generic' '-march=pentiumpro'
 /opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/cc1plus -quiet -v
-D_REENTRANT test.cpp -quiet -dumpbase test.cpp -mtune=generic
-march=pentiumpro -auxbase test -version -fuse-linker-plugin -flto -o
/tmp/ccnj4m7D.s
GNU C++ (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/sys-include"
#include "..." search starts here:
#include <...> search starts here:

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/include/c++/4.9.2

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/include/c++/4.9.2/i686-w64-mingw32

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/include/c++/4.9.2/backward
 /opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/include
 /opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/include-fixed

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/include
End of search list.
GNU C++ (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: a4174c607d6c7ea8e319dc3ef635686f
COLLECT_GCC_OPTIONS='-fuse-linker-plugin' '-flto' '-v' '-shared-libgcc'
'-mtune=generic' '-march=pentiumpro'

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/as
-v -o /tmp/ccy6gCyh.o /tmp/ccnj4m7D.s
GNU assembler version 2.25 (i686-w64-mingw32) using BFD version (GNU Binutils)
2.25
COMPILER_PATH=/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/
LIBRARY_PATH=/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/
COLLECT_GCC_OPTIONS='-fuse-linker-plugin' '-flto' '-v' '-shared-libgcc'
'-mtune=generic' '-march=pentiumpro'
 /opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/collect2 -plugin
/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/liblto_plugin.so
-plugin-opt=/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/lto-wrapper
-plugin-opt=-fresolution=/tmp/ccFrtw0U.res -plugin-opt=-pass-through=-lmingw32
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lmoldname -plugin-opt=-pass-through=-lmingwex
-plugin-opt=-pass-through=-lmsvcrt -plugin-opt=-pass-through=-lpthread
-plugin-opt=-pass-through=-ladvapi32 -plugin-opt=-pass-through=-lshell32
-plugin-opt=-pass-through=-luser32 -plugin-opt=-pass-through=-lkernel32
-plugin-opt=-pass-through=-lmingw32 -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lmoldname
-plugin-opt=-pass-through=-lmingwex -plugin-opt=-pass-through=-lmsvcrt -flto -m
i386pe -Bdynamic
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/crt2.o
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/crtbegin.o
-L/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2
-L/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib
-L/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib
/tmp/ccy6gCyh.o -Bstatic -lstdc++ -Bdynamic -lmingw32 -lgcc_s -lgcc -lmoldname
-lmingwex -lmsvcrt -lpthread -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32
-lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/crtend.o
 i686-w64-mingw32-g++ @/tmp/ccZ86xan.args
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-g++
Target: i686-w64-mingw32
Configured with: ../configure --prefix=/opt/compiler/mingw-w64
--target=i686-w64-mingw32 --with-gnu-ld --with-gnu-as
--enable-languages=c,c++,lto --disable-multilib --enable-lto
--enable-threads=posix
Thread model: posix
gcc version 4.9.2 (GCC) 
COLLECT_GCC_OPTIONS='-c' '-fexceptions' '-fno-trapv' '-fno-strict-overflow'
'-mtune=generic' '-march=pentiumpro' '-fuse-linker-plugin' '-v'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
'-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out' '-fwpa'
'-fresolution=/tmp/ccFrtw0U.res' '-shared-libgcc'
 /opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/lto1 -quiet
-dumpbase ccy6gCyh.o -mtune=generic -march=pentiumpro -mtune=generic
-march=pentiumpro -auxbase ccy6gCyh -version -fexceptions -fno-trapv
-fno-strict-overflow -fuse-linker-plugin
-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out -fwpa
-fresolution=/tmp/ccFrtw0U.res @/tmp/ccQ6SiBJ
GNU GIMPLE (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COMPILER_PATH=/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/
LIBRARY_PATH=/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/
COLLECT_GCC_OPTIONS='-c' '-fexceptions' '-fno-trapv' '-fno-strict-overflow'
'-mtune=generic' '-march=pentiumpro' '-fuse-linker-plugin' '-v'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
'-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out' '-fwpa'
'-fresolution=/tmp/ccFrtw0U.res' '-shared-libgcc'
 i686-w64-mingw32-g++ @/tmp/ccLYvNbE.args
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-g++
Target: i686-w64-mingw32
Configured with: ../configure --prefix=/opt/compiler/mingw-w64
--target=i686-w64-mingw32 --with-gnu-ld --with-gnu-as
--enable-languages=c,c++,lto --disable-multilib --enable-lto
--enable-threads=posix
Thread model: posix
gcc version 4.9.2 (GCC) 
COLLECT_GCC_OPTIONS='-c' '-fexceptions' '-fno-trapv' '-fno-strict-overflow'
'-mtune=generic' '-march=pentiumpro' '-fuse-linker-plugin' '-v'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
'-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out' '-fltrans' '-o'
'/tmp/cc3wRNFJ.ltrans0.ltrans.o' '-shared-libgcc'
 /opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/lto1 -quiet
-dumpbase cc3wRNFJ.ltrans0.o -mtune=generic -march=pentiumpro -mtune=generic
-march=pentiumpro -auxbase-strip /tmp/cc3wRNFJ.ltrans0.ltrans.o -version
-fexceptions -fno-trapv -fno-strict-overflow -fuse-linker-plugin
-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out -fltrans @/tmp/ccMz2RJJ -o
/tmp/ccXAazgn.s
GNU GIMPLE (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 4.9.2 (i686-w64-mingw32)
        compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-c' '-fexceptions' '-fno-trapv' '-fno-strict-overflow'
'-mtune=generic' '-march=pentiumpro' '-fuse-linker-plugin' '-v'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
'-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out' '-fltrans' '-o'
'/tmp/cc3wRNFJ.ltrans0.ltrans.o' '-shared-libgcc'

/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/as
-v -o /tmp/cc3wRNFJ.ltrans0.ltrans.o /tmp/ccXAazgn.s
GNU assembler version 2.25 (i686-w64-mingw32) using BFD version (GNU Binutils)
2.25
COMPILER_PATH=/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/libexec/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/
LIBRARY_PATH=/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/:/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/
COLLECT_GCC_OPTIONS='-c' '-fexceptions' '-fno-trapv' '-fno-strict-overflow'
'-mtune=generic' '-march=pentiumpro' '-fuse-linker-plugin' '-v'
'-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
'-fltrans-output-list=/tmp/cc3wRNFJ.ltrans.out' '-fltrans' '-o'
'/tmp/cc3wRNFJ.ltrans0.ltrans.o' '-shared-libgcc'
`__ZdlPv' referenced in section `.text$_ZNSt9exceptionD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_exception.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section `.text$_ZNSt13bad_exceptionD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_exception.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section `.text$_ZN10__cxxabiv115__forced_unwindD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_exception.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section
`.text$_ZN10__cxxabiv119__foreign_exceptionD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_exception.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section
`.text$_ZN9__gnu_cxx24__concurrence_lock_errorD0Ev[__ZN9__gnu_cxx24__concurrence_lock_errorD0Ev]'
of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_alloc.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section
`.text$_ZN9__gnu_cxx26__concurrence_unlock_errorD0Ev[__ZN9__gnu_cxx26__concurrence_unlock_errorD0Ev]'
of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(eh_alloc.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section
`.text$_ZN10__cxxabiv120__si_class_type_infoD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(si_class_type_info.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section `.text$_ZNSt9type_infoD0Ev' of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(tinfo.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
`__ZdlPv' referenced in section `.text$_ZN10__cxxabiv117__class_type_infoD0Ev'
of
/opt/compiler/mingw-w64/lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/lib/../lib/libstdc++.a(class_type_info.o):
defined in discarded section `.text' of /tmp/ccy6gCyh.o (symbol from plugin)
collect2: error: ld returned 1 exit status
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Subject: [Bug lto/65536] LTO line number information garbled
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65536

--- Comment #38 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #27)
> I simply use --save-temps --verbose and use lto1 invocation from there. It
> is easy ;)

When I add those two options to an invokation of xg++, I get back the call to
collect2 but no call to lto1, although I can see that lto1 is running.
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Subject: [Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65544

--- Comment #4 from Thomas Pöchtrager <t.poechtrager at gmail dot com> ---
If it matters, there are no linker errors with -fno-use-linker-plugin.
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Subject: [Bug c++/65547] Gcc not giving preprocessor error for invalid invocation of variadic macro
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide547

--- Comment #7 from Edward Diener <eldlistmailingz at tropicsoft dot com> ---
(In reply to Jonathan Wakely from comment #5)
> And as has been documented forever, the way to get diagnostics for GNU
> extensions that contradict the ISO standard is the -pedantic switch:
>
> https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Warning-Options.html#index-
> pedantic-279
>
> There is no bug here.

So the GNU extension in this case is that the programmer does not have to pass
an argument when a variadic parameter is used in a macro ? That would not even
bother me if there were a compiler flag which allowed it. But you appear to be
telling me that this non-C++ is by default. OK, how do I tell gcc to actually
follow the C++ standard ? Do I pass '-pedantic' for that ?

I realize gcc is used by many programmers and is loath to change the way it has
done things so as not to upset long-time users of the compiler. Nonetheless I
am going to suggest that the default should always be conformance to the C++
standard, and that GNU extensions should be turned on with some compiler
option.

[Bug lto/65544] LTO link fails with -static-libstdc++ + weak new/delete operators

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65544

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
No idea then what is special about the cross compiler setup.  But I must admit
I never tried using LTO with a cross-compiler...