Bug 1610457

User is unable to use link time optimization with –std=c++17 and statically link boost with devtoolset-7-gcc.

User pointed to the commit https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=258287 and the bug report https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004

Using the libboost_program_options.a from the gcc bug report, below is result from tests:

$ scl enable devtoolset-7 bash
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c3
[reduced]$ g++ -w -Wl,--no-demangle -flto lines.ii options.ii -O1 -std=c++1z -o options ../unreduced/libboost_program_options.a
../unreduced/libboost_program_options.a(value_semantic.o): In function `_ZN5boost15program_options10validators17get_single_stringIcEERKNSt7__cxx1112basic_stringIT_St11char_traitsIS5_ESaIS5_EEERKSt6vectorIS9_SaIS9_EEb':
value_semantic.cpp:(.text._ZN5boost15program_options10validators17get_single_stringIcEERKNSt7__cxx1112basic_stringIT_St11char_traitsIS5_ESaIS5_EEERKSt6vectorIS9_SaIS9_EEb[_ZN5boost15program_options10validators17get_single_stringIcEERKNSt7__cxx1112basic_stringIT_St11char_traitsIS5_ESaIS5_EEERKSt6vectorIS9_SaIS9_EEb]+0x90): undefined reference to `_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev'
../unreduced/libboost_program_options.a(value_semantic.o): In function `_GLOBAL__sub_I__ZNK5boost15program_options29value_semantic_codecvt_helperIcE5parseERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaISB_EEb':
value_semantic.cpp:(.text.startup+0x1e): undefined reference to `_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev'
collect2: error: ld returned 1 exit status

# for the sake of testing, no errors if using Red Hat provided dynamic library
[reduced]$ g++ -w -Wl,--no-demangle -flto lines.ii options.ii -O1 -std=c++1z -o options -lboost_program_options

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c4
[unreduced]$ g++ -w -flto -Wl,--no-demangle l.ii o.ii -O1 -std=c++1z ./libboost_program_options.a
./libboost_program_options.a(value_semantic.o): In function `_GLOBAL__sub_I__ZNK5boost15program_options29value_semantic_codecvt_helperIcE5parseERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaISB_EEb':
value_semantic.cpp:(.text.startup+0x1e): undefined reference to `_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev'
collect2: error: ld returned 1 exit status

# for the sake of testing, with the Red Hat provided dynamic library
unreduced]$ g++ -w -flto -Wl,--no-demangle l.ii o.ii -O1 -std=c++1z -lboost_program_options
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `_ZN5boost15program_options16validation_errorC2ENS1_6kind_tERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESA_i':
<artificial>:(.text+0x214f): undefined reference to `_ZN5boost15program_options16validation_error12get_templateB5cxx11ENS1_6kind_tE'
<artificial>:(.text+0x2163): undefined reference to `_ZN5boost15program_options22error_with_option_nameC2ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES9_S9_i'
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `_ZNK5boost15program_options11typed_valueIN5utils5LinesEcE4nameB5cxx11Ev':
<artificial>:(.text+0x2fb6): undefined reference to `_ZN5boost15program_options3argB5cxx11E'
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `_ZNK5boost15program_options11typed_valueIicE4nameB5cxx11Ev':
<artificial>:(.text+0x358c): undefined reference to `_ZN5boost15program_options3argB5cxx11E'
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `_ZNK5boost15program_options11typed_valueIN5utils5LinesEcE6xparseERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaISD_EE':
<artificial>:(.text+0x571d): undefined reference to `_ZN5boost15program_options8validateERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS9_EEPS9_i'
<artificial>:(.text+0x5d63): undefined reference to `_ZN5boost15program_options20invalid_option_valueC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `_ZN5boost15program_options8validateIicEEvRNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIT0_St11char_traitsIS7_ESaIS7_EEESaISB_EEPT_l':
<artificial>:(.text+0x6c21): undefined reference to `_ZN5boost15program_options20invalid_option_valueC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o: In function `main':
<artificial>:(.text+0x6df6): undefined reference to `_ZN5boost15program_options19options_descriptionC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEjj'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0xaa0): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0xaf8): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0xb70): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0xc30): undefined reference to `_ZNK5boost15program_options29value_semantic_codecvt_helperIcE5parseERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaISB_EEb'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0xcd0): undefined reference to `_ZNK5boost15program_options29value_semantic_codecvt_helperIcE5parseERNS_3anyERKSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaISB_EEb'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0x11b8): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0x1210): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/tmp/ccVfdhyi.ltrans0.ltrans.o:(.rodata+0x1288): undefined reference to `_ZNK5boost15program_options22error_with_option_name23substitute_placeholdersERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
collect2: error: ld returned 1 exit status

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c5
[reduced]$ g++ -O2 -c value_semantic.ii
[reduced]$ g++ -w -Wl,--no-demangle lines.ii options.ii -O2 -std=c++1z -flto value_semantic.o 2>&1 | grep _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev
value_semantic.ii:(.text.startup+0x20): undefined reference to `_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev'


--------------------------------------------------------------------------------
Now, with a devtoolset-7-gcc built with the pointed patch:

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c3
[reduced]$ g++ -w -Wl,--no-demangle -flto lines.ii options.ii -O1 -std=c++1z -o options ../unreduced/libboost_program_options.a
# for the sake of testing, also works with dynamic libboost
[reduced]$ g++ -w -Wl,--no-demangle -flto lines.ii options.ii -O1 -std=c++1z -o options -lboost_program_options

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c4
[unreduced]$ g++ -w -flto -Wl,--no-demangle l.ii o.ii -O1 -std=c++1z ./libboost_program_options.a
lto1: internal compiler error: in register_resolution, at lto/lto.c:841
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
# for the sake of testing, using Red Hat provided dynamic library
[unreduced]$ g++ -w -flto -Wl,--no-demangle l.ii o.ii -O1 -std=c++1z -lboost_program_options
lto1: internal compiler error: in register_resolution, at lto/lto.c:841
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c5
[reduced]$ g++ -O2 -c value_semantic.ii
[reduced]$ g++ -w -Wl,--no-demangle lines.ii options.ii -O2 -std=c++1z -flto value_semantic.o 2>&1 | grep _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev

--------------------------------------------------------------------------------

Need further investigation, as the test in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81004#c4
triggers an ICE, so, would need more patches.