[Bug driver/90392] [9/10 Regression] Assertion failure in ldlang.c:6868 when compiling with -flto

[Bug driver/90392] [9/10 Regression] Assertion failure in ldlang.c:6868 when compiling with -flto

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.3                         |9.4

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 9.3.0 has been released, adjusting target milestone.

[Bug driver/90392] [9/10 Regression] Assertion failure in ldlang.c:6868 when compiling with -flto

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-04-01

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Unsure what the remaining driver issue is - an actual testcase with a
smaller command-line should be able to show this more clearly?

[Bug driver/90392] [9/10 Regression] Assertion failure in ldlang.c:6868 when compiling with -flto

[ohaiziejohwahkeezuoz at xff dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

--- Comment #11 from ohaiziejohwahkeezuoz at xff dot cz ---
Try this:

touch a.a a.o
gcc -save-temps -Wl,-debug -o a a.o a.a -ldl

Outputs:

...

/usr/bin/ld -plugin /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/lto-wrapper
-plugin-opt=-fresolution=-ldl.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --build-id
--eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -pie -o a
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0
-L/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../.. a.o a.a
-ldl -lgcc --push-state --as-needed -lgcc_s --pop-state -lc -lgcc --push-state
--as-needed -lgcc_s --pop-state
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib/crtn.o
/usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib/Scrt1.o: in
function `_start':
(.text+0x24): undefined reference to `main'


Notice the: ... -plugin-opt=-fresolution=-ldl.res ...

[Bug driver/90392] [8/9/10 Regression] Assertion failure in ldlang.c:6868 when compiling with -flto

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[9/10 Regression] Assertion |[8/9/10 Regression]
                   |failure in ldlang.c:6868    |Assertion failure in
                   |when compiling with -flto   |ldlang.c:6868 when
                   |                            |compiling with -flto
                 CC|                            |law at redhat dot com

--- Comment #12 from Jeffrey A. Law <law at redhat dot com> ---
GCC 8 also affected.  Digging further back, but starting to wonder if the %u
issue is a regression or not.

[Bug driver/90392] Bogus value for %u in LINK_PLUGIN_SPEC

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
            Summary|[8/9/10 Regression]         |Bogus value for %u in
                   |Assertion failure in        |LINK_PLUGIN_SPEC
                   |ldlang.c:6868 when          |
                   |compiling with -flto        |

--- Comment #13 from Jeffrey A. Law <law at redhat dot com> ---
Updating summary, dropping regression marker.  Behavior seen as far back as
gcc-6, probably started before then.  Given the dl.res has been consistent,
it's most likely not memory corruption -- if it were memory corruption I'd
expect to see different results over time rather than the consistent "dl.res"
output for %u.res.

[Bug driver/90392] Bogus value for %u in LINK_PLUGIN_SPEC

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |9.5

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.

[Bug driver/90392] Bogus value for %u in LINK_PLUGIN_SPEC

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90392

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |---