[Rd] R-4.2.3 build from source on Windows (w Rtools42) - lto1.exe error

[Prof Brian Ripley]

Initial comments

- R 4.2.3 is not current

- -flto does not seem to be the default in src/gnuwin32/MkRules.

- LTO versions in GCC are tied to the compiler version, and in recent 
GCC are the same as the compiler version.  The recommended toolchain for 
R 4.2.x is Rtools42 which according to NEWS is based on GCC 10 not 9.

- LTO mismatches in my experience are most often seen in incremental 
builds, so first do an ab initio build.  (Not so long ago they were not 
detected during linking but gave segfaults.)

Assuming it is important to use LTO, I would first build without LTO to 
isolate the issue.  And be aware of the following in the NEWS for R 4.3.0:

     • The Rcomplex definition (in header R_ext/Complex.h) has been
       extended to prevent possible mis-compilation when interfacing
       with Fortran (PR#18430).

AFAIR that "possible mis-compilation" is most likely using LTO.


On 11/05/2023 02:07, Gmail wrote:
> Windows 11 PRO Version  10.0.22621 Build 22621
> Processor: Intel(R) Core(TM) i7-1065G7 "Icelake-client"
> ```
> ​svn info	
> Path: .
> Working Copy Root Path: /d/R_DEV/R-4/R42/R-4-2-branch
> URL: https://svn.r-project.org/R/branches/R-4-2-branch
> Relative URL: ^/branches/R-4-2-branch
> Repository Root: https://svn.r-project.org/R
> Repository UUID: 00db46b3-68df-0310-9c12-caf00c1e9a41
> Revision: 84417
> Node Kind: directory
> Schedule: normal
> Last Changed Author: kalibera
> Last Changed Rev: 84249
> Last Changed Date: 2023-04-13 07:12:24 +0000 (Thu, 13 Apr 2023)
> ```
> 
> Only adaptation done in MkRules.local was adding: `EOPTS = -march=native`  - that's why I included the cpu-type info above;
> running make all recommended​ fails at/with:
> ```
> gcc -shared -s -static-libgcc -o utils.dll tmp.def init.o io.o size.o sock.o stubs.o utils.o hashtab.o windows/dataentry.o windows/dialogs.o windows/registry.o windows/util.o windows/widgets.o ../../../gnuwin32/dllversion.o -lRgraphapp -lversion -L/x86_64-w64-mingw32.static.posix/lib/x64 -llzma -LC:/rtools42/x86_64-w64-mingw32.static.posix/lib/x64 -LC:/rtools42/x86_64-w64-mingw32.static.posix/lib -L../../../../bin/x64 -lR
> 
> lto1.exe: fatal error: bytecode stream in file 'windows/dataentry.o' generated with LTO version 9.3 instead of the expected 9.4
> compilation terminated.
> 
> lto-wrapper.exe: fatal error: C:\rtools42\x86_64-w64-mingw32.static.posix\bin\gcc.exe returned 1 exit status
> compilation terminated.
> C:\rtools42\x86_64-w64-mingw32.static.posix\bin/ld.exe: error: lto-wrapper failed
> collect2.exe: error: ld returned 1 exit status
> cp: cannot stat 'utils.dll': No such file or directory
> make[4]: *** [Makefile.win:36: shlib] Error 1
> make[3]: *** [../../../share/make/basepkg.mk:145: mksrc-win2] Error 1
> make[2]: *** [Makefile.win:24: all] Error 2
> make[1]: *** [Makefile.win:34: R] Error 1
> make: *** [Makefile:18: all] Error 2
> ```
> Any hints/ideas on how to fix this? I guess I could
> gcc -c -flto ... windows/dataentry.c -o windows/dataentry.o
> with the exact path of that fiile ...
> and it hopefully will fix that but I guess it would make sense to add a Revision to update that LTO version mismatch there, and I don't know yet if this is the only one?
> 
> Greetings,
> W
> 
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-- 
Brian D. Ripley,                  ripley using stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford