Revert "Stop git from merging generated files"

[RalfJung]

This reverts #133851. "-merge" makes git not even do merges if they are entirely conflict-free, which is not the behavior we want. We sometimes have conflict-free merges in generated files and it's much better if git can handle them automatically.

r? @oli-obk
Cc @jieyouxu @Urgau

[oli-obk]

@bors r+ rollup

[bors]

📌 Commit 4a60706 has been approved by oli-obk

It is now in the queue for this repository.

[jieyouxu]

@bors p=6 (contributor experience)

[jieyouxu]

Ah, that's unfortunate... Thanks for the revert.

[bors]

⌛ Testing commit 4a60706 with merge fcec77a...

[rust-log-analyzer]

The job i686-mingw failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

   Compiling rustc_driver v0.0.0 (C:\a\rust\rust\compiler\rustc_driver)
[RUSTC-TIMING] rustc_driver test:false 28.266
error: linking with `i686-w64-mingw32-gcc` failed: exit code: 1
  |
  = note: "i686-w64-mingw32-gcc" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-Wl,--large-address-aware" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1\\lib\\rustlib\\i686-pc-windows-gnu\\lib\\rsbegin.o" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\symbols.o" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\deps\\rustc_main-659084248a5844d9.rustc_main.bac7e71421769b6f-cgu.0.rcgu.o" "-Wl,-Bdynamic" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\deps\\rustc_driver-feab0383960d185a.dll" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1\\lib\\rustlib\\i686-pc-windows-gnu\\lib\\std-85e8e1afc0a1e2c0.dll" "-Wl,-Bstatic" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1\\lib\\rustlib\\i686-pc-windows-gnu\\lib\\libcompiler_builtins-d77c9d76f065957b.rlib" "-Wl,-Bdynamic" "-lpsapi" "-lshell32" "-lole32" "-luuid" "-ladvapi32" "-lws2_32" "-lntdll" "-lkernel32" "-ladvapi32" "-lole32" "-loleaut32" "-ladvapi32" "-lcfgmgr32" "-lgdi32" "-lkernel32" "-lmsimg32" "-lopengl32" "-luser32" "-lwinspool" "-lbcrypt" "-ladvapi32" "-lkernel32" "-lkernel32" "-ladvapi32" "-lntdll" "-luserenv" "-lws2_32" "-ldbghelp" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\advapi32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-errorhandling-l1-1-3.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-file-fromapp-l1-1-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-handle-l1-1-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-ioring-l1-1-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-3.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-4.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-5.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-6.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-7.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-memory-l1-1-8.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-synch-l1-2-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-sysinfo-l1-2-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-sysinfo-l1-2-3.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-sysinfo-l1-2-4.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-sysinfo-l1-2-6.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-util-l1-1-1.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-winrt-error-l1-1-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-winrt-l1-1-0.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-core-wow64-l1-1-1.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\api-ms-win-security-base-l1-2-2.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\avrt.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\bcp47mrm.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\bcryptprimitives.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\clfsw32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\dbghelp.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\elscore.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\gdi32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\icu.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\imagehlp.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\kernel32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\ktmw32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\netapi32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\normaliz.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\ntdll.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\ntdllk.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\ole32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\oleacc.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\oleaut32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\propsys.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\psapi.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\rtworkq.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\txfw32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\user32.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\usp10.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\version.dll_imports_indirect.lib" "C:\\a\\_temp\\msys64\\tmp\\rustcQdbIst\\wofutil.dll_imports_indirect.lib" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\build\\stacker-d3f5f2020a9db92d\\out" "-L" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\build\\psm-a8e1851838120981\\out" "-L" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\build\\blake3-0d7379973d66d445\\out" "-L" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\build\\rustc_llvm-9c1d12dc9076cada\\out" "-L" "C:/a/rust/rust/build/i686-pc-windows-gnu/llvm/lib" "-L" "C:/a/rust/rust/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.1.0" "-o" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1-rustc\\i686-pc-windows-gnu\\release\\deps\\rustc_main-659084248a5844d9.exe" "-Wl,--gc-sections" "-no-pie" "-Wl,-O1" "-nodefaultlibs" "C:\\a\\rust\\rust\\build\\i686-pc-windows-gnu\\stage1\\lib\\rustlib\\i686-pc-windows-gnu\\lib\\rsend.o"
  = note: C:/a/rust/rust/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.1.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot open output file C:\a\rust\rust\build\i686-pc-windows-gnu\stage1-rustc\i686-pc-windows-gnu\release\deps\rustc_main-659084248a5844d9.exe: Invalid argument␍
          collect2.exe: error: ld returned 1 exit status

[RUSTC-TIMING] rustc_main test:false 4.017
error: could not compile `rustc-main` (bin "rustc-main") due to 1 previous error
Build completed unsuccessfully in 0:33:09

[bors]

💔 Test failed - checks-actions

[RalfJung]

@bors retry Spurious MSVC thing again.

[jyn514]

i think we could achieve the goal of oli’s original PR by using a custom merge driver: https://git-scm.com/docs/gitattributes#Documentation/gitattributes.txt-String-1

(in this case it would probably be a simple script that uses git merge -X theirs or something like that)

[bors]

⌛ Testing commit 4a60706 with merge 8e37e15...

[bors]

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 8e37e15 to master...

[rust-timer]

Finished benchmarking commit (8e37e15): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (secondary 4.2%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	4.2%	[4.2%, 4.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 771.193s -> 771.396s (0.03%)
Artifact size: 331.00 MiB -> 330.93 MiB (-0.02%)

[jieyouxu]

Spurious MSVC thing again.

(@RalfJung btw, we're now tracking msvc and mingw failures separately in case they have different root causes, there's a separate CI-spurious-fail-mingw label now)