Set /bigobj option on MSVC to fix object limit error.
#2594
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Sample error message when building downstream on Windows with MSVC: ``` FAILED: llvm-external-projects/stablehlo/stablehlo/dialect/CMakeFiles/obj.VhloOps.dir/VhloOps.cpp.obj C:\ProgramData\Chocolatey\bin\ccache C:\PROGRA~1\MICROS~2\2022\ENTERP~1\VC\Tools\MSVC\1441~1.341\bin\Hostx64\x64\cl.exe /nologo /TP -DGTEST_HAS_RTTI=0 -D_HAS_EXCEPTIONS=0 -D_USE_MATH_DEFINES -ID:\a\iree\iree\third_party\llvm-project\llvm\include -ID:\a\iree\iree\build-windows\llvm-project\include -ID:\a\iree\iree\third_party\llvm-project\mlir\include -ID:\a\iree\iree\third_party\stablehlo -ID:\a\iree\iree\build-windows\llvm-external-projects\stablehlo -ID:\a\iree\iree\third_party\llvm-project\lld\include -ID:\a\iree\iree\build-windows\llvm-project\tools\lld\include -external:I\..\mlir\include -external:ID:\a\iree\iree\build-windows\llvm-project\tools\mlir\include -external:W0 /DWIN32 /D_WINDOWS /EHsc /Z7 /O2 /Ob1 -std:c++17 -MD /EHs-c- /GR- /showIncludes /Follvm-external-projects\stablehlo\stablehlo\dialect\CMakeFiles\obj.VhloOps.dir\VhloOps.cpp.obj /Fdllvm-external-projects\stablehlo\stablehlo\dialect\CMakeFiles\obj.VhloOps.dir\ /FS -c D:\a\iree\iree\third_party\stablehlo\stablehlo\dialect\VhloOps.cpp cl : Command line warning D9025 : overriding '/EHs' with '/EHs-' cl : Command line warning D9025 : overriding '/EHc' with '/EHc-' D:\a\iree\iree\third_party\stablehlo\stablehlo\dialect\VhloOps.cpp : fatal error C1128: number of sections exceeded object file format limit: compile with /bigobj ```
ScottTodd
commented
Oct 16, 2024
GleasonK
approved these changes
Oct 16, 2024
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This fixes downstream build errors tracked at iree-org/iree#18785.
Sample error message when building on Windows with MSVC:
I think our downstream Windows builds worked with #2573 but they do not work with #2575, without this change. Hooray for compiler options whack-a-mole.