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Fix GCC 13 Release build test failures (#7364) #8176

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Fix GCC 13 Release build test failures (#7364) #8176

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c844d0b
Fix GCC 13 Release build test failures (#7364)
damyanp Feb 19, 2026
4a8caff
Use default GCC from build image instead of gcc-9
damyanp Feb 19, 2026
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15 changes: 5 additions & 10 deletions azure-pipelines.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ stages:

variables:
macOS: macOS-latest
linux: Ubuntu-22.04 # FIXME: #7364, DXC does not build correctly with GCC 13+
linux: Ubuntu-24.04

strategy:
matrix:
Expand All @@ -99,13 +99,13 @@ stages:
Linux_Gcc_Release:
image: ${{ variables.linux }}
configuration: Release
CC: gcc-9
CXX: g++-9
CC: gcc
CXX: g++
Linux_Gcc_Debug:
image: ${{ variables.linux }}
configuration: Debug
CC: gcc-9
CXX: g++-9
CC: gcc
CXX: g++
CMAKE_OPTS: -DLLVM_USE_SPLIT_DWARF=On
MacOS_Clang_Release:
image: ${{ variables.macOS }}
Expand Down Expand Up @@ -144,11 +144,6 @@ stages:
displayName: 'Installing dependencies'
condition: eq(variables['image'], variables['linux'])

- bash: |
sudo apt-get install g++-9 -y
displayName: 'Installing g++-9'
condition: and(eq(variables['CXX'], 'g++-9'), eq(variables['image'], variables['linux']))

- bash: |
brew update
brew install ninja
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8 changes: 8 additions & 0 deletions cmake/modules/HandleLLVMOptions.cmake
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Expand Up @@ -16,6 +16,14 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
message(FATAL_ERROR "Host GCC version must be at least 4.7!")
endif()
# GCC 13 has a known miscompilation bug in -funswitch-loops
# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109934) that causes
# widespread test failures at -O3. Disable -funswitch-loops for GCC 13.
if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.0 AND
CMAKE_CXX_COMPILER_VERSION VERSION_LESS 14.0)
add_compile_options(-fno-unswitch-loops)
message(STATUS "Disabling -funswitch-loops due to GCC 13 miscompilation bug (PR109934)")
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
message(FATAL_ERROR "Host Clang version must be at least 3.1!")
Expand Down