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Fix 32-bit GCC 13 and later excess precision #4840

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Merged
rouault merged 1 commit into from
Sep 5, 2026
+8 −2
Merged

Fix 32-bit GCC 13 and later excess precision #4840

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8 changes: 7 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,13 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM")
# breaks std::isinf(), std::isnan(), etc.
string(APPEND CMAKE_C_FLAGS " -fno-fast-math")
string(APPEND CMAKE_CXX_FLAGS " -fno-fast-math")
endif ()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND
CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13 AND
CMAKE_SIZEOF_VOID_P EQUAL 4)
# GCC 13 and later changed their C++ excess precision support, which impacts
# 32-bit builds. This restores the previous behavior.
string(APPEND CMAKE_CXX_FLAGS " -fexcess-precision=fast")
endif()

# Add other supported compiler flags
if(("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
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2 changes: 1 addition & 1 deletion ci/linux_gcc_32bit/start.sh
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Expand Up @@ -6,7 +6,7 @@ export TRAVIS_OS_NAME=linux
export BUILD_NAME=linux_gcc_32bit
export TRAVIS_BUILD_DIR="$WORK_DIR"

GCC_VERSION=12
GCC_VERSION=13

ARCH=i386

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