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perf(cmake): Unix Release -fno-math-errno with -ffast-math #8

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Merged
cursor merged 1 commit into from
Apr 27, 2026
+4 −2
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perf(cmake): Unix Release -fno-math-errno with -ffast-math #8

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6 changes: 4 additions & 2 deletions cmake/ETLPlatform.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,9 @@ endif()

if(UNIX)
# optimization/debug flags
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffast-math")
# -ffast-math: relax IEEE / errno rules for faster libm and codegen.
# -fno-math-errno: avoid errno writes from inlined math (pairs with -ffast-math).
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffast-math -fno-math-errno")
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
# XXX : attach debug symbols to all builds for now
# set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s")
Expand All @@ -64,7 +66,7 @@ if(UNIX)
endif()
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall")

set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffast-math")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffast-math -fno-math-errno")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall")

if(ENABLE_ASAN)
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