devel/cmake: change some default CFLAGS from -O3 to -O2
Alexey Dokuchaev
danfe at nsu.ru
Wed Feb 20 11:11:36 GMT 2019
Hi there,
I was building some software on Fedora Linux with CMake and noticed
that it was using -O2 optimization level while on FreeBSD, the same
build was performed with -O3 for some reason.
I've downloaded source .rpm for their CMake and found that they had
to patch several Modules/{Compiler,Platform}/*.cmake files so they
use -O2 for RELEASE mode. I'm attaching the patch for convenience.
I'm proposing we do the same in FreeBSD, esp. given that we default
to -O2 elsewhere.
./danfe
-------------- next part --------------
commit b247220ae5a91d8057fd57b5f6e50c93b168dc17
Author: Bjц╤rn Esser <besser82 at fedoraproject.org>
Date: Mon Jul 24 01:52:06 2017 +0200
Set optimization for RELEASE to Fedora default
Index: cmake-3.10.0/Modules/Compiler/Absoft-Fortran.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/Absoft-Fortran.cmake
+++ cmake-3.10.0/Modules/Compiler/Absoft-Fortran.cmake
@@ -1,7 +1,7 @@
string(APPEND CMAKE_Fortran_FLAGS_INIT " ")
string(APPEND CMAKE_Fortran_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_Fortran_FLAGS_MINSIZEREL_INIT " ")
-string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O3")
+string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O2")
string(APPEND CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT " -O2 -g")
set(CMAKE_Fortran_MODDIR_FLAG "-YMOD_OUT_DIR=")
set(CMAKE_Fortran_MODPATH_FLAG "-p")
Index: cmake-3.10.0/Modules/Compiler/G95-Fortran.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/G95-Fortran.cmake
+++ cmake-3.10.0/Modules/Compiler/G95-Fortran.cmake
@@ -1,7 +1,7 @@
string(APPEND CMAKE_Fortran_FLAGS_INIT " ")
string(APPEND CMAKE_Fortran_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_Fortran_FLAGS_MINSIZEREL_INIT " -Os")
-string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O3")
+string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O2")
string(APPEND CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT " -O2 -g")
set(CMAKE_Fortran_MODDIR_FLAG "-fmod=")
set(CMAKE_Fortran_VERBOSE_FLAG "-v")
Index: cmake-3.10.0/Modules/Compiler/GNU-Fortran.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/GNU-Fortran.cmake
+++ cmake-3.10.0/Modules/Compiler/GNU-Fortran.cmake
@@ -11,7 +11,7 @@ set(CMAKE_Fortran_POSTPROCESS_FLAG "-fpr
# No -DNDEBUG for Fortran.
string(APPEND CMAKE_Fortran_FLAGS_MINSIZEREL_INIT " -Os")
-string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O3")
+string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O2")
# No -isystem for Fortran because it will not find .mod files.
unset(CMAKE_INCLUDE_SYSTEM_FLAG_Fortran)
Index: cmake-3.10.0/Modules/Compiler/GNU.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/GNU.cmake
+++ cmake-3.10.0/Modules/Compiler/GNU.cmake
@@ -40,7 +40,7 @@ macro(__compiler_gnu lang)
string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG")
- string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG")
+ string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O2 -DNDEBUG")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
Index: cmake-3.10.0/Modules/Compiler/Intel.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/Intel.cmake
+++ cmake-3.10.0/Modules/Compiler/Intel.cmake
@@ -22,7 +22,7 @@ else()
string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os")
- string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3")
+ string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O2")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g")
set(CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "${CMAKE_${lang}_COMPILER}" "-QdM" "-P" "-Za" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
Index: cmake-3.10.0/Modules/Compiler/NVIDIA-CUDA.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/NVIDIA-CUDA.cmake
+++ cmake-3.10.0/Modules/Compiler/NVIDIA-CUDA.cmake
@@ -9,7 +9,7 @@ if(NOT "x${CMAKE_CUDA_SIMULATE_ID}" STRE
set(CMAKE_SHARED_LIBRARY_CUDA_FLAGS -fPIC)
string(APPEND CMAKE_CUDA_FLAGS_INIT " ")
string(APPEND CMAKE_CUDA_FLAGS_DEBUG_INIT " -g")
- string(APPEND CMAKE_CUDA_FLAGS_RELEASE_INIT " -O3 -DNDEBUG")
+ string(APPEND CMAKE_CUDA_FLAGS_RELEASE_INIT " -O2 -DNDEBUG")
string(APPEND CMAKE_CUDA_FLAGS_MINSIZEREL_INIT " -O1 -DNDEBUG")
string(APPEND CMAKE_CUDA_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
endif()
Index: cmake-3.10.0/Modules/Compiler/PathScale.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/PathScale.cmake
+++ cmake-3.10.0/Modules/Compiler/PathScale.cmake
@@ -16,6 +16,6 @@ macro(__compiler_pathscale lang)
string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g -O0")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os")
- string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3")
+ string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O2")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -g -O2")
endmacro()
Index: cmake-3.10.0/Modules/Platform/IRIX.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Platform/IRIX.cmake
+++ cmake-3.10.0/Modules/Platform/IRIX.cmake
@@ -7,7 +7,7 @@ if(NOT CMAKE_COMPILER_IS_GNUCXX)
"<CMAKE_CXX_COMPILER> -ar -o <TARGET> <OBJECTS>")
set (CMAKE_CXX_FLAGS_INIT "")
set (CMAKE_CXX_FLAGS_DEBUG_INIT "-g")
- set (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-O3 -DNDEBUG")
+ set (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-O2 -DNDEBUG")
set (CMAKE_CXX_FLAGS_RELEASE_INIT "-O2 -DNDEBUG")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2")
set (CMAKE_C_FLAGS_INIT "")
Index: cmake-3.10.0/Modules/Platform/IRIX64.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Platform/IRIX64.cmake
+++ cmake-3.10.0/Modules/Platform/IRIX64.cmake
@@ -37,7 +37,7 @@ if(NOT CMAKE_COMPILER_IS_GNUCC)
set(CMAKE_CXX_CREATE_STATIC_LIBRARY
"<CMAKE_CXX_COMPILER> -ar -o <TARGET> <OBJECTS>")
set (CMAKE_CXX_FLAGS_DEBUG_INIT "-g")
- set (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-O3 -DNDEBUG")
+ set (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-O2 -DNDEBUG")
set (CMAKE_CXX_FLAGS_RELEASE_INIT "-O2 -DNDEBUG")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2")
endif()
Index: cmake-3.10.0/Modules/Compiler/PGI.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/PGI.cmake
+++ cmake-3.10.0/Modules/Compiler/PGI.cmake
@@ -18,7 +18,7 @@ macro(__compiler_pgi lang)
string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g -O0")
string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -O2 -s")
- string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -fast -O3")
+ string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -fast -O2")
string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -gopt")
if(CMAKE_HOST_WIN32)
Index: cmake-3.10.0/Modules/Compiler/SunPro-ASM.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/SunPro-ASM.cmake
+++ cmake-3.10.0/Modules/Compiler/SunPro-ASM.cmake
@@ -11,7 +11,7 @@ set(CMAKE_SHARED_LIBRARY_SONAME_ASM_FLAG
string(APPEND CMAKE_ASM_FLAGS_INIT " ")
string(APPEND CMAKE_ASM_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_ASM_FLAGS_MINSIZEREL_INIT " -xO2 -xspace -DNDEBUG")
-string(APPEND CMAKE_ASM_FLAGS_RELEASE_INIT " -xO3 -DNDEBUG")
+string(APPEND CMAKE_ASM_FLAGS_RELEASE_INIT " -xO2 -DNDEBUG")
string(APPEND CMAKE_ASM_FLAGS_RELWITHDEBINFO_INIT " -g -xO2 -DNDEBUG")
# Initialize ASM link type selection flags. These flags are used when
Index: cmake-3.10.0/Modules/Compiler/SunPro-C.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/SunPro-C.cmake
+++ cmake-3.10.0/Modules/Compiler/SunPro-C.cmake
@@ -15,7 +15,7 @@ set(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "
string(APPEND CMAKE_C_FLAGS_INIT " ")
string(APPEND CMAKE_C_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT " -xO2 -xspace -DNDEBUG")
-string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " -xO3 -DNDEBUG")
+string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " -xO2 -DNDEBUG")
string(APPEND CMAKE_C_FLAGS_RELWITHDEBINFO_INIT " -g -xO2 -DNDEBUG")
# Initialize C link type selection flags. These flags are used when
Index: cmake-3.10.0/Modules/Compiler/SunPro-CXX.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/SunPro-CXX.cmake
+++ cmake-3.10.0/Modules/Compiler/SunPro-CXX.cmake
@@ -15,7 +15,7 @@ set(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG
string(APPEND CMAKE_CXX_FLAGS_INIT " ")
string(APPEND CMAKE_CXX_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -xO2 -xspace -DNDEBUG")
-string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -xO3 -DNDEBUG")
+string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -xO2 -DNDEBUG")
string(APPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT " -g -xO2 -DNDEBUG")
# Initialize C link type selection flags. These flags are used when
Index: cmake-3.10.0/Modules/Compiler/SunPro-Fortran.cmake
===================================================================
--- cmake-3.10.0.orig/Modules/Compiler/SunPro-Fortran.cmake
+++ cmake-3.10.0/Modules/Compiler/SunPro-Fortran.cmake
@@ -13,7 +13,7 @@ set(CMAKE_EXECUTABLE_RUNTIME_Fortran_FLA
string(APPEND CMAKE_Fortran_FLAGS_INIT " ")
string(APPEND CMAKE_Fortran_FLAGS_DEBUG_INIT " -g")
string(APPEND CMAKE_Fortran_FLAGS_MINSIZEREL_INIT " -xO2 -xspace -DNDEBUG")
-string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -xO3 -DNDEBUG")
+string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -xO2 -DNDEBUG")
string(APPEND CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT " -g -xO2 -DNDEBUG")
set(CMAKE_Fortran_MODDIR_FLAG "-moddir=")
set(CMAKE_Fortran_MODPATH_FLAG "-M")
More information about the kde-freebsd
mailing list