Silence warning about "using serial compilation" (#823)

Author: mhucka

Makefile

@@ -36,7 +36,7 @@ CXX ?= g++
 NVCC ?= nvcc
 HIPCC ?= hipcc
 
-CXXFLAGS ?= -O3 -std=c++17 -fopenmp
+CXXFLAGS ?= -O3 -std=c++17 -fopenmp -flto=auto
 NVCCFLAGS ?= -O3 --std c++17 -Wno-deprecated-gpu-targets
 HIPCCFLAGS ?= -O3
 

pybind_interface/avx2/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim)
 IF (WIN32)
     set(CMAKE_CXX_FLAGS "/arch:AVX2 /O2 /openmp")
 ELSE()
-    set(CMAKE_CXX_FLAGS "-mavx2 -mfma -O3")
+    set(CMAKE_CXX_FLAGS "-mavx2 -mfma -O3 -flto=auto")
 ENDIF()
 
 if(APPLE)

pybind_interface/avx512/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim)
 IF (WIN32)
     set(CMAKE_CXX_FLAGS "/arch:AVX512 /O2 /openmp")
 ELSE()
-    set(CMAKE_CXX_FLAGS "-mavx512f -mbmi2 -O3")
+    set(CMAKE_CXX_FLAGS "-mavx512f -mbmi2 -O3 -flto=auto")
 ENDIF()
 
 if(APPLE)

pybind_interface/basic/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim)
 if(WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 else()
-    set(CMAKE_CXX_FLAGS "-O3")
+    set(CMAKE_CXX_FLAGS "-O3 -flto=auto")
 endif()
 
 if(APPLE)

pybind_interface/cuda/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim LANGUAGES CXX CUDA)
 if(WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 else()
-    set(CMAKE_CXX_FLAGS "-O3")
+    set(CMAKE_CXX_FLAGS "-O3 -flto=auto")
 endif()
 
 if(APPLE)

pybind_interface/custatevec/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim LANGUAGES CXX CUDA)
 if(WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 else()
-    set(CMAKE_CXX_FLAGS "-O3")
+    set(CMAKE_CXX_FLAGS "-O3 -flto=auto")
 endif()
 
 if(APPLE)

pybind_interface/decide/CMakeLists.txt

@@ -21,7 +21,7 @@ check_language(CUDA)
 if(WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 else()
-    set(CMAKE_CXX_FLAGS "-O3")
+    set(CMAKE_CXX_FLAGS "-O3 -flto=auto")
 endif()
 
 if(APPLE)

pybind_interface/hip/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim LANGUAGES CXX HIP)
 if(WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 else()
-    set(CMAKE_CXX_FLAGS "-O3")
+    set(CMAKE_CXX_FLAGS "-O3 -flto=auto")
 endif()
 
 INCLUDE(../GetPybind11.cmake)

pybind_interface/sse/CMakeLists.txt

@@ -18,7 +18,7 @@ project(qsim)
 IF (WIN32)
     set(CMAKE_CXX_FLAGS "/O2 /openmp")
 ELSE()
-    set(CMAKE_CXX_FLAGS "-msse4.1 -O3")
+    set(CMAKE_CXX_FLAGS "-msse4.1 -O3 -flto=auto")
 ENDIF()
 
 if(APPLE)