flags are needed at compile time

Author: DiamonDinoia

CMakeLists.txt

@@ -4,6 +4,7 @@ project(finufft VERSION 2.2.0 LANGUAGES C CXX)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+include(CheckCXXCompilerFlag)
 
 set(GNU_LIKE_FRONTENDS AppleClang Clang GNU)
 if (CMAKE_CXX_COMPILER_ID IN_LIST GNU_LIKE_FRONTENDS)
@@ -12,7 +13,18 @@ if (CMAKE_CXX_COMPILER_ID IN_LIST GNU_LIKE_FRONTENDS)
             -funroll-loops
             -ffp-contract=fast
             -fexcess-precision=fast
+            -fno-math-errno
+            -fno-signed-zeros
+            -fno-trapping-math
+            -fassociative-math
+            -freciprocal-math
+            -fmerge-all-constants
     )
+    # if the compiler does  support -fimplicit-constexpr add it
+    check_cxx_compiler_flag("-fimplicit-constexpr" COMPILER_SUPPORTS_FIMPLICIT_CONSTEXPR)
+    if (COMPILER_SUPPORTS_FIMPLICIT_CONSTEXPR)
+        list(APPEND FINUFFT_CXX_FLAGS_RELEASE -fimplicit-constexpr)
+    endif ()
     set(FINUFFT_CXX_FLAGS_RELWITHDEBINFO -g ${FINUFFT_CXX_FLAGS_RELEASE})
 endif ()
 

src/spreadinterp.cpp

@@ -1014,11 +1014,6 @@ FINUFFT_NEVER_INLINE static void interp_square_wrap(
   target[1] = out[1];
 }
 
-#pragma GCC optimize("no-math-errno")
-#pragma GCC optimize("no-signed-zeros")
-#pragma GCC optimize("no-trapping-math")
-#pragma GCC optimize("associative-math")
-#pragma GCC optimize("reciprocal-math")
 template<uint8_t ns, class simd_type>
 void interp_square(FLT *FINUFFT_RESTRICT target, const FLT *du, const FLT *ker1,
                    const FLT *ker2, const BIGINT i1, const BIGINT i2, const UBIGINT N1,
@@ -1218,11 +1213,6 @@ FINUFFT_NEVER_INLINE static void interp_cube_wrapped(
   target[1] = out[1];
 }
 
-#pragma GCC optimize("no-math-errno")
-#pragma GCC optimize("no-signed-zeros")
-#pragma GCC optimize("no-trapping-math")
-#pragma GCC optimize("associative-math")
-#pragma GCC optimize("reciprocal-math")
 template<uint8_t ns, class simd_type>
 void interp_cube(FLT *FINUFFT_RESTRICT target, const FLT *du, const FLT *ker1,
                  const FLT *ker2, const FLT *ker3, const BIGINT i1, const BIGINT i2,