Try to improve the platform detection and offload it to a shell script

Makefile

@@ -28,13 +28,7 @@
 
 LIBSOURCES =  fft_fftw.c libcsdr_wrapper.c 
 #SOURCES = csdr.c $(LIBSOURCES)
-cpufeature = $(if $(findstring $(1),$(shell cat /proc/cpuinfo)),$(2))
-PARAMS_SSE = $(call cpufeature,sse,-msse) $(call cpufeature,sse2,-msse2) $(call cpufeature,sse3,-msse3) $(call cpufeature,sse4a,-msse4a) $(call cpufeature,sse4_1,-msse4.1) $(call cpufeature,sse4_2,-msse4.2 -msse4) -mfpmath=sse 
-PARAMS_NEON = -mfloat-abi=hard -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mvectorize-with-neon-quad -funsafe-math-optimizations -Wformat=0 -DNEON_OPTS
-#tnx Jan Szumiec for the Raspberry Pi support
-PARAMS_RASPI = -mfloat-abi=hard -mcpu=arm1176jzf-s -mfpu=vfp -funsafe-math-optimizations -Wformat=0
-PARAMS_ARM = $(if $(call cpufeature,BCM2708,dummy-text),$(PARAMS_RASPI),$(PARAMS_NEON))
-PARAMS_SIMD = $(if $(call cpufeature,sse,dummy-text),$(PARAMS_SSE),$(PARAMS_ARM))
+PARAMS_SIMD = $(shell ./detect_params.sh)
 PARAMS_LOOPVECT = -O3 -ffast-math -fdump-tree-vect-details -dumpbase dumpvect
 PARAMS_LIBS = -g -lm -lrt -lfftw3f -DUSE_FFTW -DLIBCSDR_GPL -DUSE_IMA_ADPCM
 PARAMS_SO = -fpic  

detect_params.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+# This software is part of libcsdr, a set of simple DSP routines for 
+# Software Defined Radio.
+#
+# Copyright (c) 2014, Andras Retzler <randras@sdr.hu>
+# Copyright (c) 2019, MeFisto94
+# All rights reserved.
+# 
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#    * Neither the name of the copyright holder nor the
+#      names of its contributors may be used to endorse or promote products
+#      derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# This file will try to detect the correct GCC optimization parameters, especially when running on ARM Platforms such as the Raspberry Pi
+
+# Desktop Processors
+if grep -q sse /proc/cpuinfo; then
+    if grep -q sse /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE-msse"
+    fi
+    if grep -q sse2 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse2"
+    fi
+    if grep -q sse3 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse3"
+    fi
+    if grep -q sse4a /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse4a"
+    fi
+    if grep -q sse4_1 /proc/cpuinfo; then 
+        PARAMS_SSE="$PARAMS_SSE -msse4.1"
+    fi
+    # TODO: Is this "-msse4" only for sse4_2 intended?
+    if grep -q sse4_2 /proc/cpuinfo; then
+        PARAMS_SSE="$PARAMS_SSE -msse4.2 -msse4"
+    fi
+    echo "$PARAMS_SSE -mfpmath=sse"
+    return 0
+else
+    ARCH = $(uname -m)
+    # Detect Raspberry Pi
+    if grep -q /proc/device-tree/model Raspberry; then
+        if $ARCH eq "aarch64"; then # Probably RPi 3+ on 64bit
+            # Float ABI is always hard on AARCH64. TODO: Does RPi 1 or 2 also have aarch64?
+            PARAMS_PI = "-mcpu=cortex-a53 -mtune=cortex-a53"
+        else # note -mcpu replaces -march
+        # See https://gist.github.com/fm4dd/c663217935dc17f0fc73c9c81b0aa845
+            if grep -q /proc/device-tree/model 3; then
+                PARAMS_PI = "-mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -mneon-for-64bits"
+            elif grep -q /proc/device-tree/model 2; then
+                PARAMS_PI = "-mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4"
+            elif grep -q /proc/device-tree/model 1; then
+                PARAMS_PI = "-mcpu=arm1176jzf-s -mfloat-abi=hard -mfpu=vfp"
+            fi
+        fi
+        PARAMS_ARM = "$PARAMS_PI -funsafe-math-optimizations -Wformat=0"
+    else # Generic ARM Device
+        # Most likely mtune is incorrect here
+        PARAMS_ARM = "-mfloat-abi=hard -march=`uname -m` -mtune=cortex-a8 -mfpu=neon -mvectorize-with-neon-quad -funsafe-math-optimizations -Wformat=0 -DNEON_OPTS"
+    fi
+    echo $PARAMS_ARM
+    return 0
+fi