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configure: factorize gcc machine option checks

check_gcc_machine_option() replaces individual -m* checks

Change-Id: I0f4a82020c0541b99209321907e80e071d1245e1

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -378,6 +378,19 @@

     fi

 }

+# tests for -m$1 toggling the feature given in $2. If $2 is empty $1 is used.

+check_gcc_machine_option() {

+    local opt="$1"

+    local feature="$2"

+    [ -n "$feature" ] || feature="$opt"

+

+    if enabled gcc && ! disabled "$feature" && ! check_cflags "-m$opt"; then

+        RTCD_OPTIONS="${RTCD_OPTIONS}--disable-$feature "

+    else

+        soft_enable "$feature"

+    fi

+}

+

 write_common_config_banner() {

     print_webm_license config.mk "##" ""

     echo '# This file automatically generated by configure. Do not edit!' >> config.mk

@@ -1096,23 +1109,9 @@

         soft_enable ssse3

         # We can't use 'check_cflags' until the compiler is configured and CC is

         # populated.

-        if enabled gcc && ! disabled sse4_1 && ! check_cflags -msse4; then

-            RTCD_OPTIONS="${RTCD_OPTIONS}--disable-sse4_1 "

-        else

-            soft_enable sse4_1

-        fi

-

-        if enabled gcc && ! disabled avx && ! check_cflags -mavx; then

-            RTCD_OPTIONS="${RTCD_OPTIONS}--disable-avx "

-        else

-            soft_enable avx

-        fi

-

-        if enabled gcc && ! disabled avx2 && ! check_cflags -mavx2; then

-            RTCD_OPTIONS="${RTCD_OPTIONS}--disable-avx2 "

-        else

-            soft_enable avx2

-        fi

+        check_gcc_machine_option sse4 sse4_1

+        check_gcc_machine_option avx

+        check_gcc_machine_option avx2

         case "${AS}" in

             auto|"")