configure: Add check_cc/require_cc helper functions to simplify some expressions

configure

@@ -1129,6 +1129,14 @@ check_compile_assert(){
     test_code cc "$headers" "char c[2 * !!($condition) - 1]" "$@" && enable "$name"
 }
 
+check_cc(){
+    log check_cc "$@"
+    name=$1
+    shift
+    disable "$name"
+    test_code cc "$@" && enable "$name"
+}
+
 require(){
     log require "$@"
     name_version="$1"
@@ -1137,6 +1145,13 @@ require(){
     check_lib $name "$@" || die "ERROR: $name_version not found"
 }
 
+require_cc(){
+    log require_cc "$@"
+    name="$1"
+    shift
+    test_code cc "$@" || die "ERROR: $name failed"
+}
+
 require_header(){
     log require_header "$@"
     headers="$1"
@@ -4172,18 +4187,12 @@ extern_prefix=${sym%%ff_extern*}
 ! disabled inline_asm && check_inline_asm inline_asm '"" ::'
 
 for restrict_keyword in restrict __restrict__ __restrict ""; do
-    test_cc <<EOF && break
-void foo(char * $restrict_keyword p);
-EOF
+    test_code cc "" "char * $restrict_keyword p" && break
 done
 
-test_cc <<EOF && enable pragma_deprecated
-void foo(void) { _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") }
-EOF
+check_cc pragma_deprecated "" '_Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")'
 
-test_cc <<EOF || die "endian test failed"
-unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
-EOF
+require_cc "endian test" "" "unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E'"
 od -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian
 
 check_gas() {
@@ -4334,19 +4343,17 @@ elif enabled ppc; then
         check_cflags -maltivec -mabi=altivec
 
         # check if our compiler supports Motorola AltiVec C API
-        test_code cc altivec.h "vector signed int v1 = (vector signed int) { 0 };
-                                vector signed int v2 = (vector signed int) { 1 };
-                                v1 = vec_add(v1, v2);" ||
-            disable altivec
+        check_cc altivec altivec.h "vector signed int v1 = (vector signed int) { 0 };
+                                    vector signed int v2 = (vector signed int) { 1 };
+                                    v1 = vec_add(v1, v2);"
 
         enabled altivec || warn "Altivec disabled, possibly missing --cpu flag"
     fi
 
     if enabled vsx; then
         check_cflags -mvsx &&
-        test_code cc altivec.h "int v[4] = { 0 };
-                                vector signed int v1 = vec_vsx_ld(0, v);" ||
-            disable vsx
+        check_cc vsx altivec.h "int v[4] = { 0 };
+                                vector signed int v1 = vec_vsx_ld(0, v);"
     fi
 
     if enabled power8; then
@@ -4427,7 +4434,7 @@ EOF
 
 fi
 
-test_code cc arm_neon.h "int16x8_t test = vdupq_n_s16(0)" && enable intrinsics_neon
+check_cc intrinsics_neon arm_neon.h "int16x8_t test = vdupq_n_s16(0)"
 
 check_ldflags -Wl,--as-needed
 
@@ -4761,15 +4768,11 @@ EOF
 
 enabled vaapi && require vaapi va/va.h vaInitialize -lva
 
-enabled vaapi &&
-    test_code cc "va/va.h" "vaCreateSurfaces(0, 0, 0, 0, 0, 0, 0, 0)" ||
-    disable vaapi
-
-enabled vaapi &&
-    check_lib vaapi_drm "va/va.h va/va_drm.h" vaGetDisplayDRM -lva -lva-drm
-
-enabled vaapi &&
-    check_lib vaapi_x11 "va/va.h va/va_x11.h" vaGetDisplay -lva -lva-x11 -lX11
+if enabled vaapi; then
+     require_cc vaapi "va/va.h" "vaCreateSurfaces(0, 0, 0, 0, 0, 0, 0, 0)"
+     check_lib vaapi_drm "va/va.h va/va_drm.h" vaGetDisplayDRM -lva -lva-drm
+     check_lib vaapi_x11 "va/va.h va/va_x11.h" vaGetDisplay -lva -lva-x11 -lX11
+fi
 
 enabled vaapi &&
     test_cpp_condition "va/va.h" "VA_CHECK_VERSION(1, 0, 0)" &&
@@ -4821,9 +4824,7 @@ check_disable_warning_headers -Wno-unused-variable
 
 check_objcflags -fobjc-arc && enable objc_arc
 
-test_cc <<EOF && enable blocks_extension
-void (^block)(void);
-EOF
+check_cc blocks_extension "" "void (^block)(void)"
 
 # add some linker flags
 check_ldflags -Wl,--warn-common
@@ -4877,14 +4878,10 @@ if enabled proper_dce; then
     if test_ldflags -Wl,${version_script},$TMPV; then
         append SHFLAGS '-Wl,${version_script},\$(SUBDIR)lib\$(NAME).ver'
         quotes='""'
-        test_cc <<EOF && enable symver_asm_label
-void ff_foo(void) __asm__ ("av_foo@VERSION");
-void ff_foo(void) { ${inline_asm+__asm__($quotes);} }
-EOF
-        test_cc <<EOF && enable symver_gnu_asm
-__asm__(".symver ff_foo,av_foo@VERSION");
-void ff_foo(void) {}
-EOF
+        check_cc symver_asm_label "" "void ff_foo(void) __asm__ ("av_foo@VERSION");
+                                      void ff_foo(void) { ${inline_asm+__asm__($quotes);} }"
+        check_cc symver_gnu_asm   "" "__asm__(".symver ff_foo,av_foo@VERSION");
+                                      void ff_foo(void) {}"
     fi
 fi