Use xcrun to find SDK paths on OSX host during configure

Summary:
Previously it was required to provide SDKROOT during configure on Mojave
hosts to `make` the project which in scripts was messing up local clang
and somewhat error-prone. Instead we could use xcrun to find required SDK
paths automatically.

Reviewed By: jvillard

Differential Revision: D16072354

fbshipit-source-id: 93cbf3980

Makefile.autoconf.in

@@ -28,6 +28,7 @@ ENABLE_OCAMLOPT_CUSTOM_CC = @ENABLE_OCAMLOPT_CUSTOM_CC@
 ENABLE_OCAML_BINANNOT = @ENABLE_OCAML_BINANNOT@
 exec_prefix = @exec_prefix@
 GNU_SED = @GNU_SED@
+HAS_OBJC = @HAS_OBJC@
 INFER_MAJOR = @INFER_MAJOR@
 INFER_MAN_LAST_MODIFIED = @INFER_MAN_LAST_MODIFIED@
 INFER_MINOR = @INFER_MINOR@
@@ -74,11 +75,11 @@ SDKROOT = @SDKROOT@
 SHASUM = @SHASUM@
 USER_JAVA_HOME = @USER_JAVA_HOME@
 UTOP = @UTOP@
-XCODE_SELECT = @XCODE_SELECT@
+WINDOWS_BUILD = @WINDOWS_BUILD@
 XCODE_BASE = @XCODE_BASE@
-HAS_OBJC = @HAS_OBJC@
+XCODE_SELECT = @XCODE_SELECT@
 XCPRETTY = @XCPRETTY@
-WINDOWS_BUILD = @WINDOWS_BUILD@
+XCRUN = @XCRUN@
 
 ifneq (,$(findstring s,$(MAKEFLAGS)))
 # quiet mode

build-infer.sh

@@ -142,17 +142,6 @@ echo >&2
 echo "installing infer dependencies; this can take up to 30 minutes... " >&2
 opam_retry install_opam_deps
 
-#fix for Mojave
-if [ "$OSTYPE" == "darwin18" ]; then
-    if [ "$(command -v xcode-select)" == "" ]; then
-        xcode-select --install
-    fi
-    SDKROOT=${SDKROOT:-/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk}
-    if [ -d "$SDKROOT" ]; then
-        export SDKROOT
-    fi
-fi
-
 if [ "$ONLY_SETUP_OPAM" == "yes" ]; then
   exit 0
 fi

configure.ac

@@ -130,8 +130,18 @@ AS_IF(
         [XCODE_BASE=$XCODE_SELECT_OUT HAS_OBJC=yes],
   [HAS_OBJC=no])
 
+AC_CHECK_TOOL([XCRUN], [xcrun], [no])
+
+AC_ARG_VAR([SDKROOT], [path to the OSX platform SDK used by clang])
+AS_IF(
+  [test "x$SDKROOT" = "x" && test "x$XCRUN" != "xno"],
+        [SDKROOT=`xcrun --sdk macosx --show-sdk-path`]
+)
+
 AC_SUBST([XCODE_BASE])
 AC_SUBST([HAS_OBJC])
+AC_SUBST([SDKROOT])
+
 
 # prefer clang over gcc because the plugins makes use of
 # clang-specific #pragma's
@@ -350,8 +360,6 @@ AS_IF([test "$SED" != "xno"], [
 AC_SUBST([GNU_SED])
 
 AC_CHECK_TOOL([BREW], [brew], [no])
-AC_ARG_VAR([SDKROOT], [path to the OSX platform SDK used by clang])
-AC_SUBST([SDKROOT])
 
 AC_CHECK_TOOL([INSTALL_NAME_TOOL], [install_name_tool], [no])
 AC_SUBST([INSTALL_NAME_TOOL])