--- /dev/null
+#!/bin/bash
+
+print_usage () {
+ echo 'Usage: diag-build.sh [-v] xcodebuild [flags]'
+ echo ' diag-build.sh [-v] make [flags]'
+ echo ' diag-build.sh [-v] <other build command>'
+ echo
+ echo 'diagtool must be in your PATH'
+ echo 'If using an alternate build command, you must ensure that'
+ echo 'the compiler used matches the CC environment variable.'
+}
+
+# Mac OS X's BSD sed uses -E for extended regular expressions,
+# but GNU sed uses -r. Find out which one this system accepts.
+EXTENDED_SED_FLAG='-E'
+echo -n | sed $EXTENDED_SED_FLAG 's/a/b/' 2>/dev/null || EXTENDED_SED_FLAG='-r'
+
+if [[ "$1" == "-v" ]]; then
+ verbose=$1
+ shift
+fi
+
+guessing_cc=0
+
+if [[ -z "$CC" ]]; then
+ guessing_cc=1
+ if [[ -x $(dirname $0)/clang ]]; then
+ CC=$(dirname $0)/clang
+ elif [[ ! -z $(which clang) ]]; then
+ CC=$(which clang)
+ else
+ echo -n 'Error: could not find an appropriate compiler'
+ echo ' to generate build commands.' 1>&2
+ echo 'Use the CC environment variable to set one explicitly.' 1>&2
+ exit 1
+ fi
+fi
+
+if [[ -z "$CXX" ]]; then
+ if [[ -x $(dirname $0)/clang++ ]]; then
+ CXX=$(dirname $0)/clang++
+ elif [[ ! -z $(which clang++) ]]; then
+ CXX=$(which clang++)
+ else
+ CXX=$CC
+ fi
+fi
+
+diagtool=$(which diagtool)
+if [[ -z "$diagtool" ]]; then
+ if [[ -x $(dirname $0)/diagtool ]]; then
+ diagtool=$(dirname $0)/diagtool
+ else
+ echo 'Error: could not find diagtool.' 1>&2
+ exit 1
+ fi
+fi
+
+
+tool=$1
+shift
+
+if [[ -z "$tool" ]]; then
+ print_usage
+ exit 1
+elif [[ "$tool" == "xcodebuild" ]]; then
+ dry_run='-dry-run'
+ set_compiler="CC='$CC' CXX='$CXX'"
+elif [[ "$tool" == "make" ]]; then
+ dry_run='-n'
+ set_compiler="CC='$CC' CXX='$CXX'"
+else
+ echo "Warning: unknown build system '$tool'" 1>&2
+ if [[ $guessing_cc -eq 1 ]]; then
+ # FIXME: We really only need $CC /or/ $CXX
+ echo 'Error: $CC must be set for other build systems' 1>&2
+ exit 1
+ fi
+fi
+
+escape () {
+ echo $@ | sed 's:[]:\\|/.+*?^$(){}[]:\\&:g'
+}
+
+escCC=$(escape $CC)
+escCXX=$(escape $CXX)
+command=$(
+ eval $tool $dry_run $set_compiler $@ 2>/dev/null |
+ # Remove "if" early on so we can find the right command line.
+ sed $EXTENDED_SED_FLAG "s:^[[:blank:]]*if[[:blank:]]{1,}::g" |
+ # Combine lines with trailing backslashes
+ sed -e :a -e '/\\$/N; s/\\\n//; ta' |
+ grep -E "^[[:blank:]]*($escCC|$escCXX)" |
+ head -n1 |
+ sed $EXTENDED_SED_FLAG "s:($escCC|$escCXX):${diagtool//:/\\:} show-enabled:g"
+)
+
+if [[ -z "$command" ]]; then
+ echo 'Error: could not find any build commands.' 1>&2
+ if [[ "$tool" != "xcodebuild" ]]; then
+ # xcodebuild always echoes the compile commands on their own line,
+ # but other tools give no such guarantees.
+ echo -n 'This may occur if your build system embeds the call to ' 2>&1
+ echo -n 'the compiler in a larger expression. ' 2>&1
+ fi
+ exit 2
+fi
+
+# Chop off trailing '&&', '||', and ';'
+command=${command%%&&*}
+command=${command%%||*}
+command=${command%%;*}
+
+[[ -n "$verbose" ]] && echo $command
+eval $command