#!/bin/sh
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# This script is invoked by Android build system "WITH_SYNTAX_CHECK=1 make ..." and
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# accepts command line in the following format:
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#
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# ccc-syntax ARCH LOCAL_CC ...
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#
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# It calls "clang -fsyntax-only ..." to utilize clang's better diagnostics
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# before calling "LOCAL_CC ..." for code generation. ARCH is translated
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# into "-target XXX" (see below) to get proper pre-defined preprocessor
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# symbols/macros. Some clang-specific warnings are disabled to be compatible
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# with Android toolchain mostly gcc.
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#
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# The compilation time is slightly longer, and the generated object file
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# should be the same as w/o WITH_SYNTAX_CHECK
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#
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# Note that although Android build system doesn't call LOCAL_CC with any of
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# the following flags, this script should check and skip "clang -fsyntax-only"
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# if options contain any of the following: '-print-*', '-dump*', '@*', '-E',
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# '-' or '-M', for use elsewhere.
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#
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ARCH="$1"
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LOCAL_CC="$2"
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shift ; shift
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# Turn on syntax-only
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CLANG_FLAGS="-fsyntax-only"
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# Turn off warning about unused options
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CLANG_FLAGS="$CLANG_FLAGS -Qunused-arguments"
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# Turn off unknown warning options
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CLANG_FLAGS="$CLANG_FLAGS -Wno-unknown-warning-option"
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# Define WITH_SYNTAX_CHECK for code wish to behave differently when check
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CLANG_FLAGS="$CLANG_FLAGS -DWITH_SYNTAX_CHECK"
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# If LOCAL_CC is not clang and not compiling in c++ mode, turn on -std=gnu89 by default
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# and let "$@" later override it, if any
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test "$LOCAL_CC" != "${LOCAL_CC%-x c++}" -o "$LOCAL_CC" = "${LOCAL_CC%-xc++}" && cxx_mode=true
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if [ "$LOCAL_CC" = "${LOCAL_CC%clang}" -a "$cxx_mode" != "true" ] ; then
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CLANG_FLAGS="$CLANG_FLAGS -std=gnu89"
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fi
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# Turn off warnings which aren't useful in this context
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CLANG_FLAGS="$CLANG_FLAGS -Wno-ignored-attributes -Wno-pedantic -Wno-builtin-requires-header -Wno-gnu -Wno-gnu-designator -Wno-knr-promoted-parameter"
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if [ "$ARCH" != "host" ]; then
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# Add target to get proper pre-defined preprocessor symbols/macros.
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case $ARCH in
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arm) CLANG_FLAGS="$CLANG_FLAGS -target armv5te-none-linux-androideabi"
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;;
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mips) CLANG_FLAGS="$CLANG_FLAGS -target mipsel-none-linux-android"
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;;
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x86) CLANG_FLAGS="$CLANG_FLAGS -target i686-none-linux-android"
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;;
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esac
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if [ "$LOCAL_CC" != "${LOCAL_CC%clang*}" ]; then
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# Don't look for its own lib/clang/x.y/include when LOCAL_CC is clang
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# which is rebuilt from source w/o installing its include as well
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CLANG_FLAGS="$CLANG_FLAGS -nostdinc"
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fi
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else
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# Note that unlike target flags where Android build system explicitly specify
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# everything in command line, host tools have their own sysroot and --sysroot
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# isn't explicitly added in the commmand line. Likelywise for other gcc implicit
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# search directories.
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#
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# We can query search paths by doing "gcc -v" and parsing the output with
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# sed -n '1,/BEGIN/!{ /END/,/BEING/!p; }' (*1), but forking gcc here adds overhead.
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# Because host tool refresh only once 1-2 year, here we hard-code the path obtained by (*2).
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# ToDo: The build system can do it once for each module, although it still needs to
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# prepare both -m32 and -m64 versions, anding 2 more args in additional to $ARCH
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# and $LOCAL_CC
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#
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# (*1) as described in http://sed.sourceforge.net/sedfaq4.html#s4.24
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# (*2) prebuilts/tools/gcc-sdk/gcc -m64 -v -E - < /dev/null 2>&1 | \
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# sed -n '1,/> search starts here/!{ /End of search list/,/> search starts here/!p; }' |\
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# sed -e 's/^/-I/'
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# Likewise for -m32
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#
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# Please refer to prebuilts/tools/gcc-sdk/gcc for similar trick to determine
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# bitness
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options=" ${@} " # sentinel prefix/suffix space to simplify pattern match below
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suffix_m32=${options##* -m32 } # suffix after the last -m32
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suffix_m64=${options##* -m64 } # suffix after the last -m64
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len_m32=${#suffix_m32} # length of suffix after the last -m32
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len_m64=${#suffix_m64} # length of suffix after the last -m64
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if [ $len_m32 -ge $len_m64 ] ; then
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read -d '' CLANG_FLAGS_END <<"EOF"
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-I prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6/lib/gcc/x86_64-linux/4.6.x-google/include
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-I prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6/lib/gcc/x86_64-linux/4.6.x-google/include-fixed
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-I prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6/x86_64-linux/include
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-I prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6/sysroot/usr/include
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EOF
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else
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read -d '' CLANG_FLAGS_END <<"EOF"
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-I prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6/lib/gcc/i686-linux/4.6.x-google/include
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-I prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6/lib/gcc/i686-linux/4.6.x-google/include-fixed
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-I prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6/i686-linux/include
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-I prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6/sysroot/usr/include
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EOF
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fi
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fi
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# Turn off warnings (at the end) on features we exploit
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CLANG_FLAGS_END="$CLANG_FLAGS_END -Wno-return-type-c-linkage"
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# Call it
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`dirname $0`/analyzer $CLANG_FLAGS "$@" $CLANG_FLAGS_END
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if [ "$?" != 0 ]; then
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test $WITH_SYNTAX_CHECK -ge 2 && echo '*** ERROR ***': `dirname $0`/analyzer $CLANG_FLAGS "$@" $CLANG_FLAGS_END
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exit 1
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fi
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$LOCAL_CC "$@"
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