[Bug sanitizer/56781] New: boostrap-asan failure: fixincl fails to link (missing -lasan)

["aldot at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56781

             Bug #: 56781
           Summary: boostrap-asan failure: fixincl fails to link (missing
                    -lasan)
    Classification: Unclassified
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: sanitizer
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: aldot@gcc.gnu.org
                CC: dodji@gcc.gnu.org, dvyukov@gcc.gnu.org,
                    jakub@gcc.gnu.org, kcc@gcc.gnu.org


bootstrap on x86_64-linux-gnu fails with:

/scratch/obj.x86_64/gcc-4.9.mine/./gcc/xgcc
-B/scratch/obj.x86_64/gcc-4.9.mine/./gcc/
-B/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/bin/
-B/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/lib/ -isystem
/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/include -isystem
/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/sys-include    -Og -g3 -ggdb3
-static-libstdc++ -static-libgcc  -o fixincl fixincl.o fixtests.o fixfixes.o
server.o procopen.o fixlib.o fixopts.o ../libiberty/libiberty.a 
../libiberty/libiberty.a(regex.o): In function `byte_compile_range':
/scratch/obj.x86_64/gcc-4.9.mine/libiberty/../../../src/gcc-4.9.mine/libiberty/regex.c:4499:
undefined reference to `__asan_report_store1'
/scratch/obj.x86_64/gcc-4.9.mine/libiberty/../../../src/gcc-4.9.mine/libiberty/regex.c:4499:
undefined reference to `__asan_report_load1'
[snip]

we would obviously need to link against asan but it is not immediately obvious
to me how to pass POSTSTAGE1_LDFLAGS to fixincludes/

$ /scratch/obj.x86_64/gcc-4.9.mine/./gcc/xgcc
-B/scratch/obj.x86_64/gcc-4.9.mine/./gcc/
-B/scratch/obj.x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/libsanitizer/asan
-B/scratch/obj.x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/libsanitizer/asan/.libs
-B/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/bin/
-B/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/lib/ -isystem
/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/include -isystem
/opt/x86_64/gcc-4.9.mine/x86_64-unknown-linux-gnu/sys-include    -Og -g3 -ggdb3
-static-libstdc++ -static-libgcc  -o fixincl fixincl.o fixtests.o fixfixes.o
server.o procopen.o fixlib.o fixopts.o ../libiberty/libiberty.a
-fsanitize=address -static-libasan
produces the desired fixincl

$ /scratch/obj.x86_64/gcc-4.9.mine/./gcc/xgcc -v
Using built-in specs.
COLLECT_GCC=/scratch/obj.x86_64/gcc-4.9.mine/./gcc/xgcc
Target: x86_64-unknown-linux-gnu
Configured with: ../../src/gcc-4.9.mine/configure -v
--enable-languages=c,lto,fortran,c++,go LD=/usr/bin/ld.bfd CFLAGS='-O2 -g3
-ggdb3' CXXFLAGS='-O2 -g3 -ggdb3' 'BOOT_CFLAGS=-O2 -g3 -ggdb3'
'BOOT_CXXFLAGS=-O2 -g3 -ggdb3' 'CFLAGS_FOR_TARGET=-Og -g3 -ggdb3'
'CXXFLAGS_FOR_TARGET=-Og -g3 -ggdb3' --prefix=/opt/x86_64/gcc-4.9.mine//
--enable-shared --with-system-zlib --enable-nls --without-included-gettext
--enable-threads=posix --program-suffix=-4.9.mine-HEAD
--with-build-config=bootstrap-asan --enable-__cxa_atexit
--enable-libstdcxx-allocator=mt --enable-clocale=gnu --enable-libstdcxx-debug
--enable-mpfr --disable-werror --enable-checking=yes --enable-debug -C
--disable-intermodule --enable-multilib --disable-libstdcxx-pch
--enable-bootstrap --enable-checking=release --with-cpu=native
--with-tune=native --enable-plugin
Thread model: posix
gcc version 4.9.0 20130327 (experimental) [vnhoist revision
32ddde1:a851c38:065ec6e627efa59b32f9fb743368a4a55c4ac310] (GCC)