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Re: Pedantic error on address-of main breaks libjava bootstrap

Andrew Haley wrote:
Aaron W. LaFramboise wrote: 
When building libjava stacktrace.o on i386-pc-mingw32, bootstrap fails
with:

./sysdep/backtrace.h: In function '_Unwind_Reason_Code
fallback_backtrace(_Unwind_Reason_Code (*)(_Unwind_Context*, void*),
_Jv_UnwindState*)':
./sysdep/backtrace.h:107: error: ISO C++ forbids taking address of
function '::main'

On mingw32, backtrace.h is a symlink or copy to i386/backtrace.h, which
is what has this problem:

      if (ctx.meth_addr == (_Jv_uintptr_t)jv_runmain
          || ctx.meth_addr == (_Jv_uintptr_t)_Jv_ThreadStart
          || (ctx.meth_addr - (_Jv_uintptr_t)main) < 16)
        break;

The code needs the address of main to stop the unwind.  What is the
proper way to suppress this warning?  __extension__ doesn't seem to help.

(I'm actually not sure what has changed to cause this warning to start
happening now.)

Please send the command line that led to this.

Here's the complete command line.

/mingw/src/gccf/./gcc/xgcc -shared-libgcc -B/mingw/src/gccf/./gcc -nostdinc++ -L/mingw/src/gccf/i386-pc-mingw32/libstdc++-v3/src -L/mingw/src/gccf/i386-pc-mingw32/libstdc++-v3/src/.libs -L/mingw/src/gccf/i386-pc-mingw32/winsup/mingw -L/mingw/src/gccf/i386-pc-mingw32/winsup/w32api/lib -isystem /mingw/src/svn/winsup/mingw/include -isystem /mingw/src/svn/winsup/w32api/include -B/mingw/i386-pc-mingw32/bin/ -B/mingw/i386-pc-mingw32/lib/ -isystem /mingw/i386-pc-mingw32/include -isystem /mingw/i386-pc-mingw32/sys-include -DHAVE_CONFIG_H -I. -I../../../svn/libjava -I./include -I./gcj -I../../../svn/libjava -Iinclude -I../../../svn/libjava/include -I../../../svn/libjava/classpath/include -Iclasspath/include -I../../../svn/libjava/classpath/native/fdlibm -I../../../svn/libjava/../boehm-gc/include -I../boehm-gc/include -I../../../svn/libjava/libltdl -I../../../svn/libjava/libltdl -I../../../svn/libjava/.././libjava/../gcc -I../../../svn/libjava/../zlib -I../../../svn/libjava/../libffi/include -I../libffi/include -fno-rtti -fnon-call-exceptions -mthreads -fdollars-in-identifiers -Wswitch-enum -D_FILE_OFFSET_BITS=64 -ffloat-store -fomit-frame-pointer -Usun -fno-omit-frame-pointer -Wextra -Wall -D_GNU_SOURCE -DPREFIX=\"/mingw\" -DTOOLEXECLIBDIR=\"/mingw/lib/gcc/i386-pc-mingw32/4.4.0\" -DJAVA_HOME=\"/mingw\" -DBOOT_CLASS_PATH=\"/mingw/share/java/libgcj-4.4.0.jar\" -DJAVA_EXT_DIRS=\"/mingw/share/java/ext\" -DGCJ_ENDORSED_DIRS=\"/mingw/share/java/gcj-endorsed\" -DGCJ_VERSIONED_LIBDIR=\"/mingw/lib/gcj-4.4.0-10\" "-DPATH_SEPARATOR=\";\"" -DECJ_JAR_FILE=\"\" -DLIBGCJ_DEFAULT_DATABASE=\"/mingw/lib/gcj-4.4.0-10/classmap.db\" -DLIBGCJ_DEFAULT_DATABASE_PATH_TAIL=\"gcj-4.4.0-10/classmap.db\" -g -O2 -MT stacktrace.lo -MD -MP -MF .deps/stacktrace.Tpo -c ../../../svn/libjava/stacktrace.cc -DDLL_EXPORT -DPIC -o .libs/stacktrace.o

Sorry, I noticed now that there isn't actually a -pedantic anywhere in there. Removing -Wextra and -Wall have no effect, so this is obviously a default error. Adding -fpermissive turns the error into a warning.

What do you think?

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