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Re: -findirect-dispatch: broken on Linux, working on Mingw?

From: Marco Trudel <mtrudel at gmx dot ch>
To: Andrew Haley <aph at redhat dot com>
Cc: GCC Java <java at gcc dot gnu dot org>
Date: Fri, 09 Mar 2007 13:34:20 +0100
Subject: Re: -findirect-dispatch: broken on Linux, working on Mingw?
References: <45EE9322.2020708@gmx.ch> <17902.38882.589721.35398@zebedee.pink> <45EEA51F.2020109@gmx.ch> <17902.50141.658335.965437@zebedee.pink> <45F14B2D.8050602@gmx.ch> <17905.20371.876621.578934@zebedee.pink>

Andrew Haley wrote:

Marco Trudel writes: > Andrew Haley wrote: > > Marco Trudel writes: > > > Andrew Haley wrote: > > > > Marco Trudel writes: > > > > > Hey all > > > > > > > > > > I once started a discussion that ecj1 can't be compiled for a host=Linux > > > > > target=Linux static gcj: http://gcc.gnu.org/ml/java/2007-01/msg00082.html > > > > > Back then, no one knew why the error occurred. I think I now stumbled > > > > > over the answer: > > > > > > > > > > Having Test.java as a simple "HelloWorld" and working with the compiled > > > > > class: > > > > > > > > > > On Linux: > > > > > --------- > > > > > > > > > > static-gcj-for-lin Test.class --main=Test -findirect-dispatch > > > > > -> /tmp/ccq2qpMg.o: In function `main':cc3Fk97a.i:(.text+0x30): > > > > > undefined reference to `JvRunMainName' > > > > > collect2: ld returned 1 exit status > > > > > > > > > > static-gcj-for-win Test.class --main=Test -findirect-dispatch > > > > > -> works > > > > > > > > > > > > > I just can't imagine how indirect dispatch is ever going to work with > > > > static linking. > > > > > > I don't know what indirect dispatch exactly does. > > > But I know that it perfectly works with gcc 4.2. So it looks to me > > > like it's a regression. > > > > Indirect dispatch works by postponing all linking until runtime: > > whenever a class is referenced, libgcj searches all the jarfiles and > > shared libraries it knows about to satisfy the reference. So, no java > > libraries (apart from the dummy libgcj-bc.so) are linked into the > > executable. With static linking, this will cause problems, because > > the linker can't possibly know what compiled code it needs to link > > into the executable. > > I usually put all the needed source into the binary, so that won't be a > problem.

OK.

> > It is possible that this might work by accident, if you just happened > > to include the classes you were going to need. Or, maybe very careful > > manual linking would allow you to add all the classes you knew you > > were going to need at runtime. But in that case you might as well > > link without indirect dispatch. > > I need indirect-dispatch for compiling large applications. They > usually have a couple of jars. These jars then reference a ton of > other jars which are never used, but referenced anyhow. So I either > need them to compile the jars, or ignore the references. If I > search and download the missing jars, they usually too reference a > bunch of other jars and so on... So I go for ignoring the > references and use indirect-dispatch. Is there a better way to > solve this problem?
Yes, but you know already.  Indirect dispatch and shared libraries is
the right answer to this problem.

I prefer compiling my jars into the binary instead of creating a shared lib for each jar (or one lib for all jars). Specially because I want to do it the same way on Windows as on Linux and on Windows, creating dlls is currently broken. Otherwise that would be an option.

 > Solving all dependencies only needs very much time and creates huge
 > binaries...
> > > > It certainly isn't designed to, and there are lots of > > > > good technical reasons for believing it can't. The linker can't see > > > > the symbols indirect dispatch uses, so can't find out what objects need > > > > to be linked into the program. > > > > > > > > > Any direct ideas? Otherwise I'll add a bugreport. > > > > > > > > Short of fixing Mingw to work properly with shared libraries, no. > > > > > > It works in GCC 4.2 for Linux and Mingw as well as in GCC 4.3 for Mingw. > > > So it more looks like Linux should be fixed instead of Mingw broken to > > > be consistent ;-) > > > > The point of indirect dispatch is to be able to upgrade the libraries > > on a box without recompiling any of the applications. or indeed any > > other library. You can even replace libgcj itself with a new library, > > and the precompiled applications continue to work. > > So, the missing references make sense. But why did it work in GCJ 4.2?

Probably because of the libgcj-bc library changes.

Ok...

> Maybe it was intentionally but broken in the mean time? > Or maybe the linker changed? I think I updated binutils for 4.3... > > > However, if you really do want to do this weird thing, this link line > > in install/lib/libgcj.spec might work after a fashion: > > > > *lib: %{static-libgcj:-non_shared -lgcj -call_shared;:%{s-bc-abi:-lgcj_bc;:-lgcj}} -lm -lpthread -lrt -ldl %(libgcc) %(liborig) > > No, that doesn't fix it.
I tried it, and it works for me on GNU/Linux.  We need the output
using "gcj -v" to know why it failed in your case.


Attached:
newLib.txt: Compilation output with your *lib: ... line.
oldLib.txt: Compilation output with the original *lib: ... line.

I should mention that I work on 32bit Windows with a static GCJ rev 122233. The libgcj.spec is used, I removed the *lib line and got another error.


thanks
Marco

Using built-in specs.
Reading specs from c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/lib/libgcj.spec
rename spec startfile to startfileorig
rename spec lib to liborig
Target: i686-pc-linux-gnu
Configured with: /usr/local/src/gcc/configure --prefix=/home/Marco/Desktop/compile-win-lin/gcc-XYZXYZ-lin --with-sysroot=/home/Marco/Desktop/compile-win-lin/gcc-XYZXYZ-lin/sys-root --build=i686-pc-linux-gnuaout --host=i686-pc-mingw32 --target=i686-pc-linux-gnu --enable-languages=c,c++,java --enable-libgcj --disable-shared --with-gnu-as --with-gnu-ld --disable-nls --disable-debug --disable-checking --enable-threads=posix --disable-win32-registry --enable-java-gc=boehm --enable-java-maintainer-mode --with-gmp=/home/Marco/Desktop/compile-win-lin/gmp-out --with-mpfr=/home/Marco/Desktop/compile-win-lin/mpfr-out
Thread model: posix
gcc version 4.3.0 20070222 (experimental)
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/jc1.exe Test.class -fhash-synchronization -fno-use-divide-subroutine -fuse-boehm-gc -fnon-call-exceptions -fkeep-inline-functions -quiet -dumpbase Test.class -mtune=generic -auxbase Test -g1 -version -findirect-dispatch -fbootclasspath=./;c:\programme\javanativecompiler-1.1.1\gcc-122233-lin\bin\../lib/gcc/../../share/java/libgcj-4.3.0.jar -o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccsXaaaa.s
GNU Java version 4.3.0 20070222 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 4.3.0 20070222 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130990
Class path starts here:
    ./
    ./ (system)
    c:\programme\javanativecompiler-1.1.1\gcc-122233-lin\bin\../lib/gcc/../../share/java/libgcj-4.3.0.jar/ (system) (zip)
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/bin/as.exe -V -Qy -o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccKKbaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccsXaaaa.s
GNU assembler version 2.16.91 (i686-pc-linux-gnu) using BFD version 2.16.91 20060119
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/jvgenmain.exe -findirect-dispatch Testmain C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2xcaaa.i
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/cc1.exe C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2xcaaa.i -quiet -dumpbase Testmain.c -mtune=generic -g1 -version -fdollars-in-identifiers -o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccsXaaaa.s
GNU C version 4.3.0 20070222 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 4.3.0 20070222 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130990
Compiler executable checksum: 76b60d9b77b6a31f619099639ae7bb5f
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/bin/as.exe -V -Qy -o C:\DOKUME~1\Marco\LOKALE~1\Temp/cckldaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccsXaaaa.s
GNU assembler version 2.16.91 (i686-pc-linux-gnu) using BFD version 2.16.91 20060119
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/collect2.exe -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crt1.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crti.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/crtbegin.o -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0 -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/lib -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/lib -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib C:\DOKUME~1\Marco\LOKALE~1\Temp/cckldaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccKKbaaa.o -lgcc -lgcj_bc -lm -lpthread -lrt -ldl -lgcc -lc -lgcc c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/crtend.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crtn.o
C:\DOKUME~1\Marco\LOKALE~1\Temp/cckldaaa.o: In function `main':cc2xcaaa.i:(.text+0x30): undefined reference to `JvRunMainName'
collect2: ld returned 1 exit status

Using built-in specs.
Reading specs from c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/lib/libgcj.spec
rename spec startfile to startfileorig
rename spec lib to liborig
Target: i686-pc-linux-gnu
Configured with: /usr/local/src/gcc/configure --prefix=/home/Marco/Desktop/compile-win-lin/gcc-XYZXYZ-lin --with-sysroot=/home/Marco/Desktop/compile-win-lin/gcc-XYZXYZ-lin/sys-root --build=i686-pc-linux-gnuaout --host=i686-pc-mingw32 --target=i686-pc-linux-gnu --enable-languages=c,c++,java --enable-libgcj --disable-shared --with-gnu-as --with-gnu-ld --disable-nls --disable-debug --disable-checking --enable-threads=posix --disable-win32-registry --enable-java-gc=boehm --enable-java-maintainer-mode --with-gmp=/home/Marco/Desktop/compile-win-lin/gmp-out --with-mpfr=/home/Marco/Desktop/compile-win-lin/mpfr-out
Thread model: posix
gcc version 4.3.0 20070222 (experimental)
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/jc1.exe Test.class -fhash-synchronization -fno-use-divide-subroutine -fuse-boehm-gc -fnon-call-exceptions -fkeep-inline-functions -quiet -dumpbase Test.class -mtune=generic -auxbase Test -g1 -version -findirect-dispatch -fbootclasspath=./;c:\programme\javanativecompiler-1.1.1\gcc-122233-lin\bin\../lib/gcc/../../share/java/libgcj-4.3.0.jar -o C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2Xaaaa.s
GNU Java version 4.3.0 20070222 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 4.3.0 20070222 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130990
Class path starts here:
    ./
    ./ (system)
    c:\programme\javanativecompiler-1.1.1\gcc-122233-lin\bin\../lib/gcc/../../share/java/libgcj-4.3.0.jar/ (system) (zip)
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/bin/as.exe -V -Qy -o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccULbaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2Xaaaa.s
GNU assembler version 2.16.91 (i686-pc-linux-gnu) using BFD version 2.16.91 20060119
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/jvgenmain.exe -findirect-dispatch Testmain C:\DOKUME~1\Marco\LOKALE~1\Temp/ccMzcaaa.i
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/cc1.exe C:\DOKUME~1\Marco\LOKALE~1\Temp/ccMzcaaa.i -quiet -dumpbase Testmain.c -mtune=generic -g1 -version -fdollars-in-identifiers -o C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2Xaaaa.s
GNU C version 4.3.0 20070222 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 4.3.0 20070222 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130990
Compiler executable checksum: 76b60d9b77b6a31f619099639ae7bb5f
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/bin/as.exe -V -Qy -o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccEndaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/cc2Xaaaa.s
GNU assembler version 2.16.91 (i686-pc-linux-gnu) using BFD version 2.16.91 20060119
 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../libexec/gcc/i686-pc-linux-gnu/4.3.0/collect2.exe -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crt1.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crti.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/crtbegin.o -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0 -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/../../../../i686-pc-linux-gnu/lib -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/lib -Lc:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib C:\DOKUME~1\Marco\LOKALE~1\Temp/ccEndaaa.o C:\DOKUME~1\Marco\LOKALE~1\Temp/ccULbaaa.o -lgcc -lgcj_bc -lm -lpthread -lrt -ldl -lgcc -lc -lgcc c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../lib/gcc/i686-pc-linux-gnu/4.3.0/crtend.o c:/programme/javanativecompiler-1.1.1/gcc-122233-lin/bin/../sys-root/usr/lib/crtn.o
C:\DOKUME~1\Marco\LOKALE~1\Temp/ccEndaaa.o: In function `main':ccMzcaaa.i:(.text+0x30): undefined reference to `JvRunMainName'
collect2: ld returned 1 exit status

Follow-Ups:
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Andrew Haley

References:
- -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Marco Trudel
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Andrew Haley
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Marco Trudel
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Andrew Haley
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Marco Trudel
- Re: -findirect-dispatch: broken on Linux, working on Mingw?
  - From: Andrew Haley

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