Hi,

I am puzzled by the failure to cross compile with recent FPC versions.

Cross compilation from Ubuntu 32 bit to Win32, WIn64, and Linux 64 works well with FPC 2.6.0.

With FPC 2.7.1, any cross compilation yields a 'cannot find -lgcc' error.

With FPC 2.6.3, cross compilation to Win32 and Win64 succeeds while cross compilation to Linux 64 yields the same error.

Any bit of advice?

Stephano

In our previous episode, patspiper said:

Cross compilation from Ubuntu 32 bit to Win32, WIn64, and Linux 64 works well with FPC 2.6.0. With FPC 2.7.1, any cross compilation yields a 'cannot find -lgcc' error.

Linking what file generates that error when crosscompiling to win32 or win64?

Below is the relevant part of the log for Win32 with FPC2.7.1 (fpmake.pp):

make -C packages smart
make[2]: Entering directory
`/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages' make -C fpmkunit bootstrap
make[3]: Entering directory
`/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/fpmkunit' /bin/mkdir -p units_bs/i386-linux
/home/me/Programs/fpc/fpsrc/exported/2.7.1/compiler/ppc src/fpmkunit.pp -n -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/units/i386-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/paszlib -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/fcl-process -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/hash -FUunits_bs/i386-linux -Fu../paszlib/src -Fu../hash/src -Fi../paszlib/src -Fi../fcl-process/src/unix -Fu../fcl-process/src -Fi../fcl-process/src/linux -Fi../fcl-process/src/dummy -Xd -Xt -gl make[3]: Leaving directory
`/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/fpmkunit' /home/me/Programs/fpc/fpsrc/exported/2.7.1/compiler/ppc fpmake.pp -n -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/fpmkunit/units_bs/i386-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/units/i386-linux -Xd -Xt -gl
/usr/bin/ld: warning: link.res contains output sections; did you forget -T? /home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/units/i386-linux/cthreads.o: In function `CTHREADS_$$_init':
/home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/linux/../unix/cthreads.pp:1032: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking /usr/bin/ld: cannot find -lgcc
fpmake.pp(33,1) Error: Error while linking
fpmake.pp(33,1) Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted
make[2]: *** [fpmake] Error 1
make[2]: Leaving directory
`/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages' make[1]: *** [packages_smart] Error 2

Linux 64 with FPC2.6.3 fails while linking fpdoc.pp: /home/me/Programs/fpc/fpsrc/exported/2.6.3/compiler/ppcrossx64 -Px86_64 -XPx86_64-linux- -Xr
-Fl/home/me/Programs/fpc/crossbinutils/lib//x86_64-linux -Ur -Xs -O2 -n -S2h
-Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/rtl/units/x86_64-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/packages/fcl-base/units/x86_64-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/packages/iconvenc/units/x86_64-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/packages/fcl-xml/units/x86_64-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/packages/fcl-passrc/units/x86_64-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.6.3/packages/chm/units/x86_64-linux -FD/home/me/Programs/fpc/crossbinutils/bin -FE. -FUunits/x86_64-linux -Cg -Flinclude -Fl/etc/ld.so.conf.d/*.conf -Xd -Xt -gl -dx86_64 -dRELEASE fpdoc.pp
/home/me/Programs/fpc/crossbinutils/bin/x86_64-linux-ld: warning: ./link.res contains output sections; did you forget -T? /home/me/Programs/fpc/crossbinutils/bin/x86_64-linux-ld: cannot find -lgcc /home/me/Programs/fpc/crossbinutils/bin/x86_64-linux-ld: cannot find -lc

Stephano

Just to clarify: It is the building of the cross compiler that fails.

Stephano

Bump

Note: I have submitted 2 related bug reports:
http://bugs.freepascal.org/view.php?id=24262
http://bugs.freepascal.org/view.php?id=24372

Stephano

Hi Stephano,

I have been having a number of problems that look similar to this in several ways.

I'm trying to chase down what's going wrong and I'll let you know what I discover.

First up I noticed in your log that the linker reports:

/home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/linux/../unix/cthreads.pp:1032: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

AFAIK it should not be statically linked. Here's how I ran into the same problem:

http://lists.freepascal.org/lists/fpc-pascal/2013-May/038242.html

There may be a clue in your log:

/home/me/Programs/fpc/fpsrc/exported/2.7.1/compiler/ppc fpmake.pp -n -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/packages/fpmkunit/units_bs/i386-linux -Fu/home/me/Programs/fpc/fpsrc/exported/2.7.1/rtl/units/i386-linux -Xd -Xt -gl

shows the -Xt switch is selected. I don't think it should be but Jonas would need to chime on on this. I'm looking into this apropos my builds of the RTL for cross targets.

I also found that libgcc is not pulled into the link in some cases. In my case it depends on something in the crossroot (against which one's linking) at least in my case:

http://lists.freepascal.org/lists/fpc-pascal/2013-May/038242.html

Again, I don't know what's happening here but I want to find out.

I've also discovered that the switch -XR used to to prefix search paths when cross compiling is problematic in some cases:

http://lists.freepascal.org/lists/fpc-pascal/2013-May/038223.html

I hope this helps. Bruce.