[oe-issues] [Bug 2154] New: snes9x-sdl-1.39 compilation error and alignment runtime errors

[bugzilla-daemon at tinman.treke.net]

http://bugs.openembedded.org/show_bug.cgi?id=2154

           Summary: snes9x-sdl-1.39 compilation error and alignment runtime
                    errors
           Product: Openembedded
           Version: Angstrom
          Platform: ARM
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Distributions
        AssignedTo: openembedded-issues at lists.openembedded.org
        ReportedBy: manuel.teira at telefonica.net
         QAContact: tinderbox-oe at gmx.net


Trying to compile, gcc-4.1 complains about linkage conflicts:

| arm-angstrom-linux-gnueabi-g++ -march=armv5te -mtune=xscale -fno-rtti
-fno-exceptions
-I/home/mteira/oeroot/build/tmp/staging/arm-angstrom-linux-gnueabi/include
-I/home/mteira/oeroot/build/tmp/staging/arm-angstrom-linux-gnueabi/include/SDL
-D_REENTRANT -c -D_ZAURUS -Os -ffast-math -fstrict-aliasing
-fomit-frame-pointer -I. -Iunzip -D__linux -DZLIB -DVAR_CYCLES -DCPU_SHUTDOWN
-DSPC700_SHUTDOWN    -DSPC700_C  -DUNZIP_SUPPORT     -DNO_INLINE_SET_GET
data.cpp -o data.o
| arm-angstrom-linux-gnueabi-g++ -march=armv5te -mtune=xscale -fno-rtti
-fno-exceptions
-I/home/mteira/oeroot/build/tmp/staging/arm-angstrom-linux-gnueabi/include
-I/home/mteira/oeroot/build/tmp/staging/arm-angstrom-linux-gnueabi/include/SDL
-D_REENTRANT -c -D_ZAURUS -Os -ffast-math -fstrict-aliasing
-fomit-frame-pointer -I. -Iunzip -D__linux -DZLIB -DVAR_CYCLES -DCPU_SHUTDOWN
-DSPC700_SHUTDOWN    -DSPC700_C  -DUNZIP_SUPPORT     -DNO_INLINE_SET_GET
globals.cpp -o globals.o
| dsp1.h:238: error: previous declaration of 'SDSP1 DSP1' with 'C++' linkage
| globals.cpp:76: error: conflicts with new declaration with 'C' linkage
| make: *** [globals.o] Error 1
| FATAL: oe_runmake failed
NOTE: Task failed:
/home/mteira/oeroot/build/tmp/work/armv5te-angstrom-linux-gnueabi/snes9x-sdl-1.39-r2/temp/log.do_compile.1649


Also, while running, sound is corrupted, and a lot of missalignment traps are
produced, leading to very bad performance.

I'm attaching a patch where:

1.-The linkage type is changed in dsp1.h for an extern struct.
2.-Added an __attribute__((aligned(4))) to the audio buffer, where access was
triggering the alignment traps (it seems that gcc3 was producing different
alignments)
3.-The recipe is updated to use the new patch and the version is bumped up to
r3.


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