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Re: Problems building ecos sources
On Fri, 2006-02-24 at 18:14 +0100, Andrew Lunn wrote:
> > [dfernandez@software RB]$ ecosconfig new pc_i82559 redboot U
> > CYGSEM_HAL_USE_ROM_MONITOR, new inferred value 0
> > U CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK, new inferred value 0
> > [dfernandez@software RB]$ ecosconfig
> > import /opt/ecos/packages/hal/i386/pc/cu..rrent/misc/redboot_FLOPPY_SMP.ecm
> > ...change prefix to i586-elf...
> > [dfernandez@software RB]$ ecosconfig check
> > Target: pc_i82559
> > Template: redboot
> > Added:
> > CYGPKG_IO_ETH_DRIVERS
> > No conflicts
> > [dfernandez@software RB]$ ecosconfig tree
> > [dfernandez@software RB]$ make
> > ...
> > make[1]: Leaving directory
> > `/home/dfernandez/Projects/eCos/RB/infra/current'
> > make -r -C redboot/current build
> > make[1]: Entering directory
> > `/home/dfernandez/Projects/eCos/RB/redboot/current'
> > i586-elf-gcc -c -I/home/dfernandez/Projects/eCos/RB/install/include
> > -I/opt/ecos/packages/redboot/current
> > -I/opt/ecos/packages/redboot/current/src
> > -I/opt/ecos/packages/redboot/current/tests -I.
> > -I/opt/ecos/packages/redboot/current/src/ -finline-limit=7000 -Wall
> > -Wpointer-arith -Wstrict-prototypes -Winline -Wundef -g -O2
> > -ffunction-sections -fdata-sections -fno-exceptions
> > -Wp,-MD,src/main.tmp -o
> > src/redboot_main.o /opt/ecos/packages/redboot/current/src/main.c
> > /opt/ecos/packages/redboot/current/src/main.c: In function ???cyg_start???:
> > /opt/ecos/packages/redboot/current/src/main.c:397: error: invalid lvalue
> > in assignment
> > /opt/ecos/packages/redboot/current/src/main.c: In function ???do_go???:
> > /opt/ecos/packages/redboot/current/src/main.c:597: error: invalid lvalue
> > in assignment
> > make[1]: *** [src/main.o.d] Error 1
> > make[1]: Leaving directory
> > `/home/dfernandez/Projects/eCos/RB/redboot/current'
> > make: *** [build] Error 2
> >
> > May be that there's something wrong with this ecos version?
>
> I'm guessing you have a very new gcc. gcc has slowly been becoming
> more strict about lvalues, ie the left hand side of an assignment. For
> quite a while casts on the left hand side have caused warnings. I'm
> guessing the gcc folks have gone a stage further and turned something
> else into an error. My gcc 4.0.4 compiles this part of the code fine,
> but gives warnings in other places.
>
> The problem we have is that the lines with errors are actually
> macros. And the macros are quite big:
>
> It is defined in cyg/hal/hal_arch.h
>
> #define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ ) \
> CYG_MACRO_START \
> register CYG_WORD* _sp_ = ((CYG_WORD*)((_sparg_) &~15)); \
> register CYG_WORD *_fpspace_ = NULL; \
> register HAL_SavedRegisters *_regs_; \
> \
> HAL_THREAD_INIT_FPU_CONTEXT_SPACE( _sp_, _fpspace_ ); \
> *(--_sp_) = (CYG_WORD)(0); \
> *(--_sp_) = (CYG_WORD)(0); \
> *(--_sp_) = (CYG_WORD)(_thread_); \
> *(--_sp_) = (CYG_WORD)(0); \
> \
> _regs_ = (HAL_SavedRegisters *) \
> ((unsigned long)_sp_ - sizeof(HAL_SavedRegisters)); \
> HAL_THREAD_INIT_FPU_CONTEXT( _regs_, _fpspace_ ); \
> _regs_->eflags = (CYG_WORD)(0x00000200); \
> _regs_->cs = (CYG_WORD)(CYG_HAL_DEFAULT_CS); \
> _regs_->pc = (CYG_WORD)(_entry_); \
> _regs_->vector = (CYG_WORD)(_id_); \
> _regs_->esp = (CYG_WORD) _sp_-4; \
> _regs_->ebp = (CYG_WORD)(_id_); \
> _regs_->esi = (CYG_WORD)(_id_); \
> _regs_->edi = (CYG_WORD)(_id_); \
> _regs_->eax = (CYG_WORD)(_id_); \
> _regs_->ebx = (CYG_WORD)(_id_); \
> _regs_->ecx = (CYG_WORD)(_id_); \
> _regs_->edx = (CYG_WORD)(_id_); \
> (_sparg_) = (CYG_ADDRESS) _regs_; \
> CYG_MACRO_END
>
> Could you try to work out which specific line is causing problems.
> Comment half of the macro out and see if it compiles. The binary chop
> depending on if it compiles or does not compile...
>
> I would also be interested in knowing what version of gcc you have.
>
> Thanks
> Andrew
>
>
The problem seems to be in the last line:
(_sparg_) = (CYG_ADDRESS) _regs_; \
My gcc version is 4.0.2:
[dfernandez@software RB]$ i586-elf-gcc -v
Using built-in specs.
Target: i586-elf
Configured with: /usr/src/redhat/BUILD/gcc-4.0.2/configure --prefix=/usr/local/ecos --target=i586-elf --enable-languages=c,c++ --with-gnu-as --with-gnu-ld --with-newlib --with-gxx-include-dir=/usr/local/ecos/i586-elf/include -v
Thread model: single
gcc version 4.0.2
David.
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