From Joel Sherrill: Gcc on the head fails to compile arm-rtems4.7 at the following point when Ada is enabled. ../../xgcc -B../../ -c -g -O2 -W -Wall -gnatpg s-auxdec.adb -o s-auxdec.o s-auxdec.ads:286:13: alignment for "Aligned_Word" must be at least 4 The code is: type Aligned_Word is record Value : Short_Integer; end record; for Aligned_Word'Alignment use Integer'Min (2, Standard'Maximum_Alignment); I (Laurent) think Standard'Maximum_Alignment comes from ada/targtyps.c get_target_maximum_alignment (void) { return BIGGEST_ALIGNMENT / BITS_PER_UNIT; } Joel confirmed that changing "Min (2" to "Min (4" enable this file to be compiled, however my reading of the source would imply that BIGGEST_ALIGNMENT is at least 32 on arm, so something else must be at play here, any idea?
> Joel confirmed that changing "Min (2" to "Min (4" enable this file to be > compiled, however my reading of the source would imply that BIGGEST_ALIGNMENT > is at least 32 on arm, so something else must be at play here, any idea? Excerpt from config/arm/arm.h: /* Setting STRUCTURE_SIZE_BOUNDARY to 32 produces more efficient code, but the value set in previous versions of this toolchain was 8, which produces more compact structures. The command line option -mstructure_size_boundary=<n> can be used to change this value. For compatibility with the ARM SDK however the value should be left at 32. ARM SDT Reference Manual (ARM DUI 0020D) page 2-20 says "Structures are aligned on word boundaries". The AAPCS specifies a value of 8. */ #define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary extern int arm_structure_size_boundary; /* This is the value used to initialize arm_structure_size_boundary. If a particular arm target wants to change the default value it should change the definition of this macro, not STRUCTURE_SIZE_BOUNDARY. See netbsd.h for an example of this. */ #ifndef DEFAULT_STRUCTURE_SIZE_BOUNDARY #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 32 #endif
Subject: Bug 24857 Author: guerby Date: Thu Nov 17 11:13:18 2005 New Revision: 107116 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=107116 Log: 2005-11-17 Laurent GUERBY <laurent@guerby.net> PR ada/24857 * s-auxdec-empty.ads, s-auxdec-empty.adb: New files. Added: trunk/gcc/ada/s-auxdec-empty.adb trunk/gcc/ada/s-auxdec-empty.ads Modified: trunk/gcc/ada/ChangeLog
Subject: Bug 24857 Author: guerby Date: Fri Nov 18 11:44:20 2005 New Revision: 107175 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=107175 Log: 2005-11-18 Laurent GUERBY <laurent@guerby.net> PR ada/24857 * Makefile.in: Use s-auxdec-empty for RTEMS. Modified: trunk/gcc/ada/ChangeLog trunk/gcc/ada/Makefile.in
arm-rtems4.7 now builds. The empty version is used for all RTEMS target. Thanks.