06-15-2019
Probably, placement has to do with word boundaries. Which vary with different OS and hardware. As Don mentioned clearly. gcc has options for packing objects in memory. try gcc -Q -v inputfilename.c - assuming that is what you used. Be prepared for a lot of information on your screen.
Last edited by jim mcnamara; 06-15-2019 at 07:46 PM..
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LEARN ABOUT NETBSD
genassym.cf
GENASSYM.CF(5) BSD File Formats Manual GENASSYM.CF(5)
NAME
genassym.cf -- assym.h definition file
DESCRIPTION
The genassym.cf file is used by genassym(1) to make constant C expressions known to assembler source files. Lines starting with '#' are dis-
carded by genassym(1). Lines starting with include, ifdef, if, else or endif are preceded with '#' and passed otherwise unmodified to the C
compiler. Lines starting with quote get passed on with the quote command removed. The first word after a define command is taken as a CPP
identifier and the rest of the line has to be a constant C expression. The output of genassym(1) will assign the numerical value of this
expression to the CPP identifier. export X is a shorthand for define X X. struct X remembers X for the member command and does a define
X_SIZEOF sizeof(X). member X does a define X offsetof(<last struct>, X). config <ctype> <gcc constraint> <asm print modifier> can be used
to customize the output of genassym(1). When producing C output, values are casted to <ctype> (default: long) before they get handed to
printf. <gcc constraint> (default: n) is the constraint used in the __asm__ statements. <asm print modifier> (default: empty) can be used to
force gcc to output operands in different ways then normal. The "a" modifier e.g. stops gcc from emitting immediate prefixes in front of con-
stants for the i386 and m68k port.
FILES
/usr/src/sys/arch/${MACHINE}/${MACHINE}/genassym.cf
SEE ALSO
genassym(1)
HISTORY
The genassym.cf file appeared in NetBSD 1.3.
BSD
August 18, 2005 BSD