>> Further investigation shown that compiler takes about 1GB(!) of memory 
>> when
>> it compiles php5.3-200906221030/ext/fileinfo/libmagic/apprentice.c
>> On some systems this amount of memory is not available and may lead to
>> errors such as hangs or crashes.
>>
>> Is it a known problem?
>> Is this requirement specified somewhere?
>> Can it be fixed or improved?
>
> Try compiling with -O0

unfortunately, it did not help (tried with fresh sources):

/bin/sh 
/home/jvlad/php/php5.3-200906221030/libtool --silent --preserve-dup-deps 
--mode=compile 
gcc -I/home/jvlad/php/php5.3-200906221030/ext/fileinfo/libmagic -Iext/fileinfo/ 
 -I/home/jvlad/php/php5.3-200906221030/ext/fileinfo/ -DPHP_ATOM_INC 
-I/home/jvlad/php/php5.3-200906221030/include 
 -I/home/jvlad/php/php5.3-200906221030/main 
-I/home/jvlad/php/php5.3-200906221030 
 -I/home/jvlad/php/php5.3-200906221030/ext/date/lib 
-I/home/jvlad/php/php5.3-200906221030/ext/ereg/regex 
 -I/home/jvlad/php/install/include/libxml2 
-I/home/jvlad/php/php5.3-200906221030/ext/sqlite3/libsqlite 
 -I/home/jvlad/php/php5.3-200906221030/TSRM 
-I/home/jvlad/php/php5.3-200906221030/Zend 
  -I/usr/pkg/include  -I/usr/include -O0  -c 
/home/jvlad/php/php5.3-200906221030/ext/fileinfo/libmagic/apprentice.c -o 
ext/fileinfo/libmagic/apprentice.lo
gcc: Internal error: Killed (program cc1)
Please submit a full bug report.
See <URL:http://www.netbsd.org/Misc/send-pr.html> for instructions.
*** Error code 1

Stop.
make: stopped in /home/jvlad/php/php5.3-200906221030



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