PACKAGE NAME
------------
neko_libunistring


SOURCE/VERSION
--------------
libunistring-0.9.10 / 1


IRIX/MIPSPRO VERSION
--------------------
6.5.22m / 7.4.4m


ENVIRONMENT VARIABLES
---------------------
setenv CC c99
setenv CFLAGS '-O2 -mips4 -n32'
setenv LDFLAGS -L/usr/nekoware/lib
setenv MAKE /usr/nekoware/bin/gmake
setenv PERL /usr/nekoware/bin/perl
setenv PATH /usr/nekoware/bin:$PATH

For systems with an R4x00 processor, use
setenv CFLAGS '-O2 -mips3 -n32'


PATCH
-----
cd libunistring-0.9.10
patch -p0 < libunistring-0.9.10_irix.patch


CONFIGURE FLAGS
---------------
./configure --disable-rpath --prefix=/usr/nekoware --with-libiconv-prefix=/usr/nekoware


BUILD
-----
gmake
gmake check
gmake install


KNOWN DEPENDENCIES
------------------
neko_libiconv 5
perl and gmake to build the package


ERRORS/MISCELLANEOUS
--------------------
This package has dual support for both mips3 and mips4 architecture, controlled by the mach(CPUARCH=R4000) switch for libraries and executables.

The patch resolves some trivial issues with _Bool types in function prototypes and a more problematic piece of code, possibly a bug, in lib/unistr/u8-strchr.c
It uses a combined expression in three 'if' statements, where a char* array is tested for zeroes, but some tests are past it's allocated memory region. See f.i. line 175:

if (*s == 0 || s[1] == 0 || s[2] == 0 || s[3] == 0)

When s is allocated as a single NULL byte, the above expression would segfault since there is no s[1 .. 3] . This depends on the compiler optimizing the code, (and it is okay for -O1) but -O2 tries to be smart and possibly inserts code which out-of-order prefetches the other instructions.
Rolling it out and nesting with 'if-else' didn't work because of that out-of-order optimization of MIPSPro so i made a new function which does the zero check.


The test from 'gmake check' produces the following result:
============================================================================
Testsuite summary for 
============================================================================
# TOTAL: 512
# PASS:  487
# SKIP:  25
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0


PACKAGED BY
-----------

S/N   VER      PORTER                          Date
---------------------------------------------------------
1     0.9.10   Frank Everdij (dexter1)         10-06-2018