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List:       gcc
Subject:    #include<altivec> fails on darwin
From:       Kaspar Fischer <fischerk () inf ! ethz ! ch>
Date:       2002-08-07 16:36:15
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Dear developers,
I have just build gcc-3.1.1 on MacOS 10.1.5 and tried to compile the 
following program with Altivec instructions:

   #include <altivec.h> // (*)

   int main() {
     vector unsigned char  v0;
     vector unsigned short v1;
     int     g10;

     g10 = 0;
     v1 = vec_splat_u16 ( 9 );
     v0 = vec_lvsl ( g10, (int *)&v1 );
     v1 = vec_sr ( ( vector unsigned short ) v0,  v1 );

     return 0;
   }

That is, I put the above lines into the file constants.c and did a

    g++ -Wa,-force_cpusubtype_ALL -mabi=altivec -maltivec \
    constants.c -o tmp

This produces a huge number of errors, all similar to the first one:

In file included from constants.c:1:
/usr/local/gcc-3.1.1/lib/gcc-lib/powerpc-apple-
darwin5.5/3.1.1/include/altivec.h:124:
  declaration
    of C function `vector float vec_ctf(vector int, char)' conflicts with
/usr/local/gcc-3.1.1/lib/gcc-lib/powerpc-apple-
darwin5.5/3.1.1/include/altivec.h:123:
  previous
    declaration `vector float vec_ctf(vector unsigned int, char)' here
...

However, if I change the line marked with a (*) in the original program 
to:

    #include "/usr/local/gcc-3.1.1/lib/gcc-lib/powerpc-apple-
darwin5.5/3.1.1/include/alt\
ivec.h"

then the program compiles fine.  What am I doing wrong?

Many thanks for your help,
Kaspar

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