invalid source character: backslash in macro

[Marutks]

I am trying to compile some code that has multiline macros.

/* ***************************************************************** */
#define loop_body(rs,ls,step)                                  \
      x = S;                                /* feedback constant     */ \
      x ^= A[i+step-t5];                    /* end-around feedback   */ \
      x ^= A[i+step-t0];                    /* linear feedback       */ \
      x ^= ( A[i+step-t1] & A[i+step-t2] ); /* first quadratic term  */ \
      x ^= ( A[i+step-t3] & A[i+step-t4] ); /* second quadratic term */ \
      x ^= (x >> rs);                       /* right-shift           */ \
      A[i+step] = x ^ (x << ls);            /* left-shift            */  
/* ***************************************************************** */

Sun compiler gives this error:

cc -c -g -w -o build/Debug/SunStudio_12.1-Solaris-x86/md6_compress.o md6_compress.c
"md6_compress.c", line 218: invalid source character: '\'

[MK27]

I doubt this will make much difference but you could try putting it inside a block ({)

[P4R4N01D]

In addition, remove the '\'s. Worth a try.

[Salem]

> In addition, remove the '\'s. Worth a try.
Macro definitions are always single line.
So to write a complex macro, using \ is essential to keep the meaning of the macro intact.

My only suggestion at the moment is to make sure there is no white-space (or other invisible characters) after each \
Each should be immediately followed by a newline.

[Marutks]

There is no space after \. Even this c macro example doesn't compile:

#define SWAP(a, b)  {          \
                        a ^= b;         \
                        b ^= a;         \
                        a ^= b;         \
                    }

invalid source character: '\'

It compiles with gcc though. It seems that "\" isn't supported in sun compiler.

[bithub]

I wonder if it's a line termination issue. Do you have dos2unix on your computer? If so, can you run it on your source file(s) and see if that fixes the compile error?

[Salem]

Look at some other source (reasonably large and complicated). I'd be surprised if the compiler was completely broken over something as basic as parsing \

I agree with bithub, look at line terminations.

[Marutks]

yes, dos2unix fixed the problem with /.

Now I got another error:

cc -m64 -o dist/Debug/SunStudio_12.1-Solaris-x86/md6 build/Debug/SunStudio_12.1-Solaris-x86/md6_compress.o build/Debug/SunStudio_12.1-Solaris-x86/md6sum.o build/Debug/SunStudio_12.1-Solaris-x86/md6_nist.o build/Debug/SunStudio_12.1-Solaris-x86/md6_mode.o
Undefined first referenced
symbol in file
ticks build/Debug/SunStudio_12.1-Solaris-x86/md6sum.o

function ticks() is defined in file md6sum.c like this:

#if defined _MSC_VER

/* Microsoft */
#include <intrin.h>
#pragma intrinsic(__rdtsc)
uint64_t ticks()
{
return __rdtsc();
}

#else

/* GCC */
#include <stdint.h>
inline uint64_t ticks() {
  /* read timestamp counter */
  uint32_t lo, hi;
  asm volatile (
		"xorl %%eax,%%eax \n        cpuid"
		::: "%rax", "%rbx", "%rcx", "%rdx");
  asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
  return (uint64_t)hi << 32 | lo;
} 

#endif

[Marutks]

"extern inline" fixed that