ZMQ-LibCZMQ1 RHEL-5 / gcc-4.1.2 fix

[maage]

There is problem when probing functions at toos/zmqcheck. At RHEL-5 all functions are found available and then it does not work.

At RHEL-5 there is gcc 4.1.2 and it does not return error when function is not declared when using -Wall -std=c99 -pedantic-errors.

$ cat foo.c
int main(void) {
   this_is_not_defined();
   return (0);
}
$ gcc -Wall  -std=c99 -pedantic-errors foo.c -c;echo $?
foo.c: In function ‘main’:
foo.c:2: warning: implicit declaration of function ‘this_is_not_defined’
0

If I add -Werror-implicit-function-declaration

$ gcc -Wall  -std=c99 -pedantic-errors -Werror-implicit-function-declaration foo.c -c;echo $?
foo.c: In function ‘main’:
foo.c:2: error: implicit declaration of function ‘this_is_not_defined’
1
$ 

So I've used this patch to build it:

--- ZMQ-LibCZMQ1-0.03-/tools/zmqcheck/Makefile.PL       2013-01-09 08:21:55.000000000 +0200
+++ ZMQ-LibCZMQ1-0.03/tools/zmqcheck/Makefile.PL        2013-05-12 16:37:45.000000000 +0300
@@ -39,7 +39,7 @@
     $postamble .= sprintf <<'EOM', ($func) x 3;
 %s:

-       @$(CC) -c $(PASTHRU_INC) $(INC) $(CCFLAGS) $(OPTIMIZE) $(CCCDLFLAGS) "-I$(PERL_INC)" $(PASTHRU_DEFINE) $(DEFINE) $(EXTRALIBS) -std=c99 -pedantic-errors %s.c -o %s.o >> zmqcheck.out 2>&1
+       @$(CC) -c $(PASTHRU_INC) $(INC) $(CCFLAGS) $(OPTIMIZE) $(CCCDLFLAGS) "-I$(PERL_INC)" $(PASTHRU_DEFINE) $(DEFINE) $(EXTRALIBS) -std=c99 -Werror-implicit-function-declaration -pedantic-errors %s.c -o %s.o >> zmqcheck.out 2>&1

 EOM
 }

But I think some other strategy might be in order to to probing properly.

Later gcc versions (RHEL-6 / gcc-4.4.6) work as expected without any patching.