[Octave-bug-tracker] [bug #61668] [octave-forge] (gsl) configure tests fail because main is defined with no return type

[Carlo de Falco]

URL:
  <https://savannah.gnu.org/bugs/?61668>

                 Summary: [octave-forge] (gsl) configure tests fail because
main is defined with no return type
                 Project: GNU Octave
            Submitted by: cdf
            Submitted on: Mon 13 Dec 2021 04:25:59 PM CET
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: Patch Submitted
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.0.90
         Discussion Lock: Any
        Operating System: Any

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Details:

Installing the gsl on Octave 6.3 fails because 
the configure script fails to detect 6.3 features.

the reason for the failure is that the tests defined
in configure define main with no return type, which causes
the tests to fail with the error 


 error: C++ requires a type specifier for all declarations


regardless of the Octave version being used

I tested this with clang++ on macos but suspect the same
would happen on other systems

the following change fixes the problem for me


$ diff -u configure.ac.in configure.ac.in.new 
--- configure.ac.in     2021-12-13 16:16:41.000000000 +0100
+++ configure.ac.in.new 2021-12-13 16:15:25.000000000 +0100
@@ -82,7 +82,7 @@
   [AC_LANG_SOURCE(
      [[
 #include "ov-scalar.h"
-main()
+int main()
 {
   octave_scalar x (1.234);
   bool y = x.isreal ();
@@ -102,7 +102,7 @@
 #include "ov-scalar.h"
 #include "ovl.h"
 #include "parse.h"
-main()
+int main()
 {
   octave_value_list ovl = octave::feval ("sin", octave_value (1.234));
   return 0;
-varbatim-




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