From 7e83cf1edac2a57c08ebb1ce7f21c2a539d5c300 Mon Sep 17 00:00:00 2001
From: Martin Liska <mliska@suse.cz>
Date: Mon, 15 Jul 2019 10:06:17 +0200
Subject: [PATCH] Fix missing return statements that are seen with
 -Werror=return-type.

Error example:

Code:

        #include <locale.h>
        int main () {
            /* If it's not defined as a macro, try to use as a symbol */
            #ifndef LC_MESSAGES
                LC_MESSAGES;
            #endif
        }
Compiler stdout:

Compiler stderr:
 In file included from /usr/include/locale.h:25,
                 from /tmp/tmpep_i4iwg/testfile.c:2:
/usr/include/features.h:382:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
  382 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
      |    ^~~~~~~
/tmp/tmpep_i4iwg/testfile.c: In function 'main':
/tmp/tmpep_i4iwg/testfile.c:8:9: error: control reaches end of non-void function [-Werror=return-type]
    8 |         }
      |         ^
cc1: some warnings being treated as errors

Upstream-Status: Backport
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 mesonbuild/compilers/c.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index b0096459..69cf84a4 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -387,6 +387,7 @@ class CCompiler(Compiler):
             #ifndef {symbol}
                 {symbol};
             #endif
+            return 0;
         }}'''
         return self.compiles(t.format(**fargs), env, extra_args=extra_args,
                              dependencies=dependencies)
@@ -563,6 +564,7 @@ class CCompiler(Compiler):
         {prefix}
         int main(int argc, char **argv) {{
             {type} something;
+            return 0;
         }}'''
         if not self.compiles(t.format(**fargs), env, extra_args=extra_args,
                              dependencies=dependencies):
@@ -598,6 +600,7 @@ class CCompiler(Compiler):
         {prefix}
         int main(int argc, char **argv) {{
             {type} something;
+            return 0;
         }}'''
         if not self.compiles(t.format(**fargs), env, extra_args=extra_args,
                              dependencies=dependencies):
@@ -672,6 +675,7 @@ class CCompiler(Compiler):
         #include <stdio.h>
         int main(int argc, char *argv[]) {{
             printf ("{fmt}", {cast} {f}());
+            return 0;
         }}'''.format(**fargs)
         res = self.run(code, env, extra_args=extra_args, dependencies=dependencies)
         if not res.compiled:
@@ -823,6 +827,7 @@ class CCompiler(Compiler):
                 #error "No definition for __builtin_{func} found in the prefix"
             #endif
         #endif
+        return 0;
         }}'''
         return self.links(t.format(**fargs), env, extra_args=extra_args,
                           dependencies=dependencies)
-- 
2.17.1