From: Ralf Habacker <ralf.habacker@freenet.de>
Date: Thu, 7 Apr 2022 11:53:42 +0000 (+0200)
Subject: cmake: Fix not detecting unsupported g++ related warning checks
X-Git-Tag: dbus-1.15.0~66^2~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbd3f90a8da990ff9a38761a0b5c2f467abdd84e;p=thirdparty%2Fdbus.git

cmake: Fix not detecting unsupported g++ related warning checks

Unsupported warnings are detected by cmake through errors during
compilation, which causes g++ not to detect them, since they are
only output as warnings. Setting -Werror ensures this.

Signed-off-by: Ralf Habacker <ralf.habacker@freenet.de>
---

diff --git a/cmake/modules/Macros.cmake b/cmake/modules/Macros.cmake
index 8d021d372..04ee287d3 100644
--- a/cmake/modules/Macros.cmake
+++ b/cmake/modules/Macros.cmake
@@ -124,6 +124,8 @@ include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 function(check_compiler_warning_flag _flag _result _cxx)
     string(MAKE_C_IDENTIFIER "${_flag}" _varname)
+    # required to get errors
+    list(APPEND _flag -Werror)
     if (_cxx)
         check_cxx_compiler_flag("${_flag}" HAVE_CXX_FLAG${_varname})
         set(${_result} ${HAVE_CXX_FLAG${_varname}} PARENT_SCOPE)