[GNUnet-SVN] [gnurl] 132/208: curl-compilers.m4: disable warning spam with Cygwin's clang

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ng0 pushed a commit to annotated tag gnurl-7.55.0
in repository gnurl.

commit deadb2348f40e7afa46a03a918f522c67145ebe0
Author: Marcel Raad <address@hidden>
AuthorDate: Sat Jul 8 17:44:34 2017 +0200

    curl-compilers.m4: disable warning spam with Cygwin's clang
    
    When building with Cygwin or MinGW, libtool uses a wrapper executable
    instead of a wrapper script [1], which is written in C and throws
    missing-variable-declarations warnings. Don't enable these warnings on
    Cygwin and MinGW in order to avoid warnings for every executable built,
    which spams the test suite output when using Cygwin's clang.
    
    [1] 
https://www.gnu.org/software/libtool/manual/html_node/Wrapper-executables.html
    
    Closes https://github.com/curl/curl/pull/1665
---
 m4/curl-compilers.m4 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index dcd96ed54..3c87efa09 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -903,7 +903,15 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           #
           dnl Only clang 3.2 or later
           if test "$compiler_num" -ge "302"; then
-            tmp_CFLAGS="$tmp_CFLAGS -Wmissing-variable-declarations"
+            case $host_os in
+            cygwin* | mingw*)
+              dnl skip missing-variable-declarations warnings for cygwin and
+              dnl mingw because the libtool wrapper executable causes them
+              ;;
+            *)
+              tmp_CFLAGS="$tmp_CFLAGS -Wmissing-variable-declarations"
+              ;;
+            esac
           fi
           #
           dnl Only clang 3.6 or later

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