[Pkg-gnupg-commit] [gpgme] 217/412: m4: Add compile / link check for qt

[Daniel Kahn Gillmor]

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dkg pushed a commit to branch master
in repository gpgme.

commit ed070313155a1c79a57ba69f4299f2aefc65fad7
Author: Andre Heinecke <aheinecke at intevation.de>
Date:   Mon Jul 11 18:47:11 2016 +0200

    m4: Add compile / link check for qt
    
    * m4/qt.m4 (FIND_QT): Check if a qt application can be compiled and
    linked.
    
    --
    In case gpgme is cross compiled pkg-config may pick up qt
    for the build system and not for the host system. To avoid that
    we check that we can compile a qt program for host.
---
 m4/qt.m4 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/m4/qt.m4 b/m4/qt.m4
index d3be7f8..1acae81 100644
--- a/m4/qt.m4
+++ b/m4/qt.m4
@@ -52,5 +52,27 @@ AC_DEFUN([FIND_QT],
         MOC=$MOC2
       fi
     fi
+    AC_MSG_RESULT([$mocversion])
+    dnl Check that a binary can actually be build with this qt.
+    dnl pkg-config may be set up in a way that it looks also for libaries
+    dnl of the build system and not only for the host system. In that case
+    dnl we check here that we can actually compile / link a qt application
+    dnl for host.
+    OLDCPPFLAGS=$CPPFLAGS
+    CPPFLAGS=$GPGME_QT_CFLAGS
+    OLDLDFLAGS=$LDFLAGS
+    LDFLAGS=$GPGME_QT_LIBS
+    AC_LANG_PUSH(C++)
+    AC_MSG_CHECKING([whether a simple qt program can be built])
+    AC_LINK_IFELSE([AC_LANG_SOURCE([
+    #include <QCoreApplication>
+    int main (int argc, char **argv) {
+    QCoreApplication app(argc, argv);
+    app.exec();
+    }])], [have_qt5_libs='yes'], [have_qt5_libs='no'])
+    AC_MSG_RESULT([$have_qt5_libs])
+    AC_LANG_POP()
+    CPPFLAGS=$OLDCPPFLAGS
+    LDFLAGS=$OLDLDFLAGS
   fi
 ])

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