From 05d401104ee6b10699b7288ead044d6765b19c4d Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Thu, 17 Sep 2015 11:35:36 -0700
Subject: Fix QtCore compilation with clang

The .altmacro is not supported with Clang's integrated assembly.

The worst part is that I had this fixed, but apparently I never pushed
the update to Gerrit and then we staged the old version. This commit
brings back the fixes.

Incidentally, it also makes things work with freebsd-clang.

Change-Id: Id2a5d90d07d7ee470fcb9ad9696a9a0f9ced7ea7
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
---
 src/corelib/global/global.pri          | 28 ++++++++++++++++++++++++++--
 src/corelib/global/qversiontagging.cpp | 15 +++++++++++----
 2 files changed, 37 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/corelib/global/global.pri b/src/corelib/global/global.pri
index 8ecde5a769..eb8600f796 100644
--- a/src/corelib/global/global.pri
+++ b/src/corelib/global/global.pri
@@ -27,8 +27,7 @@ SOURCES += \
 	global/qmalloc.cpp \
         global/qnumeric.cpp \
         global/qlogging.cpp \
-        global/qhooks.cpp \
-        global/qversiontagging.cpp
+        global/qhooks.cpp
 
 # qlibraryinfo.cpp includes qconfig.cpp
 INCLUDEPATH += $$QT_BUILD_TREE/src/corelib/global
@@ -59,3 +58,28 @@ journald {
 syslog {
     DEFINES += QT_USE_SYSLOG
 }
+
+linux|freebsd {
+    VERSIONTAGGING_SOURCES = global/qversiontagging.cpp
+    ltcg|clang {
+        versiontagging_compiler.commands = $$QMAKE_CXX -c $(CXXFLAGS) $(INCPATH)
+
+        # Disable LTO, as the global inline assembly may not get processed
+        versiontagging_compiler.commands += -fno-lto
+
+        # Disable the integrated assembler for Clang, since it can't parse with
+        # the alternate macro syntax in use in qversiontagging.cpp
+        clang: versiontagging_compiler.commands += -no-integrated-as
+
+        versiontagging_compiler.commands += -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_IN}
+        versiontagging_compiler.dependency_type = TYPE_C
+        versiontagging_compiler.output = ${QMAKE_VAR_OBJECTS_DIR}${QMAKE_FILE_BASE}$${first(QMAKE_EXT_OBJ)}
+        versiontagging_compiler.input = VERSIONTAGGING_SOURCES
+        versiontagging_compiler.variable_out = OBJECTS
+        versiontagging_compiler.name = compiling[versiontagging] ${QMAKE_FILE_IN}
+        silent: versiontagging_compiler.commands = @echo compiling[versiontagging] ${QMAKE_FILE_IN} && $$versiontagging_compiler.commands
+        QMAKE_EXTRA_COMPILERS += versiontagging_compiler
+    } else {
+        SOURCES += $$VERSIONTAGGING_SOURCES
+    }
+}
diff --git a/src/corelib/global/qversiontagging.cpp b/src/corelib/global/qversiontagging.cpp
index e3d9efa16b..66d3f8d00f 100644
--- a/src/corelib/global/qversiontagging.cpp
+++ b/src/corelib/global/qversiontagging.cpp
@@ -33,18 +33,25 @@
 
 #include "qglobal.h"
 
-#if defined(Q_CC_GNU) && defined(Q_OS_LINUX) && defined(Q_PROCESSOR_X86) && !defined(QT_STATIC)
+#if defined(Q_CC_GNU) && (defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)) && defined(Q_PROCESSOR_X86) && !defined(QT_STATIC)
 # define SYM QT_MANGLE_NAMESPACE(qt_version_tag)
 # define SSYM QT_STRINGIFY(SYM)
 
 asm(
+// ASM macro that makes one ELF versioned symbol
+".macro     make_versioned_symbol    plainsym versionedsym\n"
+".globl     plainsym\n"
+".type      plainsym, @object\n"
+".size      plainsym, 1\n"
+".symver    plainsym, versionedsym\n"
+"plainsym :\n"
+".endm\n"
+
 // ASM macro that makes one ELF versioned symbol qt_version_tag{sep}Qt_{major}.{minor}
 // that is an alias to qt_version_tag_{major}_{minor}.
 // The {sep} parameter must be @ for all old versions and @@ for the current version.
 ".macro      make_one_tag    major minor sep\n"
-".globl      " SSYM "_\\major\\()_\\minor\n"                        // make the symbol global
-SSYM "_\\major\\()_\\minor:\n"                                      // declare it
-"    .symver " SSYM "_\\major\\()_\\minor, " SSYM "\\sep\\()Qt_\\major\\().\\minor\n"
+"       make_versioned_symbol   " SSYM "_\\major\\()_\\minor, " SSYM "\\sep\\()Qt_\\major\\().\\minor\n"
 ".endm\n"
 
 ".altmacro\n"
-- 
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