我希望能够查看一个基本的Qt4应用程序在通过Valgrind运行时从简单的Makefile编译中会发生什么。是什么导致了这些泄漏？我在我的端上删除了任何动态分配的对象。当退出程序时，我只单击右上角的关闭（X）按钮。GUI库是否根本不释放它们malloc()的任何内存？
从qmake命令减少的Makefile如下：
唯一的源代码是：
从qmake命令减少的Makefile如下：
####### Compiler, tools and options
CXX = g++
CXXFLAGS = -pipe -O2 -Wall -W
LIBS_INCLUDE = ${HOME}
INCPATH = -I$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/mkspecs/default \
-I. \
-I$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/include/QtCore \
-I$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/include/QtGui \
-I$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/include
LINK = g++
LFLAGS = -Wl,-O1 -Wl,-rpath,$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/lib
LIBS = $(SUBLIBS) -L$(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/lib -lQtGui -lQtCore -lpthread
QMAKE = $(LIBS_INCLUDE)/QtSDK/Desktop/Qt/473/gcc/bin/qmake
OBJECTS_DIR = ./
SOURCES = main.cpp
OBJECTS = main.o
QMAKE_TARGET = Main
TARGET = Main
####### Build rules
first: all
all: $(TARGET)
$(TARGET): $(OBJECTS)
$(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJCOMP) $(LIBS)
####### Compile
main.o: main.cpp
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o main.o main.cpp
唯一的源代码是：
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget window;
window.resize( 320,240 );
window.setWindowTitle(
QApplication::translate( "toplevel", "Top-level Widget" ) );
window.show( );
QPushButton *button = new QPushButton(
QApplication::translate( "childwidget", "Press me"), &window );
button->move( 100, 100 );
button->show( );
delete button;
return app.exec();
}
当我通过valgrind运行时，我得到以下结果（中间部分已被删除）：
==3836== Memcheck, a memory error detector
==3836== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==3836== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
==3836== Command: ./Main
==3836==
Xlib: extension "RANDR" missing on display ":0.0".
==3836==
==3836== HEAP SUMMARY:
==3836== in use at exit: 924,383 bytes in 8,679 blocks
==3836== total heap usage: 37,234 allocs, 28,555 frees, 4,314,180 bytes allocated
==3836==
==3836== 1 bytes in 1 blocks are possibly lost in loss record 1 of 4,534
==3836== at 0x400677E: malloc (vg_replace_malloc.c:195)
==3836== by 0xA1DFA4: g_malloc (in /lib/libglib-2.0.so.0.2600.0)
==3836== by 0xA37F29: g_strdup (in /lib/libglib-2.0.so.0.2600.0)
==3836== by 0xB2A6FA: g_param_spec_string (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0x41F36473: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836== by 0xB3D237: g_type_class_ref (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB20B38: g_object_newv (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB212EF: g_object_new (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0x41F34857: gtk_settings_get_for_screen (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836== by 0x41ED0CB6: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836== by 0xB377C7: g_cclosure_marshal_VOID__OBJECT (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB1ABE2: g_closure_invoke (in /lib/libgobject-2.0.so.0.2600.0)
==3836==
...
==3836==
==3836== 23,048 bytes in 1 blocks are possibly lost in loss record 4,531 of 4,534
==3836== at 0x400677E: malloc (vg_replace_malloc.c:195)
==3836== by 0x16F42D: ??? (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x17400B: ft_mem_qalloc (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x174063: ft_mem_alloc (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x174508: ft_mem_qrealloc (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x17457F: ft_mem_realloc (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x1A2E52: ??? (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x1A709B: ??? (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x180338: ??? (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x175B5D: ??? (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x1780B0: FT_Open_Face (in /usr/lib/libfreetype.so.6.6.0)
==3836== by 0x1791FF: FT_New_Face (in /usr/lib/libfreetype.so.6.6.0)
==3836==
==3836== 53,244 bytes in 29 blocks are possibly lost in loss record 4,534 of 4,534
==3836== at 0x400677E: malloc (vg_replace_malloc.c:195)
==3836== by 0xA1DFA4: g_malloc (in /lib/libglib-2.0.so.0.2600.0)
==3836== by 0xA36050: g_slice_alloc (in /lib/libglib-2.0.so.0.2600.0)
==3836== by 0xA36315: g_slice_alloc0 (in /lib/libglib-2.0.so.0.2600.0)
==3836== by 0xB40077: g_type_create_instance (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB1CE35: ??? (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB205C6: g_object_newv (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0xB212EF: g_object_new (in /lib/libgobject-2.0.so.0.2600.0)
==3836== by 0x54B8FA3: ??? (in /usr/lib/gtk-2.0/2.10.0/engines/libclearlooks.so)
==3836== by 0x41F0CDDD: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836== by 0x41F11C24: gtk_rc_get_style (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836== by 0x4200A81F: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
==3836==
==3836== LEAK SUMMARY:
==3836== definitely lost: 1,912 bytes in 7 blocks
==3836== indirectly lost: 5,060 bytes in 250 blocks
==3836== possibly lost: 491,358 bytes in 2,893 blocks
==3836== still reachable: 426,053 bytes in 5,529 blocks
==3836== suppressed: 0 bytes in 0 blocks
==3836== Reachable blocks (those to which a pointer was found) are not shown.
==3836== To see them, rerun with: --leak-check=full --show-reachable=yes
==3836==
==3836== For counts of detected and suppressed errors, rerun with: -v
==3836== ERROR SUMMARY: 1336 errors from 1336 contexts (suppressed: 114 from 11)