windows - warning: cannot find entry symbol nable-stdcall-fixup; defaulting

Question

This mingw contains gcc 4.6.3, with name - i686-w64-mingw32.

On Windows, a Qt's.pro file w.r.t a hello world program:

QT          += core gui
TEMPLATE    = app
TARGET      = ef

SOURCES     = ef.cpp
DEPENDPATH  += .

INCLUDEPATH += . 
INCLUDEPATH += c:/R-2.15.1/include
INCLUDEPATH += c:/R-2.15.1/library/Rcpp/include
INCLUDEPATH += c:/R-2.15.1/library/RInside/include

LIBS        += -L c:/R-2.15.1/bin/i386 -lR
LIBS        += -L c:/R-2.15.1/library/Rcpp/libs/i386 -lRcpp
LIBS        += -L c:/R-2.15.1/library/RInside/libs/i386 -lRInside 

The program compiles as follows:

Notice there is a warning at the end.

System PATH is as follows:

Qt's Path:

Please point out the point that I am missing.

UPDATE:

---

Now I have updated the qmake.conf as follows:

#
# qmake configuration for win32-g++
#
# Written for MinGW
#

MAKEFILE_GENERATOR  = MINGW
TEMPLATE        = app
CONFIG          += qt warn_on release link_prl copy_dir_files debug_and_release debug_and_release_target precompile_header
QT          += core gui
DEFINES         += UNICODE QT_LARGEFILE_SUPPORT
QMAKE_COMPILER_DEFINES  += __GNUC__ WIN32

QMAKE_EXT_OBJ           = .o
QMAKE_EXT_RES           = _res.o

QMAKE_CC        = gcc
QMAKE_LEX       = flex
QMAKE_LEXFLAGS      =
QMAKE_YACC      = byacc
QMAKE_YACCFLAGS     = -d
QMAKE_CFLAGS        =
QMAKE_CFLAGS_DEPS   = -M
QMAKE_CFLAGS_WARN_ON    = -Wall
QMAKE_CFLAGS_WARN_OFF   = -w
QMAKE_CFLAGS_RELEASE    = -O2
QMAKE_CFLAGS_DEBUG  = -g
QMAKE_CFLAGS_YACC   = -Wno-unused -Wno-parentheses

QMAKE_CXX       = g++
QMAKE_CXXFLAGS      = $$QMAKE_CFLAGS
QMAKE_CXXFLAGS_DEPS = $$QMAKE_CFLAGS_DEPS
QMAKE_CXXFLAGS_WARN_ON  = $$QMAKE_CFLAGS_WARN_ON
QMAKE_CXXFLAGS_WARN_OFF = $$QMAKE_CFLAGS_WARN_OFF
QMAKE_CXXFLAGS_RELEASE  = $$QMAKE_CFLAGS_RELEASE
QMAKE_CXXFLAGS_DEBUG    = $$QMAKE_CFLAGS_DEBUG
QMAKE_CXXFLAGS_YACC = $$QMAKE_CFLAGS_YACC
QMAKE_CXXFLAGS_THREAD   = $$QMAKE_CFLAGS_THREAD
QMAKE_CXXFLAGS_RTTI_ON  = -frtti
QMAKE_CXXFLAGS_RTTI_OFF = -fno-rtti
QMAKE_CXXFLAGS_EXCEPTIONS_ON = -fexceptions -mthreads
QMAKE_CXXFLAGS_EXCEPTIONS_OFF = -fno-exceptions

QMAKE_INCDIR        =
QMAKE_INCDIR_QT     = $$[QT_INSTALL_HEADERS]
QMAKE_LIBDIR_QT     = $$[QT_INSTALL_LIBS]

QMAKE_RUN_CC        = $(CC) -c $(CFLAGS) $(INCPATH) -o $obj $src
QMAKE_RUN_CC_IMP    = $(CC) -c $(CFLAGS) $(INCPATH) -o $@ $<
QMAKE_RUN_CXX       = $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $obj $src
QMAKE_RUN_CXX_IMP   = $(CXX) -c $(CXXFLAGS) $(INCPATH) -o $@ $<

QMAKE_LINK      = g++
QMAKE_LINK_C        = gcc
QMAKE_LFLAGS        = -Wl, -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc
QMAKE_LFLAGS_EXCEPTIONS_ON = -mthreads
QMAKE_LFLAGS_EXCEPTIONS_OFF =
QMAKE_LFLAGS_RELEASE    = -Wl,-s
QMAKE_LFLAGS_DEBUG  =
QMAKE_LFLAGS_CONSOLE    = -Wl,-subsystem,console
QMAKE_LFLAGS_WINDOWS    = -Wl,-subsystem,windows
QMAKE_LFLAGS_DLL        = -shared
QMAKE_LINK_OBJECT_MAX   = 10
QMAKE_LINK_OBJECT_SCRIPT= object_script


QMAKE_LIBS      =
QMAKE_LIBS_CORE         = -lkernel32 -luser32 -lshell32 -luuid -lole32 -ladvapi32 -lws2_32
QMAKE_LIBS_GUI          = -lgdi32 -lcomdlg32 -loleaut32 -limm32 -lwinmm -lwinspool -lws2_32 -lole32 -luuid -luser32 -ladvapi32
QMAKE_LIBS_NETWORK      = -lws2_32
QMAKE_LIBS_OPENGL       = -lopengl32 -lglu32 -lgdi32 -luser32
QMAKE_LIBS_COMPAT       = -ladvapi32 -lshell32 -lcomdlg32 -luser32 -lgdi32 -lws2_32
QMAKE_LIBS_QT_ENTRY     = -lmingw32 -lqtmain

!isEmpty(QMAKE_SH) {
    MINGW_IN_SHELL      = 1
    QMAKE_DIR_SEP       = /
    QMAKE_COPY      = cp
    QMAKE_COPY_DIR      = xcopy /s /q /y /i
    QMAKE_MOVE      = mv
    QMAKE_DEL_FILE      = rm
    QMAKE_MKDIR     = mkdir
    QMAKE_DEL_DIR       = rmdir
    QMAKE_CHK_DIR_EXISTS = test -d
} else {
    QMAKE_COPY      = copy /y
    QMAKE_COPY_DIR      = xcopy /s /q /y /i
    QMAKE_MOVE      = move
    QMAKE_DEL_FILE      = del
    QMAKE_MKDIR     = mkdir
    QMAKE_DEL_DIR       = rmdir
    QMAKE_CHK_DIR_EXISTS    = if not exist
}

QMAKE_MOC       = $$[QT_INSTALL_BINS]$${DIR_SEPARATOR}moc.exe
QMAKE_UIC       = $$[QT_INSTALL_BINS]$${DIR_SEPARATOR}uic.exe
QMAKE_IDC       = $$[QT_INSTALL_BINS]$${DIR_SEPARATOR}idc.exe

QMAKE_IDL       = midl
QMAKE_LIB       = ar -ru
QMAKE_RC        = windres
QMAKE_ZIP       = zip -r -9

QMAKE_STRIP     = strip
QMAKE_STRIPFLAGS_LIB    += --strip-unneeded
load(qt_config)

The errors have now changed to:

UPDATE

I just removed the space between Wl, and -enable-std.. and the above error is gone:

Answer 1

As seen in this merge request there is a bug in the qmake.conf file which configures the variables used whenever you use the default configuration of qmake.

The option -enable-stdcall-fixup needs to be prefixed with a -Wl, in order to get parsed correctly by mingw32-g++ because -e... will be split into -e ... when parsed. This prefix simply means "do not parse the following as -e nable-stdcall-fixup but as -enable-stdcall-fixup".

The qmake.conf file contains -Wl but in a wrong line, hence the merge request, which says

the leading "-Wl," was apparently accidentally split off to the wrong line.

The patch moves the -Wl one line up. You can do this manually on your qmake.conf file, which should be located under the Qt installation under mkspecs/win32-g++/qmake.conf. Change the following lines:

QMAKE_LFLAGS    = -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc
QMAKE_LFLAGS_EXCEPTIONS_ON = -mthreads -Wl

Into this:

QMAKE_LFLAGS    = -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc
QMAKE_LFLAGS_EXCEPTIONS_ON = -mthreads

Note that there should be no space between -Wl, and -enable-stdcall-fixup. It should be passed as one single argument to g++ in order to achieve what we want.