Compile libraw on windows 7

samdol

Hi,

Since Qt does not support raw image file, I downloaded LibRaw-0.17.2.zip and
tried to compile on Windows 7. I installed mingw32 which comes with Qt5.6.2
and installed MSYS.
As instruction said, I did
sh ./configure
make
when I compile by 'make', I got the following error message.

src/libraw_c_api.cpp: In function 'int libraw_get_color_maximum(libraw_data_t*)':
src/libraw_c_api.cpp:333:12: warning: 'int libraw_get_color_maximum(libraw_data_t*)' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
make: *** [src/libraw_c_api.lo] Error 1

I just see warnings, but it spew error at the end.
Does anyone who compiled libraw on Windows encountered the similar problem?

samdol

@samdol

Inside LibRaw-0.17.2 directory, I found a script called "Makefile.mingw" Using
this file I excuted
mingw32-make -f makefile.mingw
And I could got libraw.a under lib directory.
Now I intend to use libraw.a to make qtraw plugin.
I downloaded qtraw-master.zip from github
https://github.com/mardy/qtraw
and extract it and move to the
directory. I created "libraw" directory inside and put header files(libraw.h,
libraw_const.h...) and put libraw.a to "libraw/win32" directory.

But when I try to build the libraw plugin, I got the message
Project ERROR: libraw development package not found
It seems
PKGCONFIG += libraw
in .pro file cause this problem.
So if I remove that line and build again, I got another error message
undefined reference to '_imp__ZTV26LibRaw_abstract_datastream'
I have no idea what to do next.
The following is my .pro file
include(../common-config.pri)

TARGET = qtraw
TEMPLATE = lib
CONFIG +=
link_pkgconfig
plugin
DESTDIR = imageformats

PKGCONFIG +=
libraw

HEADERS +=
datastream.h
raw-io-handler.h
SOURCES +=
datastream.cpp
main.cpp
raw-io-handler.cpp
OTHER_FILES +=
raw.json

target.path += $$[QT_INSTALL_PLUGINS]/imageformats
INSTALLS += target

kde_desktop.files = raw.desktop
kde_desktop.path = $${INSTALL_KDEDIR}/share/kde4/services/qimageioplugins/
INSTALLS += kde_desktop

unix:!macx:!symbian: LIBS += $$PWD/libraw/linux/libraw.a
else:macx: LIBS += $$PWD/libraw/macx/libraw.a
else:win32: LIBS += $$PWD/libraw/win32/libraw.a
QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.6

SGaist

Hi,

You need to pass the include dir as well as library dir when you are compiling the plugin inside the sources.

samdol

@SGaist
It seems the line
PKGCONFIG +=
libraw
in src.pro causes the problem. I don't know exactly what PKGCONFIG means but
after googling it seems setting system library. So I commented out those two lines and compiled again, then I got another error message,

release/datastream.o:datastream.cpp:(.text+0x1): undefined reference to _imp___ZTV26LibRaw_abstract_datastream' release/datastream.o:datastream.cpp:(.text+0x117): undefined reference to _imp___ZTV26LibRaw_abstract_datastream'
c:/Qt/Qt5.6.2/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: release/datastream.o: bad reloc address 0x0 in section `.rdata$_ZTI26LibRaw_abstract_datastream[__ZTI26LibRaw_abstract_datastream]'
collect2.exe: error: ld returned 1 exit status
Makefile.Release:68: recipe for target 'imageformats/qtraw.dll' failed
mingw32-make[2]: Leaving directory 'd:/qqes/qtraw-master/build-qtraw-Desktop_Qt_5_6_2_MinGW_32bit-Release/src'
Makefile:34: recipe for target 'release' failed
mingw32-make[1]: Leaving directory 'd:/qqes/qtraw-master/build-qtraw-Desktop_Qt_5_6_2_MinGW_32bit-Release/src'
mingw32-make[2]: *** [imageformats/qtraw.dll] Error 1
mingw32-make[1]: *** [release] Error 2
makefile:39: recipe for target 'sub-src-make_first' failed
mingw32-make: *** [sub-src-make_first] Error 2

I don't know what to do with this.

SGaist

It's for the pkg-config tool that is not standard on Windows but that you can install.

Hence you need to add to LIBS the path and library to link to for libraw.

samdol

@SGaist

I think I added the path and library to LIBS as
else:win32: LIBS += $$PWD/libraw/win32/libraw.a

SGaist

LIBS += -L$$PWD/libraw/win32/ -lraw

samdol

@SGaist
The contents of libraw.pc.in is

prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@

Name: libraw
Description: Raw image decoder library (non-thread-safe)
Requires: @PACKAGE_REQUIRES@
Version: @PACKAGE_VERSION@
Libs: -L${libdir} -lraw -lstdc++@PC_OPENMP@
Cflags: -I${includedir}/libraw

so I set
INCLUDEPATH += $$PWD/libraw
LIBS += -L$$PWD/libraw/win32/ -lraw -lstdc++
but that gives me the same error.

SGaist

Which version of MinGW did you use to build libraw ?

samdol

@SGaist
I used mingw 4.9.2.

SGaist

The one provided with Qt ?

samdol

This post is deleted!

samdol

@SGaist
Yes, It came with 5.6.2

SGaist

Can you check against the latest version of LibRaw ?

There might be a problem with their handling of the imported/exported symbol.