undefined symbols when building on raspberry pi 3b+

[falquaddoomi]

I'd like to use the pulseaudio-integrated version of projectM to display music visualizations for whatever is being played. After checking out d789acb (i.e., master as of today) and following the Pi-specific instructions in BUILDING.md, I ran the following to configure and start compiling the project:

./configure --enable-pulseaudio --enable-sdl --enable-gles && make

Unfortunately, I'm encountering a few undefined symbols. Here's the relevant part of the build log:

make[4]: Entering directory '/home/pi/checkouts/projectm/src/projectM-qt'
depbase=`echo qprojectm_mainwindow.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
g++ -DHAVE_CONFIG_H -I. -I../..  -include ../../config.h -DSYSCONFDIR=\""/usr/local/etc"\" -I../../src/libprojectM -I../../src/libprojectM/Renderer -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -isystem /usr/include/arm-linux-gnueabihf/qt5 -isystem /usr/include/arm-linux-gnueabihf/qt5/QtOpenGL -isystem /usr/include/arm-linux-gnueabihf/qt5/QtWidgets -isystem /usr/include/arm-linux-gnueabihf/qt5/QtGui -isystem /usr/include/arm-linux-gnueabihf/qt5/QtCore -I. -I/usr/lib/arm-linux-gnueabihf/qt5/mkspecs/linux-g++  -fPIC -I./vendor  -g -O2 -pthread -std=c++11 -MT qprojectm_mainwindow.o -MD -MP -MF $depbase.Tpo -c -o qprojectm_mainwindow.o qprojectm_mainwindow.cpp &&\
mv -f $depbase.Tpo $depbase.Po
In file included from qprojectm_mainwindow.cpp:39:
qprojectmwidget.hpp: In member function ‘void QProjectMWidget::setup_opengl(int, int)’:
qprojectmwidget.hpp:280:19: error: ‘GL_SMOOTH’ was not declared in this scope
    glShadeModel ( GL_SMOOTH );
                   ^~~~~~~~~
qprojectmwidget.hpp:280:19: note: suggested alternative: ‘GL_SHORT’
    glShadeModel ( GL_SMOOTH );
                   ^~~~~~~~~
                   GL_SHORT
qprojectmwidget.hpp:280:4: error: ‘glShadeModel’ was not declared in this scope
    glShadeModel ( GL_SMOOTH );
    ^~~~~~~~~~~~
qprojectmwidget.hpp:280:4: note: suggested alternative: ‘QTreeModel’
    glShadeModel ( GL_SMOOTH );
    ^~~~~~~~~~~~
    QTreeModel
qprojectmwidget.hpp:293:4: error: ‘glMatrixMode’ was not declared in this scope
    glMatrixMode ( GL_TEXTURE );
    ^~~~~~~~~~~~
qprojectmwidget.hpp:293:4: note: suggested alternative: ‘QMatrix4x3’
    glMatrixMode ( GL_TEXTURE );
    ^~~~~~~~~~~~
    QMatrix4x3
qprojectmwidget.hpp:294:4: error: ‘glLoadIdentity’ was not declared in this scope
    glLoadIdentity();
    ^~~~~~~~~~~~~~
qprojectmwidget.hpp:297:19: error: ‘GL_PROJECTION’ was not declared in this scope
    glMatrixMode ( GL_PROJECTION );
                   ^~~~~~~~~~~~~
qprojectmwidget.hpp:297:19: note: suggested alternative: ‘GL_LOCATION’
    glMatrixMode ( GL_PROJECTION );
                   ^~~~~~~~~~~~~
                   GL_LOCATION
qprojectmwidget.hpp:301:19: error: ‘GL_MODELVIEW’ was not declared in this scope
    glMatrixMode ( GL_MODELVIEW );
                   ^~~~~~~~~~~~
qprojectmwidget.hpp:301:19: note: suggested alternative: ‘GL_NEVER’
    glMatrixMode ( GL_MODELVIEW );
                   ^~~~~~~~~~~~
                   GL_NEVER
qprojectmwidget.hpp:304:4: error: ‘glDrawBuffer’ was not declared in this scope
    glDrawBuffer ( GL_BACK );
    ^~~~~~~~~~~~
qprojectmwidget.hpp:304:4: note: suggested alternative: ‘glDrawBuffers’
    glDrawBuffer ( GL_BACK );
    ^~~~~~~~~~~~
    glDrawBuffers
qprojectmwidget.hpp:310:15: error: ‘GL_LINE_SMOOTH’ was not declared in this scope
    glEnable ( GL_LINE_SMOOTH );
               ^~~~~~~~~~~~~~
qprojectmwidget.hpp:310:15: note: suggested alternative: ‘GL_LINE_LOOP’
    glEnable ( GL_LINE_SMOOTH );
               ^~~~~~~~~~~~~~
               GL_LINE_LOOP
qprojectmwidget.hpp:311:15: error: ‘GL_POINT_SMOOTH’ was not declared in this scope
    glEnable ( GL_POINT_SMOOTH );
               ^~~~~~~~~~~~~~~
qprojectmwidget.hpp:311:15: note: suggested alternative: ‘GL_POINTS’
    glEnable ( GL_POINT_SMOOTH );
               ^~~~~~~~~~~~~~~
               GL_POINTS
qprojectmwidget.hpp:317:4: error: ‘glLineStipple’ was not declared in this scope
    glLineStipple ( 2, 0xAAAA );
    ^~~~~~~~~~~~~
qprojectmwidget.hpp:317:4: note: suggested alternative: ‘glBindSampler’
    glLineStipple ( 2, 0xAAAA );
    ^~~~~~~~~~~~~
    glBindSampler
qprojectm_mainwindow.cpp: In member function ‘void QProjectM_MainWindow::updateFilteredPlaylist(const QString&)’:
qprojectm_mainwindow.cpp:1258:45: warning: comparison of integer expressions of different signedness: ‘const long int’ and ‘const unsigned int’ [-Wsign-compare]
    if (activePresetId.hasValue() && data.id == activePresetId.value()) {
                                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
qprojectm_mainwindow.cpp:1277:46: warning: comparison of integer expressions of different signedness: ‘const long int’ and ‘const unsigned int’ [-Wsign-compare]
     if (activePresetId.hasValue() && data.id == activePresetId.value()) {
                                      ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
make[4]: *** [Makefile:528: qprojectm_mainwindow.o] Error 1
make[4]: Leaving directory '/home/pi/checkouts/projectm/src/projectM-qt'
make[3]: *** [Makefile:454: all] Error 2
make[3]: Leaving directory '/home/pi/checkouts/projectm/src/projectM-qt'
make[2]: *** [Makefile:458: all-recursive] Error 1
make[2]: Leaving directory '/home/pi/checkouts/projectm/src'
make[1]: *** [Makefile:526: all-recursive] Error 1
make[1]: Leaving directory '/home/pi/checkouts/projectm'
make: *** [Makefile:416: all] Error 2

I'm using Raspbian 10 (buster). Here's the output of uname -a: Linux raspberrypi 5.4.83-v7+ #1379 SMP Mon Dec 14 13:08:57 GMT 2020 armv7l GNU/Linux. Thanks for your time!

[falquaddoomi]

Ok, I feel a bit foolish...after posting this, I read #356, which suggests adding #include <GL/gl.h> to src/projectM-qt/qprojectmwidget.hpp, which fixes the issue. Hopefully other people who have the same issue will find this and be able to apply the same fix.

[scorgn]

Same issue, this saved me a ton of time! Thank you!