Linkage error when building wxwidgets application

I am trying to compile wx helloworld ( http://docs.wxwidgets.org/stable/overview_helloworld.html )
but I've got an error when linking

clang -I/usr/include/wx-3.0 `wx-config-gtk3 --cxxflags --libs` `wx-config-gtk3 --libs` -o w
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)


my guess is that I am missing some -l parameter but don't know which.
Here are possible libraries:

pacman -Ql wxgtk3
wxgtk3 /usr/
wxgtk3 /usr/bin/
wxgtk3 /usr/bin/wx-config-gtk3
wxgtk3 /usr/lib/
wxgtk3 /usr/lib/libwx_gtk3u_adv-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_adv-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_adv-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_aui-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_aui-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_aui-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_core-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_core-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_core-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_gl-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_gl-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_gl-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_html-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_html-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_html-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_media-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_media-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_media-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_propgrid-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_propgrid-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_propgrid-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_qa-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_qa-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_qa-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_ribbon-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_ribbon-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_ribbon-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_richtext-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_richtext-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_richtext-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_stc-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_stc-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_stc-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_webview-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_webview-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_webview-3.0.so.0.4.0
wxgtk3 /usr/lib/libwx_gtk3u_xrc-3.0.so
wxgtk3 /usr/lib/libwx_gtk3u_xrc-3.0.so.0
wxgtk3 /usr/lib/libwx_gtk3u_xrc-3.0.so.0.4.0
wxgtk3 /usr/lib/wx/
wxgtk3 /usr/lib/wx/3.0/
wxgtk3 /usr/lib/wx/3.0/web-extensions/
wxgtk3 /usr/lib/wx/3.0/web-extensions/webkit2_extu-3.0.so
wxgtk3 /usr/lib/wx/config/
wxgtk3 /usr/lib/wx/config/gtk3-unicode-3.0
wxgtk3 /usr/lib/wx/include/
wxgtk3 /usr/lib/wx/include/gtk3-unicode-3.0/
wxgtk3 /usr/lib/wx/include/gtk3-unicode-3.0/wx/
wxgtk3 /usr/lib/wx/include/gtk3-unicode-3.0/wx/setup.h
wxgtk3 /usr/share/
wxgtk3 /usr/share/licenses/
wxgtk3 /usr/share/licenses/wxgtk3/


Thank you for your help and excuse my bad English.

1 Answer
1

Your command line doesn't have your "hello world" source or object file, i.e. you're actually not compiling/linking anything. I don't know what are you trying to do, but if your program consists of a single hello.cpp file, the correct way to build it is

hello.cpp

clang -o hello hello.cpp `wx-config-gtk3 --cxxflags --libs`


i.e. the input file must be specified on the command line, but you don't need the -I option and you also don't need to use wx-config twice (I'd also add -Wall, but this is a separate issue).

-I

wx-config

-Wall

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