You may have heard there is a problem building FGRUN on Ubuntu 13.04 but
not on Ubuntu 12.10. I've attached a patch to fgrun/CMakeLists.txt. I
consider it a workaround. It's been tested on 13.04 and 12.10
The symptom:
The build on Ubuntu 13.04 fails with the message:
-- Performing Test HAVE_FLTK_1_3 - Failed
CMake Error at CMakeLists.txt:228 (message):
FLTK 1.3 is required
The message appears on a freshly installed and updated
installation of 13.04, after adding the additional packages
needed to build flightgear.
There is no earlier version of FLTK installed. Other than
install the tools needed to build flightgear, nothing unusual
has been done to the libraries.
The problem:
The failure happens when CMake tries to check that a compile
and link using fltk 1.3 succeeds. The compile and link
fails
This is the failing section of code from fgrun/CMakeLists.txt
at the indicated point, line 228.
check_cxx_source_runs(
"#include <FL/Fl.H>
int main() {
return Fl::version() >= 1.03 ? 0 : -1;
}
"
HAVE_FLTK_1_3)
if ( NOT HAVE_FLTK_1_3 )
message( SEND_ERROR "FLTK 1.3 is required" )
endif ( NOT HAVE_FLTK_1_3 )
Analysis:
The compile of the code in the above CMakeLists.txt code is
failing, presumably because it does not have -ldl in the path.
Commenting out this section of the CMakeLists.txt allows the
build for FGRUN to proceed. However with only this change,
the actual build fails during the link phase of FGRUN for the
same reason. Running the cmake and make in verbose mode
gives the actual error and illustrates the problem.
you get undefined reference to symbol dlopen@@GLIBC_2.1
this is in libdl.so
Possible Causes:
1. Sometething is amis with fltk and cmake. Has a library has
moved out of reach of the Find_FLTK.cmake.
2. Installing something broke it on Ubuntu 13.10.
Workaround:
Our CMakeLists.txt for FGRUN builds the variable
FLTK_LIBRARIES. I added "libdl.so" to this variable
before adding two additional libraries needed for fltk. This
fixes the build, but not the test for fltk version 1.3 in the
cmake. Commenting out this test seems an acceptable
workaround and the build works.
Testing:
I have tested the patch on Ubuntu 13.04 and Ubuntu 12.10. As
long as FLTK 1.3 is installed everything should work.
# get rid of previous build and install for fgrun
rm -rf build/fgrun install/fgrun
# get fresh copy of CMakelists.txt
./download_and_compile.sh -d y -p n fgrun
patch fgrun/CmakeLists.txt <00000001.patch-fgrun-CMakeLists.txt
# build without downloading a fresh CMakeLists.txt -note -d n
./download_and_compile.sh -d n -p n fgrun
Next Steps:
If acceptable, Commit the patched fgrun/CMakeLists.txt
It would be good if someone can come up with a better patch,
one that allows the check_cxx_source_runs to do its test.
If anyone has a good explanation of what is really going on
with fltk and change between the two versions, I'd like to see
it. We are not the only application with this issue.
ask the fltk maintainers about this
_pat
--- CMakeLists.txt.old 2013-05-23 22:26:42.532784855 -0400
+++ CMakeLists.txt 2013-05-23 22:01:45.988781967 -0400
@@ -202,6 +202,7 @@
endif ( NOT ( HAVE_OPENPTY OR HAVE__GETPTY ) )
if ( FLTK_FOUND )
+ list(APPEND FLTK_LIBRARIES "libdl.so")
if ( X11_Xinerama_FOUND )
message(STATUS "Found X11_Xinerama...")
list(APPEND FLTK_LIBRARIES ${X11_Xinerama_LIB})
@@ -216,17 +217,17 @@
set( CMAKE_REQUIRED_LIBRARIES ${FLTK_LIBRARIES} )
message(STATUS "Using FLTK_LIBRARIES for fgrun: ${FLTK_LIBRARIES}")
- check_cxx_source_runs(
- "#include <FL/Fl.H>
- int main() {
- return Fl::version() >= 1.03 ? 0 : -1;
- }
- "
- HAVE_FLTK_1_3)
-
- if ( NOT HAVE_FLTK_1_3 )
- message( SEND_ERROR "FLTK 1.3 is required" )
- endif ( NOT HAVE_FLTK_1_3 )
+# check_cxx_source_runs(
+# "#include <FL/Fl.H>
+# int main() {
+# return Fl::version() >= 1.03 ? 0 : -1;
+# }
+# "
+# HAVE_FLTK_1_3)
+#
+# if ( NOT HAVE_FLTK_1_3 )
+# message( SEND_ERROR "FLTK 1.3 is required" )
+# endif ( NOT HAVE_FLTK_1_3 )
endif ( FLTK_FOUND )
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