Q: |
On Linux, I get a segmentation fault as soon as I run one of the official
examples.
|
A: |
Check that the CLHEP library has been installed and compiled coherently
with the same compiler you use for installing Geant4 and for the same
version of Linux distribution. For example, a binary object produced with
Red-Hat 7.X is not fully compatible with binaries running on RH 9.X or
higher, due to different libc used in the two configurations.
|
Q: |
I installed Geant4 libraries and built my application, when I try to run
it I get:
|
A: |
Your installation of CLHEP includes shared libraries. You need to specify
the path where libCLHEP.so is installed through your environment variable
LD_LIBRARY_PATH. For example, in tcsh UNIX shell:
|
Q: |
On my system I get a Floating Point Exception (FPE) since some physics
processes sometimes return DBL_MAX as interaction
length and this number is afterwards multiplied by a number greater
than 1.
|
A: |
Geant4 coding conventions and installation setup explicitly follow the
ANSI/IEEE-754 Standard for the initialization of floating-point
arithmetic hardware and portability. The Standard foresees floating-point
arithmetic to be nonstop and underflows to be gradual. On DEC platforms,
for example, the ANSI/IEEE-754 Standard compliance needs to be explicitly
set (since deactivated by default); in this case we use infact the option
"-ieee" on the DEC/cxx native C++ compiler to achieve this. You should
check if your compiler provides compilation options for activating Standard
initialization of FP arithmetic (it may be platform specific).
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