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| -rw-r--r-- | doc/FAQ | 40 |
1 files changed, 38 insertions, 2 deletions
@@ -1,7 +1,7 @@ Cactus Code Frequently Asked Questions -$Header: /mnt/data2/cvs2svn/cvs-repositories/Cactus/doc/FAQ,v 1.54 2003-02-01 00:06:50 allen Exp $ +$Header: /mnt/data2/cvs2svn/cvs-repositories/Cactus/doc/FAQ,v 1.55 2003-02-06 07:05:06 allen Exp $ Also available at http://www.cactuscode.org/Documentation/FAQ @@ -210,6 +210,11 @@ E11 The functions CCTK_Exit and CCTK_Abort require cctkGH as an argument. How can I call these functions deep inside my thorns where this pointer is not available? +E12 I'm getting wierd syntax errors in Fortran code, with an extra + garbage character (often $ or &) stuck in the middle of a CCTK_INFO() + or CCTK_WARN() or CCTK_EQUALS() call after it has been processed. + + ------------------------------------------------------------------------------ General @@ -238,7 +243,6 @@ F7 Why don't you use compilers mpicc, mpiCC etc when they exist on parallel F8 How does Cactus manage to so seamlessly call Fortran routines from C, and vice versa? - ------------------------------------------------------------------------------ Documentation: @@ -1101,6 +1105,38 @@ E11 The functions CCTK_Exit and CCTK_Abort require cctkGH as an argument. you need to include a mechanism to obtain the cctkGH deep inside your thorns code. +E12 I'm getting wierd syntax errors in Fortran code, with an extra + garbage character (often $ or &) stuck in the middle of a CCTK_INFO() + or CCTK_WARN() or CCTK_EQUALS() call after it has been processed. + + You have probably used Fortran (either 77 or 90) line continuation + in a macro call + + c example of broken Fortran code fragment + if (CCTK_EQUALS(test,"on")) then + test_state = 1 + else if (CCTK_EQUALS(test, + $ "off")) then + test_state = 3 + end if + + The $ is in column 6 is the Fortran 77 standard way of doing + a line continuation. This doesn't work, because CCTK_EQUALS() + is a macro, and macros use C lexical conventions (regardless of + what language your code is written in). To continue a line in a + macro, use the same technique you would in C, i.e. put a backslash + ( \ ) at the end of the line to be continued (note there must *not* + be any whitespace after the \ !!). For example, the above code + should be written + + c example of valid Fortran code fragment + if (CCTK_EQUALS(test,"on")) then + test_state = 1 + else if (CCTK_EQUALS(test, \ + "off")) then + test_state = 0 + end if + ------------------------------------------------------------------------------ General |