Ian Hinder:

 Cactus supports a variable OPTIMISE=yes/no to control whether optimisation is performed during compilation. Setting this variable to "yes" (for example, make sim-config OPTIMISE=yes) adds the flags in C_OPTIMISE_FLAGS to CFLAGS so that optimisation is performed. This is the default. Setting OPTIMISE=no does not add the flags. For gcc, this results in an unoptimised configuration as gcc assumes -O0 as the default. The Intel compiler, however, uses -O2 as the default. Hence, setting OPTIMISE=no has no effect on Intel, and -O2 is still used.

 This patch adds new configuration options C_NO_OPTIMISE_FLAGS, CXX_NO_OPTIMISE_FLAGS, F77_NO_OPTIMISE_FLAGS and F90_NO_OPTIMISE_FLAGS to complement the *_OPTIMISE_FLAGS options. These are added to the flags when OPTIMISE=no is used, and they default to -O0, which for the commonly used gcc and Intel compilers will lead to an unoptimised configuration.

This commit adds the corresponding documentation to the UsersGuide.



git-svn-id: http://svn.cactuscode.org/flesh/trunk@4682 17b73243-c579-4c4c-a9d2-2d5706c11dac

1 files changed, 10 insertions, 0 deletions

diff --git a/doc/UsersGuide/Notes.tex b/doc/UsersGuide/Notes.tex
index b5bb9924..8085eb32 100644
--- a/doc/UsersGuide/Notes.tex
+++ b/doc/UsersGuide/Notes.tex
@@ -392,6 +392,16 @@ type of optimisation being used.
 Optimisation flags for the Fortran 77 compiler, their use depends on the
 type of optimisation being used.
 
+\item [\texttt{C\_NO_OPTIMISE\_FLAGS}]
+
+\item [\texttt{CXX\_NO\_OPTIMISE\_FLAGS}]
+
+\item [\texttt{F90\_NO\_OPTIMISE\_FLAGS}]
+
+\item [\texttt{F77\_NO\_OPTIMISE\_FLAGS}]
+Optimisation flags used to indicate that no optimisation should be
+performed.  These are invoked when OPTIMISE=no is used.
+
 \item [\texttt{PROFILE}]
   * Specifies what type of profiling should be used.  The only options
   currently available are \texttt{yes} and \texttt{no}.  The default