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Diffstat (limited to 'doc/autoconf.texi')
| -rw-r--r-- | doc/autoconf.texi | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/autoconf.texi b/doc/autoconf.texi index acc290b0..2422bd67 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -7234,6 +7234,24 @@ latter. This macro caches its result in the @code{ac_cv_prog_c_openmp}, @code{ac_cv_prog_cxx_openmp}, @code{ac_cv_prog_f77_openmp}, or @code{ac_cv_prog_fc_openmp} variable, depending on the current language. + +@strong{Caution:} Some of the compiler options that @code{AC_OPENMP} +tests, mean ``enable OpenMP'' to one compiler, but ``write output to a +file named @file{mp} or @file{penmp}'' to other compilers. We cannot +guarantee that the implementation of @code{AC_OPENMP} will not overwrite +an existing file with either of these names. + +Therefore, as a defensive measure, a @command{configure} script that +uses @code{AC_OPENMP} will issue an error and stop (before doing any of +the operations that might overwrite these files) upon encountering +either of these files in its working directory. +@command{autoconf} will also issue an error if it finds either of +these files in the same directory as a @file{configure.ac} that +uses @code{AC_OPENMP}. + +If you have files with either of these names at the top level of your +source tree, and you need to use @code{AC_OPENMP}, we recommend you +either change their names or move them into a subdirectory. @end defmac @node C Compiler |