https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82215
Bug ID: 82215
Summary: Feature request to better support two pass compiling
with gfortran
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: busby1 at llnl dot gov
Target Milestone: ---
Created attachment 42174
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42174&action=edit
LLNL-TR-738243, five page technical report, four figures (PDF)
The term *two pass* fortran compiling means that in pass1, module files are
created, and in pass2, object files are generated. I have developed an interim
method to carry out two pass compiles with gfortran. The attached paper shows
how using the two pass approach on a 45,000 SLOC Fortran project speeds up our
compiles by almost a factor of four. This is a huge improvement, as our code
is undergoing heavy development, with many daily compiles.
It would be most useful if the gfortran compiler had options that could
directly support two pass compiles. We can accomplish the goal now by
"abusing" existing options, so it is certainly feasible. Please see footnote
#6 on the last page of the attached document for suggestions about how this
feature request might be satisfied.
Thank you.
