When using the lahey fortran compiler the flag -M is used as the path to
modules, but its also the path to where new modules should be written.
So if you are referencing modules in a read-only directory using the -M flag
will cause your program to fail. I think that the solution is to
test for -I first (that's also the most common result, so it would make
sense to test first I think)
--- fortran.m4 (revision 327)
+++ fortran.m4 (working copy)
@@ -618,7 +618,7 @@
[cd ..
ac_fc_module_flag_FCFLAGS_save=$FCFLAGS
# Flag ordering is significant for gfortran and Sun.
- for ac_flag in -M -I '-I ' '-M ' -p '-mod ' '-module ' '-Am -I'; do
+ for ac_flag in -I '-mod ' -I '-I ' '-M ' -p '-module ' '-Am -I'; do
# Add the flag twice to prevent matching an output flag.
FCFLAGS="$ac_fc_module_flag_FCFLAGS_save ${ac_flag}conftest.dir
${ac_flag}conftest.dir"
AC_COMPILE_IFELSE([[
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