Test AC_FC_LINE_LENGTH only to 250 columns

* NEWS, doc/autoconf.texi, lib/autoconf/fortran.m4:
Document 250, not 254.
* tests/fortran.at (AC_FC_LINE_LENGTH): Test lines with 250
columns not 253, since Oracle Studio 12.6 Fortran 95 8.8
2017/05/30 goes up only to 250.

diff --git a/NEWS b/NEWS
index 438f074b751cd2bab202f24f0a00daace3692fbb..000570e0f65e783a7cffd5b4759c2407cd6864c9 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -191,6 +191,9 @@ GNU Autoconf NEWS - User visible changes.
   diagnosed as obsolete, and replaced with AC_CONFIG_HEADERS by
   autoupdate.
 
+- AC_FC_LINE_LENGTH now documents the maximum portable length of
+  "unlimited" Fortran source code lines to be 250 columns, not 254.
+
 * Noteworthy changes in release 2.69 (2012-04-24) [stable]
 
 ** Autoconf now requires perl 5.6 or better (but generated configure

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index f178b385906e6f04231e885001816344ee04890b..8497f46fe4f817dc079c98e1672b3c115ed2f71a 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -8341,7 +8341,7 @@ the @code{ac_cv_fc_fixedform} variable.
 
 Try to ensure that the Fortran compiler (@code{$FC}) accepts long source
 code lines.  The @var{length} argument may be given as 80, 132, or
-unlimited, and defaults to 132.  Note that line lengths above 254
+unlimited, and defaults to 132.  Note that line lengths above 250
 columns are not portable, and some compilers do not accept more than 132
 columns at least for fixed format source.  If necessary, it may add some
 additional flags to @code{FCFLAGS}.

diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index 5654f60efa204bbfa11dd2f6db4c1e2a0c784539..0a0c41684c170c698c01209c5a3e9f121e792922 100644 (file)
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1455,7 +1455,7 @@ AC_LANG_POP([Fortran])dnl
 # Look for a compiler flag to make the Fortran (FC) compiler accept long lines
 # in the current (free- or fixed-format) source code, and adds it to FCFLAGS.
 # The optional LENGTH may be 80, 132 (default), or `unlimited' for longer
-# lines.  Note that line lengths above 254 columns are not portable, and some
+# lines.  Note that line lengths above 250 columns are not portable, and some
 # compilers (hello ifort) do not accept more than 132 columns at least for
 # fixed format.  Call ACTION-IF-SUCCESS (defaults to nothing) if successful
 # (i.e. can compile code using new extension) and ACTION-IF-FAILURE (defaults

diff --git a/tests/fortran.at b/tests/fortran.at
index 46ffadd801b923cb8dd66480d0e83a89936153b4..241d9b0d32b69ce31000e2a00d8b79885b608953 100644 (file)
--- a/tests/fortran.at
+++ b/tests/fortran.at
@@ -1012,20 +1012,25 @@ clean:
        rm -f *.@OBJEXT@ prog@EEXEXT@
 ]])
 
+# When preceded by 7 spaces and followed by newline, line_80 generates
+# a line of exactly 79 columns, line_132 generates a line of exactly 131
+# coluns, and line_250 generates a line of exactly 250 columns.
+# FIXME: Shouldn't line_80 and line_132 generate lines that are one column
+# longer, so that their contents match the variable names?
 line_80=\
 'subroutine foo(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11)'
 line_132=\
 'subroutine foo(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11,'\
 'arg12,arg13,arg14,arg15,arg16,arg17,arg18,arg19)'
-line_254=\
-'subroutine foo(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11,'\
+line_250=\
+'subroutine foofoo(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11,'\
 'arg12,arg13,arg14,arg15,arg16,arg17,arg18,arg19,arg20,arg21,arg22,arg23,'\
 'arg24,arg25,arg26,arg27,arg28,arg29,arg30,arg31,arg32,arg33,arg34,arg35,'\
-'arg36,arg37,arg38,arg39,arg40)'
+'arg36,arg37,arg38,arg39)'
 
-for len in 80 132 254
+for len in 80 132 250
 do
-  if test $len -eq 254; then arg=unlimited; else arg=$len; fi
+  if test $len -eq 250; then arg=unlimited; else arg=$len; fi
   eval long_line=\$line_$len
 
   # Try free-form first, it has a bigger chance of succeeding.