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Bug#: 26564
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Status: RESOLVED
Resolution: INVALID
Assigned To: Not yet assigned to anyone <unassigned@gcc.gnu.org>
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Reporter: Will L Givens <diskman@kc.rr.com>
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Description:   Last confirmed: Opened: 2006-03-04 20:33
Was attempting the build GCC-4.1.0 but recieved the error below. 
Kernel-2.6.13.4
GCC-4.0.1 [I know, it rolls over to its own compiler - xgcc]
Binutils-2.16.90.0.3
Make-3.80

CC="ccache gcc" CXX="ccache g++" CPP="ccache cpp" \
 CFLAGS="-O3 -fstrict-aliasing -finline -mieee -fomit-frame-pointer \
 -mtune=ev56 -w -pipe" \
 CXXFLAGS="-O3 -fstrict-aliasing -finline -mieee -fomit-frame-pointer \
 -mtune=ev56 -w -pipe" \
 ./configure \
 --host=alphapca56-alpha-linux-gnu \
 --build=alphapca56-alpha-linux-gnu \
 --sysconfdir=/etc \
 --prefix=/usr \
 --localstatedir=/var \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --x-includes=/usr/X11R6/include \
 --x-libraries=/usr/X11R6/lib \
 --enable-libada

make[2]: Entering directory
`/usr2/www/pub/alpha-RH7/programming/compilers/gcc-4.1.0/gcc-4.1.0/alphapca56-alpha-linux-gnu/libgfortran'
/bin/sh ../.././libgfortran/mk-kinds-h.sh
'/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem
/usr/alphapca56-alpha-linux-gnu/sys-include -I . -Wall -fno-repack-arrays
-fno-underscoring ' > kinds.h || rm kinds.h
../.././libgfortran/mk-kinds-h.sh: Unknown type
grep '^#' < kinds.h > kinds.inc
/bin/sh: kinds.h: No such file or directory
make[2]: *** [kinds.inc] Error 1
make[2]: Leaving directory
`/usr2/www/pub/alpha-RH7/programming/compilers/gcc-4.1.0/gcc-4.1.0/alphapca56-alpha-linux-gnu/libgfortran'
make[1]: *** [all-target-libgfortran] Error 2
make[1]: Leaving directory
`/usr2/www/pub/alpha-RH7/programming/compilers/gcc-4.1.0/gcc-4.1.0'
make: *** [all] Error 2

------- Comment #1 From Andrew Pinski 2006-03-04 20:38 -------
This does not makes sense really unless you /bin/sh is broken.
Can you try runing /bin/sh $(srcdir)/libgfortran/mk-kinds-h.sh

With replacing "$(srcdir)" with the source directory path?

------- Comment #2 From Andrew Pinski 2006-03-04 20:47 -------
Actually I take this back.  This can happen though it should not happen at all
unless your /bin/sh is going bonkers.
possible_real_kinds="4 8 10 16"
for k in $possible_real_kinds; do
    case $k in
      4) ctype="float" ;;
      8) ctype="double" ;;
      10) ctype="long double" ;;
      16) ctype="long double" ;;
      *) echo "$0: Unknown type" >&2 ; exit 1 ;;
    esac
    largest_ctype="$ctype" 
...
case $largest_ctype in
  float) echo "#define GFC_REAL_LARGEST_FORMAT \"\"" ;;
  double) echo "#define GFC_REAL_LARGEST_FORMAT \"l\"" ;;
  "long double") echo "#define GFC_REAL_LARGEST_FORMAT \"L\"" ;;
  *) echo "$0: Unknown type" >&2 ; exit 1 ;;
esac

------- Comment #3 From Andreas Schwab 2006-03-04 21:07 -------
It can happen when the fortran compiler is broken.  What do you get when you
execute this command (all in one line)?

echo "  real (kind=4) :: x" > tmp.f90; echo "  end" >> tmp.f90;
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem
/usr/alphapca56-alpha-linux-gnu/sys-include -I . -Wall -fno-repack-arrays
-fno-underscoring -c tmp.f90

------- Comment #4 From Will L Givens 2006-03-05 00:48 -------
I tried : sh ./libgfortran/mk-kinds-h.sh
#define GFC_INTEGER_LARGEST GFC_INTEGER_
#define GFC_UINTEGER_LARGEST GFC_UINTEGER_

./libgfortran/mk-kinds-h.sh: Unknown type
[root@jericho gcc-4.1.0]# 

When I run the following command:
echo "  real (kind=4) :: x" > tmp.f90; echo "  end" >> tmp.f90;
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem
/usr/alphapca56-alpha-linux-gnu/sys-include -I . -Wall -fno-repack-arrays
-fno-underscoring -c tmp.f90

cmp.c:39: GNU MP assertion failed: !(((b)->_mpfr_size >> 30) & 1)
<built-in>:0: internal compiler error: Aborted
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

I have gmp-4.1.4 installed [installed it before I attempted to compile
GCC-4.1.0]

------- Comment #5 From kargl@gcc.gnu.org 2006-03-05 01:39 -------
> cmp.c:39: GNU MP assertion failed: !(((b)->_mpfr_size >> 30) & 1)
> <built-in>:0: internal compiler error: Aborted
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.

This isn't a gfortran problem.  How did you install GMP and MPFR?
Note, you may want to install GMP without its bundled in version
of MPFR; then install the newest version of MPFR.  Also, try building
GMP without high levels of optimization.

------- Comment #6 From Will L Givens 2006-03-05 02:20 -------
Subject: RE:  ../.././libgfortran/mk-kinds-h.sh: Unknown type

Alright, I'll try that... rebuilding GMP with base/low level CFLAGS and see
how it goes... Will L G

-----Original Message-----
From: kargl at gcc dot gnu dot org [mailto:gcc-bugzilla@gcc.gnu.org] 
Sent: Saturday, March 04, 2006 7:40 PM
To: diskman@kc.rr.com
Subject: [Bug libfortran/26564] ../.././libgfortran/mk-kinds-h.sh: Unknown
type



------- Comment #5 from kargl at gcc dot gnu dot org  2006-03-05 01:39
-------
> cmp.c:39: GNU MP assertion failed: !(((b)->_mpfr_size >> 30) & 1)
> <built-in>:0: internal compiler error: Aborted
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.

This isn't a gfortran problem.  How did you install GMP and MPFR?
Note, you may want to install GMP without its bundled in version
of MPFR; then install the newest version of MPFR.  Also, try building
GMP without high levels of optimization.


-- 

kargl at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu dot
org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26564

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You reported the bug, or are watching the reporter.

------- Comment #7 From Francois-Xavier Coudert 2006-03-05 10:08 -------
(In reply to comment #6)
> Alright, I'll try that... rebuilding GMP with base/low level CFLAGS and see
> how it goes...

You may want to configure GMP with --host=none --target=none --build=none to
disable platform-specific optimization.

------- Comment #8 From Will L Givens 2006-03-06 03:56 -------
Well I went ahead and reinstalled GMP-4.1.4:

CC=gcc-3.2.3 CXX=g++-3.2.3 CPP=cpp-3.2.3 \
 CFLAGS="-O2 -mieee -mtune=ev56 -w -pipe" \
 CXXFLAGS="-O2 -mieee -mtune=ev56 -w -pipe" \
 ./configure \
 --build=alpha-alpha-linux \
 --prefix=/usr \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --enable-cxx \
 --enable-nails \
 --disable-mpfr

And installed MPFR-2.2.0:

CC="ccache gcc-3.2.3" CXX="ccache g++-3.2.3" CPP="ccache cpp-3.2.3" \
 CFLAGS="-O2 -mieee -mtune=ev56 -w -pipe" \
 CXXFLAGS="-O2 -fomit-frame-pointer -mieee -mtune=ev56 -w -pipe" \
 ./configure \
 --build=alpha-alpha-linux \
 --prefix=/usr \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --enable-shared

and then attempted to rebuild GCC. All the GFORTAN compiler does now, is simply
hang at the following:

checking whether the linker
(/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/collect-ld)
supports shared libraries... yes
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking command to parse
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/nm
output... ok
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
creating libtool
updating cache ./config.cache
configure: loading cache ./config.cache
checking for alphapca56-alpha-linux-gnu-gfortran...
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem
/usr/alphapca56-alpha-linux-gnu/sys-include
checking whether we are using the GNU Fortran compiler... 

I let it sit for several hours and it never budged... I think it is now safe to
say that GFORTRAN isn't working properly and that GMP/MPFR [will not build with
anything greater than GCC-3.2.3] are somewhat dodgey at best.

I've tried several different configurations and variation on the deps builds
and GCC itself, nothing is working as it should.

------- Comment #9 From Will L Givens 2006-03-06 06:51 -------
Did some hunting around on the net, it seems the 'hanging' problem is happen to
others as well. Here's a Solaris user with the same issue:

http://gcc.gnu.org/ml/fortran/2005-05/msg00456.html

------- Comment #10 From Francois-Xavier Coudert 2006-03-06 07:35 -------
Could you try to compile a test program under gdb to see where it freezes?

$ cat > a.f90
  integer :: a = 45
  real(8) :: x = 1.78d2
  print *, "hello", x / a
  end
$ gdb -args
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem a.f90

then interrupt it (^C) and ask "where".

I've been doing builds on (i386|sparc)-solaris and alphaev*-alpha-linux-gnu for
quite some time now. I don't know alphapca56: how different from the other
alphas is it?

------- Comment #11 From Will L Givens 2006-03-06 08:03 -------
The AlphaPC 164SX is basically the same as the AlphaPC 164LX just minus the 96k
L1 cache but with additional MVI instructions.

[root@jericho gcc-4.1.0]# gdb -args
/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem a.f90
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "alphapca56-alpha-linux-gnu"...
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) run
Starting program:
/usr2/www/pub/alpha-RH7/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/gfortran
-B/usr2/www/linux-related/programming/compilers/gcc-4.1.0/gcc-4.1.0/host-alphapca56-alpha-linux-gnu/gcc/
-B/usr/alphapca56-alpha-linux-gnu/bin/ -B/usr/alphapca56-alpha-linux-gnu/lib/
-isystem /usr/alphapca56-alpha-linux-gnu/include -isystem a.f90
Detaching after fork from child process 24853.
/usr/bin/ld: cannot find -lgfortranbegin
collect2: ld returned 1 exit status

Program exited with code 01.

[root@jericho gcc-4.1.0]# find . -name "*.so.*"
./host-alphapca56-alpha-linux-gnu/gcc/libgcc_s.so.1.backup
./host-alphapca56-alpha-linux-gnu/gcc/libgcc_s.so.1
./alphapca56-alpha-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6.0.7
./alphapca56-alpha-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6
./alphapca56-alpha-linux-gnu/libmudflap/.libs/libmudflap.so.0.0.0
./alphapca56-alpha-linux-gnu/libmudflap/.libs/libmudflap.so.0
./alphapca56-alpha-linux-gnu/libmudflap/.libs/libmudflapth.so.0.0.0
./alphapca56-alpha-linux-gnu/libmudflap/.libs/libmudflapth.so.0
./alphapca56-alpha-linux-gnu/libssp/.libs/libssp.so.0.0.0
./alphapca56-alpha-linux-gnu/libssp/.libs/libssp.so.0

------- Comment #12 From Will L Givens 2006-03-07 04:12 -------
Did I scare everyone off? I have a feeling that the GCC-4.x Fortran code may
have never worked on the Alpha... I could be wrong...

------- Comment #13 From Steve Kargl 2006-03-07 04:17 -------
Subject: Re:  ../.././libgfortran/mk-kinds-h.sh: Unknown type

On Tue, Mar 07, 2006 at 04:12:10AM -0000, diskman at kc dot rr dot com wrote:
> 
> Did I scare everyone off? I have a feeling that the GCC-4.x Fortran code may
> have never worked on the Alpha... I could be wrong...
> 

The fortran code works just fine.  It's gmp that is fubar.
Also, note FX has told you that he build gfortran on alpha
for some version of linux.

------- Comment #14 From Francois-Xavier Coudert 2006-03-07 07:16 -------
(In reply to comment #12)
> Did I scare everyone off?

> I have a feeling that the GCC-4.x Fortran code may
> have never worked on the Alpha... I could be wrong...

We have had reports of successful building on alphaev67-unknown-linux-gnu,
alphaev6-unknown-linux-gnu, alpha-dec-osf4.0f.

As I do personnaly have access to:

HP Tru64 UNIX 5.1B      AlphaServer DS15        2 EV68, 1.0GHz
HP Tru64 UNIX 5.1B      AlphaServer ES45        4 EV68, 1 GHz
HP Tru64 UNIX 5.1B      AlphaServer ES47        2 EV7, 1.0 GHz
Debian GNU/Linux 3.1r0  AlphaServer DS20        2 EV6, 500 MHz
FreeBSD 6.0             AlphaStation XP1000     1 EV67, 667 MHz

Is any of those close enough of your own machine (I don't know alphas very
well) so that I could probably reproduce your bug? Or could I build a working
GMP/MPFR on any of those and send it to you for testing?

Also, you did not say how you compiled your gmp "without optimization". Did you
try the --target=none --host=none --build=none trick?

------- Comment #15 From Will L Givens 2006-03-07 15:31 -------
The closest would be the "AlphaServer DS20", mine is the EV56 [PCA56] and the
DS20 is the EV6 [the very next generation].

I did manage to get GCC-4.1.0 Fortran to build, I simple 'reworked' GMP/MPFR...
I built GMP with the following:

CC=gcc-3.2.3 CXX=g++-3.2.3 CPP=cpp-3.2.3 \
 CFLAGS="-O2 -mieee -finline -fomit-frame-pointer -mtune=ev56 -w -pipe" \
 CXXFLAGS="-O2 -mieee -finline -fomit-frame-pointer -mtune=ev56 -w -pipe" \
 ./configure \
 --build=alpha-alpha-linux \
 --prefix=/usr \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --disable-cxx \
 --disable-nails \
 --disable-mpfr

MPFR:

CC="ccache gcc-3.2.3" CXX="ccache g++-3.2.3" CPP="ccache cpp-3.2.3" \
 CFLAGS="-O2 -fno-strict-aliasing -fomit-frame-pointer -mtune=ev56 -w -pipe" \
 CXXFLAGS="-O2 -fomit-frame-pointer -mtune=ev56 -w -pipe" \
 ./configure \
 --build=alpha-alpha-linux \
 --prefix=/usr \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --enable-shared \
 --enable-mpfr

Now Fortran is working as it should. Right now, at the moment, its compiling
the GCJ portion of the build

------- Comment #16 From Will L Givens 2006-03-07 15:38 -------
Oh one other thing, I just wanted to thank everyone for pointing me in the
right direction and taking the time to help me out... To everyone, thank you!

------- Comment #17 From Francois-Xavier Coudert 2006-03-07 15:42 -------
(In reply to comment #15)
> I did manage to get GCC-4.1.0 Fortran to build, I simple 'reworked'
> GMP/MPFR...

OK. I'm closing this PR since it's not a bug in gfortran, but a mis-compilation
in GMP/MPFR.

> I built GMP with the following:
> 
> CC=gcc-3.2.3 CXX=g++-3.2.3 CPP=cpp-3.2.3 \
>  CFLAGS="-O2 -mieee -finline -fomit-frame-pointer -mtune=ev56 -w -pipe" \
>  CXXFLAGS="-O2 -mieee -finline -fomit-frame-pointer -mtune=ev56 -w -pipe" \
>  ./configure \
>  --build=alpha-alpha-linux \
>  --prefix=/usr \
>  --sysconfdir=/etc \
>  --infodir=/usr/info \
>  --mandir=/usr/man \
>  --disable-cxx \
>  --disable-nails \
>  --disable-mpfr
> 
> MPFR:
> 
> CC="ccache gcc-3.2.3" CXX="ccache g++-3.2.3" CPP="ccache cpp-3.2.3" \
>  CFLAGS="-O2 -fno-strict-aliasing -fomit-frame-pointer -mtune=ev56 -w -pipe" \
>  CXXFLAGS="-O2 -fomit-frame-pointer -mtune=ev56 -w -pipe" \
>  ./configure \
>  --build=alpha-alpha-linux \
>  --prefix=/usr \
>  --sysconfdir=/etc \
>  --infodir=/usr/info \
>  --mandir=/usr/man \
>  --enable-shared \
>  --enable-mpfr

Please note that GMP/MFPR are well known for miscompiling. The GMP webpage is
full of warnings that builds with non-default options (and exotic or recent
compilers) are very risky.

As gfortran uses GMP/MPFR only at compile time (it's not used in the generated
code) and for very few tasks, I'd advise not to look for performance but for
safety. CFLAGS="-O2 -mieee -finline -fomit-frame-pointer -mtune=ev56 -w -pipe"
seems very risky to me, given my bad experiences with GMP.

------- Comment #18 From Patrick Welche 2006-05-20 16:24 -------
I have just experienced exactly the same error on a NetBSD-current/i386 system.
There the problem is not gmp et al.'s fault, and I can't see quite enough
detail in the problem on alpha below to see that it isn't the same.

My system uses ELF binaries, and I don't set half the world in LD_LIBRARY_PATH
nor ld.so.conf.

I have libmpfr.so.2.1 and libgmp.so.7.1 in /usr/local/lib.

The error
  /usr/src/local/gcc/libgfortran/mk-kinds-h.sh: Unknown type
happens because gfortran was compiled without -Wl,-R/usr/local/lib, so it
cannot find libmpr.

The top level configure accepts --with-mpfr=/usr/local --with-gmp=/usr/local,
and doesn't spot any problems, as it AC_TRY_LINKs the libraries rather than
AC_TRY_RUN them.

gcc/configure --help  mentions
  GMPLIBS     How to link GMP
but setting that environment variable (or HOST_GMPLIBS) before running the top
level configure doesn't seem to help, as --with-gmp sets gmplibs, which in top
level Makefile.in sets HOST_GMPLIBS, which in turn is what GMPLIBS is set to,
which is what reaches gcc/Makefile.in (AFAICT)

The way I worked around this is after running configure --with-gmp..., edit the
top level Makefile, and set HOST_GMPLIBS to include -Wl,-R/usr/local/lib.

There ought to be a more user friendly way of doing this, so I think this bug
ought to be reopened...

------- Comment #19 From Steve Kargl 2006-05-20 16:54 -------
Subject: Re:  ../.././libgfortran/mk-kinds-h.sh: Unknown type

On Sat, May 20, 2006 at 04:24:25PM -0000, prlw1 at cam dot ac dot uk wrote:
> 
> 
> ------- Comment #18 from prlw1 at cam dot ac dot uk  2006-05-20 16:24 -------
> I have just experienced exactly the same error on a
> NetBSD-current/i386 system.
> There the problem is not gmp et al.'s fault, and I can't see quite enough
> detail in the problem on alpha below to see that it isn't the same.
> 
> My system uses ELF binaries, and I don't set half the world in
> LD_LIBRARY_PATH nor ld.so.conf.

What happens if you use LD_LIBRARY_PATH?  What happens if
you use the dynamic loader as intended?

> There ought to be a more user friendly way of doing this, so I think
> this bug ought to be reopened...

I disagree with your conclusion.  LD_LIBRARY_PATH and ldconfig
are user friendly if you actually use the features as intended.

------- Comment #20 From Francois-Xavier Coudert 2006-05-20 20:07 -------
(In reply to comment #18)
> The error
>   /usr/src/local/gcc/libgfortran/mk-kinds-h.sh: Unknown type
> happens because gfortran was compiled without -Wl,-R/usr/local/lib, so it
> cannot find libmpr.
> 
> The top level configure accepts --with-mpfr=/usr/local --with-gmp=/usr/local,
> and doesn't spot any problems, as it AC_TRY_LINKs the libraries rather than
> AC_TRY_RUN them.

I'll note a few things here:
  - what you report is why PR 21547 was opened for: when you specify
--with-gmp=/usr/local, you still need to have /usr/local/lib in your
LD_LIBRARY_PATH to build libgfortran
  - this can be both seen as a bug or a non-bug; I think it's a bug, and if
deemed a feature, it should be strongly emphasized in the docs
  - I once proposed a patch, but top-level configury is a tough matter and we
never reached a consensus on how this should be handled, so the bug is still
there

If you want to be kept informed of the resolution of this issue, please add
yourself in the CC list of PR 21547.

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