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go/misc/cgo/fortran/testdata/testprog/answer.f90
Austin Clements 1e9a7550a8 misc/cgo/fortran: convert to Go test
Currently, the entry-point to this test is a Bash script that smoke
tests the FORTRAN compiler and then runs a FORTRAN-containing Go test.
This CL rearranges things so a pure Go Go test smoke tests the FORTRAN
compiler and then runs a non-test FORTRAN-containing Go binary.

While we're here, we fix a discrepancy when the host is GOARCH=amd64,
but the target is GOARCH=386. Previously, we would pick the wrong
libgfortran path because we didn't account for the cross-compilation,
causing the link to fail. Except for some reason this was ignored and
the test nevertheless "passed". In the new test we're a little more
strict, so this build failure will cause the test to fail, so we add a
little logic to account for cross-compilation with the host toolchain.

For #37486.

Change-Id: Ie6f70066885d6fbb4e1b5a2b1e13b85dee5b359b
Reviewed-on: https://go-review.googlesource.com/c/go/+/443069
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Austin Clements <austin@google.com>
2022-10-17 15:15:37 +00:00

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Fortran

! Copyright 2016 The Go Authors. All rights reserved.
! Use of this source code is governed by a BSD-style
! license that can be found in the LICENSE file.
function the_answer() result(j) bind(C)
use iso_c_binding, only: c_int
integer(c_int) :: j ! output
j = 42
end function the_answer