MSYS2-packages/autoconf2.72/0006-fortran-mingw-libs.patch
Markus Mützel 0c6b09d83e autoconf2.72: Don't strip MinGW libraries from Fortran linker flags
Stripping `-lmingwex` from the Fortran standard linker flags can lead to
a situation where the first `-lmsvcrt` can appear before the first
`-lmingwex` for a library that consists of Fortran and C++ sources.
That means that the linker picks some functions from the Windows CRT that
should instead be picked from `libmingwex.a`.

It took quite some time to figure out an odd behavior when calling
`std::asin` with a complex double precision value with a real part larger
than 1 in such a library.
See also: https://octave.discourse.group/t/6026/75

Also don't strip `-lmoldname` from these flags because there is no reason
to do that as far as I can tell.

This essentially reverts the upstream changes from:
https://lists.gnu.org/r/autoconf-patches/2021-09/msg00000.html
2024-12-11 20:53:52 +01:00

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Diff

Do not strip mingw libraries from list of Fortran standard linker flags.
diff -urN autoconf-2.72/lib/autoconf/fortran.m4.orig autoconf-2.72/lib/autoconf/fortran.m4
--- autoconf-2.72/lib/autoconf/fortran.m4.orig 2024-10-30 13:31:24.456674400 +0100
+++ autoconf-2.72/lib/autoconf/fortran.m4 2024-12-11 16:08:46.415095400 +0100
@@ -705,7 +705,7 @@
-lang* | -lcrt*.o | -lc | -lgcc* | -lSystem | -libmil | -little \
|-LANG:=* | -LIST:* | -LNO:* | -link)
;;
- -lkernel32 | -lmingw* | -lmoldname)
+ -lkernel32)
# Ignore this library only on Windows-like systems.
case $host_os in
cygwin* | msys* | mingw* | windows*) ;;