[MFEM] Add sequential version (#4915)

* [Add MFEM]

a lightweight, general, scalable C++ library for finite element methods

* [MFEM] Clean cmake  cmd

Co-authored-by: Mosè Giordano <[email protected]>

* [MFEM] try all platforms

Co-authored-by: Mosè Giordano <[email protected]>

* [MFEM] expand cxx string ABIs

Co-authored-by: Mosè Giordano <[email protected]>

* [MFEM] use GCC 5

MFEM 4 requires GCC 4.9 at least.

* [MFEM] Add patch for building on Musl

* [MFEM] use GCC v6

GCC 6 might be necessary for boolean enums

Co-authored-by: Mosè Giordano <[email protected]>

* [MFEM] move seq build in dedicated folder

* [MFEM] try GCC v7

Co-authored-by: Mosè Giordano <[email protected]>

* [MFEM] try GCC 8

Co-authored-by: Mosè Giordano <[email protected]>

Author: Antoinemarteau

M/MFEM/MFEM_seq/build_tarballs.jl

@@ -0,0 +1,47 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, Pkg
+
+name = "MFEM_seq"
+version = v"4.4.0"
+
+# Collection of sources required to complete build
+sources = [
+    GitSource("https://github.com/mfem/mfem.git",
+              "a1f6902ed72552f3e680d1489f1aa6ade2e0d3b2"),
+    DirectorySource("./bundled"),
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+cd $WORKSPACE/srcdir/mfem*
+
+# Backport https://github.com/mfem/mfem/pull/2995 to be able to compile with Musl
+atomic_patch -p1 ../patches/0001-use_overloaded_function_definitions_instead_of_unreliable_macros.diff
+
+mkdir build; cd build
+cmake -DCMAKE_INSTALL_PREFIX=${prefix} \
+    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TARGET_TOOLCHAIN} \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=1 \
+    ..
+make -j${nproc}
+make install
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = supported_platforms()
+platforms = expand_cxxstring_abis(platforms)
+
+# The products that we will ensure are always built
+products = [
+    LibraryProduct("libmfem", :libmfem)
+]
+
+# Dependencies that must be installed before this package can be built
+dependencies = Dependency[
+]
+
+# Build the tarballs, and possibly a `build.jl` as well.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6", preferred_gcc_version=v"8")

M/MFEM/MFEM_seq/bundled/patches/0001-use_overloaded_function_definitions_instead_of_unreliable_macros.diff

@@ -0,0 +1,45 @@
+diff --git a/general/zstr.hpp b/general/zstr.hpp
+index 716aa19c3..f55e0cc56 100644
+--- a/general/zstr.hpp
++++ b/general/zstr.hpp
+@@ -59,6 +59,18 @@
+ namespace strict_fstream
+ {
+ 
++// Overloaded error checks to handle POSIX and GNU strerror_r
++inline char* check_strerror_r(int r, char* buff, int err)
++{
++   if (r) { sprintf(buff, "unknown error: %d", err); }
++   return buff;
++}
++
++inline char* check_strerror_r(char* r, char*, int)
++{
++   return r;
++}
++
+ /// Overload of error-reporting function, to enable use with VS.
+ /// Ref: http://stackoverflow.com/a/901316/717706
+ static std::string strerror()
+@@ -69,18 +81,10 @@ static std::string strerror()
+    {
+       buff = "Unknown error";
+    }
+-#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE || \
+-      defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || \
+-      defined(__NetBSD__) || defined(__DragonFly__) || defined(__EMSCRIPTEN__)
+-   // XSI-compliant strerror_r()
+-   if (strerror_r(errno, &buff[0], buff.size()) != 0)
+-   {
+-      buff = "Unknown error";
+-   }
+ #else
+-   // GNU-specific strerror_r()
+-   auto p = strerror_r(errno, &buff[0], buff.size());
+-   std::string tmp(p, std::strlen(p));
++   char* p = check_strerror_r(strerror_r(errno, &buff[0], buff.size()), &buff[0],
++                              buff.size());
++   std::string tmp(p, std::strlen(&buff[0]));
+    std::swap(buff, tmp);
+ #endif
+    buff.resize(buff.find('\0'));