Compilation fails in Sys.cpp on mingw/windows

[ciscoheat]

On Win 10, after installing the haxelib minimingw I'm setting the environment variable toolchain=mingw and try to compile a project with:

> haxe -cpp bin/cpp -D HXCPP_VERBOSE -lib travix -lib dataclass tests.hxml

tests.hxml:

-lib buddy
-lib deepstate
-cp ./tests/
-cp ./src/
-main Tests2

But it eventually fails with:

haxelib run hxcpp Build.xml haxe -DHXCPP_VERBOSE="1" -Dasynctools="0.1.0" -Dbuddy="2.10.0" -Dbuddy-colors="1" -Dbuddy_colors="1" -Ddataclass="1.5.1" -Ddataclass-date-auto-conversion="1" -Ddataclass_date_auto_conversion="1" -Ddeepstate="0.13.2" -Dhaxe3="1" -Dhaxe4="1" -Dhaxe_ver="4.000" -Dhxcpp_api_level="400" -Dpromhx="1.1.0" -Dpure="1" -Dsource-header="Generated by Haxe 4.0.0-rc.2+77068e10c" -Dstatic="1" -Dtarget.name="cpp" -Dtarget.static="true" -Dtarget.sys="true" -Dtarget.threaded="true" -Dtarget.utf16="true" -Dtink_chunk="0.2.0" -Dtink_cli="0.4.1" -Dtink_core="1.21.0" -Dtink_io="0.6.2" -Dtink_macro="0.17.4" -Dtink_streams="0.3.2" -Dtink_stringly="0.3.1" -Dtravix="0.12.2" -Duse-rtti-doc="1" -Duse_rtti_doc="1" -Dutf16="1" -I"./src/" -I"./tests/" -I"E:\\Projects\\Haxe\\deepstate\\src\\" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\promhx/1,1,0/src/main/" -I"E:\\Projects\\Haxe\\asynctools\\src\\" -I"e:\\Projects\\Haxe\\buddy\\src\\" -I"e:\\Projects\\Haxe\\dataclass\\src\\" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_stringly/0,3,1/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_macro/0,17,4/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_core/1,21,0/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_streams/0,3,2/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_chunk/0,2,0/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_io/0,6,2/src/" -I"e:\\Program\\HaxeToolkit\\haxe\\lib\\tink_cli/0,4,1/src/" -I"E:\\Projects\\Haxe\\travix\\src\\" -I"E:\\Program\\HaxeToolkit\\haxe\\extraLibs/" -I"" -I"E:\\Program\\HaxeToolkit\\haxe\\std/cpp/_std/" -I"E:\\Program\\HaxeToolkit\\haxe\\std/"
 __
/\ \
\ \ \___    __  _   ___   _____   _____
 \ \  _ `\ /\ \/'\ /'___\/\ '__`\/\ '__`\
  \ \ \ \ \\/>  <//\ \__/\ \ \L\ \ \ \L\ \
   \ \_\ \_\/\_/\_\ \____\\ \ ,__/\ \ ,__/
    \/_/\/_/\//\/_/\/____/ \ \ \/  \ \ \/
                            \ \_\   \ \_\
                             \/_/    \/_/

hxcpp (Haxe C++ Runtime Support) (4.0.8)

Using makefile: Build.xml
Reading HXCPP config: C:\Users\thedc\.hxcpp_config.xml
{}Using target toolchain: mingw

 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/setup.xml
 - Parsing include: C:\Users\thedc\.hxcpp_config.xml (section "vars")
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/finish-setup.xml
 - Parsing makefile: E:\Projects\Haxe\dataclass\bin\cpp\Build.xml
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/build-tool/BuildCommon.xml
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/haxe-target.xml
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/regexp/Build.xml
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Build.xml
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/mingw-toolchain.xml
Using haxelib version of MinGW, e:\Program\HaxeToolkit\haxe\lib\minimingw/1,0,0/
 - Adding path: e:\Program\HaxeToolkit\haxe\lib\minimingw/1,0,0//bin
 - Parsing include: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/gcc-toolchain.xml
 - Parsing compiler: e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/toolchain/common-defines.xml
 - Parsing include: C:\Users\thedc\.hxcpp_config.xml (section "exes")

Using compile threads: 8

 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/InheritanceTests.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_InheritanceTests.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/OptionObjTest.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_OptionObjTest.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/OptionTest.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_OptionTest.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/DynamicAccessTest.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_DynamicAccessTest.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/ComplexChapter.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_ComplexChapter.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/SimpleChapter.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_SimpleChapter.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/Tests2.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_Tests2.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/Document.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_Document.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/Validator.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_Validator.o
 - Running command: g++.exe -Iinclude -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 ./src/DefaultValue.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/a1dd6e32_DefaultValue.o
 - Running command: g++.exe -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/28a13fcb_Sys.o
 - Running command: g++.exe -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/File.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/28a13fcb_File.o

Error: Error while running command
g++.exe -c -Wno-overflow -O2 -DHXCPP_VISIT_ALLOCS -DHXCPP_API_LEVEL=400 -DHX_WINDOWS -m32 -Ie:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/include -x c++ -frtti -Wno-invalid-offsetof -std=c++11 e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp -oE:/Projects/Haxe/dataclass/bin/cpp/obj/mingw/28a13fcb_Sys.o

e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp: In function 'void _hx_std_put_env(String, String)':
e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp:97:28: error: 'putenv' was not declared in this scope
    bool ok = putenv(set.__s) == 0;
                            ^
e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp: In function 'String _hx_std_get_cwd()':
e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp:180:41: warning: NULL used in arithmetic [-Wpointer-arith]
    if( GetCurrentDirectoryW(260,buf) == NULL )
                                         ^
e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp: In function 'Array<String> _hx_std_sys_env()':
e:/Program/HaxeToolkit/haxe/lib/hxcpp/4,0,8/src/hx/libs/std/Sys.cpp:722:15: error: 'environ' was not declared in this scope
    char **e = environ;
               ^
Error: Build failed

Since the errors happen in Sys.cpp, I'm at a loss here. Let me know if you need anything else!