[package] libiconv/1.15: Fails to cross compile on windows

Package and Environment Details (include every applicable attribute)

• Package Name/Version: libiconv/1.15
• Operating System+version: Windows 10
• Compiler+version: Visual Studio 2017 15.9.14
• Conan version: conan 1.20.3
• Python version: Python 3.8.0

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

[settings]
os=Windows
os_build=Windows
arch=x86
arch_build=x86_64
compiler=Visual Studio
compiler.version=15
build_type=RelWithDebInfo
[options]
[build_requires]
[env]

Steps to reproduce (Include if Applicable)

1. conan remote add bincrafters "https://api.bintray.com/conan/bincrafters/public-conan"

2. git clone https://github.com/bincrafters/conan-qt.git

3. cd conan-qt

4. git checkout stable/5.13.2

5. conan create . qt/5.13.2@bincrafters/stable --build missing

Logs (Include/Attach if Applicable)

Click to expand log

libiconv/1.15: Applying build-requirement: msys2/20161025
libiconv/1.15: Copying sources to build folder
libiconv/1.15: Building your package in C:\projects\.conan\data\libiconv\1.15\_\_\build\d3c57f1b4faa70d5d60e94d8531667d77c8367ac
libiconv/1.15: Generator txt created conanbuildinfo.txt
libiconv/1.15: Calling build()
**********************************************************************
** Visual Studio 2017 Developer Command Prompt v15.9.14
** Copyright (c) 2017 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x86'
libiconv/1.15: run_in_windows_bash: C:\projects\.conan\data\msys2\20161025\_\_\package\3cbd862cb7a3ea47ed1220dc027f344262d5224f\bin\usr\bin\bash.exe --login -c ^"cd \^"/c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder\^" ^&^& PATH=\^"/c/projects/.conan/data/msys2/20161025/_/_/package/3cbd862cb7a3ea47ed1220dc027f344262d5224f/bin/usr/bin:$PATH\^" ^&^& chmod +x build-aux/ar-lib build-aux/compile ^"
libiconv/1.15: Calling:
 > /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/configure --prefix=C:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac --enable-static --disable-shared CPPFLAGS=-IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib RANLIB=: "CC=$PWD/build-aux/compile cl -nologo" CFLAGS=-MD "CXX=$PWD/build-aux/compile cl -nologo" CXXFLAGS=-MD "CPPFLAGS=-D_WIN32_WINNT=0x0600 -IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include" LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib LD=link "NM=dumpbin -symbols" STRIP=: "AR=$PWD/build-aux/ar-lib lib" RANLIB=: --host=i686-windows-msvc
libiconv/1.15: run_in_windows_bash: C:\projects\.conan\data\msys2\20161025\_\_\package\3cbd862cb7a3ea47ed1220dc027f344262d5224f\bin\usr\bin\bash.exe --login -c ^"cd \^"/c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder\^" ^&^& PATH=\^"/c/projects/.conan/data/msys2/20161025/_/_/package/3cbd862cb7a3ea47ed1220dc027f344262d5224f/bin/usr/bin:$PATH\^" ^&^& /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/configure --prefix=C:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac --enable-static --disable-shared CPPFLAGS=-IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib RANLIB=: \^"CC=$PWD/build-aux/compile cl -nologo\^" CFLAGS=-MD \^"CXX=$PWD/build-aux/compile cl -nologo\^" CXXFLAGS=-MD \^"CPPFLAGS=-D_WIN32_WINNT=0x0600 -IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include\^" LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib LD=link \^"NM=dumpbin -symbols\^" STRIP=: \^"AR=$PWD/build-aux/ar-lib lib\^" RANLIB=: --host=i686-windows-msvc ^"
libiconv/1.15: configure: loading site script /mingw32/etc/config.site
libiconv/1.15: checking for a BSD-compatible install... /usr/bin/install -c
libiconv/1.15: checking whether build environment is sane... yes
libiconv/1.15: checking for i686-windows-msvc-strip... :
libiconv/1.15: checking for a thread-safe mkdir -p... /c/projects/.conan/data/msys2/20161025/_/_/package/3cbd862cb7a3ea47ed1220dc027f344262d5224f/bin/usr/bin/mkdir -p
libiconv/1.15: checking for gawk... gawk
libiconv/1.15: checking whether make sets $(MAKE)... yes
libiconv/1.15: checking whether make supports nested variables... yes
libiconv/1.15: checking whether make sets $(MAKE)... (cached) yes
libiconv/1.15: checking for i686-windows-msvc-gcc... /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo
libiconv/1.15: checking whether the C compiler works... yes
libiconv/1.15: checking for C compiler default output file name... conftest.exe
libiconv/1.15: checking for suffix of executables... .exe
libiconv/1.15: checking whether we are cross compiling... no
libiconv/1.15: checking for suffix of object files... obj
libiconv/1.15: checking whether we are using the GNU C compiler... no
libiconv/1.15: checking whether /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo accepts -g... no
libiconv/1.15: checking for /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo option to accept ISO C89... none needed
libiconv/1.15: checking whether /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo understands -c and -o together... yes
libiconv/1.15: checking for style of include used by make... GNU
libiconv/1.15: checking dependency style of /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo... none
libiconv/1.15: checking how to run the C preprocessor... /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/build-aux/compile cl -nologo -E
libiconv/1.15: checking for strip... /c/projects/.conan/data/msys2/20161025/_/_/package/3cbd862cb7a3ea47ed1220dc027f344262d5224f/bin/usr/bin/strip
libiconv/1.15: checking build system type... i686-w64-mingw32
! libiconv/1.15: checking host system type... Invalid configuration `i686-windows-msvc': system `msvc' not recognized
! libiconv/1.15: configure: error: /bin/sh build-aux/config.sub i686-windows-msvc failed
libiconv/1.15: 
libiconv/1.15: WARN: Package is corrupted, removing folder: C:\projects\.conan\data\libiconv\1.15\_\_\package\d3c57f1b4faa70d5d60e94d8531667d77c8367ac
libiconv/1.15: WARN: Build folder is dirty, removing it: C:\projects\.conan\data\libiconv\1.15\_\_\build\d3c57f1b4faa70d5d60e94d8531667d77c8367ac
libiconv/1.15: WARN: Error running `configure --help`: Error 1 while executing /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/configure --help
libiconv/1.15: ERROR: Package 'd3c57f1b4faa70d5d60e94d8531667d77c8367ac' build failed
libiconv/1.15: WARN: Build folder C:\projects\.conan\data\libiconv\1.15\_\_\build\d3c57f1b4faa70d5d60e94d8531667d77c8367ac
ERROR: libiconv/1.15: Error in build() method, line 115
	self._build_autotools()
while calling '_build_autotools', line 109
	env_build.configure(args=configure_args, host=host, build=build)
	ConanException: Error 1 while executing /c/projects/.conan/data/libiconv/1.15/_/_/build/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/source_subfolder/configure --prefix=C:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac --enable-static --disable-shared CPPFLAGS=-IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib RANLIB=: "CC=$PWD/build-aux/compile cl -nologo" CFLAGS=-MD "CXX=$PWD/build-aux/compile cl -nologo" CXXFLAGS=-MD "CPPFLAGS=-D_WIN32_WINNT=0x0600 -IC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/include" LDFLAGS=-LC:/projects/.conan/data/libiconv/1.15/_/_/package/d3c57f1b4faa70d5d60e94d8531667d77c8367ac/lib LD=link "NM=dumpbin -symbols" STRIP=: "AR=$PWD/build-aux/ar-lib lib" RANLIB=: --host=i686-windows-msvc

Context

I’m trying to cross compile Qt 5.13.2 on Windows using VS2017 15.9.14, but the Qt package fails when cross compiling one of its dependencies: libiconv/1.15.

Worth noting, if I change my profile to purposefully target x64 bit binaries, libiconv/1.15 seems to build okay

[thorntonryan]

So, cross_building defaults its value of build_arch to the detected_architecture(), which I assume is being derived based on ~whether conan / Python are 32 or 64 bit~ some heuristic I can’t figure out how to circumvent … grrr.

~I think it should work if I were to use a 32 bit version of conan / Python…~

Ok, so detected_architecture() falls because it relies on a simple heuristic coming from here: https://github.com/conan-io/conan/blob/eadcd70ec7ccedc6d90b5360feff421e46cc6582/conans/client/tools/oss.py#L69

Which relies on platform.machine which comes from lib/platform.py

On Windows, this appears to look at the environment variable PROCESSOR_ARCHITECTURE, which reported AMD64, thus triggering cross_building to report True.

I can trick this Conan package to pretend it’s not cross-compiling by setting the following environment variable:

SET PROCESSOR_ARCHITECTURE=i386

This allows me to create the package without modifying the package recipe (suggested by @kunitsyn)

[akemimadoka]

Seems it’s my fault, here should be an exception for msvc cross building.

But when I changed host to i686-w64-mingw32 by changing if not tools.cross_building(self.settings) to if not tools.cross_building(self.settings) or self._is_msvc: I got “fatal error LNK1112: module machine type ‘x64’ conflicts with target machine type ‘X86’”, seems here are more works to do.