id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12616	Cannot build boost 1.62 for x32 ABI	ross@…		"To build boost for the X32 ABI (which is x86-64 but with 32-bit pointers) we set CFLAGS to -mx32.

However boost then decides that it knows best and also passes in -march=i686 -m32.

For example:

{{{
|     ""x86_64-poky-linux-gnux32-g++"" ""-mx32"" ""-Wl,-O1"" ""-Wl,--hash-style=gnu"" ""-Wl,--as-needed"" ""--sysroot=/data/poky-master/tmp-glibc/sysroots/intel-corei7-64""  -ftemplate-depth-128  -O2 -pipe -g -feliminate-unused-debug-types -fdebug-prefix-map=/data/poky-master/tmp-glibc/work/x86_64_x32-poky-linux-gnux32/boost/1.62.0-r1=/usr/src/debug/boost/1.62.0-r1 -fdebug-prefix-map=/data/poky-master/tmp-glibc/sysroots/x86_64-linux= -fdebug-prefix-map=/data/poky-master/tmp-glibc/sysroots/intel-corei7-64=  -fvisibility-inlines-hidden -O3 -finline-functions -Wno-inline -Wall -march=i686 -pthread -fPIC -m32  -DBOOST_ALL_NO_LIB=1 -DBOOST_FILESYSTEM_DYN_LINK=1 -DBOOST_SYSTEM_DYN_LINK=1 -DNDEBUG  -I""."" -c -o ""/data/poky-master/tmp-glibc/work/x86_64_x32-poky-linux-gnux32/boost/1.62.0-r1/boost_1_62_0/x86_64-poky-linux-gnux32/boost/bin.v2/libs/filesystem/build/aca09349fdb84d131321425f6c3a38ed/windows_file_codecvt.o"" ""libs/filesystem/src/windows_file_codecvt.cpp""
|
| In file included from /data/poky-master/tmp-glibc/sysroots/intel-corei7-64/usr/include/features.h:392:0,
|                  from /data/poky-master/tmp-glibc/sysroots/intel-corei7-64/usr/include/c++/6.2.0/x86_64-poky-linux-gnux32/bits/os_defines.h:39,
|                  from /data/poky-master/tmp-glibc/sysroots/intel-corei7-64/usr/include/c++/6.2.0/x86_64-poky-linux-gnux32/bits/c++config.h:495,
|                  from /data/poky-master/tmp-glibc/sysroots/intel-corei7-64/usr/include/c++/6.2.0/cstddef:49,
|                  from ./boost/config/compiler/gcc.hpp:165,
|                  from ./boost/config.hpp:39,
|                  from ./boost/filesystem/config.hpp:28,
|                  from libs/filesystem/src/windows_file_codecvt.cpp:20:
| /data/poky-master/tmp-glibc/sysroots/intel-corei7-64/usr/include/gnu/stubs.h:7:27: fatal error: gnu/stubs-32.h: No such file or directory
|  # include <gnu/stubs-32.h>
}}}

The -mx32 is our CFLAGS.  -m32 -march=i686 is from boost/tools/build.  The compiler ends up thinking that its doing a i686 build and tries to open stubs-32.h which doesn't exist as this sysroot is x32 so only stubs-x32.h is present."	Bugs	new	To Be Determined	Building Boost	Boost 1.62.0	Problem