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.

[Kohei Takahashi]

Try following.

1. Append below codes to project-config.jam

   module gcc
   {
       import toolset ;
       toolset.flags gcc OPTIONS <architecture>x86/<address-model>32_64 : "-mx32" ;
   }
   

2. Run b2 with address-model feature.

   $ ./b2 address-model=32_64
   

[ross@…]

In an attempt to have less magic I added the flags line to gcc.jam in build:

diff --git a/src/tools/gcc.py b/src/tools/gcc.py
index 270ca97..f31f4ef 100644
--- a/src/tools/gcc.py
+++ b/src/tools/gcc.py
@@ -746,2 +746,3 @@ def cpu_flags(toolset, variable, architecture, instruction_set, values, default=
 flags('gcc', 'OPTIONS', ['<architecture>x86/<address-model>32'], ['-m32'])
+flags('gcc', 'OPTIONS', ['<architecture>x86/<address-model>32_64'], ['-mx32'])
 flags('gcc', 'OPTIONS', ['<architecture>x86/<address-model>64'], ['-m64'])

Then passed address-model=32_64 to my externally built jam (we're cross-compiling).

It's passing less stupid options now:

|     "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 -pedantic -pthread -fPIC  -DBOOST_ALL_NO_LIB=1 -DBOOST_REGEX_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/regex/build/8b5ffabbece29b037869af5264487af2/winstances.o" "libs/regex/build/../src/winstances.cpp"

Now it fails differently:

libs/context/src/unsupported.cpp:7:2: error: #error "platform not supported"
 #error "platform not supported"

Presumably because this new 32_64 address-model doesn't match the build rules for context which use a 64-bit address-model but abi to mark x32:

# X86_64/SYSV/X32
alias asm_context_sources
   : [ make asm/make_x86_64_sysv_elf_gas.o : asm/make_x86_64_sysv_elf_gas.S : @gas64 ]
     [ make asm/jump_x86_64_sysv_elf_gas.o : asm/jump_x86_64_sysv_elf_gas.S : @gas64 ]
     [ make asm/ontop_x86_64_sysv_elf_gas.o : asm/ontop_x86_64_sysv_elf_gas.S : @gas64 ]
   : <abi>x32
     <address-model>64
     <architecture>x86
     <binary-format>elf
   ;

[Kohei Takahashi]

Ahh, I misunderstood about address-model feature, 32_64 is for the OS X fat binary at this time.

Hmm, it needs changing both of build and context, build should provide 'abi' feature (or address-model) and update setup-address-model, and context should change that requirements.