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README_IOS.md

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Compile info

The smallest package is obtain by using ./EmbErl.sh -s -c (~2.0mb).

Progress

    • Autoconfigure works
    • Configure works
    • Host compilation works
    • Host linking works
    • Target compilation works
    • Target linking fails
    • Bundling
    • Execution

Todos

Add following libraries:

  • compiler (done! Compiler works! now we can compile on the AppleTV)
  • sasl
  • crypto
  • ssl
  • public_key
  • mnesia
  • inets
  • tools

Test some system parameters:

  • Run > erlang:system_info(X). to see the configuration

Hurdles

Compile and Link Binary location and filenames

Problem

Just setting the host variable and then let the binaries filename guess like $HOST-gcc does not work for the iOS toolchain, because the binary filenames are cctually named like $HOST-gcc-$VERSION.

Solution

Set them correctly.

Undetermined endianness

Problem

The endianness can not be determined by the autoconfigure script and is also not set with a default value.

Solution

As the arm-apple-darwin iOS platform uses little-endian, set the big-endian autoconfigure flag to no:

erl_xcomp_bigendian=no

Not available -m32 flag

Problem

The -m32 flag is usually set to explicitly express that the system should be build for a 32-bit architecture. But the iOS GCC compiler for ARM does not support this flag (yet, as all ARM chips are supposed to not have 64 bit support).

Solution

Apply patch to not create the -m32 flag in configure files. (See patch file).

bp_sched2ix function not defined

Problem

A function was introduced in commit ff9531eb5e6aaa5a4802db0db5e0e850f4233702 (https://github.com/erlang/otp/commit/ff9531eb5e6aaa5a4802db0db5e0e850f4233702). This function creates problems only so far when linking for an arm-apple-darwin platform.

Issues while compiling:

  • erl_init.o
  • erl_bif_trace.o
  • erl_trace.o
  • bif.o
  • erl_process.o
  • erl_nif.o
  • beam_emu.o
  • beam_bif_load.o
  • beam_debug.o

beam/beam_bp.h:147: warning: inline function ‘bp_sched2ix’ declared but never defined

This leads to:

Undefined symbols:
  "_bp_sched2ix", referenced from:
        _load_nif_2 in erl_nif.o
        ld: symbol(s) not found
        collect2: ld returned 1 exit status
        make[3]: ***
  [/Users/uwe/dev/erlang-embedded/otp_src_R14B01/bin/arm-apple-darwin10/beam]
  Error 1
  make[2]: *** [opt] Error 2
  make[1]: *** [opt] Error 2
  make: *** [emulator] Error 2

The implementation looks like that:

erts/emulator/beam/beam_bp.h:
ERTS_INLINE Uint bp_sched2ix(void);

erts/emulator/beam/beam_bp.c:
/* bp_hash */
ERTS_INLINE Uint bp_sched2ix() {
#ifdef ERTS_SMP
    ErtsSchedulerData *esdp;
    esdp = erts_get_scheduler_data();
    return esdp->no - 1;
#else
    return 0;
#endif
}

Solution

Remove the -std=c99 flag from the CFLAG flag.

Missing utmp.h file in run_erl.c issues

Problem

../unix/run_erl.c:70:20: error: utmp.h: No such file or directory

This file is needed because of the time_t struct. This file in fact exists on the OS X system SDK and the iPhone simulator SDK, but not in the iPhone SDK. There, the missing struct exists in the utime.h file.

Solution

Patch the run_erl.c file to use utime.h instead of utmp.h. (Or copy the utmp.h file into the iPhone SDK).