[GitHub] [mynewt-core] brainstorm opened a new issue #2076: multiple definition of `fflush'

[GitBox <gi...@apache.org>]

brainstorm opened a new issue #2076: multiple definition of `fflush'
URL: https://github.com/apache/mynewt-core/issues/2076
 
 
   While compiling this mynewt project: https://github.com/chris-zen/mdp-link-mynewt/ using the HEAD version of mynewt:
   
   ```shell
   $ newt version
   Apache Newt
      Version: 1.8.0-dev
     Git Hash: d703a10-dirty
   Build Date: 2019-10-30_23:28
   ```
   
   Running OSX Catalina 10.15, but the system's compiler is not cross-compiling this anyway (see further below for the affected GCC)
   
   ```
   $ gcc --version
   Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
   Apple clang version 11.0.0 (clang-1100.0.33.8)
   Target: x86_64-apple-darwin19.0.0
   Thread model: posix
   InstalledDir: /Library/Developer/CommandLineTools/usr/bin
   ```
   
   Anyway, the core of the issue is that I'm faced with this:
   
   ```shell
   (...)
   Archiving @tinyusb_tinyusb.a
   Archiving @apache-mynewt-core_util_mem.a
   Archiving @apache-mynewt-core_util_rwlock.a
   Linking /Users/romanvg/dev/mdp/mdp-link-mynewt/bin/targets/nrf52_mdp_link/app/apps/mdp-link/mdp-link.elf
   Error: /usr/local/Cellar/arm-none-eabi-gcc/20160926/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/libg.a(lib_a-fflush.o): In function `fflush':
   fflush.c:(.text.fflush+0x0): multiple definition of `fflush'
   /Users/romanvg/dev/mdp/mdp-link-mynewt/bin/targets/nrf52_mdp_link/app/@apache-mynewt-core/libc/baselibc/@apache-mynewt-core_libc_baselibc.a(inline.o):/Users/romanvg/dev/mdp/mdp-link-mynewt/repos/apache-mynewt-core/libc/baselibc/include/stdio.h:99: first defined here
   collect2: error: ld returned 1 exit status
   ```
   
   Which I temporarily solve modifying the `stdio.h` header under `repos/apache-mynewt-core/libc/baselibc/include/stdio.h`:
   
   ```diff
   $ git diff stdio.h.orig stdio.h
   diff --git a/libc/baselibc/include/stdio.h b/libc/baselibc/include/stdio.h
   index fa7103fd0..8ec0d27e1 100644
   --- a/libc/baselibc/include/stdio.h
   +++ b/libc/baselibc/include/stdio.h
   @@ -93,10 +93,12 @@ __extern_inline char *strerror(int errnum)
    #define getc(f) fgetc(f)
    #define getchar() fgetc(stdin)
   
   +/*
    __extern_inline int fflush(FILE *stream)
    {
           return 0;
    }
   +*/
   
    __extern int printf(const char *, ...);
    __extern int vprintf(const char *, va_list);
   ```
   
   And then it compiles/links successfully:
   
   ```
   $ newt build nrf52_mdp_link
   Building target targets/nrf52_mdp_link
   Target successfully built: targets/nrf52_mdp_link
   ```
   
   I guess I should get rid of my relatively old gcc homebrew dependency with proxmark3?:
   
   ```
   $ brew info arm-none-eabi-gcc
   proxmark/proxmark3/arm-none-eabi-gcc: stable 20160926
   GCC for embedded ARM processors
   https://launchpad.net/gcc-arm-embedded
   /usr/local/Cellar/arm-none-eabi-gcc/20160926 (5,502 files, 447.0MB) *
     Built from source on 2017-12-09 at 00:02:56
   From: https://github.com/proxmark/homebrew-proxmark3/blob/master/arm-none-eabi-gcc.rb
   ```
   
   Any suggestions on which brew formula to pull a newer compiler from are welcome since there seems to only be one `arm-none-eabi-gcc` on my Homebrew:
   
   ```shell
   $ brew search arm-none-eabi
   ==> Formulae
   proxmark/proxmark3/arm-none-eabi-gcc
   ```

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