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p1xelHer0/FFI-2.md

Created January 3, 2024 11:58
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Gerbil macOS ncurses FFI
Raw
FFI-2.md

macOS Ventura 13.6.2

Gerbil v0.18-62-gf7d8efcf on Gambit v4.9.5-78-g8b18ab69

λ echo $CC
gcc-13

Running brew info ncurses gives us the following part:

If you need to have ncurses first in your PATH, run:
  echo 'export PATH="/opt/homebrew/opt/ncurses/bin:$PATH"' >> ~/.zshrc

For compilers to find ncurses you may need to set:
  export LDFLAGS="-L/opt/homebrew/opt/ncurses/lib"
  export CPPFLAGS="-I/opt/homebrew/opt/ncurses/include"

For pkg-config to find ncurses you may need to set:
  export PKG_CONFIG_PATH="/opt/homebrew/opt/ncurses/lib/pkgconfig"

Right now, I can't use pkg-config ncurses with --libs or with --cflags.

Let's set PKG_CONFIG_PATH to fix that.

export PKG_CONFIG_PATH="/opt/homebrew/opt/ncurses/lib/pkgconfig"

After that both of them work:

λ pkg-config ncurses --libs
-L/opt/homebrew/Cellar/ncurses/6.4/lib -Wl,-search_paths_first -lncursesw
λ pkg-config ncurses --cflags
-D_DARWIN_C_SOURCE -DNCURSES_WIDECHAR -I/opt/homebrew/Cellar/ncurses/6.4/include/ncursesw -I/opt/homebrew/Cellar/ncurses/6.4/include

:std/make provides helper functions for setting both ldflags and cppflags. If I've read the source code correctly these should both first try to use pkg-config to get --libs and --cflags respectively. If pkg-config fails they fallback to the second argument of the function.

Combined with the info from brew info ncurses before I landed in the following:

#!/usr/bin/env gxi
;;; -*- Gerbil -*-
(import :std/build-script
        :std/make)

; Can we do this outside of the `defbuild-script`?
; Where else would I put this?
(setenv "PKG_CONFIG_PATH" "/opt/homebrew/opt/ncurses/lib/pkgconfig")

; `build.ss` expects a `main` function
; `defbuild-script` is a helper to create that
(defbuild-script
  `("rogue/lib" "rogue/ncurses"
    (exe: "rogue/main" bin: "rogue"
          ; I looked in some other code to see how these functions are used
          ; https://github.com/mighty-gerbils/gerbil/blob/f7d8efcf4a25014b4b969eb6e21a3006d256f22e/src/std/build-spec.ss#L201
          ; if `PKG_CONFIG_PATH` is set correctly here then these should succeed?
          "-cc-options" ,(cppflags "ncurses" "")
          "-ld-options" ,(ldflags "ncurses" "-lncurses"))))

The link: https://github.com/mighty-gerbils/gerbil/blob/f7d8efcf4a25014b4b969eb6e21a3006d256f22e/src/std/build-spec.ss#L201

I tried finding more info about constructing your own make function but my Gerbil-foo is too low to understand what the defbuild-script does I am afraid :(

Perhaps the most important question: the Gerbil file in question looks like this, is this correct?!

;;; -*- Gerbil -*-
(import :std/foreign)
(export #t)

(begin-ffi (initscr)

  (c-declare "#include <ncurses.h>")

  (define-c-lambda initscr () void "initscr"))

Running gxpkg build

λ gxpkg build
... build in current directory
... compile rogue/ncurses
ld: Undefined symbols:
  _initscr, referenced from:
      ____H_ncurses____0 in ncurses__0.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
"gcc"
*** Unhandled exception in #<thread #45>

*** ERROR IN ?
--- Syntax Error at compile: Compilation error; process exit with nonzero status
... form:   Continuation backtrace:
[0] gxc#gsc-compile-file                                                              
[1] gxc#compile-scm-file__%                                                           
[2] gxc#compile-runtime-code                                                          
[3] gxc#compile-runtime-code                                                          
*** ERROR IN std/misc/concurrent-plan#perform-plan/threads__% -- Build Failure at rogue/ncurses

*** ERROR IN ?
--- Syntax Error at compile: Compilation error; process exit with nonzero status
... form:   "gcc"
*** ERROR IN std/misc/process#run-process__% --
*** ERROR IN "misc/process.ss"@28.35-28.46 [ProcessError]: process exited with non-zero status
--- irritants: "/Users/p1xelher0/code/github/p1xelHer0/rogue-gerbil/build.ss" 17920 (path: "/Users/p1xelher0/code/github/p1xelHer0/rogue-gerbil/build.ss" arguments: ("compile") environment: #f directory: #f stdin-redirection: #t stdout-redirection: #f stderr-redirection: #f pseudo-terminal: #f show-console: #f)
--- continuation backtrace:
[0] raise                                                                             
[1] std/misc/process#run-process__%                                                                                                                                            ((if (let () (declare (not safe)) (procedure? _check-status568387_)) _check-s...

It's worth noting that I can compile the following C program.

#include <ncurses.h>

int main(int argc, char **argv)
{
    initscr();

    WINDOW *win = newwin(5, 10, 0, 0);
    refresh();

    box(win, 0, 0);

    mvwprintw(win, 2, 2, "Hello");

    wrefresh(win);

    getch();
    endwin();
    return 0;
}

Compiling with gcc-13:

λ gcc-13 test.c -o test.out -lncurses -v
Using built-in specs.
COLLECT_GCC=gcc-13
COLLECT_LTO_WRAPPER=/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/lto-wrapper
Target: aarch64-apple-darwin22
Configured with: ../configure --prefix=/opt/homebrew/opt/gcc --libdir=/opt/homebrew/opt/gcc/lib/gcc/current --disable-nls --enable-checking=release --with-gcc-major-version-only --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-13 --with-gmp=/opt/homebrew/opt/gmp --with-mpfr=/opt/homebrew/opt/mpfr --with-mpc=/opt/homebrew/opt/libmpc --with-isl=/opt/homebrew/opt/isl --with-zstd=/opt/homebrew/opt/zstd --with-pkgversion='Homebrew GCC 13.2.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --with-system-zlib --build=aarch64-apple-darwin22 --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Homebrew GCC 13.2.0)
COLLECT_GCC_OPTIONS='-o' 'test.out' '-v' '-mmacosx-version-min=13.0.0' '-asm_macosx_version_min=13.0' '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out-'
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/cc1 -quiet -v -iprefix /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/ -D__DYNAMIC__ test.c -fPIC -quiet -dumpdir test.out- -dumpbase test.c -dumpbase-ext .c -mmacosx-version-min=13.0.0 -mlittle-endian -mabi=lp64 -version -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccodHRh5.s
GNU C17 (Homebrew GCC 13.2.0) version 13.2.0 (aarch64-apple-darwin22)
        compiled by GNU C version 13.2.0, GMP version 6.2.1, MPFR version 4.2.0-p12, MPC version 1.3.1, isl version isl-0.26-GMP

warning: GMP header version 6.2.1 differs from library version 6.3.0.
warning: MPFR header version 4.2.0-p12 differs from library version 4.2.1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../../../../aarch64-apple-darwin22/include"
ignoring duplicate directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/local/include"
ignoring duplicate directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include-fixed"
ignoring nonexistent directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../../../../aarch64-apple-darwin22/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include-fixed
 /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks
End of search list.
Compiler executable checksum: 1ed03ec2fbe7f047297ce1fbd4c59f18
COLLECT_GCC_OPTIONS='-o' 'test.out' '-v' '-mmacosx-version-min=13.0.0'  '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out-'
 as -arch arm64 -v -mmacosx-version-min=13.0 -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccACXEB9.o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccodHRh5.s
Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin22.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1as -triple arm64-apple-macosx13.0.0 -filetype obj -main-file-name ccodHRh5.s -target-cpu apple-m1 -target-feature +v8.5a -target-feature +crc -target-feature +lse -target-feature +rdm -target-feature +crypto -target-feature +dotprod -target-feature +fp-armv8 -target-feature +neon -target-feature +fp16fml -target-feature +ras -target-feature +rcpc -target-feature +zcm -target-feature +zcz -target-feature +fullfp16 -target-feature +sm4 -target-feature +sha3 -target-feature +sha2 -target-feature +aes -fdebug-compilation-dir=/Users/p1xelher0/code/github/p1xelHer0/rogue-gerbil -dwarf-debug-producer "Apple clang version 15.0.0 (clang-1500.1.0.2.5)" -dwarf-version=4 -mrelocation-model pic --mrelax-relocations -mllvm -disable-aligned-alloc-awareness=1 -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccACXEB9.o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccodHRh5.s
COMPILER_PATH=/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/
LIBRARY_PATH=/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../
COLLECT_GCC_OPTIONS='-o' 'test.out' '-v' '-mmacosx-version-min=13.0.0'  '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out.'
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/collect2 -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/ -dynamic -arch arm64 -platform_version macos 13.0.0 0.0 -o test.out -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13 -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../.. /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccACXEB9.o -lncurses -lemutls_w -lgcc -lSystem -lgcc -no_compact_unwind -rpath @loader_path -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin22/13 -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current
ld: warning: ignoring duplicate libraries: '-lgcc'
g

Compiling with flags from pkg-config

λ gcc-13 test.c -o test.out `pkg-config ncurses --libs --cflags` -v
Using built-in specs.
COLLECT_GCC=gcc-13
COLLECT_LTO_WRAPPER=/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/lto-wrapper
Target: aarch64-apple-darwin22
Configured with: ../configure --prefix=/opt/homebrew/opt/gcc --libdir=/opt/homebrew/opt/gcc/lib/gcc/current --disable-nls --enable-checking=release --with-gcc-major-version-only --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-13 --with-gmp=/opt/homebrew/opt/gmp --with-mpfr=/opt/homebrew/opt/mpfr --with-mpc=/opt/homebrew/opt/libmpc --with-isl=/opt/homebrew/opt/isl --with-zstd=/opt/homebrew/opt/zstd --with-pkgversion='Homebrew GCC 13.2.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --with-system-zlib --build=aarch64-apple-darwin22 --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.0 (Homebrew GCC 13.2.0)
COLLECT_GCC_OPTIONS='-o' 'test.out' '-D' '_DARWIN_C_SOURCE' '-D' 'NCURSES_WIDECHAR' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include/ncursesw' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include' '-L/opt/homebrew/Cellar/ncurses/6.4/lib' '-v' '-mmacosx-version-min=13.0.0' '-asm_macosx_version_min=13.0' '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out-'
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/cc1 -quiet -v -I /opt/homebrew/Cellar/ncurses/6.4/include/ncursesw -I /opt/homebrew/Cellar/ncurses/6.4/include -iprefix /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/ -D__DYNAMIC__ -D _DARWIN_C_SOURCE -D NCURSES_WIDECHAR test.c -fPIC -quiet -dumpdir test.out- -dumpbase test.c -dumpbase-ext .c -mmacosx-version-min=13.0.0 -mlittle-endian -mabi=lp64 -version -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//cchnwnwa.s
GNU C17 (Homebrew GCC 13.2.0) version 13.2.0 (aarch64-apple-darwin22)
        compiled by GNU C version 13.2.0, GMP version 6.2.1, MPFR version 4.2.0-p12, MPC version 1.3.1, isl version isl-0.26-GMP

warning: GMP header version 6.2.1 differs from library version 6.3.0.
warning: MPFR header version 4.2.0-p12 differs from library version 4.2.1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../../../../aarch64-apple-darwin22/include"
ignoring duplicate directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/local/include"
ignoring duplicate directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include-fixed"
ignoring nonexistent directory "/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/../../../../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../../../../aarch64-apple-darwin22/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /opt/homebrew/Cellar/ncurses/6.4/include/ncursesw
 /opt/homebrew/Cellar/ncurses/6.4/include
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/include-fixed
 /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks
End of search list.
Compiler executable checksum: 1ed03ec2fbe7f047297ce1fbd4c59f18
COLLECT_GCC_OPTIONS='-o' 'test.out' '-D' '_DARWIN_C_SOURCE' '-D' 'NCURSES_WIDECHAR' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include/ncursesw' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include' '-L/opt/homebrew/Cellar/ncurses/6.4/lib' '-v' '-mmacosx-version-min=13.0.0'  '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out-'
 as -arch arm64 -v -I /opt/homebrew/Cellar/ncurses/6.4/include/ncursesw -I /opt/homebrew/Cellar/ncurses/6.4/include -mmacosx-version-min=13.0 -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccwqyq07.o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//cchnwnwa.s
Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin22.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1as -triple arm64-apple-macosx13.0.0 -filetype obj -main-file-name cchnwnwa.s -target-cpu apple-m1 -target-feature +v8.5a -target-feature +crc -target-feature +lse -target-feature +rdm -target-feature +crypto -target-feature +dotprod -target-feature +fp-armv8 -target-feature +neon -target-feature +fp16fml -target-feature +ras -target-feature +rcpc -target-feature +zcm -target-feature +zcz -target-feature +fullfp16 -target-feature +sm4 -target-feature +sha3 -target-feature +sha2 -target-feature +aes -I /opt/homebrew/Cellar/ncurses/6.4/include/ncursesw -I /opt/homebrew/Cellar/ncurses/6.4/include -fdebug-compilation-dir=/Users/p1xelher0/code/github/p1xelHer0/rogue-gerbil -dwarf-debug-producer "Apple clang version 15.0.0 (clang-1500.1.0.2.5)" -I /opt/homebrew/Cellar/ncurses/6.4/include/ncursesw -I /opt/homebrew/Cellar/ncurses/6.4/include -dwarf-version=4 -mrelocation-model pic --mrelax-relocations -mllvm -disable-aligned-alloc-awareness=1 -o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccwqyq07.o /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//cchnwnwa.s
COMPILER_PATH=/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/
LIBRARY_PATH=/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/:/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../../
COLLECT_GCC_OPTIONS='-o' 'test.out' '-D' '_DARWIN_C_SOURCE' '-D' 'NCURSES_WIDECHAR' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include/ncursesw' '-I' '/opt/homebrew/Cellar/ncurses/6.4/include' '-L/opt/homebrew/Cellar/ncurses/6.4/lib' '-v' '-mmacosx-version-min=13.0.0'  '-nodefaultexport' '-mlittle-endian' '-mabi=lp64' '-dumpdir' 'test.out.'
 /opt/homebrew/Cellar/gcc/13.2.0/bin/../libexec/gcc/aarch64-apple-darwin22/13/collect2 -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/ -dynamic -arch arm64 -platform_version macos 13.0.0 0.0 -o test.out -L/opt/homebrew/Cellar/ncurses/6.4/lib -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13 -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc -L/opt/homebrew/Cellar/gcc/13.2.0/bin/../lib/gcc/current/gcc/aarch64-apple-darwin22/13/../../.. /var/folders/3z/4rtvbvk578g2byfj_r0r2flw0000gn/T//ccwqyq07.o -search_paths_first -lncursesw -lemutls_w -lgcc -lSystem -lgcc -no_compact_unwind -rpath @loader_path -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc/aarch64-apple-darwin22/13 -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current/gcc -rpath /opt/homebrew/Cellar/gcc/13.2.0/lib/gcc/current
ld: warning: ignoring duplicate libraries: '-lgcc'
  • Some things: I don't get the rpath thing nor what even stripping. Perhaps rpath is the missing part?
  • pkg-config now works on my machine to find the installed ncurses
  • I don't know about "building a Homebrew package"
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