在 OS X 上编译 PHP：iconv 仅在强制为 64 位时才有效

Question

我正在尝试编译 PHP，但在以下过程中一直出现此错误make：

Undefined symbols for architecture x86_64:
  "_iconv_open", referenced from:
      __php_iconv_mime_decode in iconv.o
      __php_iconv_strlen in iconv.o
      _php_iconv_string in iconv.o
      __php_iconv_strpos in iconv.o
      _zif_iconv_substr in iconv.o
      _zif_iconv_mime_encode in iconv.o
      _php_iconv_stream_filter_factory_create in iconv.o
      ...
  "_iconv_close", referenced from:
      __php_iconv_mime_decode in iconv.o
      __php_iconv_strlen in iconv.o
      _php_iconv_string in iconv.o
      __php_iconv_strpos in iconv.o
      _zif_iconv_substr in iconv.o
      _zif_iconv_mime_encode in iconv.o
      _php_iconv_stream_filter_dtor in iconv.o
      ...
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

./configurePHP的命令有指向 的 iconv 文件夹/opt/local，因此使用了 macport iconv 库（使用+universal标志安装）。这样做file，我得到：

/opt/local/lib/libiconv.dylib: Mach-O universal binary with 2 architectures
/opt/local/lib/libiconv.dylib (for architecture i386):  Mach-O dynamically linked shared library i386
/opt/local/lib/libiconv.dylib (for architecture x86_64):    Mach-O 64-bit dynamically linked shared library x86_64

我尝试然后手动安装 iconv 库，仅强制使用 64 位架构（我将其安装在 中/usr/local）并且它可以工作。的输出file是：

/usr/local/lib/libiconv.dylib: Mach-O 64-bit dynamically linked shared library x86_64

为什么会这样？我设法通过手动安装来构建和使 PHP 工作，但我不明白。

Answer 1

MacPorts iconv 库将符号重命名为_libiconv_open和_libiconv_close。这就是 PHP 找不到它们的原因，不是因为强制 64 位。运行nm /opt/local/lib/libiconv.dylibvs nm /usr/lib/libiconv.dylib（在 10.7.3 中）。