如何解决“未定义的符号init_xrpow_core_sse”链接蹩脚的MP3编码器到iOS应用程序?
问题描述:
基于How can I compile lame as static library...?,我已经用在MacBook Pro上这个脚本编译跛脚:如何解决“未定义的符号init_xrpow_core_sse”链接蹩脚的MP3编码器到iOS应用程序?
mkdir -p build
rm -rf build/* #*/
function build_lame()
{
make distclean
./configure \
CFLAGS="-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/${SDK}.platform/Developer/SDKs/$SDK$SDK_VERSION.sdk" \
CC="/Applications/Xcode.app/Contents/Developer/usr/bin/gcc -arch $PLATFORM -miphoneos-version-min=7.0" \
--prefix="/Users/$USER/Desktop/$PROJECTNAME" \
--host="arm-apple-darwin9" \
--disable-shared \
--enable-static \
--disable-frontend \
make
cp "$PROJECTNAME/.libs/$PROJECTNAME.a" "build/$PROJECTNAME-$PLATFORM.a"
}
PROJECTNAME=libmp3lame
SDK_VERSION=7.0
SDK="iPhoneSimulator"
PLATFORM="i386"
build_lame
SDK="iPhoneOS"
PLATFORM="armv7"
build_lame
SDK="iPhoneOS"
PLATFORM="armv7s"
build_lame
lipo -create build/$PROJECTNAME-* -output build/$PROJECTNAME.a
然后我加入生成libmp3lame.a
到iPhone项目在Xcode 5.0.2。当为iOS设备构建时,它工作正常。我的问题在为模拟器构建时开始。当这样做,我得到以下链接器错误:
Undefined symbols for architecture i386:
"_init_xrpow_core_sse", referenced from:
_init_xrpow_core_init in libmp3lame.a(quantize.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
为什么会发生此错误,以及如何解决它?
下面是quantize.c
代码段从跛脚库:
static void
init_xrpow_core_c(gr_info * const cod_info, FLOAT xrpow[576], int upper, FLOAT * sum)
{
// here, the initialization of xrpow is done in normal c code (i've cut that out to keep it small)
}
void
init_xrpow_core_init(lame_internal_flags * const gfc)
{
gfc->init_xrpow_core = init_xrpow_core_c;
#if defined(HAVE_XMMINTRIN_H)
if (gfc->CPU_features.SSE)
gfc->init_xrpow_core = init_xrpow_core_sse;
#endif
#ifndef HAVE_NASM
#ifdef MIN_ARCH_SSE
gfc->init_xrpow_core = init_xrpow_core_sse;
#endif
#endif
}
答
的问题是在--host
参数configure
。它需要根据要运行模拟器的机器进行更改。就我而言,这是一台从2009年中旬开始运行Mac OS X 10.8.5的MacBook Pro。
uname -a
报道:
Darwin <my computer name>.local 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64
所以我疯狂地猜到是--host
参数configure
此环境中,模拟器运行时,需要设置为i686-apple-darwin12.5.0
。猜测是对的。我的构建脚本现在看起来像这样:
mkdir -p build
rm -rf build/* #*/
function build_lame()
{
make distclean
./configure \
CFLAGS="-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/${SDK}.platform/Developer/SDKs/$SDK$SDK_VERSION.sdk" \
CC="/Applications/Xcode.app/Contents/Developer/usr/bin/gcc -arch $PLATFORM -miphoneos-version-min=7.0" \
--prefix="/Users/$USER/Desktop/$PROJECTNAME" \
--host="$HOST" \
--disable-shared \
--enable-static \
--disable-frontend \
make
cp "$PROJECTNAME/.libs/$PROJECTNAME.a" "build/$PROJECTNAME-$PLATFORM.a"
}
PROJECTNAME=libmp3lame
SDK_VERSION=7.0
SDK="iPhoneSimulator"
HOST="i686-apple-darwin12.5.0"
PLATFORM="i686"
build_lame
SDK="iPhoneOS"
HOST="arm-apple-darwin9"
PLATFORM="armv7"
build_lame
SDK="iPhoneOS"
HOST="arm-apple-darwin9"
PLATFORM="armv7s"
build_lame
lipo -create build/$PROJECTNAME-* -output build/$PROJECTNAME.a
这适用于在Xcode中为Simulator构建模型时。