Xcode 警告：无法打开 OSO 文件

Question

我将 Xcode 项目中的 ffmpeg dylibs 升级到了新版本，现在当我运行应用程序时，我会在 Xcode 控制台窗口中收到所有这些警告。有什么想法我为什么要得到这些吗？

提前致谢！

这是一个缩写版本，但您会明白的。

warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/4xm.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/4xm.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/8bps.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/8bps.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/8svx.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/8svx.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/a64multienc.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/a64multienc.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_ac3_parser.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_ac3_parser.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_adtstoasc_bsf.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_adtstoasc_bsf.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_parser.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aac_parser.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacadtsdec.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacadtsdec.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aaccoder.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aaccoder.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacdec.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacdec.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacenc.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacenc.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacps.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacps.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacpsy.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacpsy.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacsbr.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aacsbr.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aactab.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aactab.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aandcttab.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aandcttab.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aasc.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/aasc.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3_parser.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3_parser.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dec.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dec.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dec_data.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dec_data.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dsp.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3dsp.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_combined.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_combined.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_fixed.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_fixed.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_float.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3enc_float.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3tab.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/ac3tab.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/acelp_filters.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/acelp_filters.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib
warning: .o file "/Users/username/Downloads/ffmpeg-0.8.5/libavcodec/acelp_pitch_delay.o" more recent than executable timestamp in "/Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib"
warning: Could not open OSO file /Users/username/Downloads/ffmpeg-0.8.5/libavcodec/acelp_pitch_delay.o to scan for pubtypes for objfile /Users/username/Library/Developer/Xcode/DerivedData/MyApp-cjpuovfvlxckuddiuysbbosqgbsj/Build/Products/Debug/MyProject.framework/Versions/A/Libraries/libavcodec.dylib

Answer 1

如何消除“无法打开 OSO”并强制加载“o”：

---

免责声明：您不应该这样做:)

---

如前所述 ，错误消息告诉您您的 dylib 的调试信息不正确。

然而，如果出于某种奇异的原因，您认为您的“o”文件（尽管它们可能带有错误的时间戳而被污染）确实包含正确的信息，并且您需要将它们加载到 gdb 中，那么请继续...

对于下面的示例代码，我假设有一个名为 abcdefg.o 的 o 文件和一个名为 lib_jklmnop.dylib 的 dylib

---

第一步。 运行此命令：

nm -ap lib_jklmnop.dylib  | grep OSO | awk '{printf("%s %s\n", toupper($1), $0 )}'

输出应包含：

00000000560D902C 00000000560d902c - 03 0001   OSO /some/file/path/abcdefg.o

注意：你必须找到其中包含“abcdefg.o”的输出行。我们仅修复一个文件的 OSO 警告：abcdefg.o，因此，如果您不使用与该文件对应的时间戳，则以下步骤毫无意义。

第二步。获取第一列中的十六进制数（本例中为 560D902C），然后通过 python 运行它，如下所示：（

echo import datetime\; t=datetime.datetime.fromtimestamp\( 0x560D902C \) \; print \( t.strftime\(\'%Y%m%d%H%M.%S\'\) \) | python3

您可以使用 perl 或其他东西来执行此步骤。Python 似乎易于访问且可移植出于演示目的。）以上将采用“0x560D902C”并生成格式化时间戳：201510011257.32

第三步。使用从步骤 2 获取的格式化时间戳，运行 touch 命令来更改 abcdefg.o 上的时间戳：

touch -t 201510011257.32  abcdefg.o

现在“o”上的时间戳与 dylib 中的 OSO 条目匹配。 GDB 将加载这个“o”文件。

（对于后代：在 Mac OS X 10.8.5 上使用 GNU gdb 6.3.50-20050815 Apple 版本 gdb-1824 进行测试）

推荐阅读：

Apple DWARF 调试方案

Bugzilla@Mozilla - GDB 抱怨 .o 文件具有较新的时间戳比可执行文件

Answer 2

当我看到这个时，我经常发现清理和重建可以修复警告。

Answer 3

我已经忍受 gdb 中的“无法打开 OSO 文件”输出几个星期了。随意的谷歌搜索总是让我回到这里。

@kakyo 的答案（尝试重建）有效，但我想了解更多。

基本（众所周知？）背景信息：“o”文件和“dylib”文件都是在构建过程中生成的。 “o”文件包含调试信息。但是，当链接器链接“o”文件以创建“dylib”时，该调试信息不会放入生成的dylib中。

警告表明“o”文件上的时间戳比“dylib”上的时间戳更新。实际上，这种区别至关重要，警告将“o”文件的时间与 dylib 中的时间戳进行比较。您可以使用以下命令查看 dylib 中与 OSO 相关的时间戳：

bash_prompt$ nm -ap libavcodec.dylib  | grep OSO

00000000560d913f - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/4xm.o
00000000560d913f - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/8bps.o
00000000560d913e - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/8svx.o
00000000560d913e - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/a64multienc.o
00000000560d9140 - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/aac_parser.o
00000000560d9141 - 03 0001   OSO /Downloads/ffmpeg-0.8.5/libavcodec/aaccoder.o

请注意：第一列中的十六进制值是时间戳。

GDB（调试器）在dylib记录的路径下找到o文件，然后GDB检查时间戳。

这个时间戳检查功能最明显的用例似乎如下：

1. 您的产品（比如说您公司的“旗舰应用程序”）在您的应用程序包中附带了一些第三方 dylib（例如 ffmpeg dylibs）。
2. 您在 GDB 下启动您的应用程序，并且您的应用程序加载第三方 dylib。
3. 哎呀！您的应用程序包包含 third_party.dylib 的过时副本。您昨天实际上构建了一个新的 third_party.dylib （它生成了一个新的 dylib 和新的“o”文件）。这些新的第三方项目都在“~/third_party/other_folder”中，而您忘记将最新的 third_party.dylib 复制到您的应用程序包中。

假设 Third_party.dylib 始终构建在同一（项目外部）目录中，那么这些时间戳检查是提醒您“哎呀！”的一种方法。如上所述。您过时的 third_party.dylib 副本（应用程序包中的副本）包含指向“~/third_party/other_folder/someclass.o”的“OSO”条目，但调试器警告您“~/third_party/other_folder/someclass.o”最近已重新编译，并且您似乎没有使用与以下内容对应的 dylib最新编译。

有趣的琐事：错误显示“比可执行时间戳更新”[重点是我的] - 但这并不总是正确的！如果时间戳比 dylib OSO 条目期望的时间戳新或旧，就会出现该错误。当严格时间戳相等测试失败时会出现该错误。在这里查看相关的gdb源代码：

https://github.com/unofficial-opensource-apple/gdb/blob/ae8094e0d84d94fc0ad9b5ecdcd79acd722879f8/src/gdb/dbxread.c
http://www.opensource.apple。 com/source/gdb/gdb-952/src/gdb/dbxread.c

最后说明：要真正解决“无法打开 OSO”错误，请返回到@kakyo 原来的​​正确建议