Objective c Xcode警告：无法打开OSO文件

我将我的Xcode项目中的ffmpeg动态库升级到了一个新版本，现在当我运行我的应用程序时，我在Xcode控制台窗口中得到了所有这些警告。知道我为什么要买这些吗

提前谢谢

这是一个缩写版本，但你会明白的

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

---

当我看到这一点时，我经常发现clean and rebuild会修复警告。

我已经容忍gdb中的这种“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）是可行的，但我想知道更多

基本（众所周知的？）背景信息：在构建过程中生成“o”文件和“dylib”文件。“o”文件包含调试信息。但是，当链接器链接“o”文件以创建“动态库”时，该调试信息不会放入结果动态库中

警告宣布“o”文件上的时间戳比“dylib”上的时间戳更新。实际上，这种区别非常重要，警告将“o”文件的时间与动态库中的时间戳进行比较。您可以使用以下命令在动态库中查看与OSO相关的时间戳：

bash_提示符$nm-ap libavcodec.dylib | grep OSO
00000000 560D913F-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/4xm.o
00000000 560D913F-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/8bps.o
00000000 560D913E-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/8svx.o
00000000 560D913E-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/a64multienc.o
00000000 560D9140-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/aac_parser.o
00000000 560D9141-03 0001 OSO/Downloads/ffmpeg-0.8.5/libavcodec/aaccorder.o

请注意：第一列中的十六进制值是时间戳

GDB（调试器）在动态库中记录的路径上查找o文件，然后GDB检查时间戳

此时间戳检查功能最明显的用例如下所示：

您的产品（比方说，您公司的“旗舰应用程序”）在应用程序包中附带了一些第三方动态库（如ffmpeg动态库）

在GDB下启动应用程序，应用程序将加载第三方动态库

哎呀！您的应用程序包包含过期的

第三方.dylib

。实际上，您昨天构建了一个新的

第三方.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\u party/other\u文件夹

”中，您忘记将最新的

third\u party.dylib

复制到应用程序包中

假设

第三方.dylib

始终构建在同一个（project external）目录中，那么这些时间戳检查是提醒您注意上述“Oops！”的一种方法。您过期的

third\u party.dylib

（应用程序包中的副本）的“OSO”条目指向“

~/third\u/other\u folder/someclass.o

”，但调试器提醒您“

~/third\u party/other\u folder/someclass.o

”最近已重新编译，您似乎没有使用与最新编译对应的动态库

有趣的琐事：错误显示“比可执行时间戳更近”[重点是我的]——但这并不总是正确的！如果时间戳比dylib OSO条目预期的时间戳新或旧，则会出现错误。当严格的时间戳相等测试失败时，会出现此错误。在此处查看相关的gdb源代码：

最后注意：要实际解决“无法打开OSO”错误，请返回到

如何中和“无法打开OSO”并强制加载“o”：

---

免责声明：您不应该这样做：）

---

，错误消息告诉您调试信息是动态库的错误信息

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

对于下面的示例代码，我假设一个名为

abcdefg.o

的o文件和一个名为

lib_jklmnop.dylib

---

第一步。运行以下命令：

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：您必须找到一个包含“abcdefg.o”的输出行。我们正在修复一个文件的OSO警告：abcdefg.o，因此如果您不使用与该文件对应的时间戳，那么下面的步骤就没有意义了

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

echo导入日期时间\；t=datetime.datetime.fromtimestamp\（0x560D902C\）\；打印\（t.strftime \（\'%Y%m%d%H%m.%S\'）\）\（python3

（这一步可以使用perl或其他工具。Python似乎是可访问和可移植的，用于演示目的。）上面将使用“0x560D902C”并生成格式化的时间戳：201510011257.32

第三步。使用从第2步获得的格式化时间戳，运行

touch

命令更改abcdefg.o上的时间戳：

touch-t 201510011257.32 abcdefg.o

现在，“o”上的时间戳与动态库中的OSO条目匹配。GDB将加载这个“o”文件

（面向后代：在Mac OS X 10.8.5上测试，GNU gdb 6.3.50-20050815苹果版gdb-1824）

建议阅读：

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看起来我只有在ffmpeg源上运行“make clean”时才会收到此消息