xcrun -sdk iphoneos clang is unable to create an executable file

[mrbrantofgithub]

Error information is shown below:
xcrun -sdk iphoneos clang is unable to create an executable file.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

[kewlbear]

As you can see in the message, I have to see config.log to figure out the reason.

[mrbrantofgithub]

@kewlbear Thank you for your reply. But I don't know where to find the "config.log" file.

[kewlbear]

You can do the following:

find -name config.log

[mrbrantofgithub]

Below is the last part of config.log. I have emailed the config.log file to ffmpeg-user@ffmpeg.org
My Xcode is version 9.2
"xcrun -sdk iphoneos clang -arch arm64 -mios-version-min=6.0 -fembed-bitcode -c -o /var/folders/3s/r_mvg2dd7hz5nyd5my5jztrh0000gp/T/ffconf.K8OIrHVS/test.o /var/folders/3s/r_mvg2dd7hz5nyd5my5jztrh0000gp/T/ffconf.K8OIrHVS/test.c
xcrun: error: SDK "iphoneos" cannot be located
xcrun -sdk iphoneos clang -arch arm64 -mios-version-min=6.0 -fembed-bitcode -o /var/folders/3s/r_mvg2dd7hz5nyd5my5jztrh0000gp/T/ffconf.K8OIrHVS/test /var/folders/3s/r_mvg2dd7hz5nyd5my5jztrh0000gp/T/ffconf.K8OIrHVS/test.o
xcrun: error: SDK "iphoneos" cannot be located
ld: warning: ignoring file /usr/lib/libSystem.dylib, missing required architecture arm64 in file /usr/lib/libSystem.dylib (2 slices)
ld: dynamic main executables must link with libSystem.dylib for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
C compiler test failed."

[kewlbear]

After googling “xcrun: error: SDK "iphoneos" cannot be located”, I’m guessing some reasons:

1. Did you rename Xcode.app?
2. Did you install command line tools?

[mrbrantofgithub]

I fixed “xcrun: error: SDK "iphoneos" cannot be located” by referring to "gomatcha/matcha#6"
with "sudo xcode-select --switch /Applications/Xcode.app"
Thank you for your help again.

[kewlbear]

Glad I could help.