nghttp2: fails to build with non-standard xcode path

[lkraider (Paul Eipper)]

The build works up to a point, then fails trying to locate Xcode in another (hardcoded?) path:

:info:build libtool: link: /usr/bin/clang -pipe -Os -isysroot/Users/paul/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -arch x86_64 -Wl,-headerpad_max_install_names -Wl,-syslibroot -Wl,/Users/paul/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -arch x86_64 -o .libs/libevent-server libevent-server.o -pthread  -L/opt/local/lib ../lib/.libs/libnghttp2.dylib ../third-party/.libs/liburl-parser.a -levent -levent_openssl -lcrypto -lssl -ldl -pthread
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_www_nghttp2/nghttp2/work/nghttp2-1.39.1/examples'
:info:build Making all in python
:info:build make[2]: Entering directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_www_nghttp2/nghttp2/work/nghttp2-1.39.1/python'
:info:build /opt/local/bin/python2.7 setup.py build
:info:build running build
:info:build running build_ext
:info:build building 'nghttp2' extension
:info:build /usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -pipe -Os -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I../lib -I../lib/includes -I../lib/includes -I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c nghttp2.c -o build/temp.macosx-10.14-x86_64-2.7/nghttp2.o
:info:build clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk' [-Wmissing-sysroot]
:info:build In file included from nghttp2.c:4:
:info:build /opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:33:10: fatal error: 'stdio.h' file not found
:info:build #include <stdio.h>
:info:build          ^~~~~~~~~
:info:build 1 error generated.
:info:build error: command '/usr/bin/clang' failed with exit status 1

Correct Xcode path is: $ xcode-select -p /Users/paul/Applications/Xcode.app/Contents/Developer

Build fails trying to access: /Applications/Xcode.app/Contents/Developer

[lkraider (Paul Eipper)]

build log

[Schamschula (Marius Schamschula)]

I wonder how many users install Xcode in /Users/*/Applications.

There is nothing in the nghttp2 Portfile that provides a path to Xcode. That said, it seems that in this case MacPorts python somehow sets sysroot to "". I think CMAKE_SYSROOT needs to be set.

However, there is no standard way to determine the path to Xcode.

[lkraider (Paul Eipper)]

Shouldn't xcode-select be used for that? It seems to be required to be set when running xcode tools in the terminal.

[ronan-gloo (Ronan)]

Using version 10.14.6 here with standard installation path, i symlinked the sdk to its expected versioned name by nghttp2 to get it built:

sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk

Guess the port is not expecting the SDK to the right place maybe.

[Schamschula (Marius Schamschula)]

Replying to ronan-gloo:

Using version 10.14.6 here with standard installation path, i symlinked the sdk to its expected versioned name by nghttp2 to get it built:

sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk

Guess the port is not expecting the SDK to the right place maybe.

See comment 1.

I'm assuming you are using Xcode 11.x. Therefore, you are likely going to run into this problem in other ports until MacPorts has a general solution. I'm still using Xcode 10.3 under Mojave, and see no such issue.