libgcc7 @7.5.0: build failure on macOS 11

[YuncongMa (Yuncong Ma)]

Hi! I successfully installed MacPorts 2.6.4 in my Mac Pro 2019 with macOS Big Sur 11.1. I got errors when I tried "sudo port install gcc6". The error messages are as follows:

--->  Fetching archive for libgcc7
Warning: Your DNS servers incorrectly claim to know the address of nonexistent hosts. This may cause checksum mismatches for some ports. See this page for more information: <https://trac.macports.org/wiki/MisbehavingServers>
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://mse.uk.packages.macports.org/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://lil.fr.packages.macports.org/libgcc7
--->  Building libgcc7
Error: Failed to build libgcc7: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port gcc6 failed

[kencu (Ken)]

Welcome!

Regarding your connection issue, try opening this URL in a browser and see what happens <​https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7/>

If that works fine, try downloading a file from that url with curl and see what what happens

curl -O https://ywg.ca.packages.macports.org/mirror/macports/packages/libgcc7/libgcc7-7.5.0_0.darwin_19.x86_64.tbz2

The full details on how to debug this are here wiki:MisbehavingServers.

FYI -- gcc7/libgcc7 is quite old, and may not work / be able to be made to work on BigSur.

The current gcc flavour for you would be gcc10 -- will that work for you?

sudo port -v install gcc10

[ryandesign (Ryan Carsten Schmidt)]

Please attach the main.log file so that we can see what went wrong.

[jboydon (John Boydon)]

I have got same error:

:info:build libtool: link:  /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_p
orts_lang_gcc7/libgcc7/work/build/./gcc/xgcc -shared-libgcc -B/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macpor
ts.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/./gcc -nostdinc++ -L/opt/local/var/macports/build/_opt_local_var_mac
ports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src -L/
opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/b
uild/x86_64-apple-darwin20/libstdc++-v3/src/.libs -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/libsupc++/.libs -B/opt/local/x86_64-apple-darwin20/bin/ -B/opt/local/x86_64-apple-darwin20/lib/ -isystem /opt/local/x86_64-apple-darwin20/include -isystem /opt/local/x86_64-apple-darwin20/sys-include    -dynamiclib  -o .libs/libstdc++.6.dylib .libs/libstdc++.6.dylib-master.o  -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/libsupc++/.libs -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/build/x86_64-apple-darwin20/libstdc++-v3/src/.libs -lm  -Wl,-exported_symbols_list -Wl,libstdc++-symbols.explist   -install_name  /opt/local/lib/libgcc/libstdc++.6.dylib -compatibility_version 7 -current_version 7.24
:info:build xgcc: warning: couldn't understand version 11.1
:info:build ld: library not found for -lgcc_s.10.4
:info:build collect2: error: ld returned 1 exit status
:info:build make[6]: *** [libstdc++.la] Error 1

Full log attached.

[jboydon (John Boydon)]

gcc6

[clegra]

build error libgcc7 on MacOS Big Sur (~60 MB, 1.7 MB zipped)

[clegra]

I seem to experience the same build error of libgcc7. I followed the suggestion by Ken above to use gcc10 instead, of which installation went fine. However, although I first uninstalled all versions of libgcc7 beforehand, the libgcc7 build error resurfaced again during a routine "port upgrade outdated".

Above I have added a zipped version of the logfile for this build error.

Many thanks for all help and comments. I appreciate that very much.

--->  Computing dependencies for libgcc7
--->  Fetching archive for libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from http://fco.it.packages.macports.org/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://lil.fr.packages.macports.org/libgcc7
--->  Attempting to fetch libgcc7-7.5.0_0.darwin_20.x86_64.tbz2 from https://mse.uk.packages.macports.org/libgcc7
--->  Fetching distfiles for libgcc7
--->  Verifying checksums for libgcc7
--->  Extracting libgcc7
--->  Applying patches to libgcc7
--->  Configuring libgcc7
--->  Building libgcc7
Error: Failed to build libgcc7: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc7/libgcc7/main.log for details.
Error: Problem while installing libgcc7

[wealthychef1]

I also am unable to build pdftk due to this bug. See bug #62564.

[kencu (Ken)]

you should be using pdftk-java, not pdftk, on all newer systems.

We'll have to adjust the blockers and warnings so that happens.

gccj is not going to be made to work on BigSur; upstream gcc dropped it years ago.

[wealthychef1]

Thanks for the information! Yes, I agree that if the port is broken it should not be advertised as available. But when I posted this as a bug in pdftk it was called a duplicate. Haha oh well. I do appreciate the pointer.

Replying to kencu:

you should be using pdftk-java, not pdftk, on all newer systems.

We'll have to adjust the blockers and warnings so that happens.

gccj is not likely going to be made to work on BigSur; upstream gcc dropped it years ago.

[ken-cunningham-webuse]

In aad24861aa65e29ce3bb705dc91192206c6eb978/macports-ports (master):

pdftk: mark obsolete on newer systems

see: #61883

[wealthychef1]

Thanks for both marking that obsolete (I don't know how to suggest that) and also for suggesting pdftk-java, which works fine on Big Sur.