xemacs @21.4.22: *** PANIC *** Configure tests are not working - compiler is broken.

[ryandesign (Ryan Schmidt)]

xemacs fails to build for me on 10.13 when I add -Werror=implicit-function-declaration to configure.cflags. I have done this in order to simulate what happens by default with Xcode 12. The error is:

checking size of short... 0
*** PANIC *** Configure tests are not working - compiler is broken.
*** PANIC *** Please examine config.log for compilation errors.

The config.log shows this is happening because a few configure tests have neglected to include the required headers:

config.log-configure:3593: checking for ANSI C header files
config.log-configure:3604: ccache /usr/bin/clang -E -I/opt/local/include -I/opt/local/include  -I/opt/local/include     conftest.c >/dev/null 2>conftest.out
config.log-configure:3668: ccache /usr/bin/clang -o conftest -pipe -Os -Werror=implicit-function-declaration -std=gnu89 -arch x86_64 -I/opt/local/include  -I/opt/local/include      -L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-no_pie -Xlinker -arch -Xlinker x86_64  -L/opt/local/lib     conftest.c           1>&5
config.log:configure:3663:67: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
config.log-if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
config.log-                                                                  ^
config.log-configure:3663:67: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
config.log-1 error generated.

config.log-configure:4511: checking size of short
config.log-configure:4525: ccache /usr/bin/clang -o conftest -pipe -Os -Werror=implicit-function-declaration -std=gnu89 -arch x86_64 -I/opt/local/include  -I/opt/local/include      -L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-no_pie -Xlinker -arch -Xlinker x86_64  -L/opt/local/lib     conftest.c           1>&5
config.log:configure:4519:11: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
config.log-  if (!f) exit(1);
config.log-          ^
config.log-configure:4519:11: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'
config.log-configure:4520:22: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
config.log-  fprintf(f, "%d\n", sizeof(short));
config.log-              ~~     ^~~~~~~~~~~~~
config.log-              %lu
config.log-1 warning and 1 error generated.

[ryandesign (Ryan Schmidt)]

Has duplicates #61521 and #62090.

[jdw13]

There is no pre-compiled version for 11_arm64, but install fails with configure tests, too, and I see similar issue when trying to do a source install with MacOS 11.2.1 using Mac mini (M1,2020) and Xcode 12.4 (all latest as far as I can tell):

:info:configure checking size of short... 0
:info:configure *** PANIC *** Configure tests are not working - compiler is broken.
:info:configure *** PANIC *** Please examine config.log for compilation errors.
:info:configure Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/work/xemacs-21.4.22" && ./configure --prefix=/opt/local --mandir=/opt/local/share/man --without-postgresql --without-ldap --with-sound=none --pdump --site-prefixes=/opt/local --with-tty --with-dialogs=athena --with-widgets=athena --with-athena=3d --with-database=gdbm --with-mule 
:info:configure Exit code: 1
:error:configure Failed to configure xemacs, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/work/xemacs-21.4.22/config.log
:error:configure Failed to configure xemacs: configure failure: command execution failed
:debug:configure Error code: NONE
:debug:configure Backtrace: configure failure: command execution failed
:debug:configure     while executing
:debug:configure "$procedure $targetname"
:error:configure See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_xemacs/xemacs/main.log for details.
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