[gtk-osx-users] Pango/break.c error: unannotated fall-through between switch labels.

[Pascal <p p14 orange fr>]

Hello,

I've upgraded to Xcode 12.
One good news is that Python comes in version 3.8.2.

But I've got an issue when compiling pango:

*** Configuring pango *** [22/32]
meson --prefix /usr/local/xnadalib-2020 --libdir lib  --wrap-mode=nofallback /usr/local/src-2020/pango-1.44.7
The Meson build system
Version: 0.55.0
Source dir: /usr/local/src-2020/pango-1.44.7
Build dir: /usr/local/src-2020/cache/jhbuild/build/pango-1.44.7
...
*** Building pango *** [22/32]
ninja  
[3/126] Compiling C object pango/libpango-1.0.0.dylib.p/break.c.o
FAILED: pango/libpango-1.0.0.dylib.p/break.c.o 
/Applications/Xcode.app/Contents/Developer/usr/bin/gcc -Ipango/libpango-1.0.0.dylib.p -Ipango 
-I../../../../pango-1.44.7/pango -I. -I../../../../pango-1.44.7 -I/usr/local/xnadalib-2020/include/glib-2.0 
-I/usr/local/xnadalib-2020/lib/glib-2.0/include -I/usr/local/xnadalib-2020/include/fribidi 
-I/usr/local/xnadalib-2020/include/harfbuzz -I/usr/local/xnadalib-2020/include/freetype2 
-I/usr/local/xnadalib-2020/include/libpng16 -I/usr/local/xnadalib-2020/include/cairo 
-I/usr/local/xnadalib-2020/include/pixman-1 
-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include 
-I/usr/local/xnadalib-2020/include -Xclang -fcolor-diagnostics -pipe -Wall -Winvalid-pch -std=gnu99 -O2 -g 
-D_POSIX_C_SOURCE=200809L -D_POSIX_THREAD_SAFE_FUNCTIONS -D_GNU_SOURCE -arch x86_64 -isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk 
-mmacosx-version-min=10.15 -g -O0 -ggdb3 -arch x86_64 -isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -g -O0 -ggdb3 
-Wimplicit-function-declaration -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs 
-Wold-style-definition -Wno-int-conversion -fno-strict-aliasing -Wpointer-arith -Wmissing-declarations 
-Wformat=2 -Wformat-nonliteral -Wformat-security -Wunused -Wcast-align -Wmissing-noreturn 
-Wmissing-format-attribute -Wmissing-include-dirs -Wno-uninitialized -Wno-shadow -Werror=implicit 
-Werror=implicit-fallthrough -Werror=nonnull -Werror=init-self -Werror=main -Werror=missing-braces 
-Werror=sequence-point -Werror=return-type -Werror=trigraphs -Werror=array-bounds -Werror=write-strings 
-Werror=address -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast -Werror=empty-body 
-Werror=write-strings -Wundef -Werror=redundant-decls -fvisibility=hidden -DPANGO_ENABLE_DEBUG 
'-DG_LOG_DOMAIN="Pango"' -DG_LOG_USE_STRUCTURED=1 -DPANGO_COMPILATION 
'-DSYSCONFDIR="/usr/local/xnadalib-2020/etc"' '-DLIBDIR="/usr/local/xnadalib-2020/lib"' -MD -MQ 
pango/libpango-1.0.0.dylib.p/break.c.o -MF pango/libpango-1.0.0.dylib.p/break.c.o.d -o 
pango/libpango-1.0.0.dylib.p/break.c.o -c ../../../../pango-1.44.7/pango/break.c
../../../../pango-1.44.7/pango/break.c:409:4: error: unannotated fall-through between switch labels 
[-Werror,-Wimplicit-fallthrough]
          case G_UNICODE_CONTROL:
          ^
../../../../pango-1.44.7/pango/break.c:409:4: note: insert '__attribute__((fallthrough));' to silence this 
warning
          case G_UNICODE_CONTROL:
          ^
          __attribute__((fallthrough)); 
../../../../pango-1.44.7/pango/break.c:409:4: note: insert 'break;' to avoid fall-through
          case G_UNICODE_CONTROL:
          ^
          break; 
../../../../pango-1.44.7/pango/break.c:426:4: error: unannotated fall-through between switch labels 
[-Werror,-Wimplicit-fallthrough]
          case G_UNICODE_OTHER_LETTER:
          ^
../../../../pango-1.44.7/pango/break.c:426:4: note: insert '__attribute__((fallthrough));' to silence this 
warning
          case G_UNICODE_OTHER_LETTER:
          ^
          __attribute__((fallthrough)); 
../../../../pango-1.44.7/pango/break.c:426:4: note: insert 'break;' to avoid fall-through
          case G_UNICODE_OTHER_LETTER:
          ^
          break; 
../../../../pango-1.44.7/pango/break.c:598:3: error: unannotated fall-through between switch labels 
[-Werror,-Wimplicit-fallthrough]
                case G_UNICODE_LINE_SEPARATOR:
                ^
../../../../pango-1.44.7/pango/break.c:598:3: note: insert '__attribute__((fallthrough));' to silence this 
warning
                case G_UNICODE_LINE_SEPARATOR:
                ^
                __attribute__((fallthrough)); 
../../../../pango-1.44.7/pango/break.c:598:3: note: insert 'break;' to avoid fall-through
                case G_UNICODE_LINE_SEPARATOR:
                ^
                break; 
3 errors generated.
[8/126] Generating pango-enum-types.c with a meson_exe.py custom command
ninja: build stopped: subcommand failed.
*** Error during phase build of pango: ########## Error running ninja   *** [22/32]

Is it really related to Xcode update?

Thanks, Pascal.
https://blady.pagesperso-orange.fr