gimp-gap @2.6.0, gimp-gap-devel @2.7.0-20191012: error: implicit declaration of function

[p-bro]

After migrating from High Sierra to Catalina, gimp-gap-devel fails with an error in the build stage (full log attached).

/usr/bin/clang -DHAVE_CONFIG_H -I. -I.. -I.. -I../libwavplayclient -I../libgapbase -I../libgapvidapi -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarbal
ls_ports_graphics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_libs/ffmpeg -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macpor
ts.org_release_tarballs_ports_graphics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_libs/ffmpeg/libavcodec -I/opt/local/var/macports/build/_opt_local_v
ar_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_libs/ffmpeg/libavformat -I/opt/loca
l/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_li
bs/ffmpeg/libavutil -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a
5521131531c410bc87bad/extern_libs/ffmpeg/libavdevice  -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_gimp-gap-devel/gimp-gap-devel
/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_libs/ffmpeg/libswscale  -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graph
ics_gimp-gap-devel/gimp-gap-devel/work/gimp-gap-65c59cdce4073f34e8a5521131531c410bc87bad/extern_libs/ffmpeg/libavcore  -I/opt/local/include/SDL -D_GNU_SOURCE=1 -D_THREAD_SAFE -D_REENTRANT -I/opt/loc
al/include/gimp-2.0 -I/opt/local/include/gegl-0.4 -I/opt/local/include/gio-unix-2.0/ -I/opt/local/include/json-glib-1.0 -I/opt/local/include/babl-0.1 -I/opt/local/include/gtk-2.0 -I/opt/local/lib/gt
k-2.0/include -I/opt/local/include/pango-1.0 -I/opt/local/include/harfbuzz -I/opt/local/include/pango-1.0 -I/opt/local/include/fribidi -I/opt/local/include/cairo -I/opt/local/include/atk-1.0 -I/opt/
local/include/cairo -I/opt/local/include/pixman-1 -I/opt/local/include/ossp -I/opt/local/include/freetype2 -I/opt/local/include/libpng16 -I/opt/local/include/gimp-2.0 -I/opt/local/include/gdk-pixbuf
-2.0 -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include -DGAPLIBDIR=\""/opt/local/lib/gimp-gap-2.7"\" -DLOCALEDIR=\""/opt/local/share/locale"\" -I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk  -pipe -Os -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -arch x86_64 -Wall -fPIC -MT gap_detail_tracking_main.
o -MD -MP -MF .deps/gap_detail_tracking_main.Tpo -c -o gap_detail_tracking_main.o gap_detail_tracking_main.c
gap_detail_tracking_main.c:517:25: error: implicit declaration of function 'gap_lib_get_frame_nr_from_name' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
          frameNumber = gap_lib_get_frame_nr_from_name(imagename);

Failure happens on a newly upgraded macOS 10.15.7 19H15 with Xcode 12.2 12B45b.

[p-bro]

Build log gimp-gap-devel

[p-bro]

Following the discussion in #61261 on XCode 12 and throwing an error instead of a warning for implicit definitions, I downgraded Xcode to Xcode 11.7 11E801a, with unchanged results: still the same error as above.

[p-bro]

...but then downgrading command line tools to 11.5 (and selecting them with sudo xcode-select -s /Library/Developer/CommandLineTools/ ) actually worked. I'll leave the bug here, as this is not a sustainable solution.

[pietvo (Pieter van Oostrum)]

Adding configure.cflags-append -Wno-implicit-function-declaration to Portfile solves this for me (Xcode 12.4 on Catalina).

[cooljeanius (Eric Gallager)]

keywords bigsur catalina

[ryandesign (Ryan Carsten Schmidt)]

The problem also affects gimp-gap, and it is not related to the +quartz variant.

gimp-gap @2.6.0:

​https://build.macports.org/builders/ports-13_arm64-builder/builds/57088/steps/install-port/logs/stdio

gap_base.c:396:8: error: call to undeclared function 'gimp_help_enable_tooltips'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
       gimp_help_enable_tooltips ();
       ^
gap_base.c:400:8: error: call to undeclared function 'gimp_help_disable_tooltips'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
       gimp_help_disable_tooltips ();
       ^

gimp-gap-devel @2.7.0-20191012:

​https://build.macports.org/builders/ports-13_arm64-builder/builds/57089/steps/install-port/logs/stdio

gap_detail_tracking_main.c:517:25: error: call to undeclared function 'gap_lib_get_frame_nr_from_name'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
          frameNumber = gap_lib_get_frame_nr_from_name(imagename);
                        ^

Downgrading the error back to a warning or disabling it entirely is, of course, not the solution.

It looks like there have been no releases after 2.6.0, and there have been no code changes after 20191012 other than translation changes, and the project has been archived. Dave, it's been years since this bug was filed. Do you want to delete these ports or fix them?