panic.c not building if PICO_PANIC_FUNCTION defined

[Memotech-Bill]

My build defines PICO_PANIC_FUNCTION=sys_panic. With that definition, building panic.c fails.

[ 27%] Building C object CMakeFiles/bbcbasic.dir/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c.obj
/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c: In function 'panic':
/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c:34:5: warning: implicit declaration of function 'pico_default_asm' [-Wimplicit-function-declaration]
     pico_default_asm (
     ^~~~~~~~~~~~~~~~
/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c:45:26: error: expected ')' before ':' token
             "push {lr}\n"
                          ^
                          )
/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c:53:9:
         :
         ~                 
make[3]: *** [CMakeFiles/bbcbasic.dir/build.make:399: CMakeFiles/bbcbasic.dir/home/pi/pico/pico-sdk/src/rp2_common/pico_platform_panic/panic.c.obj] Error 1

This is on a fully updated copy of Bullseye. Compiler version:

pi@raspberrypi:~/pico/PicoBB/console/pico_w/build $ /usr/bin/arm-none-eabi-gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/arm-none-eabi-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-none-eabi/8.3.1/lto-wrapper
Target: arm-none-eabi
Configured with: ../configure --build=arm-linux-gnueabihf --prefix=/usr --includedir='/usr/lib/include' --mandir='/usr/lib/share/man' --infodir='/usr/lib/share/info' --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir='/usr/lib/lib/arm-linux-gnueabihf' --libexecdir='/usr/lib/lib/arm-linux-gnueabihf' --disable-maintainer-mode --disable-dependency-tracking --mandir=/usr/share/man --enable-languages=c,c++,lto --enable-multilib --disable-decimal-float --disable-libffi --disable-libgomp --disable-libmudflap --disable-libquadmath --disable-libssp --disable-libstdcxx-pch --disable-nls --disable-shared --disable-threads --enable-tls --build=arm-linux-gnueabihf --target=arm-none-eabi --with-system-zlib --with-gnu-as --with-gnu-ld --with-pkgversion=15:8-2019-q3-1+b1 --without-included-gettext --prefix=/usr/lib --infodir=/usr/share/doc/gcc-arm-none-eabi/info --htmldir=/usr/share/doc/gcc-arm-none-eabi/html --pdfdir=/usr/share/doc/gcc-arm-none-eabi/pdf --bindir=/usr/bin --libexecdir=/usr/lib --libdir=/usr/lib --disable-libstdc++-v3 --host=arm-linux-gnueabihf --with-headers=no --without-newlib --with-multilib-list=rmprofile CFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' CPPFLAGS='-Wdate-time -D_FORTIFY_SOURCE=2' CXXFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' FCFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' FFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' GCJFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' LDFLAGS=-Wl,-z,relro OBJCFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' OBJCXXFLAGS='-g -O2 -fdebug-prefix-map=/build/gcc-arm-none-eabi-3BFy9A/gcc-arm-none-eabi-8-2019-q3=. -fstack-protector-strong' INHIBIT_LIBC_CFLAGS=-DUSE_TM_CLONE_REGISTRY=0 AR_FOR_TARGET=arm-none-eabi-ar AS_FOR_TARGET=arm-none-eabi-as LD_FOR_TARGET=arm-none-eabi-ld NM_FOR_TARGET=arm-none-eabi-nm OBJDUMP_FOR_TARGET=arm-none-eabi-objdump RANLIB_FOR_TARGET=arm-none-eabi-ranlib READELF_FOR_TARGET=arm-none-eabi-readelf STRIP_FOR_TARGET=arm-none-eabi-strip
Thread model: single
gcc version 8.3.1 20190703 (release) [gcc-8-branch revision 273027] (15:8-2019-q3-1+b1) 

[Memotech-Bill]

Found the problem.

The source file panic.c is missing:

#include "pico/platform/compiler.h"

As a result, the following definition is missing:

#define pico_default_asm(...) __asm (".syntax unified\n" __VA_ARGS__)

So the compiler thinks pico_default_asm() is a standard C function call, and the colons are a syntax error.

I just need work out how to fix that in my build until the SDK gets fixed.

[Memotech-Bill]

Messy, but adding the following line to my CMakeLists.txt file works around the issue for now:

  target_compile_options(${PROJECT_NAME} PUBLIC -include pico/platform/compiler.h)

[kilograham]

Ah, good spot, only happens with PICO_PANIC_FUNCTION defined which is how we missed it