https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97687
Bug ID: 97687 Summary: -Wfatal-errors prints some notes but not others Product: gcc Version: 10.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: nick at ludocode dot com Target Milestone: --- In file a.c: #define FOO foo typedef int FOO; typedef short FOO; gcc a.c a.c:1:13: error: conflicting types for ‘foo’ 1 | #define FOO foo | ^~~ a.c:3:15: note: in expansion of macro ‘FOO’ 3 | typedef short FOO; | ^~~ a.c:1:13: note: previous declaration of ‘foo’ was here 1 | #define FOO foo | ^~~ a.c:2:13: note: in expansion of macro ‘FOO’ 2 | typedef int FOO; | ^~~ gcc -Wfatal-errors a.c a.c:1:13: error: conflicting types for ‘foo’ 1 | #define FOO foo | ^~~ a.c:3:15: note: in expansion of macro ‘FOO’ 3 | typedef short FOO; | ^~~ compilation terminated due to -Wfatal-errors. -Wfatal-errors is printing some notes but not others. It would be much more useful (to me) if it printed all of them, although in bugs #33952 and #37773 you claim that -Wfatal-errors is not for users, so I'm not really sure what you want it to do here. For what it's worth -fmax-errors=1 does the right thing and prints all three notes, which I assume is what you want me to use. Unfortunately -fmax-errors=1 isn't supported by Clang so this makes my build system more complicated. Clang supports -Wfatal-errors and prints all three notes. $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --with-isl --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-install-libiberty --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror gdc_include_dir=/usr/include/dlang/gdc Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.2.0 (GCC)