https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #187 from Peter Bisroev <peter.bisroev at groundlabs dot com> --- (In reply to dave.anglin from comment #183) > On 2020-02-15 12:49 a.m., peter.bisroev at groundlabs dot com wrote: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577 > > > > --- Comment #180 from Peter Bisroev <peter.bisroev at groundlabs dot com> > > --- > > (In reply to dave.anglin from comment #177) > >> On 2020-02-13 6:01 p.m., peter.bisroev at groundlabs dot com wrote: > >>> I have tried playing around with weak using aCC, however even though it > >>> accepts > >>> both attribute and pragma (and complains if you misspell "weak"), both > >>> compiler > >>> and linker seem to ignore it. But I might have made some mistake there, > >>> will > >>> double check tonight. > >> Did you look at .s output? You could also test a simple program with a > >> weak > >> function > >> in two objects. > > Sorry Dave, not 100% sure what kind of test you are talking about. Something > > like this? > > ---------- > > // func0.cpp > > > > int func0(int) __attribute__((weak)); > > int func0(int arg) { > > return arg + 1; > > } > > > > // main.cpp > > > > int func0(int) __attribute__((weak)); > > int func0(int arg) { > > return arg + 10; > > } > > > > int main(int argc, char * argv[]) { > > return func0(argc); > > } > > ---------- > > > Yes. Does it link okay? Hi Dave, No it does not link, the error I get is "ld: Duplicate symbol "func0(int)" in files test0.o and func0.o". However it links perfectly fine when compiled with GCC. I have attached the results of the test above and another basic C++ one using an inline virtual method in attachment 47847. In there you will find three directories for results with aCC, gcc 4-7-4 and gcc 4.7.4 built with --enable-comdat. Additionally, in each directory you will find a build.log of how exactly was the test built, as well as *.objdump disassembly and other info and *.readelf dumps. I have not had a chance to look through these in great detail, will do this later today, but some things I've noticed (not sure how important they are yet): - aCC seems to use PCREL21BI relocations while GCC PCREL21B. - When objdumping C++ test1 for comdat enabled gcc, I get "objdump: test1 symbol number 48 references nonexistent SHT_SYMTAB_SHNDX section". Will come back to this a little later today. Thanks! --peter
