Re: [PATCH] c: Avoid -Wenum-int-mismatch warning for redeclaration of builtin acc_on_device [PR107041]
On Thu, Apr 20, 2023 at 07:24:29PM +0200, Jakub Jelinek wrote: > On Thu, Apr 20, 2023 at 12:48:57PM -0400, Marek Polacek wrote: > > > - else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL) > > > + else if (enum_and_int_p > > > +&& TREE_CODE (newdecl) != TYPE_DECL > > > +/* Don't warn about about acc_on_device builtin redeclaration, > > > > "built-in" > > > > > + the builtin is declared with int rather than enum because > > > > "built-in" > > Changing. > > > > > + the enum isn't intrinsic. */ > > > +&& !(TREE_CODE (olddecl) == FUNCTION_DECL > > > + && fndecl_built_in_p (olddecl, BUILT_IN_ACC_ON_DEVICE) > > > + && !C_DECL_DECLARED_BUILTIN (olddecl))) > > > > What do you think about adding an (UN)LIKELY here? This seems a rather > > very special case. On the other hand we're not on a hot path here so it > > hardly matters. > > If anything, I'd add it either as UNLIKELY (enum_and_int_p) because that > whole thing is unlikely, Might could as well. > or add UNLIKELY (flag_openacc) && before this > acc_on_device stuff (but then users of -fopenacc might complain that it is > likely for them). Ok. Marek
Re: [PATCH] c: Avoid -Wenum-int-mismatch warning for redeclaration of builtin acc_on_device [PR107041]
On Thu, Apr 20, 2023 at 12:48:57PM -0400, Marek Polacek wrote: > > - else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL) > > + else if (enum_and_int_p > > + && TREE_CODE (newdecl) != TYPE_DECL > > + /* Don't warn about about acc_on_device builtin redeclaration, > > "built-in" > > > + the builtin is declared with int rather than enum because > > "built-in" Changing. > > > + the enum isn't intrinsic. */ > > + && !(TREE_CODE (olddecl) == FUNCTION_DECL > > + && fndecl_built_in_p (olddecl, BUILT_IN_ACC_ON_DEVICE) > > + && !C_DECL_DECLARED_BUILTIN (olddecl))) > > What do you think about adding an (UN)LIKELY here? This seems a rather > very special case. On the other hand we're not on a hot path here so it > hardly matters. If anything, I'd add it either as UNLIKELY (enum_and_int_p) because that whole thing is unlikely, or add UNLIKELY (flag_openacc) && before this acc_on_device stuff (but then users of -fopenacc might complain that it is likely for them). Jakub
Re: [PATCH] c: Avoid -Wenum-int-mismatch warning for redeclaration of builtin acc_on_device [PR107041]
On Wed, Apr 19, 2023 at 11:02:53AM +0200, Jakub Jelinek wrote: > Hi! > > The new -Wenum-int-mismatch warning triggers with -Wsystem-headers in > , for obvious reasons the builtin acc_on_device uses int > type argument rather than enum which isn't defined yet when the builtin > is created, while the OpenACC spec requires it to have acc_device_t > enum argument. The header makes sure it has int underlying type by using > negative and __INT_MAX__ enumerators. > > I've tried to make the builtin typegeneric or just varargs, but that > changes behavior e.g. when one calls it with some C++ class which has > cast operator to acc_device_t, so the following patch instead disables > the warning for this builtin. > > Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk > and 13.2? > > 2023-04-19 Jakub Jelinek > > PR c/107041 > * c-decl.cc (diagnose_mismatched_decls): Avoid -Wenum-int-mismatch > warning on acc_on_device declaration. > > * gcc.dg/goacc/pr107041.c: New test. > > --- gcc/c/c-decl.cc.jj2023-03-10 10:10:17.918387120 +0100 > +++ gcc/c/c-decl.cc 2023-04-18 10:29:33.340793562 +0200 > @@ -2219,7 +2219,14 @@ diagnose_mismatched_decls (tree newdecl, > } >/* Warn about enum/integer type mismatches. They are compatible types > (C2X 6.7.2.2/5), but may pose portability problems. */ > - else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL) > + else if (enum_and_int_p > +&& TREE_CODE (newdecl) != TYPE_DECL > +/* Don't warn about about acc_on_device builtin redeclaration, "built-in" > + the builtin is declared with int rather than enum because "built-in" > + the enum isn't intrinsic. */ > +&& !(TREE_CODE (olddecl) == FUNCTION_DECL > + && fndecl_built_in_p (olddecl, BUILT_IN_ACC_ON_DEVICE) > + && !C_DECL_DECLARED_BUILTIN (olddecl))) What do you think about adding an (UN)LIKELY here? This seems a rather very special case. On the other hand we're not on a hot path here so it hardly matters. OK either way, thanks. > warned = warning_at (DECL_SOURCE_LOCATION (newdecl), >OPT_Wenum_int_mismatch, >"conflicting types for %q+D due to enum/integer " > --- gcc/testsuite/gcc.dg/goacc/pr107041.c.jj 2023-04-18 10:18:07.039754258 > +0200 > +++ gcc/testsuite/gcc.dg/goacc/pr107041.c 2023-04-18 10:17:21.252418797 > +0200 > @@ -0,0 +1,23 @@ > +/* PR c/107041 */ > +/* { dg-do compile } */ > +/* { dg-additional-options "-Wenum-int-mismatch" } */ > + > +typedef enum acc_device_t { > + acc_device_current = -1, > + acc_device_none = 0, > + acc_device_default = 1, > + acc_device_host = 2, > + acc_device_not_host = 4, > + acc_device_nvidia = 5, > + acc_device_radeon = 8, > + _ACC_highest = __INT_MAX__ > +} acc_device_t; > + > +int acc_on_device (acc_device_t);/* { dg-bogus "conflicting > types for 'acc_on_device' due to enum/integer mismatch; have > 'int\\\(acc_device_t\\\)'" } */ > +int acc_on_device (acc_device_t); > + > +int > +foo (void) > +{ > + return acc_on_device (acc_device_host); > +} > > Jakub > Marek
[PATCH] c: Avoid -Wenum-int-mismatch warning for redeclaration of builtin acc_on_device [PR107041]
Hi! The new -Wenum-int-mismatch warning triggers with -Wsystem-headers in , for obvious reasons the builtin acc_on_device uses int type argument rather than enum which isn't defined yet when the builtin is created, while the OpenACC spec requires it to have acc_device_t enum argument. The header makes sure it has int underlying type by using negative and __INT_MAX__ enumerators. I've tried to make the builtin typegeneric or just varargs, but that changes behavior e.g. when one calls it with some C++ class which has cast operator to acc_device_t, so the following patch instead disables the warning for this builtin. Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk and 13.2? 2023-04-19 Jakub Jelinek PR c/107041 * c-decl.cc (diagnose_mismatched_decls): Avoid -Wenum-int-mismatch warning on acc_on_device declaration. * gcc.dg/goacc/pr107041.c: New test. --- gcc/c/c-decl.cc.jj 2023-03-10 10:10:17.918387120 +0100 +++ gcc/c/c-decl.cc 2023-04-18 10:29:33.340793562 +0200 @@ -2219,7 +2219,14 @@ diagnose_mismatched_decls (tree newdecl, } /* Warn about enum/integer type mismatches. They are compatible types (C2X 6.7.2.2/5), but may pose portability problems. */ - else if (enum_and_int_p && TREE_CODE (newdecl) != TYPE_DECL) + else if (enum_and_int_p + && TREE_CODE (newdecl) != TYPE_DECL + /* Don't warn about about acc_on_device builtin redeclaration, + the builtin is declared with int rather than enum because + the enum isn't intrinsic. */ + && !(TREE_CODE (olddecl) == FUNCTION_DECL + && fndecl_built_in_p (olddecl, BUILT_IN_ACC_ON_DEVICE) + && !C_DECL_DECLARED_BUILTIN (olddecl))) warned = warning_at (DECL_SOURCE_LOCATION (newdecl), OPT_Wenum_int_mismatch, "conflicting types for %q+D due to enum/integer " --- gcc/testsuite/gcc.dg/goacc/pr107041.c.jj2023-04-18 10:18:07.039754258 +0200 +++ gcc/testsuite/gcc.dg/goacc/pr107041.c 2023-04-18 10:17:21.252418797 +0200 @@ -0,0 +1,23 @@ +/* PR c/107041 */ +/* { dg-do compile } */ +/* { dg-additional-options "-Wenum-int-mismatch" } */ + +typedef enum acc_device_t { + acc_device_current = -1, + acc_device_none = 0, + acc_device_default = 1, + acc_device_host = 2, + acc_device_not_host = 4, + acc_device_nvidia = 5, + acc_device_radeon = 8, + _ACC_highest = __INT_MAX__ +} acc_device_t; + +int acc_on_device (acc_device_t); /* { dg-bogus "conflicting types for 'acc_on_device' due to enum/integer mismatch; have 'int\\\(acc_device_t\\\)'" } */ +int acc_on_device (acc_device_t); + +int +foo (void) +{ + return acc_on_device (acc_device_host); +} Jakub