In the context of the recent discussion, it occurred to me that this semantic would be useful, but currently there is no easy way to access it. Bikeshedding welcome; the use of this flag is a bit odd, but it has the advantage of being accepted without error going back at least to 4.3.
-- 8< -- Currently there is no flag to use to upgrade all currently-enabled pedwarns from warning to error. -pedantic-errors also enables the -Wpedantic pedwarns, while -Werror=pedantic uselessly makes only the -Wpedantic pedwarns errors. I suggest that since -fpermissive lowers some diagnostics from error to warning, -fno-permissive could do the reverse. gcc/ChangeLog: * doc/invoke.texi: Document -fno-permissive. gcc/c-family/ChangeLog: * c.opt (fpermissive): Accept in C and ObjC as well. * c-opts.cc (c_common_post_options): -fno-permissive sets global_dc->pedantic_errors. --- gcc/doc/invoke.texi | 7 +++++++ gcc/c-family/c.opt | 2 +- gcc/c-family/c-opts.cc | 4 ++++ 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b92b8576027..6198df14382 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -3438,11 +3438,18 @@ issue. Currently, the only such diagnostic issued by G++ is the one for a name having multiple meanings within a class. @opindex fpermissive +@opindex fno-permissive @item -fpermissive Downgrade some diagnostics about nonconformant code from errors to warnings. Thus, using @option{-fpermissive} allows some nonconforming code to compile. +Conversely, @option{-fno-permissive} can be used to upgrade some +diagnostics about nonconformant code from warnings to errors. This +differs from @option{-pedantic-errors} in that the latter also implies +@option{-Wpedantic}; this option does not enable additional +diagnostics, only upgrades the severity of those that are enabled. + @opindex fno-pretty-templates @opindex fpretty-templates @item -fno-pretty-templates diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt index 3333cddeece..07165d2bbe8 100644 --- a/gcc/c-family/c.opt +++ b/gcc/c-family/c.opt @@ -2075,7 +2075,7 @@ C ObjC C++ ObjC++ Look for and use PCH files even when preprocessing. fpermissive -C++ ObjC++ Var(flag_permissive) +C ObjC C++ ObjC++ Var(flag_permissive) Downgrade conformance errors to warnings. fplan9-extensions diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc index c68a2a27469..1973c068d59 100644 --- a/gcc/c-family/c-opts.cc +++ b/gcc/c-family/c-opts.cc @@ -1021,6 +1021,10 @@ c_common_post_options (const char **pfilename) SET_OPTION_IF_UNSET (&global_options, &global_options_set, flag_delete_dead_exceptions, true); + if (!global_options_set.x_flag_pedantic_errors + && global_options_set.x_flag_permissive) + global_dc->pedantic_errors = !flag_permissive; + if (cxx_dialect >= cxx11) { /* If we're allowing C++0x constructs, don't warn about C++98 base-commit: 62c4d34ec005e95f000ffabd34da440dc62ac346 -- 2.31.1