Future changes will treat some C front end warnings similar to
-Wnarrowing.
gcc/
* doc/invoke.texi (Warning Options): Mention C diagnostics
for -fpermissive.
gcc/c-family/
* c.opt (fpermissive): Enable for C and ObjC.
* c-opts.cc (c_common_post_options): Enable -fpermissive.
(snip)
Joseph, would you be able to review this?
There are no new tests because there are no permerrors yet.
Thanks,
Florian
---
v3: One operator per line, and use OPTION_SET_P.
gcc/c-family/c-opts.cc | 14 ++++++++++++++
gcc/c-family/c.opt | 2 +-
gcc/doc/invoke.texi | 8 ++++++--
3 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index 87da6c180cd..a7963646fbc 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -854,6 +854,20 @@ c_common_post_options (const char **pfilename)
&& flag_unsafe_math_optimizations == 0)
flag_fp_contract_mode = FP_CONTRACT_OFF;
+ /* C language modes before C99 enable -fpermissive by default, but
+ only if -pedantic-errors is not specified. Also treat
+ -fno-permissive as a subset of -pedantic-errors that does not
+ reject certain GNU extensions also present the defaults for later
+ language modes. */
+ if (!c_dialect_cxx ()
+ && !flag_isoc99
+ && !global_dc->m_pedantic_errors
+ && !OPTION_SET_P (flag_permissive))
+ {
+ flag_permissive = 1;
+ global_dc->m_permissive = 1;
+ }
+
/* If we are compiling C, and we are outside of a standards mode,
we can permit the new values from ISO/IEC TS 18661-3 for
FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 359f071e632..4984cd796f4 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -2116,7 +2116,7 @@ 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/doc/invoke.texi b/gcc/doc/invoke.texi
index 80bb1efac40..8527dbd1823 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -6174,13 +6174,17 @@ errors by @option{-pedantic-errors}. For instance:
Downgrade some required diagnostics about nonconformant code from
errors to warnings. Thus, using @option{-fpermissive} allows some
nonconforming code to compile. Some C++ diagnostics are controlled
-only by this flag, but it also downgrades some diagnostics that have
-their own flag:
+only by this flag, but it also downgrades some C and C++ diagnostics
+that have their own flag:
@gccoptlist{
-Wnarrowing @r{(C++)}
}
+The @option{-fpermissive} option is the default for historic C language
+modes (@option{-std=c89}, @option{-std=gnu89}, @option{-std=c90},
+@option{-std=gnu90}).
+
@opindex Wall
@opindex Wno-all
@item -Wall
base-commit: 7e3c58bfc1d957e48faf0752758da0fed811ed58
