[PATCH] gcov-profile: clarify profile-exclude-files documentation [PR96285]

["Göran Uddeborg" <goeran@uddeborg.se>]

The wording of the description of -fprofile-exclude-files is easy to
misunderstand.  One can be led to believe a file is excluded only if
it matches all of the patterns, not just one.  This patch tries to
clarify the function.  It also adjusts the wording of
-fprofile-filter-files accordingly.

2020-07-24  Göran Uddeborg  <goeran@uddeborg.se>

gcc/
	PR gcov-profile/96285
        * common.opt, doc/invoke.texi: Clarify wording of
        -fprofile-exclude-files and adjust -fprofile-filter-files to
        match.

diff --git a/gcc/common.opt b/gcc/common.opt
index a3893a4725e..1662cbfa92d 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2207,11 +2207,11 @@ Common Joined RejectNegative Enum(profile_update) Var(flag_profile_update) Init(
 
 fprofile-filter-files=
 Common Joined RejectNegative Var(flag_profile_filter_files)
-Instrument only functions from files where names match any regular expression (separated by a semi-colon).
+Instrument only functions from files whose name matches any of the regular expressions (separated by semi-colons).
 
 fprofile-exclude-files=
 Common Joined RejectNegative Var(flag_profile_exclude_files)
-Instrument only functions from files where names do not match all the regular expressions (separated by a semi-colon).
+Instrument only functions from files whose name does not match any of the regular expressions (separated by semi-colons).
 
 Enum
 Name(profile_reproducibility) Type(enum profile_reproducibility) UnknownError(unknown profile reproducibility method %qs)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index ba18e05fb1a..781fe72ca97 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -13842,20 +13842,20 @@ is present in the command line.
 @item -fprofile-filter-files=@var{regex}
 @opindex fprofile-filter-files
 
-Instrument only functions from files where names match
-any regular expression (separated by a semi-colon).
+Instrument only functions from files whose name matches
+any of the regular expressions (separated by semi-colons).
 
-For example, @option{-fprofile-filter-files=main.c;module.*.c} will instrument
+For example, @option{-fprofile-filter-files=main\.c;module.*\.c} will instrument
 only @file{main.c} and all C files starting with 'module'.
 
 @item -fprofile-exclude-files=@var{regex}
 @opindex fprofile-exclude-files
 
-Instrument only functions from files where names do not match
-all the regular expressions (separated by a semi-colon).
+Instrument only functions from files whose name does not match
+any of the regular expressions (separated by semi-colons).
 
-For example, @option{-fprofile-exclude-files=/usr/*} will prevent instrumentation
-of all files that are located in @file{/usr/} folder.
+For example, @option{-fprofile-exclude-files=/usr/.*} will prevent instrumentation
+of all files that are located in the @file{/usr/} folder.
 
 @item -fprofile-reproducible
 @opindex fprofile-reproducible