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commit a33ad5c5681a0ce2dfba0a90b4043f399b7a7d55
Author: David Malcolm
Date: Thu Apr 4 12:37:01 2024 -0400
gcc-14: add 'Improvements to SARIF support' section
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index d782c334..934cd1ad 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -922,6 +922,28 @@ it emits:
+
+Improvements to SARIF support
+
+
+
+The SARIF output from
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-format";>-fdiagnostics-format=
+now adds indentation and newlines to reflect the logical JSON structure of
the data. The previous compact behavior can be restored via the new option
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fno-diagnostics-json-formatting";>-fno-diagnostics-json-formatting.
+This also applies to the older output format named "json".
+
+
+
+If profiling information about the compiler itself is requested via
+https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html#index-ftime-report";>-ftime-report,
+and a SARIF output format is requested via
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-format";>-fdiagnostics-format=,
+then the timing and memory usage data is now written in JSON form into
+the SARIF output, rather than as plain text to stderr.
+
+
+
Improvements for plugin authors
commit 00e45d6100ab1e8bb1c6f8e3a90ac6ba1281336d
Author: David Malcolm
Date: Thu Apr 4 12:37:01 2024 -0400
gcc-14: analyzer improvements
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 8b72bc20..d782c334 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -760,6 +760,168 @@ __asm (".global __flmap_lock" "\n\t"
+
+Improvements to Static Analyzer
+
+
+New warnings:
+
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-infinite-loop";>-Wanalyzer-infinite-loop
+ warns about paths through the code which appear to lead to an infinite
loop.
+
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-overlapping-buffers";>-Wanalyzer-overlapping-buffers
warns for paths through the code in which overlapping buffers are passed to an
API for which the behavior on such buffers is undefined.
+
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-undefined-behavior-strtok";>-Wanalyzer-undefined-behavior-strtok
+ warns for paths through the code in which a call is made to
+ strtok with undefined behavior.
+
+
+
+
+
+Previously, the analyzer's "taint" tracking to be explicitly enabled via
+https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-fanalyzer-checker";>-fanalyzer-checker=taint
+(along with
+https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-fanalyzer";>-fanalyzer).
+This is now enabled by default when
+https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-fanalyzer";>-fanalyzer
+is selected, thus also enabling the 6 taint-based warnings:
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-tainted-allocation-size";>-Wanalyzer-tainted-allocation-size
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-tainted-array-index";>-Wanalyzer-tainted-array-index
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html#index-Wanalyzer-tainted-assertion";>-Wanalyzer-tainted-assertion
+
+
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Ana
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commit ab5a071cd63d5eca2030cca01758337044644f45
Author: David Malcolm
Date: Tue Dec 3 16:16:46 2024 -0500
onlinedocs: add link to libgdiagnostics documentation
diff --git a/htdocs/onlinedocs/index.html b/htdocs/onlinedocs/index.html
index d3fa24c6..07e3de17 100644
--- a/htdocs/onlinedocs/index.html
+++ b/htdocs/onlinedocs/index.html
@@ -1855,6 +1855,7 @@ existing release.
href="https://gcc.gnu.org/onlinedocs/libquadmath-html.tar.gz";>an
HTML tarball)
https://gcc.gnu.org/onlinedocs/jit/";>libgccjit
documentation
+https://gcc.gnu.org/onlinedocs/libgdiagnostics/";>libgdiagnostics
documentation
https://gcc.gnu.org/onlinedocs/docs-sources.tar.gz";>Texinfo
sources of all the manuals
---
Summary of changes:
htdocs/onlinedocs/index.html | 1 +
1 file changed, 1 insertion(+)
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commit 801f3ad85b22a5da5114bfb47d74c94033806f24
Author: David Malcolm
Date: Wed Jan 15 14:08:24 2025 -0500
gcc-15/porting_to: c23-fn-decls-without-parameters
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 39598b93..c446e309 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -41,7 +41,69 @@ If your code relies on older versions of the C standard, you
will need to
either add https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=
to your build flags, or port your code to C23.
-
+C23 brings the following changes:
+
+Function declarations without
parameters
+
+ The meaning of function declarations of the form
+ rettype identifier ();
+ such as
+ char *strstr ();
+ changed in C23.
+
+
+ In C17 and earlier, such function declarators specified no information
+ about the number or types of the parameters of the function (C17 6.7.6.3),
+ requiring users to know the correct number of arguments, with each passed
+ argument going through default argument promotion.
+
+
+ In C23 such declarations mean (void) i.e. a function taking
+ no arguments, which can lead to build failures on code that relied on
+ the earlier meaning, such as in
+ https://godbolt.org/z/11hzWYEeK";>this example:
+
+
+#include
+
+void test()
+{
+ void (*handler)();
+ handler = signal(SIGQUIT, SIG_IGN);
+}
+
+: In function 'test':
+:6:11: error: assignment to 'void (*)(void)' from incompatible
pointer type '__sighandler_t' {aka 'void (*)(int)'}
[-Wincompatible-pointer-types]
+6 | handler = signal(SIGQUIT, SIG_IGN);
+ | ^
+In file included from :1:
+/usr/include/signal.h:72:16: note: '__sighandler_t' declared here
+ 72 | typedef void (*__sighandler_t) (int);
+ |^~
+
+
+ Code such as the above relying on a non-zero number of parameters (such
+ as a single int) can be fixed for C23 by adding the correct
+ parameters to the function declarator, such as via:
+
+
+ void (*handler)(int);
+
+
+ In other cases the code is simply missing a #include of
+ the correct header, such as with:
+
+ void *malloc();
+
+
+ These can be fixed by including the correct header and removing the
+ non-prototype declaration.
+
+
+ Alternatively you can use
+ https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=
+ to select an earlier version of the C standard.
+
New keywords
commit 4b61405659dbbfd9312e90e5bf6bfc224eabe3a4
Author: David Malcolm
Date: Wed Jan 15 14:53:57 2025 -0500
gcc-15/changes: add "C23 by default:" to
Tweak to help readability by adding a prefix to the
diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 98d85cf9..171c3db4 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -101,7 +101,8 @@ a work-in-progress.
C
- GCC 15 changes the default language version for C compilation from
+ C23 by default: GCC 15 changes the default language version
+for C compilation from
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu17
to
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu23.
---
Summary of changes:
htdocs/gcc-15/changes.html| 3 +-
htdocs/gcc-15/porting_to.html | 64 ++-
2 files changed, 65 insertions(+), 2 deletions(-)
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commit 4979889192aecb6c5693d1a48f2d5ca0d6d6b3a5
Author: David Malcolm
Date: Wed Jan 15 12:26:33 2025 -0500
gcc-15/porting_to: prefer to for non-std:: types
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 7344afa5..39598b93 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -82,11 +82,13 @@ As such, C++ programs that used standard library components
without
including the right headers will no longer compile.
-In particular, the following header is used less widely within libstdc++ and
+In particular, the following headers are used less widely within libstdc++ and
may need to be included explicitly when compiling with GCC 15:
-
+
+ (for int8_t, int32_t etc.)
+ and
(for std::int8_t, std::int32_t etc.)
commit f6ffc93bec5200fbf5fb16542d55c5b9dd0594c6
Author: David Malcolm
Date: Wed Jan 15 12:12:43 2025 -0500
gcc-15/porting_to: add section on new C23 keywords
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index e6da6cd9..7344afa5 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -43,6 +43,36 @@ to your build flags, or port your code to C23.
+New keywords
+
+ C23 added various new keywords, including
+ bool, true, false,
+ nullptr, and thread_local.
+ Code that uses these for identifiers will need changing.
+ For example typedef int bool; will
+ https://godbolt.org/z/7W8fMT9zd";>fail with:
+
+
+:1:13: error: 'bool' cannot be defined via 'typedef'
+1 | typedef int bool;
+ | ^~~~
+:1:13: note: 'bool' is a keyword with '-std=c23' onwards
+:1:1: warning: useless type name in empty declaration
+1 | typedef int bool;
+ | ^~~
+
+
+ In C99 and later you can use #include
+ which provides definitions of bool, true,
+ and false compatible with C23.
+
+
+ Note that the bool type is not the same
+ as int at ABI level, and so care may be needed porting
+ declarations that appear at an ABI boundary (or serialized to the
+ filesystem).
+
+
C++ language issues
Header dependency changes
commit 172ad664634bf0dd7c01c48a6c9dfa92e0cf3427
Author: David Malcolm
Date: Wed Jan 15 14:07:56 2025 -0500
gcc-15/porting_to: C23 by default
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 702cf507..e6da6cd9 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -27,7 +27,21 @@ and provide solutions. Let us know if you have suggestions
for improvements!
Note: GCC 15 has not been released yet, so this document is
a work-in-progress.
-
+C language issues
+
+C23 by default
+
+
+GCC 15 changes the default language version for C compilation from
+https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu17
+to
+https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu23.
+
+If your code relies on older versions of the C standard, you will need to
+either add https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=
+to your build flags, or port your code to C23.
+
+
C++ language issues
commit 4e3abc55705b3ac26c202523bc482c2691692885
Author: David Malcolm
Date: Wed Jan 15 14:05:47 2025 -0500
gcc-15/changes: C23 by default
Signed-off-by: David Malcolm
diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index d5037efb..c87c8a0d 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -99,6 +99,18 @@ a work-in-progress.
musttail statement attribute was added to enforce
tail calls.
+C
+
+ GCC 15 changes the default language version for C compilation from
+https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu17
+to
+https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu23.
+If your code relies on older versions of the C standard, you will need to
+either add
+https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=
+
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commit a886d546cbb54d071fe1bb83878bc7584de50800
Author: David Malcolm
Date: Mon Mar 31 14:27:42 2025 -0400
My GCC 15 changes
diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 3e3c6655..1b7d0e1b 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -38,6 +38,15 @@ You may also want to check out our
padding bits is desirable, use {} (valid in C23 or C++)
or use -fzero-init-padding-bits=unions option to restore
old GCC behavior.
+ https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html";>-fanalyzer
+is still only suitable for analyzing C code.
+In particular, using it on C++ is unlikely to give meaningful output.
+
+ The json format for
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-format";>-fdiagnostics-format=
+is deprecated and may be removed in a future release.
+Users seeking machine-readable diagnostics from GCC should use
+https://gcc.gnu.org/wiki/SARIF";>SARIF.
@@ -79,6 +88,20 @@ You may also want to check out our
significantly improved. The compiler can now track columnn numbers larger
than 4096. Very large source files have more accurate location reporting.
+ GCC can now emit diagnostics in multiple formats simultaneously,
+via the new option
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-add-output";>-fdiagnostics-add-output=.
+For example, use
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-add-output";>-fdiagnostics-add-output=sarif
+to get both GCC's classic text output on stderr and
+https://gcc.gnu.org/wiki/SARIF";>SARIF output to a file.
+There is also a new option
+ https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-set-output";>-fdiagnostics-set-output=
+which exposes more control than existing options for some experimental
cases.
+These new options are an alternative to the existing
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html#index-fdiagnostics-format";>-fdiagnostics-format=
+which only supports a single output format at a time.
+
@@ -301,7 +324,7 @@ procedure Initialize (Obj : in out T);
New constraints have been added for defining symbols or using symbols
inside of inline assembler, and a new generic operand modifier has
been added to allow printing those regardless of PIC. For example:
-
+
struct S { int a, b, c; };
extern foo (void);
extern char var;
@@ -313,7 +336,7 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
"-s" (var2), /* Tell compiler asm uses var2 variable. */
/* "s" would work too but might not work with -fpic. */
"i" (sizeof (struct S))); /* It is possible to pass constants to toplevel
asm. */
-
+
The "redzone" clobber is now allowed in inline
assembler statements to describe that the assembler can overwrite
@@ -333,6 +356,42 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
-Wheader-guard warning has been added and enabled
in -Wall to warn about some inconsistencies in header
file guarding macros.
+The C and C++ frontends now provide fix-it hints for some cases of
missing
+'&' and '*'.
+For example, note the ampersand fix-it hint in the following:
+
+demo.c: In function 'int main()':
+demo.c:5:22: error: invalid conversion from 'pthread_key_t' {aka 'unsigned
int'}
+ to 'pthread_key_t*' {aka 'unsigned int*'} [-fpermissive]
+5 | pthread_key_create(key, NULL);
+ | ^~~
+ | |
+ | pthread_key_t {aka unsigned int}
+demo.c:5:22: note: possible fix: take the address with '&'
+5 | pthread_key_create(key, NULL);
+ | ^~~
+ | &
+In file included from demo.c:1:
+/usr/include/pthread.h:1122:47: note: initializing argument 1 of
+ 'int pthread_key_create(pthread_key_t*, void (*)(void*))'
+ 1122 | extern int pthread_key_create (pthread_key_t *__key,
+ |~~~^
+
+
+Diagnostic messages referring to attributes now provide URLs
+
