User:Dmalcolm/gcc-15: Difference between revisions

Latest revision as of 17:21, 18 December 2024

GCC 15 mass prebuild

These are notes to myself on my attempts to use mass-prebuilder to test GCC 15 in Fedora in December 2024 in preparation for Changes/GNUToolchainF42

Current status

Timeout building GCC in copr, so using one of Jakub's scratch builds, turned into repos here.
Disabling annobin in redhat-rpm-config in the copr for now due to https://sourceware.org/bugzilla/show_bug.cgi?id=32429
Tracker bug for failures here

libtool can't be installed

Problem: cannot install both gcc-15.0.0-0.2.fc42.aarch64 from https_dmalcolm_fedorapeople_org_gcc_gcc_15_mass_prebuild_arch and gcc-14.2.1-6.fc42.aarch64 from fedora
  - package libtool-2.5.4-1.fc42.aarch64 from fedora requires gcc(major) = 14, but none of the providers can be installed
  - cannot install the best candidate for the job
  - conflicting requests
You can try to add to command line:
  --no-best to not limit the transaction to the best candidates

Copr build error: Build failed

Older status

Was having quota issues uploading the repos, so was only testing aarch64 at first. This is now fixed.

Function prototypes with empty params change from implicit "int" to "void"

GCC 15 defaults to C23, in which () now means the same as (void) in both function declarations and definitions, where previously that change had been made for definitions only.

Hence

extern int foo();

now means:

extern int foo(void);

rather than:

extern int foo(int)

which may require changes to prototypes and header files (or the use of -std=c17 or similar).

Note: the commit in question was https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=0a4b219d39c74aec7ebf87ac3be38d8f93efd634

Examples:

rhbz#2331208 epson-inkjet-printer-escpr fails to build with GCC 15 (implicit int param in function prototype)

@@ Line 1: / Line 1: @@
 == GCC 15 mass prebuild ==
-These are notes to myself on my attempts to use mass-prebuilder to test [https://gcc.gnu.org/gcc-15/changes.html GCC 15] in Fedora in December 2024
+These are notes to myself on my attempts to use mass-prebuilder to test [https://gcc.gnu.org/gcc-15/changes.html GCC 15] in Fedora in December 2024 in preparation for [[Changes/GNUToolchainF42]]
 === Current status ===
 * Timeout building GCC in copr, so using one of Jakub's scratch builds, turned into repos [https://dmalcolm.fedorapeople.org/gcc/gcc-15-mass-prebuild/ here].
-** Currently having [https://pagure.io/fedora-infrastructure/issue/12325 quota issues] uploading the repos, so only testing aarch64 for now
 * Disabling annobin in redhat-rpm-config in the copr for now due to https://sourceware.org/bugzilla/show_bug.cgi?id=32429
+* Tracker bug for failures [https://bugzilla.redhat.com/buglist.cgi?bug_id=2333037&bug_id_type=anddependson&format=tvp&list_id=13537350 here]
 ==== libtool can't be installed ====
@@ Line 19: / Line 19: @@
 Copr build error: Build failed
 </pre>
+=== Older status ===
+* Was having [https://pagure.io/fedora-infrastructure/issue/12325 quota issues] uploading the repos, so was only testing aarch64 at first.  This is now fixed.
 === Function prototypes with empty params change from implicit "int" to "void" ===
-GCC 15 defaults to C23, in which I believe that
+GCC 15 defaults to C23, in which `()` now means the same as `(void)` in both function declarations and definitions, where previously that change had been made for definitions only.
+Hence
 <pre>
 extern int foo();
 </pre>
-in a decl now means
+now means:
 <pre>
 extern int foo(void);
@@ Line 34: / Line 39: @@
 </pre>
-"void" rather than implicit "int"; TODO: get chapter-and-verse for this
+which may require changes to prototypes and header files (or the use of `-std=c17` or similar).
+Note: the commit in question was https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=0a4b219d39c74aec7ebf87ac3be38d8f93efd634
+Examples:
+* [https://bugzilla.redhat.com/show_bug.cgi?id=2331208 rhbz#2331208] epson-inkjet-printer-escpr fails to build with GCC 15 (implicit int param in function prototype)

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