[TCWG CI] Failure after basepoints/gcc-13-4795-g263c22a95bc: build: add -Wconditionally-supported to strict_warn [PR64867]

[TCWG CI] Failure after basepoints/gcc-13-4795-g263c22a95bc: build: add -Wconditionally-supported to strict_warn [PR64867]

[ci_notify]

[-- Attachment #1: Type: text/plain, Size: 5190 bytes --]

Failure after basepoints/gcc-13-4795-g263c22a95bc: build: add -Wconditionally-supported to strict_warn [PR64867]:

Results changed to
-10
# true:
0
# build_abe binutils:
1
# build_abe bootstrap:
# FAILED
# First few build errors in logs:
# 00:05:17 make[3]: [Makefile:1817: aarch64-unknown-linux-gnu/bits/largefile-config.h] Error 1 (ignored)
# 00:05:17 make[3]: [Makefile:1818: aarch64-unknown-linux-gnu/bits/largefile-config.h] Error 1 (ignored)
# 00:10:16 /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/gcc/sort.cc:245:11: error: casting between pointer-to-function and pointer-to-object is conditionally-supported [-Werror=conditionally-supported]
# 00:10:16 /home/tcwg-buildslave/workspace/tcwg_gnu_1/abe/snapshots/gcc.git~master/gcc/sort.cc:268:39: error: casting between pointer-to-function and pointer-to-object is conditionally-supported [-Werror=conditionally-supported]
# 00:10:17 make[3]: *** [Makefile:2850: build/sort.o] Error 1
# 00:10:25 make[2]: *** [Makefile:5013: all-stage2-gcc] Error 2
# 00:10:25 make[1]: *** [Makefile:25763: stage2-bubble] Error 2
# 00:10:25 make: *** [Makefile:1080: all] Error 2

from
-10
# true:
0
# build_abe binutils:
1
# build_abe bootstrap:
2

THIS IS THE END OF INTERESTING STUFF.  BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT.

For latest status see comments in https://linaro.atlassian.net/browse/GNU-692 .
Status of basepoints/gcc-13-4795-g263c22a95bc commit for tcwg_gcc_bootstrap:
commit 263c22a95bc9a0d80c4873c0291b0f938cea7310
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Dec 5 10:00:31 2022 -0500

    build: add -Wconditionally-supported to strict_warn [PR64867]
    
    The PR (which isn't resolved by this commit) pointed out to me that GCC
    should build with -Wconditionally-supported to support bootstrapping with a
    C++11 compiler that makes different choices.
    
            PR c++/64867
    
    gcc/ChangeLog:
    
            * configure.ac (strict_warn): Add -Wconditionally-supported.
            * configure: Regenerate.
* master-aarch64-bootstrap
** Failure after basepoints/gcc-13-4795-g263c22a95bc: build: add -Wconditionally-supported to strict_warn [PR64867]:
** https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-aarch64-bootstrap/1881/

Bad  build: https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-aarch64-bootstrap/1881/artifact/artifacts
Good build: https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-aarch64-bootstrap/1880/artifact/artifacts

Reproduce current build:
<cut>
mkdir -p investigate-gcc-263c22a95bc9a0d80c4873c0291b0f938cea7310
cd investigate-gcc-263c22a95bc9a0d80c4873c0291b0f938cea7310

# Fetch scripts
git clone https://git.linaro.org/toolchain/jenkins-scripts

# Fetch manifests for bad and good builds
mkdir -p bad/artifacts good/artifacts
curl -o bad/artifacts/manifest.sh https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-aarch64-bootstrap/1881/artifact/artifacts/manifest.sh --fail
curl -o good/artifacts/manifest.sh https://ci.linaro.org/job/tcwg_gcc_bootstrap-build-master-aarch64-bootstrap/1880/artifact/artifacts/manifest.sh --fail

# Reproduce bad build
(cd bad; ../jenkins-scripts/tcwg_gnu-build.sh ^^ true %%rr[top_artifacts] artifacts)
# Reproduce good build
(cd good; ../jenkins-scripts/tcwg_gnu-build.sh ^^ true %%rr[top_artifacts] artifacts)
</cut>

Full commit (up to 1000 lines):
<cut>
commit 263c22a95bc9a0d80c4873c0291b0f938cea7310
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Dec 5 10:00:31 2022 -0500

    build: add -Wconditionally-supported to strict_warn [PR64867]
    
    The PR (which isn't resolved by this commit) pointed out to me that GCC
    should build with -Wconditionally-supported to support bootstrapping with a
    C++11 compiler that makes different choices.
    
            PR c++/64867
    
    gcc/ChangeLog:
    
            * configure.ac (strict_warn): Add -Wconditionally-supported.
            * configure: Regenerate.
---
 gcc/configure    | 2 +-
 gcc/configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/configure b/gcc/configure
index 61b3cedbe69..921aad60712 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -7215,7 +7215,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 strict_warn=
 save_CXXFLAGS="$CXXFLAGS"
-for real_option in -Wmissing-format-attribute -Woverloaded-virtual; do
+for real_option in -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual; do
   # Do the check with the no- prefix removed since gcc silently
   # accepts any -Wno-* option on purpose
   case $real_option in
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 5efbf11793c..b91f54ce05b 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -580,7 +580,7 @@ ACX_PROG_CC_WARNING_OPTS(
 	m4_quote(m4_do([-Wstrict-prototypes -Wmissing-prototypes ],
 		       [])), [c_loose_warn])
 ACX_PROG_CXX_WARNING_OPTS(
-	m4_quote(m4_do([-Wmissing-format-attribute ],
+	m4_quote(m4_do([-Wmissing-format-attribute ], [-Wconditionally-supported ],
 		       [-Woverloaded-virtual])), [strict_warn])
 ACX_PROG_CC_WARNING_OPTS(
 	m4_quote(m4_do([-Wold-style-definition -Wc++-compat])), [c_strict_warn])
</cut>