[gcc r11-7082] libstdc++: Work around test failures using -mno-tree-vrp

[Jonathan Wakely]

https://gcc.gnu.org/g:3de9bd16c91c5fc050961db6887880b303b3a630

commit r11-7082-g3de9bd16c91c5fc050961db6887880b303b3a630
Author: Matthias Kretz <kretz@kde.org>
Date:   Wed Feb 3 15:49:30 2021 +0000

    libstdc++: Work around test failures using -mno-tree-vrp
    
    This is necessary to avoid failures resulting from PR98834.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/Makefile.am: Warn about the workaround. Add
            -fno-tree-vrp to CXXFLAGS passed to the check_simd script.
            Improve initial user feedback from make check-simd.
            * testsuite/Makefile.in: Regenerated.

Diff:
---
 libstdc++-v3/testsuite/Makefile.am | 4 +++-
 libstdc++-v3/testsuite/Makefile.in | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/testsuite/Makefile.am b/libstdc++-v3/testsuite/Makefile.am
index 2d3ad481dba..ba5023a8b54 100644
--- a/libstdc++-v3/testsuite/Makefile.am
+++ b/libstdc++-v3/testsuite/Makefile.am
@@ -191,8 +191,10 @@ check-simd: $(srcdir)/experimental/simd/generate_makefile.sh \
 	    ${glibcxx_srcdir}/scripts/check_simd \
 	    testsuite_files_simd \
 	    ${glibcxx_builddir}/scripts/testsuite_flags
+	@echo "WARNING: Adding -fno-tree-vrp to CXXFLAGS to work around PR98834."
 	@rm -f .simd.summary
-	${glibcxx_srcdir}/scripts/check_simd "${glibcxx_srcdir}" "${glibcxx_builddir}" "$(CXXFLAGS)" | \
+	@echo "Generating simd testsuite subdirs and Makefiles ..."
+	@${glibcxx_srcdir}/scripts/check_simd "${glibcxx_srcdir}" "${glibcxx_builddir}" "$(CXXFLAGS) -fno-tree-vrp" | \
 	  while read subdir; do \
 	    $(MAKE) -C "$${subdir}"; \
 	    tail -n20 $${subdir}/simd_testsuite.sum | \
diff --git a/libstdc++-v3/testsuite/Makefile.in b/libstdc++-v3/testsuite/Makefile.in
index ac6207ae75c..c9dd7f5da61 100644
--- a/libstdc++-v3/testsuite/Makefile.in
+++ b/libstdc++-v3/testsuite/Makefile.in
@@ -716,8 +716,10 @@ check-simd: $(srcdir)/experimental/simd/generate_makefile.sh \
 	    ${glibcxx_srcdir}/scripts/check_simd \
 	    testsuite_files_simd \
 	    ${glibcxx_builddir}/scripts/testsuite_flags
+	@echo "WARNING: Adding -fno-tree-vrp to CXXFLAGS to work around PR98834."
 	@rm -f .simd.summary
-	${glibcxx_srcdir}/scripts/check_simd "${glibcxx_srcdir}" "${glibcxx_builddir}" "$(CXXFLAGS)" | \
+	@echo "Generating simd testsuite subdirs and Makefiles ..."
+	@${glibcxx_srcdir}/scripts/check_simd "${glibcxx_srcdir}" "${glibcxx_builddir}" "$(CXXFLAGS) -fno-tree-vrp" | \
 	  while read subdir; do \
 	    $(MAKE) -C "$${subdir}"; \
 	    tail -n20 $${subdir}/simd_testsuite.sum | \