4 files changed, 55 insertions, 8 deletions
diff --git a/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc b/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc
new file mode 100644
index 00000000000..5b6fea7b560
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/gcd/105844.cc
@@ -0,0 +1,21 @@
+// { dg-do compile { target c++17 } }
+#include <numeric>
+#include <climits>
+
+// PR libstdc++/105844
+
+// |INT_MIN| can be represented in common_type_t<int, unsigned> i.e. unsigned.
+static_assert( std::gcd(INT_MIN, 2u) == 2 );
+static_assert( std::gcd(2u, INT_MIN) == 2 );
+
+// |LLONG_MIN| can be represented in unsigned long long.
+static_assert( std::gcd(LLONG_MIN, 2ull) == 2 );
+static_assert( std::gcd(2ull, LLONG_MIN) == 2 );
+
+// But |INT_MIN| cannot be represented in common_type<int, int> i.e. int.
+constexpr int a = std::gcd(INT_MIN, 1); // { dg-error "overflow" }
+constexpr int b = std::gcd(1, INT_MIN); // { dg-error "overflow" }
+
+// And |LLONG_MIN| cannot be represented in long.
+constexpr long long c = std::gcd(LLONG_MIN, 1); // { dg-error "overflow" }
+constexpr long long d = std::gcd(1, LLONG_MIN); // { dg-error "overflow" }
diff --git a/libstdc++-v3/testsuite/26_numerics/gcd/gcd_neg.cc b/libstdc++-v3/testsuite/26_numerics/gcd/gcd_neg.cc
index c9faeebc269..e5d03a9a453 100644
--- a/libstdc++-v3/testsuite/26_numerics/gcd/gcd_neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/gcd/gcd_neg.cc
@@ -45,9 +45,11 @@ test01()
   std::gcd<const int&, const int&>(0.1, 0.1);   // { dg-error "from here" }
 }
 
-// { dg-error "must be integers" "" { target *-*-* } 169 }
-// { dg-error "must be integers" "" { target *-*-* } 170 }
-// { dg-error "must not be bool" "" { target *-*-* } 171 }
-// { dg-error "must not be bool" "" { target *-*-* } 172 }
+// { dg-error "must be integers" "" { target *-*-* } 0 }
+// { dg-error "must not be bool" "" { target *-*-* } 0 }
+// These prunes could be removed if a fix for PR c++/96286 stops them.
 // { dg-prune-output "deleted function" }
 // { dg-prune-output "incomplete type .*make_unsigned" }
+// { dg-prune-output "does not have integral type" }
+// { dg-prune-output "non-integral type" }
+// { dg-prune-output "invalid specialization" }
diff --git a/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc b/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc
new file mode 100644
index 00000000000..d0e032e03e0
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/lcm/105844.cc
@@ -0,0 +1,22 @@
+// { dg-do compile { target c++17 } }
+#include <numeric>
+#include <climits>
+
+// PR libstdc++/105844
+
+// |INT_MIN| can be represented in common_type_t<int, unsigned> i.e. unsigned.
+static_assert( std::lcm(INT_MIN, 1u) == INT_MAX+1u );
+static_assert( std::lcm(1u, INT_MIN) == INT_MAX+1u );
+
+// But |INT_MIN| cannot be represented in common_type<int, int> i.e. int.
+constexpr int a = std::lcm(INT_MIN, 1); // { dg-error "overflow" }
+constexpr int b = std::lcm(1, INT_MIN); // { dg-error "overflow" }
+
+// And the LCM of 50000 and 49999 cannot be represented in int.
+constexpr int c = std::lcm(50000, 49999); // { dg-error "overflow" }
+constexpr int d = std::lcm(49999, 50000); // { dg-error "overflow" }
+
+// Similarly for unsigned, but the diagnostic is a failed assertion instead.
+constexpr int e = std::lcm(500000u, 499999); // { dg-error "in 'constexpr'" }
+constexpr int f = std::lcm(499999u, 500000); // { dg-error "in 'constexpr'" }
+// { dg-error "unreachable" "" { target *-*-* } 0 }
diff --git a/libstdc++-v3/testsuite/26_numerics/lcm/lcm_neg.cc b/libstdc++-v3/testsuite/26_numerics/lcm/lcm_neg.cc
index 6c3c9d0c02a..77cb974aab4 100644
--- a/libstdc++-v3/testsuite/26_numerics/lcm/lcm_neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/lcm/lcm_neg.cc
@@ -45,9 +45,11 @@ test01()
   std::lcm<const int&, const int&>(0.1, 0.1);   // { dg-error "from here" }
 }
 
-// { dg-error "must be integers" "" { target *-*-* } 183 }
-// { dg-error "must be integers" "" { target *-*-* } 184 }
-// { dg-error "must not be bool" "" { target *-*-* } 185 }
-// { dg-error "must not be bool" "" { target *-*-* } 186 }
+// { dg-error "must be integers" "" { target *-*-* } 0 }
+// { dg-error "must not be bool" "" { target *-*-* } 0 }
+// These prunes could be removed if a fix for PR c++/96286 stops them.
 // { dg-prune-output "deleted function" }
 // { dg-prune-output "incomplete type .*make_unsigned" }
+// { dg-prune-output "does not have integral type" }
+// { dg-prune-output "non-integral type" }
+// { dg-prune-output "invalid specialization" }