Merge pull request #220 from tcbrindle/pr/drop-gcc11

Drop GCC 11

Author: tcbrindle

.github/workflows/linux.yml

@@ -11,13 +11,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        compiler: [GCC-11, GCC-12, GCC-13, GCC-14, Clang-17, Clang-18, Clang-19]
+        compiler: [GCC-12, GCC-13, GCC-14, Clang-17, Clang-18, Clang-19]
         test_with: [Headers, Module]
         build_type: [Debug, Release]
 
         exclude:
-          - compiler: GCC-11
-            test_with: Module
           - compiler: GCC-12
             test_with: Module
           - compiler: GCC-13
@@ -26,11 +24,6 @@ jobs:
             test_with: Module
 
         include:
-          - compiler: GCC-11
-            cxx: g++-11
-            install: |
-              brew install gcc@11 ninja binutils
-              brew link --force binutils
           - compiler: GCC-12
             cxx: g++-12
             install: |

README.md

@@ -77,7 +77,7 @@ See the vcpkg documentation for more details.
 
 Flux requires a recent compiler with good support for the C++20 standard. It is tested with:
 
-* GCC 11.3 and newer
+* GCC 12 and newer
 * LLVM Clang 16 and newer
 * MSVC 2022
 * AppleClang/Xcode 16

docs/reference/algorithms.rst

@@ -109,7 +109,7 @@ Algorithms
         :language: cpp
         :linenos:
         :dedent:
-        :lines: 21-52
+        :lines: 16-44
 
     :see also:
         * `std::lexicographical_compare_three_way() <https://en.cppreference.com/w/cpp/algorithm/lexicographical_compare_three_way>`_

example/docs/compare.cpp

@@ -10,11 +10,6 @@
 #include <limits>
 #include <vector>
 
-#ifdef _GLIBCXX_RELEASE
-#if _GLIBCXX_RELEASE < 12
-#define COMPILER_IS_GCC11
-#endif
-#endif
 
 int main()
 {
@@ -43,11 +38,8 @@ int main()
 
     // On most systems we can use std::strong_order as a custom comparator
     // to get a total order for IEEE floats
-    // (Note that this is not supported with GCC 11)
-    #ifndef COMPILER_IS_GCC11
     if constexpr (std::numeric_limits<double>::is_iec559) {
         assert(flux::compare(v5, v6, std::strong_order) ==
                  std::strong_ordering::less);
     }
-    #endif
 }

example/top10/07_max_gap_count.cpp

@@ -11,11 +11,6 @@
 
 #include <flux.hpp>
 
-// GCC 11 doesn't support constexpr std::vector
-#if defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE < 12
-#define COMPILER_IS_GCC11
-#endif
-
 // std::abs is not constexpr in C++20
 auto const c_abs = [](std::signed_integral auto i) { return i < 0 ? -i : i; };
 
@@ -31,11 +26,9 @@ auto const max_gap_count = [](std::vector<int> nums)
     return diffs.count_eq(diffs.max().value_or(0));
 };
 
-#ifndef COMPILER_IS_GCC11
 static_assert(max_gap_count({2, 5, 8, 1}) == 2);
 static_assert(max_gap_count({3, 6, 9, 1}) == 2);
 static_assert(max_gap_count({10}) == 0);
-#endif
 
 }
 
@@ -63,27 +56,11 @@ auto const max_gap_count = [](std::vector<int> nums)
             .count;
 };
 
-#ifndef COMPILER_IS_GCC11
 static_assert(max_gap_count({2, 5, 8, 1}) == 2);
 static_assert(max_gap_count({3, 6, 9, 1}) == 2);
 static_assert(max_gap_count({10}) == 0);
-#endif
 
 }
 
 int main()
-{
-    {
-        using namespace version1;
-        FLUX_ASSERT(max_gap_count({2, 5, 8, 1}) == 2);
-        FLUX_ASSERT(max_gap_count({3, 6, 9, 1}) == 2);
-        FLUX_ASSERT(max_gap_count({10}) == 0);
-    }
-
-    {
-        using namespace version2;
-        FLUX_ASSERT(max_gap_count({2, 5, 8, 1}) == 2);
-        FLUX_ASSERT(max_gap_count({3, 6, 9, 1}) == 2);
-        FLUX_ASSERT(max_gap_count({10}) == 0);
-    }
-}
+{}

include/flux/core/concepts.hpp

@@ -18,7 +18,7 @@
 
 // clang-format off
 
-// Workaround GCC11/12 ICE in sequence concept definition below
+// Workaround GCC12 ICE in sequence concept definition below
 #if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 13)
 #define FLUX_COMPILER_IS_GCC12
 #endif

test/test_optional.cpp

@@ -16,8 +16,8 @@
 
 namespace {
 
-// GCC11 std::string isn't usable in constexpr, so here's a quick and dirty
-// version instead
+// Constexpr use of std::string causes problems with some compiler/stdlib
+// combinations, so here's a quick-and-dirty constexpr string instead
 struct String {
 private:
     using Traits = std::char_traits<char>;