gnu: abseil-cpp: Fix build on i686-linux.

* gnu/packages/cpp.scm (abseil-cpp)[source]: Add patch.
(abseil-cpp-20220623.1)[source]: Same.
* gnu/packages/patches/abseil-cpp-20220623.1-no-kepsilon-i686.patch: New
file.
* gnu/local.mk (dist_patch_DATA): Register it.

Change-Id: I27b9abc2c44ff6dc313209f4b0b12542a92d6fcd

gnu/local.mk

@@ -913,6 +913,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/abiword-explictly-cast-bools.patch	\
   %D%/packages/patches/abseil-cpp-20200923.3-adjust-sysinfo.patch	\
   %D%/packages/patches/abseil-cpp-20200923.3-duration-test.patch	\
+  %D%/packages/patches/abseil-cpp-20220623.1-no-kepsilon-i686.patch	\
   %D%/packages/patches/abseil-cpp-fix-strerror_test.patch	\
   %D%/packages/patches/adb-add-libraries.patch			\
   %D%/packages/patches/adb-libssl_11-compatibility.patch	\

gnu/packages/cpp.scm

@@ -1456,7 +1456,9 @@ Google's C++ code base.")
                 (file-name (git-file-name name version))
                 (sha256
                  (base32
-                  "0vxh2a74g4s45yr8kdjqnzl64k10qdlc0hbnn987a4cnwdj4bp9r"))))
+                  "0vxh2a74g4s45yr8kdjqnzl64k10qdlc0hbnn987a4cnwdj4bp9r"))
+                (patches
+                 (search-patches "abseil-cpp-20220623.1-no-kepsilon-i686.patch"))))
       (arguments
        (substitute-keyword-arguments (package-arguments base)
          ((#:configure-flags flags)
@@ -1477,7 +1479,9 @@ Google's C++ code base.")
                 (file-name (git-file-name name version))
                 (sha256
                  (base32
-                  "1ydkkbanrpkp5i814arzsk973kyzhhjhagnp392rq6rrv16apldq"))))
+                  "1ydkkbanrpkp5i814arzsk973kyzhhjhagnp392rq6rrv16apldq"))
+                (patches
+                 (search-patches "abseil-cpp-20220623.1-no-kepsilon-i686.patch"))))
       (arguments
        (substitute-keyword-arguments (package-arguments base)
          ((#:phases phases)

gnu/packages/patches/abseil-cpp-20220623.1-no-kepsilon-i686.patch

@@ -0,0 +1,23 @@
+After an upstream code dump on 20220314 when this code was added this test started to fail on i686-linux.
+
+diff --git a/absl/random/uniform_real_distribution_test.cc b/absl/random/uniform_real_distribution_test.cc
+index 260aac96..0abef9b0 100644
+--- a/absl/random/uniform_real_distribution_test.cc
++++ b/absl/random/uniform_real_distribution_test.cc
+@@ -228,6 +228,8 @@ TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
+ 
+ #endif  // GTEST_HAS_DEATH_TEST
+ #if defined(NDEBUG)
++  // Except apparently not with 387 math
++#if !((defined(__i386__) || defined(_M_IX86)) && FLT_EVAL_METHOD != 0)
+   // opt-mode, for invalid parameters, will generate a garbage value,
+   // but should not enter an infinite loop.
+   absl::InsecureBitGen gen;
+@@ -243,6 +245,7 @@ TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
+     // Infinite result.
+     EXPECT_FALSE(std::isfinite(x)) << x;
+   }
++#endif  // skip on i386
+ #endif  // NDEBUG
+ }
+ #ifdef _MSC_VER