$ git diff --patch-with-stat --summary 4eddd163ce0b7d29413b7eae39e16866dc168993..bf2ce658453f0970ce7518e305e7fa7c4ca4ed7f

 .abf.yml                                           |  2 +-
 ...-3.0.5-check-for-__builtin_mul_overflow_p.patch | 53 +++++++++++-----------
 bison.spec                                         | 47 ++++++++++++++++---
 3 files changed, 69 insertions(+), 33 deletions(-)

diff --git a/.abf.yml b/.abf.yml
index 2370aa6..c7a2483 100644
--- a/.abf.yml
+++ b/.abf.yml
@@ -1,2 +1,2 @@
 sources:
-  bison-3.4.1.tar.xz: dcd51c1ba3323c6c54af4a55d0a39b83a74d195e
+  bison-3.4.2.tar.xz: 5aa25aad924da6eda6df03a697f59d85081c5551
diff --git a/bison-3.0.5-check-for-__builtin_mul_overflow_p.patch b/bison-3.0.5-check-for-__builtin_mul_overflow_p.patch
index 27ca1a4..fd5490a 100644
--- a/bison-3.0.5-check-for-__builtin_mul_overflow_p.patch
+++ b/bison-3.0.5-check-for-__builtin_mul_overflow_p.patch
@@ -1,7 +1,7 @@
-diff -up bison-3.1/configure.ac.3~ bison-3.1/configure.ac
---- bison-3.1/configure.ac.3~	2018-08-25 10:55:03.000000000 +0200
-+++ bison-3.1/configure.ac	2018-08-28 03:06:13.218991176 +0200
-@@ -56,6 +56,18 @@ AC_PROG_CXX
+diff -Naur bison-3.4.2/configure.ac bison-3.4.2.tpg/configure.ac
+--- bison-3.4.2/configure.ac	2019-09-12 07:05:52.000000000 +0000
++++ bison-3.4.2.tpg/configure.ac	2019-09-16 19:57:08.593778447 +0000
+@@ -57,6 +57,18 @@
  # Gnulib (early checks).
  gl_EARLY
  
@@ -20,14 +20,15 @@ diff -up bison-3.1/configure.ac.3~ bison-3.1/configure.ac
  # Gnulib uses '#pragma GCC diagnostic push' to silence some
  # warnings, but older gcc doesn't support this.
  AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
-diff -up bison-3.1/lib/intprops.h.3~ bison-3.1/lib/intprops.h
---- bison-3.1/lib/intprops.h.3~	2018-05-08 12:04:17.000000000 +0200
-+++ bison-3.1/lib/intprops.h	2018-08-28 03:06:13.219991179 +0200
-@@ -225,14 +225,11 @@
- # define _GL_HAS_BUILTIN_OVERFLOW 0
+diff -Naur bison-3.4.2/lib/intprops.h bison-3.4.2.tpg/lib/intprops.h
+--- bison-3.4.2/lib/intprops.h	2019-09-08 16:06:53.000000000 +0000
++++ bison-3.4.2.tpg/lib/intprops.h	2019-09-16 19:58:15.443681588 +0000
+@@ -248,15 +248,11 @@
+ # define _GL_HAS_BUILTIN_MUL_OVERFLOW _GL_HAS_BUILTIN_ADD_OVERFLOW
  #endif
  
--/* True if __builtin_add_overflow_p (A, B, C) works.  */
+-/* True if __builtin_add_overflow_p (A, B, C) works, and similarly for
+-   __builtin_mul_overflow_p and __builtin_mul_overflow_p.  */
 -#define _GL_HAS_BUILTIN_OVERFLOW_P (7 <= __GNUC__)
 -
  /* The _GL*_OVERFLOW macros have the same restrictions as the
@@ -39,7 +40,7 @@ diff -up bison-3.1/lib/intprops.h.3~ bison-3.1/lib/intprops.h
  # define _GL_ADD_OVERFLOW(a, b, min, max)                               \
     __builtin_add_overflow_p (a, b, (__typeof__ ((a) + (b))) 0)
  # define _GL_SUBTRACT_OVERFLOW(a, b, min, max)                          \
-@@ -318,7 +315,7 @@
+@@ -346,7 +342,7 @@
    _GL_BINARY_OP_OVERFLOW (a, b, _GL_ADD_OVERFLOW)
  #define INT_SUBTRACT_OVERFLOW(a, b) \
    _GL_BINARY_OP_OVERFLOW (a, b, _GL_SUBTRACT_OVERFLOW)
@@ -48,11 +49,11 @@ diff -up bison-3.1/lib/intprops.h.3~ bison-3.1/lib/intprops.h
  # define INT_NEGATE_OVERFLOW(a) INT_SUBTRACT_OVERFLOW (0, a)
  #else
  # define INT_NEGATE_OVERFLOW(a) \
-diff -up bison-3.1/lib/mbrtowc.c.3~ bison-3.1/lib/mbrtowc.c
---- bison-3.1/lib/mbrtowc.c.3~	2018-08-28 03:06:13.219991179 +0200
-+++ bison-3.1/lib/mbrtowc.c	2018-08-28 03:06:38.130079217 +0200
-@@ -36,7 +36,7 @@
- # include "verify.h"
+diff -Naur bison-3.4.2/lib/mbrtowc.c bison-3.4.2.tpg/lib/mbrtowc.c
+--- bison-3.4.2/lib/mbrtowc.c	2019-09-08 16:02:32.000000000 +0000
++++ bison-3.4.2.tpg/lib/mbrtowc.c	2019-09-16 19:59:42.918508124 +0000
+@@ -37,7 +37,7 @@
+ # include "glthread/lock.h"
  
  # ifndef FALLTHROUGH
 -#  if __GNUC__ < 7
@@ -60,9 +61,9 @@ diff -up bison-3.1/lib/mbrtowc.c.3~ bison-3.1/lib/mbrtowc.c
  #   define FALLTHROUGH ((void) 0)
  #  else
  #   define FALLTHROUGH __attribute__ ((__fallthrough__))
-diff -up bison-3.1/lib/quotearg.c.3~ bison-3.1/lib/quotearg.c
---- bison-3.1/lib/quotearg.c.3~	2018-05-08 12:02:49.000000000 +0200
-+++ bison-3.1/lib/quotearg.c	2018-08-28 03:06:13.219991179 +0200
+diff -Naur bison-3.4.2/lib/quotearg.c bison-3.4.2.tpg/lib/quotearg.c
+--- bison-3.4.2/lib/quotearg.c	2019-03-28 18:54:35.000000000 +0000
++++ bison-3.4.2.tpg/lib/quotearg.c	2019-09-16 19:59:30.667533942 +0000
 @@ -55,7 +55,7 @@
  #define INT_BITS (sizeof (int) * CHAR_BIT)
  
@@ -72,9 +73,9 @@ diff -up bison-3.1/lib/quotearg.c.3~ bison-3.1/lib/quotearg.c
  #  define FALLTHROUGH ((void) 0)
  # else
  #  define FALLTHROUGH __attribute__ ((__fallthrough__))
-diff -up bison-3.1/lib/vasnprintf.c.3~ bison-3.1/lib/vasnprintf.c
---- bison-3.1/lib/vasnprintf.c.3~	2018-05-08 12:04:20.000000000 +0200
-+++ bison-3.1/lib/vasnprintf.c	2018-08-28 03:06:13.220991183 +0200
+diff -Naur bison-3.4.2/lib/vasnprintf.c bison-3.4.2.tpg/lib/vasnprintf.c
+--- bison-3.4.2/lib/vasnprintf.c	2019-04-21 15:57:54.000000000 +0000
++++ bison-3.4.2.tpg/lib/vasnprintf.c	2019-09-16 20:00:10.631450550 +0000
 @@ -119,7 +119,7 @@
  #endif
  
@@ -84,10 +85,10 @@ diff -up bison-3.1/lib/vasnprintf.c.3~ bison-3.1/lib/vasnprintf.c
  #  define FALLTHROUGH ((void) 0)
  # else
  #  define FALLTHROUGH __attribute__ ((__fallthrough__))
-diff -up bison-3.1/lib/xalloc-oversized.h.3~ bison-3.1/lib/xalloc-oversized.h
---- bison-3.1/lib/xalloc-oversized.h.3~	2018-05-08 12:02:49.000000000 +0200
-+++ bison-3.1/lib/xalloc-oversized.h	2018-08-28 03:06:13.220991183 +0200
-@@ -41,7 +41,7 @@ typedef size_t __xalloc_count_type;
+diff -Naur bison-3.4.2/lib/xalloc-oversized.h bison-3.4.2.tpg/lib/xalloc-oversized.h
+--- bison-3.4.2/lib/xalloc-oversized.h	2019-03-28 18:54:35.000000000 +0000
++++ bison-3.4.2.tpg/lib/xalloc-oversized.h	2019-09-16 20:00:42.104386535 +0000
+@@ -41,7 +41,7 @@
     positive and N must be nonnegative.  This is a macro, not a
     function, so that it works correctly even when SIZE_MAX < N.  */
  
diff --git a/bison.spec b/bison.spec
index bd489a9..da1d48f 100644
--- a/bison.spec
+++ b/bison.spec
@@ -1,11 +1,21 @@
+# dont want lto on a static lib
+%define _disable_lto 1
+
 %define _disable_rebuild_configure 1
 %ifnarch riscv64
 %global optflags %{optflags} -O3 --rtlib=compiler-rt
 %endif
 
+# (tpg) enable PGO build
+%ifnarch riscv64
+%bcond_without pgo
+%else
+%bcond_with pgo
+%endif
+
 Summary:	A GNU general-purpose parser generator
 Name:		bison
-Version:	3.4.1
+Version:	3.4.2
 Release:	1
 License:	GPLv3
 Group:		Development/Other
@@ -41,19 +51,44 @@ If your system will be used for C development, you should install Bison
 since it is used to build many C programs.
 
 %prep
-%setup -q
-%autopatch -p1
+%autosetup -p1
 
 %build
+%if %{with pgo}
+CFLAGS="%{optflags} -fprofile-instr-generate"
+CXXFLAGS="%{optflags} -fprofile-instr-generate"
+FFLAGS="$CFLAGS"
+FCFLAGS="$CFLAGS"
+LDFLAGS="%{ldflags} -fprofile-instr-generate"
+export LLVM_PROFILE_FILE=%{name}-%p.profile.d
+export LD_LIBRARY_PATH="$(pwd)"
+
+%configure \
+	--disable-rpath \
+	--enable-threads
+
+%make_build
+
+make -j1 check ||:
+
+unset LD_LIBRARY_PATH
+unset LLVM_PROFILE_FILE
+llvm-profdata merge --output=%{name}.profile *.profile.d
+rm -f *.profile.d
+make clean
+
+CFLAGS="%{optflags} -fprofile-instr-use=$(realpath %{name}.profile)" \
+CXXFLAGS="%{optflags} -fprofile-instr-use=$(realpath %{name}.profile)" \
+LDFLAGS="%{ldflags} -fprofile-instr-use=$(realpath %{name}.profile)" \
+%endif
 %configure \
 	--disable-rpath \
 	--enable-threads
 
 %make_build
 
-# (tpg) 2019-05-26 disable for now
-#check
-#make check
+%check
+make -j1 check ||:
 
 %install
 %make_install