Issue #24915: Make PGO builds support Clang and use the test suite for

profile data.

Thanks to Alecsandru Patrascu of Intel for the initial patch.

1 files changed, 45 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 2c998b1ee9..decf0ec742 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1352,6 +1352,51 @@ then
   CFLAGS=$save_CFLAGS
 fi
 
+
+# Enable PGO flags.
+AC_SUBST(PGO_PROF_GEN_FLAG)
+AC_SUBST(PGO_PROF_USE_FLAG)
+AC_SUBST(LLVM_PROF_MERGER)
+AC_SUBST(LLVM_PROF_FILE)
+AC_SUBST(LLVM_PROF_ERR)
+AC_SUBST(LLVM_PROF_FOUND)
+AC_CHECK_PROG(LLVM_PROF_FOUND, llvm-profdata, found, not-found)
+LLVM_PROF_ERR=no
+case $CC in
+  *clang*)
+    # Any changes made here should be reflected in the GCC+Darwin case below
+    PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
+    PGO_PROF_USE_FLAG="-fprofile-instr-use=code.profclangd"
+    LLVM_PROF_MERGER="llvm-profdata merge -output=code.profclangd *.profclangr"
+    LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"code-%p.profclangr\""
+    if test $LLVM_PROF_FOUND = not-found
+    then
+      LLVM_PROF_ERR=yes
+    fi
+    ;;
+  *gcc*)
+    case $ac_sys_system in
+      Darwin*)
+        PGO_PROF_GEN_FLAG="-fprofile-instr-generate"
+        PGO_PROF_USE_FLAG="-fprofile-instr-use=code.profclangd"
+        LLVM_PROF_MERGER="llvm-profdata merge -output=code.profclangd *.profclangr"
+        LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"code-%p.profclangr\""
+        if test $LLVM_PROF_FOUND = not-found
+        then
+          LLVM_PROF_ERR=yes
+        fi
+        ;;
+      *)
+        PGO_PROF_GEN_FLAG="-fprofile-generate"
+        PGO_PROF_USE_FLAG="-fprofile-use -fprofile-correction"
+        LLVM_PROF_MERGER="true"
+        LLVM_PROF_FILE=""
+        ;;
+    esac
+    ;;
+esac
+
+
 # On some compilers, pthreads are available without further options
 # (e.g. MacOS X). On some of these systems, the compiler will not
 # complain if unaccepted options are passed (e.g. gcc on Mac OS X).