From 910dafbb85952815e4b8f36f86ecae0050f36b9f Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Tue, 24 Nov 2020 11:04:19 -0800
Subject: [PATCH] configure: Improve profile build related.

---
 configure.ac          | 39 ++++++++++++++++++++++++++++++++-------
 construct/Makefile.am |  6 ++++++
 ircd/Makefile.am      | 27 +++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index 84923902a..c93ae7a75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -381,30 +381,54 @@ dnl
 dnl Profiling mode
 dnl
 
-AC_MSG_CHECKING(whether to do a profile build)
-AC_ARG_ENABLE(profile, RB_HELP_STRING([--enable-profile], [Enable profiling]),
+AC_MSG_CHECKING(whether to instrument build for runtime profile generation)
+AC_ARG_ENABLE(profile, RB_HELP_STRING([--enable-profile], [Generate profile at runtime]),
 [
 	profiling="yes"
+	AC_DEFINE(CHARYBDIS_PROFILE, 1, [Define this if you are profiling.])
+
 	AM_COND_IF(GCC,
 	[
 		AC_MSG_RESULT([yes, adding -pg])
 		RB_VAR_PREPEND([CXXFLAGS], ["-pg"])
-		AC_DEFINE(CHARYBDIS_PROFILE, 1, [Define this if you are profiling.])
 	])
 
 	AM_COND_IF(CLANG,
 	[
 		AC_MSG_RESULT([yes, adding profiling flags])
-		RB_VAR_PREPEND([CXXFLAGS], ["-fprofile-instr-generate"])
-		RB_VAR_PREPEND([CXXFLAGS], ["-fcoverage-mapping"])
-		RB_VAR_PREPEND([LDFLAGS], ["-fprofile-instr-generate"])
-		AC_DEFINE(CHARYBDIS_PROFILE, 1, [Define this if you are profiling.])
+
+		#RB_VAR_PREPEND([CXXFLAGS], ["-fprofile-generate"])
+		#RB_VAR_PREPEND([LDFLAGS], ["-Wl,-fprofile-generate"])
+
+		dnl TODO: $enableval=instr?
+		dnl RB_VAR_PREPEND([CXXFLAGS], ["-fprofile-instr-generate"])
+		dnl RB_VAR_PREPEND([CXXFLAGS], ["-fcoverage-mapping"])
+		dnl RB_VAR_PREPEND([LDFLAGS], ["-Wl,-fprofile-instr-generate"])
 	])
+
 ], [
 	AC_MSG_RESULT([no])
 	profiling="no"
 ])
 
+AC_MSG_CHECKING(whether to use a specific runtime profile)
+AC_ARG_WITH(profile, RB_HELP_STRING([--with-profile[[[=$PWD]]]], [Path to profdata]),
+[
+	profiling_use=$withval
+	AC_MSG_RESULT([yes, "$profiling_use"])
+	AC_SUBST(PROFILE_USE, $profiling_use)
+
+dnl	AM_COND_IF(CLANG,
+dnl	[
+dnl		RB_VAR_PREPEND([CXXFLAGS], [-fprofile-use="$profiling_use"])
+dnl	])
+
+], [
+	AC_MSG_RESULT([no])
+])
+
+AM_CONDITIONAL([PROFILE], [[[[ "$profiling" = "yes" ]]]])
+
 dnl
 dnl Precompiled headers
 dnl
@@ -2593,6 +2617,7 @@ echo "Developer profiling ............... $profiling"
 echo "Precompiled headers ............... $build_pch"
 echo "Optimized compile ................. $optimize"
 echo "Optimized linking ................. $lto"
+echo "Optimized runtime ................. $profiling_used"
 echo "Optimization level ................ $optimize_level"
 echo "Machine tuned ..................... $machine_tuning"
 echo
diff --git a/construct/Makefile.am b/construct/Makefile.am
index 2db4f8da0..e94fec890 100644
--- a/construct/Makefile.am
+++ b/construct/Makefile.am
@@ -36,6 +36,12 @@ AM_LDFLAGS = \
 	$(EXTRA_LDFLAGS) \
 	###
 
+if PROFILE
+if CLANG
+AM_CXXFLAGS += -fprofile-generate
+endif
+endif
+
 bin_PROGRAMS = construct
 
 construct_LDFLAGS = \
diff --git a/ircd/Makefile.am b/ircd/Makefile.am
index 38cbcdcf7..232a15ec2 100644
--- a/ircd/Makefile.am
+++ b/ircd/Makefile.am
@@ -61,6 +61,18 @@ AM_LDFLAGS += -Wl,--enable-runtime-pseudo-reloc
 AM_LDFLAGS += -export-symbols-regex '*'
 endif
 
+if PROFILE
+if CLANG
+AM_CXXFLAGS += -fprofile-generate
+AM_LDFLAGS += -Wl,-fprofile-generate
+#TODO: XXX
+#AM_CXXFLAGS += -fprofile-instr-generate
+#AM_CXXFLAGS += -fcoverage-mapping
+#AM_LDFLAGS += -Wl,-fprofile-instr-generate
+#AM_LDFLAGS += -Wl,-fcoverage-mapping
+endif
+endif
+
 #
 # libircd
 #
@@ -108,6 +120,13 @@ libircd_la_LIBADD = \
 	$(EXTRA_LIBS) \
 	###
 
+if PROFILE
+if CLANG11
+#TODO: XXX
+libircd_la_LIBADD += /usr/lib/llvm-11/lib/clang/11.0.0/lib/linux/libclang_rt.profile-x86_64.a
+endif
+endif
+
 #
 # Unit list
 #
@@ -221,6 +240,14 @@ libircd_la_SOURCES += ircd.cc
 # Specific unit configurations
 #
 
+if CLANG
+if !PROFILE
+if !DEBUG
+SPIRIT_UNIT_CXXFLAGS += -fprofile-use
+endif
+endif
+endif
+
 client.lo:            AM_CPPFLAGS := ${ASIO_UNIT_CPPFLAGS} ${AM_CPPFLAGS}
 ctx_x86_64.lo:        AM_CPPFLAGS := -I$(top_srcdir)/include
 ctx.lo:               AM_CPPFLAGS := ${ASIO_UNIT_CPPFLAGS} ${AM_CPPFLAGS}