[PATCH v2 2/2] build: initial pkg-config support

[Nick Alcock <nick.alcock@oracle.com>]

This initial pkg-config file, dtrace_sdt.pc, points at the location
of the sdt.h include file.  We immediately use it in make check in the
installed testsuite, compensating for any install-time changes in the
location of the dtrace libdir.

Further changes will be forthcoming to properly support relocatable
installation.

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
---
 GNUmakefile          |  2 ++
 configure            |  2 ++
 dtrace.spec          |  1 +
 runtest.sh           |  2 +-
 uts/Build            | 14 +++++++++++++-
 uts/dtrace_sdt.pc.in |  6 ++++++
 6 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 uts/dtrace_sdt.pc.in

diff --git a/GNUmakefile b/GNUmakefile
index 30726332d762d..0390db77b4780 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -100,6 +100,8 @@ DOCDIR = $(prefix)/share/doc/dtrace-$(VERSION)
 INSTDOCDIR = $(DESTDIR)$(DOCDIR)
 MANDIR = $(prefix)/share/man/man8
 INSTMANDIR = $(DESTDIR)$(MANDIR)
+PKGCONFIGDIR = $(prefix)/share/pkgconfig
+INSTPKGCONFIGDIR = $(DESTDIR)$(PKGCONFIGDIR)
 TESTDIR = $(prefix)/lib$(BITNESS)/dtrace/testsuite
 INSTTESTDIR = $(DESTDIR)$(TESTDIR)
 TARGETS =
diff --git a/configure b/configure
index 40b870f81d6ff..4b235fb1fd766 100755
--- a/configure
+++ b/configure
@@ -60,6 +60,7 @@ Installation paths:
 --sbindir=PREFIX/sbin				Alias for --bindir
 --includedir=PREFIX/include			#include directory
 --mandir=PREFIX/share/man/man8			Manpage directory
+--pkg-config-dir=PREFIX/share/pkgconfig		Pkg-config directory
 --udevdir=PREFIX/lib/udev/rules.d		udev rules directory
 --systemd-unit-dir=PREFIX/lib/systemd/system	systemd unit directory
 --docdir=PREFIX/share/doc/dtrace		Documentation directory
@@ -130,6 +131,7 @@ for option in "$@"; do
         --systemd-unit-dir=*) write_make_var SYSTEMDUNITDIR "$option";;
         --docdir=*) write_make_var DOCDIR "$option";;
         --mandir=*) write_make_var MANDIR "$option";;
+        --pkg-config-dir=*) write_make_var PKGCONFIGDIR "$option";;
         --testdir=*) write_make_var TESTDIR "$option";;
         CC=*) write_make_var CC "$option";;
         CPP=*) write_make_var PREPROCESS "$option";;
diff --git a/dtrace.spec b/dtrace.spec
index 2f1e489aab7b1..7823b13d981cf 100644
--- a/dtrace.spec
+++ b/dtrace.spec
@@ -236,6 +236,7 @@ systemctl start dtprobed || :
 %{_libdir}/libdtrace.so.*
 %{_sbindir}/dtrace
 %{_sbindir}/dtprobed
+%{_datadir}/pkgconfig/dtrace_sdt.pc
 %{_mandir}/man8/dtrace.8.gz
 %doc %{_docdir}/dtrace-%{version}/*
 %{_unitdir}/dtprobed.service
diff --git a/runtest.sh b/runtest.sh
index 3bcd676ea788d..cc9703e12c161 100755
--- a/runtest.sh
+++ b/runtest.sh
@@ -579,7 +579,7 @@ else
     dtrace="/usr/sbin/dtrace"
     test_libdir="installed"
     test_ldflags=""
-    test_cppflags="-DARCH_$arch -I/usr/lib64/dtrace/include"
+    test_cppflags="-DARCH_$arch $(pkg-config --cflags dtrace_sdt)"
 
     if [[ ! -x $dtrace ]]; then
         echo "$dtrace not available." >&2
diff --git a/uts/Build b/uts/Build
index 864b2dfdacbf4..feafa21369f2e 100644
--- a/uts/Build
+++ b/uts/Build
@@ -14,11 +14,16 @@ SYS_HEADERS_INSTALL := common/sys/dtrace.h \
 
 # sdt*.h are used by programs that contain USDT probes that want to define
 # probes by hand rather than using dtrace -h.  SystemTap has another header
-# with the same name, so we install these out of the way.
+# with the same name, so we install these out of the way and provide a
+# pkg-config file to pull them in.
 
 PROBE_HEADERS_INSTALL := common/sys/sdt.h \
                          common/sys/sdt_internal.h
 
+# The pkg-config files undergo a few translations with sed before installation.
+
+SHARE_PKG_CONFIG_INSTALL := dtrace_sdt.pc
+
 install::
 	mkdir -p $(INSTINCLUDEDIR)/sys
 	$(call describe-install-target,$(INSTINCLUDEDIR)/sys,$(notdir $(SYS_HEADERS_INSTALL)))
@@ -26,3 +31,10 @@ install::
 	mkdir -p $(INSTSDTINCLUDEDIR)/sys
 	$(call describe-install-target,$(INSTSDTINCLUDEDIR)/sys,$(notdir $(PROBE_HEADERS_INSTALL)))
 	cd $(uts_DIR) && install -m 644 $(PROBE_HEADERS_INSTALL) $(INSTSDTINCLUDEDIR)/sys
+	mkdir -p $(INSTPKGCONFIGDIR)
+	$(call describe-install-target,$(INSTPKGCONFIGDIR),$(SHARE_PKG_CONFIG_INSTALL))
+	for name in $(SHARE_PKG_CONFIG_INSTALL); do \
+		cd $(uts_DIR) && \
+		    sed 's,@SDTINCLUDEDIR@,$(SDTINCLUDEDIR),g; s,@VERSION@,$(VERSION),g' < \
+			$${name}.in > $(INSTPKGCONFIGDIR)/$$name; \
+	done
diff --git a/uts/dtrace_sdt.pc.in b/uts/dtrace_sdt.pc.in
new file mode 100644
index 0000000000000..c5506f9355d92
--- /dev/null
+++ b/uts/dtrace_sdt.pc.in
@@ -0,0 +1,6 @@
+sdtincludedir = @SDTINCLUDEDIR@
+
+Name: DTrace SDT
+Description: DTrace raw SDT headers
+Version: @VERSION@
+Cflags: -I${sdtincludedir}
-- 
2.45.1.275.g567cb0950c