makepkg: add rust support for *FLAGS and debug-prefix-map

The rust language supports $RUSTFLAGS to be used automatically in all
rustc invocations. Allow setting this in makepkg.conf (e.g. for
optimization or debuginfo support), and teach debug+strip to pass the
rustc command line argument necessary to rewrite source file paths in
the debugging symbols.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

6 files changed, 19 insertions, 6 deletions

diff --git a/doc/makepkg.conf.5.asciidoc b/doc/makepkg.conf.5.asciidoc
index 178a1f1c..b7496324 100644
--- a/doc/makepkg.conf.5.asciidoc
+++ b/doc/makepkg.conf.5.asciidoc
@@ -72,6 +72,10 @@ Options
 **CXXFLAGS=**"cxxflags"::
 	Flags used for the C++ compiler; see CFLAGS for more info.
 
+**RUSTFLAGS=**"rustflags"::
+	Flags used for the Rust compiler, similar in spirit to CFLAGS. Read
+	linkman:rustc[1] for more details on the available flags.
+
 **LDFLAGS=**"ldflags"::
 	Flags used for the linker. Several options may be specified with common
 	usage resembling ``-Wl,--hash-style=gnu''. Read ld(1) for more details on
@@ -89,6 +93,11 @@ Options
 **DEBUG_CXXFLAGS=**"debug_cxxflags"::
 	Debug flags used for the C++ compiler; see DEBUG_CFLAGS for more info.
 
+**DEBUG_RUSTFLAGS=**"debug_rustflags"::
+	Additional compiler flags appended to `RUSTFLAGS` for use in debugging.
+	Usually this would include: ``-C debuginfo=2''. Read linkman:rustc[1] for
+	more details on the available flags.
+
 **BUILDENV=(**!distcc !color !ccache check !sign**)**::
 	This array contains options that affect the build environment; the defaults
 	are shown here. All options should always be left in the array; to enable
diff --git a/etc/makepkg.conf.in b/etc/makepkg.conf.in
index 7e5da993..caf5114b 100644
--- a/etc/makepkg.conf.in
+++ b/etc/makepkg.conf.in
@@ -40,11 +40,13 @@ CHOST="@CHOST@"
 #CFLAGS="-O2 -pipe"
 #CXXFLAGS="-O2 -pipe"
 #LDFLAGS=""
+#RUSTFLAGS="-C opt-level=2"
 #-- Make Flags: change this for DistCC/SMP systems
 #MAKEFLAGS="-j2"
 #-- Debugging flags
 #DEBUG_CFLAGS="-g"
 #DEBUG_CXXFLAGS="-g"
+#DEBUG_RUSTFLAGS="-C debuginfo=2"
 
 #########################################################################
 # BUILD ENVIRONMENT
diff --git a/scripts/libmakepkg/buildenv.sh.in b/scripts/libmakepkg/buildenv.sh.in
index 085e1380..48c95313 100644
--- a/scripts/libmakepkg/buildenv.sh.in
+++ b/scripts/libmakepkg/buildenv.sh.in
@@ -36,5 +36,5 @@ prepare_buildenv() {
 	done
 
 	# ensure all necessary build variables are exported
-	export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS MAKEFLAGS CHOST
+	export CPPFLAGS CFLAGS CXXFLAGS LDFLAGS RUSTFLAGS MAKEFLAGS CHOST
 }
diff --git a/scripts/libmakepkg/buildenv/buildflags.sh.in b/scripts/libmakepkg/buildenv/buildflags.sh.in
index daccc9cc..85ee80fc 100644
--- a/scripts/libmakepkg/buildenv/buildflags.sh.in
+++ b/scripts/libmakepkg/buildenv/buildflags.sh.in
@@ -30,6 +30,6 @@ buildenv_functions+=('buildenv_buildflags')
 
 buildenv_buildflags() {
 	if check_option "buildflags" "n"; then
-		unset CPPFLAGS CFLAGS DEBUG_CFLAGS CXXFLAGS DEBUG_CXXFLAGS LDFLAGS
+		unset CPPFLAGS CFLAGS DEBUG_CFLAGS CXXFLAGS DEBUG_CXXFLAGS LDFLAGS RUSTFLAGS DEBUG_RUSTFLAGS
 	fi
 }
diff --git a/scripts/libmakepkg/buildenv/debugflags.sh.in b/scripts/libmakepkg/buildenv/debugflags.sh.in
index ce9c1556..4cd5d003 100644
--- a/scripts/libmakepkg/buildenv/debugflags.sh.in
+++ b/scripts/libmakepkg/buildenv/debugflags.sh.in
@@ -32,7 +32,9 @@ buildenv_debugflags() {
 	if check_option "debug" "y"; then
 		DEBUG_CFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
 		DEBUG_CXXFLAGS+=" -fdebug-prefix-map=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
+		DEBUG_RUSTFLAGS+=" --remap-path-prefix=$srcdir=${DBGSRCDIR:-/usr/src/debug}"
 		CFLAGS+=" $DEBUG_CFLAGS"
 		CXXFLAGS+=" $DEBUG_CXXFLAGS"
+		RUSTFLAGS+=" $DEBUG_RUSTFLAGS"
 	fi
 }
diff --git a/scripts/libmakepkg/lint_config/variable.sh.in b/scripts/libmakepkg/lint_config/variable.sh.in
index b0b731dd..aa9f6c07 100644
--- a/scripts/libmakepkg/lint_config/variable.sh.in
+++ b/scripts/libmakepkg/lint_config/variable.sh.in
@@ -32,10 +32,10 @@ lint_config_variables() {
 	local array=(DLAGENTS VCSCLIENTS BUILDENV OPTIONS INTEGRITY_CHECK MAN_DIRS
 	             DOC_DIRS PURGE_TARGETS COMPRESSGZ COMPRESSBZ2 COMPRESSXZ
 	             COMPRESSLRZ COMPRESSLZO COMPRESSZ)
-	local string=(CARCH CHOST CPPFLAGS CFLAGS CXXFLAGS LDFLAGS DEBUG_CFLAGS
-	              DEBUG_CXXFLAGS DISTCC_HOSTS BUILDDIR STRIP_BINARIES STRIP_SHARED
-	              STRIP_STATIC PKGDEST SRCDEST SRCPKGDEST LOGDEST PACKAGER GPGKEY
-	              PKGEXT SRCEXT)
+	local string=(CARCH CHOST CPPFLAGS CFLAGS CXXFLAGS RUSTFLAGS LDFLAGS DEBUG_CFLAGS
+	              DEBUG_CXXFLAGS DEBUG_RUSTFLAGS DISTCC_HOSTS BUILDDIR STRIP_BINARIES
+	              STRIP_SHARED STRIP_STATIC PKGDEST SRCDEST SRCPKGDEST LOGDEST PACKAGER
+	              GPGKEY PKGEXT SRCEXT)
 
 	local i keys ret=0