[Patch v2 2/4] build/ruby: make use of -Wl,--no-undefined configurable

diff --git a/b0/7e4d4b70463511c20e293795127663877c0244 b/b0/7e4d4b70463511c20e293795127663877c0244
new file mode 100644 (file)
index 0000000..6746fe2
--- /dev/null
+++ b/b0/7e4d4b70463511c20e293795127663877c0244
@@ -0,0 +1,124 @@
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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v2 2/4] build/ruby: make use of -Wl,--no-undefined\r
+ configurable\r
+Date: Fri,  6 Mar 2015 22:57:51 +0100\r
+Message-Id: <1425679073-30439-3-git-send-email-david@tethera.net>\r
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+\r
+In particular this is supposed to help build on systems (presumably\r
+using a non-gnu ld) where this flag is not available.\r
+---\r
+ bindings/Makefile.local  |  4 +++-\r
+ bindings/ruby/extconf.rb |  5 +++--\r
+ configure                | 13 +++++++++++++\r
+ 3 files changed, 19 insertions(+), 3 deletions(-)\r
+\r
+diff --git a/bindings/Makefile.local b/bindings/Makefile.local\r
+index 6ed1344..210055f 100644\r
+--- a/bindings/Makefile.local\r
++++ b/bindings/Makefile.local\r
+@@ -5,7 +5,9 @@ dir := bindings\r
+ # force the shared library to be build\r
+ ruby-bindings: lib/libnotmuch.so\r
+ ifeq ($(HAVE_RUBY_DEV),1)\r
+-      cd $(dir)/ruby && ruby extconf.rb --vendor\r
++      cd $(dir)/ruby && \\r
++              EXTRA_LDFLAGS="$(NO_UNDEFINED_LDFLAGS)" \\r
++              ruby extconf.rb --vendor\r
+       $(MAKE) -C $(dir)/ruby\r
+ else\r
+       @echo Missing dependency, skipping ruby bindings\r
+diff --git a/bindings/ruby/extconf.rb b/bindings/ruby/extconf.rb\r
+index 6160db2..6d5607e 100644\r
+--- a/bindings/ruby/extconf.rb\r
++++ b/bindings/ruby/extconf.rb\r
+@@ -10,8 +10,9 @@ dir = File.join('..', '..', 'lib')\r
+ # includes\r
+ $INCFLAGS = "-I#{dir} #{$INCFLAGS}"\r
+ \r
+-# make sure there are no undefined symbols\r
+-$LDFLAGS += ' -Wl,--no-undefined'\r
++if ENV['EXTRA_LDFLAGS']\r
++  $LDFLAGS += " " + ENV['EXTRA_LDFLAGS']\r
++end\r
+ \r
+ def have_local_library(lib, path, func, headers = nil)\r
+   checking_for checking_message(func, lib) do\r
+diff --git a/configure b/configure\r
+index 3ca9bed..409bb60 100755\r
+--- a/configure\r
++++ b/configure\r
+@@ -722,6 +722,16 @@ else\r
+     as_needed_ldflags=""\r
+ fi\r
+ \r
++printf "Checking for -Wl,--no-undefined... "\r
++if ${CC} -Wl,--no-undefined -o minimal minimal.c >/dev/null 2>&1\r
++then\r
++    printf "Yes.\n"\r
++    no_undefined_ldflags="-Wl,--no-undefined"\r
++else\r
++    printf "No (nothing to worry about).\n"\r
++    no_undefined_ldflags=""\r
++fi\r
++\r
+ WARN_CXXFLAGS=""\r
+ printf "Checking for available C++ compiler warning flags... "\r
+ for flag in -Wall -Wextra -Wwrite-strings; do\r
+@@ -926,6 +936,9 @@ RPATH_LDFLAGS = ${rpath_ldflags}\r
+ # Flags needed to have linker link only to necessary libraries\r
+ AS_NEEDED_LDFLAGS = ${as_needed_ldflags}\r
+ \r
++# Flags to have the linker flag undefined symbols in object files\r
++NO_UNDEFINED_LDFLAGS = ${no_undefined_ldflags}\r
++\r
+ # Whether valgrind header files are available\r
+ HAVE_VALGRIND = ${have_valgrind}\r
+ \r
+-- \r
+2.1.4\r
+\r