[Buildroot] [PATCH 1/2] package/pkg-golang: allow packages to provide extldflags

[yann.morin at orange.com]

From: "Yann E. MORIN" <yann.morin at orange.com>

For some packages, it may be necessary to pass extra extldflags. For
example, some packages will need to be able to specify what ld to use,
and so will need to pass -fuse-ld={bfd,gold} as extldflags.

Introduce FOO_EXTLDFLAGS, that packages can set to pass such flags.

Signed-off-by: Yann E. MORIN <yann.morin at orange.com>
---
 docs/manual/adding-packages-golang.adoc | 6 ++++--
 package/pkg-golang.mk                   | 6 +++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/docs/manual/adding-packages-golang.adoc b/docs/manual/adding-packages-golang.adoc
index c952cde577..c238050096 100644
--- a/docs/manual/adding-packages-golang.adoc
+++ b/docs/manual/adding-packages-golang.adoc
@@ -84,8 +84,10 @@ therefore only use a few of them, or none.
   infrastructure will automatically generate a minimal +go.mod+ file
   in the package source tree if it doesn't exist.
 
-* +FOO_LDFLAGS+ and +FOO_TAGS+ can be used to pass respectively the
-  +LDFLAGS+ or the +TAGS+ to the +go+ build command.
+* +FOO_LDFLAGS+, +FOO_EXTLDFLAGS+, and +FOO_TAGS+ can be used to pass
+  respectively the go +LDFLAGS+ (via the `-ldflags` command line flag),
+  the external linker flags +EXTLDFLAGS+ (via the `-extldflags`
+  command line flag), or the +TAGS+ to the +go+ build command.
 
 * +FOO_BUILD_TARGETS+ can be used to pass the list of targets that
   should be built. If +FOO_BUILD_TARGETS+ is not specified, it
diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
index 7ba82284f3..ba49ce153e 100644
--- a/package/pkg-golang.mk
+++ b/package/pkg-golang.mk
@@ -101,10 +101,14 @@ ifndef $(2)_BUILD_CMDS
 ifeq ($(4),target)
 
 ifeq ($(BR2_STATIC_LIBS),y)
-$(2)_LDFLAGS += -extldflags '-static'
+$(2)_EXTLDFLAGS += -static
 $(2)_TAGS += osusergo netgo
 endif
 
+ifneq ($$($(2)_EXTLDFLAGS),)
+$(2)_LDFLAGS += -extldflags '$$($(2)_EXTLDFLAGS)'
+endif
+
 # Build package for target
 define $(2)_BUILD_CMDS
 	$$(foreach d,$$($(2)_BUILD_TARGETS),\
-- 
2.34.1

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