autotools: accept linker flags via `CURL_LDFLAGS_{LIB,BIN}`

To allow passing `LDFLAGS` specific to libcurl (`CURL_LDFLAGS_LIB`) and
curl tool (`CURL_LDFLAGS_BIN`).

This makes it possible to build libcurl and curl with a single
invocation with lib- and tool-specific custom linker flags.

Such flag can be enabling `.map` files, a `.def` file for libcurl DLL,
controlling static/shared, incl. requesting a static curl tool (with
`-static-libtool-libs`) while building both shared and static libcurl.

curl-for-win uses the above and some more.

These options are already supported in `Makefile.mk`. CMake has built-in
variables for this.

Closes #12312

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 3c0a709127dc1b1d4a8038628db9a7442a034337..cae1deceb01fdb64de2f90ecf1c47da3da114a76 100644 (file)
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -110,7 +110,7 @@ libcurl_la_CFLAGS_EXTRA += $(CFLAG_CURL_SYMBOL_HIDING)
 endif
 
 libcurl_la_CPPFLAGS = $(AM_CPPFLAGS) $(libcurl_la_CPPFLAGS_EXTRA)
-libcurl_la_LDFLAGS = $(AM_LDFLAGS) $(libcurl_la_LDFLAGS_EXTRA) $(LDFLAGS) $(LIBCURL_LIBS)
+libcurl_la_LDFLAGS = $(AM_LDFLAGS) $(libcurl_la_LDFLAGS_EXTRA) $(LDFLAGS) $(CURL_LDFLAGS_LIB) $(LIBCURL_LIBS)
 libcurl_la_CFLAGS = $(AM_CFLAGS) $(libcurl_la_CFLAGS_EXTRA)
 
 libcurlu_la_CPPFLAGS = $(AM_CPPFLAGS) -DCURL_STATICLIB -DUNITTESTS

diff --git a/src/Makefile.am b/src/Makefile.am
index b22ece613fa24c68876232f863575a0c9b288299..dced53e0f9861dac318f9e539b15ed3218c19b3a 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -61,6 +61,8 @@ curl_SOURCES += $(CURL_RCFILES)
 $(CURL_RCFILES): tool_version.h
 endif
 
+curl_LDFLAGS = $(AM_LDFLAGS) $(CURL_LDFLAGS_BIN)
+
 # This might hold -Werror
 CFLAGS += @CURL_CFLAG_EXTRAS@