bpo-36721: Add --embed option to python-config (GH-13500)

To embed Python into an application, a new --embed option must be
passed to "python3-config --libs --embed" to get "-lpython3.8" (link
the application to libpython). To support both 3.8 and older, try
"python3-config --libs --embed" first and fallback to "python3-config
--libs" (without --embed) if the previous command fails.

Add a pkg-config "python-3.8-embed" module to embed Python into an
application: "pkg-config python-3.8-embed --libs" includes
"-lpython3.8".  To support both 3.8 and older, try "pkg-config
python-X.Y-embed --libs" first and fallback to "pkg-config python-X.Y
--libs" (without --embed) if the previous command fails (replace
"X.Y" with the Python version).

On the other hand, "pkg-config python3.8 --libs" no longer contains
"-lpython3.8". C extensions must not be linked to libpython (except
on Android, case handled by the script); this change is backward
incompatible on purpose.

"make install" now also installs "python-3.8-embed.pc".

1 files changed, 2 insertions, 1 deletions

diff --git a/configure b/configure
index a0767b9..72889b9 100755
--- a/configure
+++ b/configure
@@ -17315,7 +17315,7 @@ fi
 
 
 # generate output files
-ac_config_files="$ac_config_files Makefile.pre Misc/python.pc Misc/python-config.sh"
+ac_config_files="$ac_config_files Makefile.pre Misc/python.pc Misc/python-embed.pc Misc/python-config.sh"
 
 ac_config_files="$ac_config_files Modules/ld_so_aix"
 
@@ -18018,6 +18018,7 @@ do
     "Mac/Resources/app/Info.plist") CONFIG_FILES="$CONFIG_FILES Mac/Resources/app/Info.plist" ;;
     "Makefile.pre") CONFIG_FILES="$CONFIG_FILES Makefile.pre" ;;
     "Misc/python.pc") CONFIG_FILES="$CONFIG_FILES Misc/python.pc" ;;
+    "Misc/python-embed.pc") CONFIG_FILES="$CONFIG_FILES Misc/python-embed.pc" ;;
     "Misc/python-config.sh") CONFIG_FILES="$CONFIG_FILES Misc/python-config.sh" ;;
     "Modules/ld_so_aix") CONFIG_FILES="$CONFIG_FILES Modules/ld_so_aix" ;;