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build: pass win32-dll to LT_INIT()
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This is the recommended way to support building PE DLLs with modern mingw 
toolchains and libtool. I made a similar change upstream in the secp256k1 
repo: bitcoin-core/secp256k1#1022. Note that we already
pass `-no-undefined` to our libtool LDFLAGS.

> This option should be used if the package has been ported to build clean
> dlls on win32 platforms.
> If this macro is not used, libtool will assume that the package libraries
> are not dll clean and will build only static libraries on win32 hosts.

See:
https://www.gnu.org/software/libtool/manual/libtool.html#LT_005fINIT
https://www.gnu.org/software/gnulib/manual/html_node/Libtool-and-Windows.html
https://autotools.io/libtool/windows.html
bitcoin-core/secp256k1#923
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fanquake authored and janus committed Jul 21, 2022
1 parent c070cba commit b19b245
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion configure.ac
Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,7 @@ dnl sets RPATH for any directories in the dynamic linker search path.
dnl See more: https://wiki.debian.org/RpathIssue
LT_PREREQ([1.5.2])
dnl Libtool init checks.
LT_INIT([pic-only])
LT_INIT([pic-only win32-dll])

dnl Check/return PATH for base programs.
AC_PATH_TOOL([AR], [ar])
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