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configure: correctly detect libssl using pkg-config

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This allows the openssl version to be easily overridden using standard
PKG_CONFIG_PATH overrides, which is required for modern distros that use
openssl 1.1 by default.

Also print diagnostics for the libssl flavor in use, and constrain the
version when using openssl to < 1.1.
This commit is contained in:
Eli Schwartz 2017-12-26 09:28:16 -05:00
parent 498d542588
commit 861617a708
No known key found for this signature in database
GPG Key ID: CEB167EFB5722BD6
1 changed files with 12 additions and 34 deletions
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44
configure vendored
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@ -675,43 +675,21 @@ else
fi
#
# OpenSSL libssl with pkg-config support is required when building
# the static binaries.
# libssl with pkg-config support is required.
#
if [ "$BUILD_STATIC" = "yes" ]; then
printf "Checking for OpenSSL via pkg-config ... "
if ! $PKGCONFIG_BIN --exists libssl; then
echo "libssl.pc file not found, exiting."
exit 1
else
echo "found version $($PKGCONFIG_BIN --modversion libssl)."
echo "CFLAGS += $($PKGCONFIG_BIN --cflags libssl)" >>$CONFIG_MK
echo "LDFLAGS += $($PKGCONFIG_BIN --libs libssl)" >>$CONFIG_MK
echo "STATIC_LIBS += $($PKGCONFIG_BIN --libs --static libssl)" \
>>$CONFIG_MK
fi
printf "Checking for libssl via pkg-config ... "
if $PKGCONFIG_BIN --exists 'libssl < 1.1' && ! $PKGCONFIG_BIN --exists libtls ; then
echo "found OpenSSL version $($PKGCONFIG_BIN --modversion libssl)."
elif $PKGCONFIG_BIN --exists libssl libtls; then
echo "found LibreSSL version $($PKGCONFIG_BIN --modversion libssl)."
else
func=SHA256
printf "Checking for OpenSSL $func() ... "
cat <<EOF > _$func.c
#include <openssl/sha.h>
int main(void) {
SHA256(NULL, NULL, 0);
return 0;
}
EOF
if $XCC _$func.c -lcrypto -o _$func 2>/dev/null; then
echo yes.
echo "LDFLAGS += -lcrypto" >>$CONFIG_MK
else
CRYPTO_SHA256=no
fi
rm -f _$func.c _$func
if [ "$CRYPTO_SHA256" = "no" ]; then
echo "Failed to link with your system's OpenSSL library, can't continue..."
echo "libssl.pc file not found or incompatible version detected, exiting."
exit 1
fi
fi
echo "CFLAGS += $($PKGCONFIG_BIN --cflags libssl)" >>$CONFIG_MK
echo "LDFLAGS += $($PKGCONFIG_BIN --libs libssl)" >>$CONFIG_MK
echo "STATIC_LIBS += $($PKGCONFIG_BIN --libs --static libssl)" \
>>$CONFIG_MK
#
# If --enable-static enabled, build static binaries.