buildroot/package/audiofile/0001-Fix-pkg-config-for-static-linking.patch

From 2abf7d2e5c533bf4d7407c2c8057a329cd49a3cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
Date: Tue, 24 Nov 2015 21:57:27 +0100
Subject: [PATCH 1/1] Fix pkg-config for static linking
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Static linking userspace programs such as MPD against libaudiofile fails if
FLAC is available, because libaudiofile is linked against FLAC, but this isn't
expressed in the pkg-config file:

[..]
arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libaudiofile.a(FLAC.o): In function `FLACDecoder::reset2()':
FLAC.cpp:(.text+0x58): undefined reference to `FLAC__stream_decoder_seek_absolute'
/home/buildroot/build/instance-1/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libaudiofile.a(FLAC.o): In function `FLACEncoder::sync2()':
FLAC.cpp:(.text+0x88): undefined reference to `FLAC__stream_encoder_finish'
/home/buildroot/build/instance-1/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libaudiofile.a(FLAC.o): In function `FLACDecoder::~FLACDecoder()':
FLAC.cpp:(.text+0xc4): undefined reference to `FLAC__stream_decoder_delete'
/home/buildroot/build/instance-1/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libaudiofile.a(FLAC.o): In function `FLACEncoder::~FLACEncoder()':
FLAC.cpp:(.text+0x164): undefined reference to `FLAC__stream_encoder_delete'
/home/buildroot/build/instance-1/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libaudiofile.a(FLAC.o): In function `FLACDecoder::runPull()':
[..]

The Libs.private field is specifically designed for such usage:

From pkg-config documentation:

  Libs.private:

     This line should list any private libraries in use.  Private
     libraries are libraries which are not exposed through your
     library, but are needed in the case of static linking.

Therefore, this patch adds a reference to FLAC as well as to lcov in the
Libs.private field of the pkg-config file.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
---
 audiofile.pc.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/audiofile.pc.in b/audiofile.pc.in
index ad5956a..d6055ef 100644
--- a/audiofile.pc.in
+++ b/audiofile.pc.in
@@ -8,5 +8,5 @@ Description: audiofile
 Requires:
 Version: @VERSION@
 Libs: -L${libdir} -laudiofile
-Libs.private: -lm
+Libs.private: @FLAC_LIBS@ @COVERAGE_LIBS@ -lm
 Cflags: -I${includedir}
-- 
2.6.2